:root{
  color-scheme:dark light;
  --bg:#09090B;--surface-1:#111113;--surface-2:#17171A;--surface-3:#202024;
  --text-primary:#F4F4F5;--text-secondary:#A1A1AA;--text-muted:#71717A;
  --border:rgba(255,255,255,.08);--border-hover:rgba(255,255,255,.14);
  --accent:#7C6CF2;--success:#42B883;--warning:#E6A23C;--danger:#E85D68;
  --space-1:4px;--space-2:8px;--space-3:12px;--space-4:16px;--space-5:20px;--space-6:24px;--space-8:32px;--space-10:40px;--space-12:48px;--space-14:56px;
  --radius-sm:10px;--radius-md:14px;--radius-lg:18px;--radius-xl:22px;--radius-sheet:28px;
  --tap-min:44px;--button-height:52px;--page-padding:18px;--content-max:720px;--nav-height:64px;--header-height:56px;
  --text-xs:13px;--text-sm:14px;--text-base:17px;--text-lg:21px;--text-xl:26px;--text-2xl:32px;--text-hero:clamp(42px,11vw,48px);
}
:root[data-theme="light"]{--bg:#F7F7F8;--surface-1:#FFFFFF;--surface-2:#F1F1F3;--surface-3:#E8E8EB;--text-primary:#18181B;--text-secondary:#606068;--text-muted:#7C7C85;--border:rgba(0,0,0,.08);--border-hover:rgba(0,0,0,.14)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;overflow-x:hidden;background:var(--bg);color:var(--text-primary);font-family:-apple-system,BlinkMacSystemFont,"SF Pro Text","SF Pro Display",system-ui,sans-serif;font-size:var(--text-base);line-height:1.68;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button,input,select{font:inherit}.app{min-height:100dvh;padding-bottom:calc(var(--nav-height) + env(safe-area-inset-bottom) + 14px)}.app.reading{padding-bottom:28px}.wrap{width:min(100%,var(--content-max));margin:0 auto;padding-inline:var(--page-padding)}
.mobile-header{position:sticky;top:0;z-index:20;height:calc(var(--header-height) + env(safe-area-inset-top));padding-top:env(safe-area-inset-top);display:flex;align-items:center;background:color-mix(in srgb,var(--bg) 78%,transparent);backdrop-filter:saturate(150%) blur(18px);border-bottom:1px solid transparent}.mobile-header.scrolled{border-bottom-color:var(--border)}.header-inner{display:flex;align-items:center;justify-content:space-between;width:100%}.brand{font-weight:750;letter-spacing:-.03em}.brand-dot{display:inline-block;width:9px;height:9px;border-radius:50%;background:var(--accent);margin-right:8px;box-shadow:0 0 22px color-mix(in srgb,var(--accent) 55%,transparent)}.header-actions{display:flex;gap:8px;align-items:center}.icon-btn,.lang-btn{min-width:var(--tap-min);height:var(--tap-min);border:0;border-radius:12px;background:transparent;color:var(--text-secondary);display:inline-flex;align-items:center;justify-content:center;cursor:pointer}.lang-btn{padding:0 10px;min-width:auto;font-size:14px}.icon-btn:hover,.lang-btn:hover{background:var(--surface-1);color:var(--text-primary)}
.hero{min-height:min(640px,78svh);display:flex;flex-direction:column;justify-content:center;padding-block:44px 36px}.eyebrow{font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--text-muted);font-weight:700}.hero h1{font-size:var(--text-hero);line-height:1.02;letter-spacing:-.055em;margin:14px 0 18px;max-width:8.6ch}.hero p{color:var(--text-secondary);max-width:31ch;margin:0 0 28px;font-size:18px;line-height:1.55}.cta-row{display:flex;gap:10px;flex-wrap:wrap}.btn{height:var(--button-height);border-radius:var(--radius-md);padding:0 18px;border:1px solid var(--border);display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:700;cursor:pointer}.btn-primary{background:var(--accent);color:white;border-color:transparent;box-shadow:0 12px 32px color-mix(in srgb,var(--accent) 18%,transparent)}.btn-secondary{background:var(--surface-1)}.btn:active{transform:scale(.985)}.subtle-note{margin-top:13px;color:var(--text-muted);font-size:14px}.cap-strip{display:flex;gap:18px;overflow:auto;margin-top:38px;color:var(--text-secondary);font-size:14px;scrollbar-width:none}.cap-strip::-webkit-scrollbar{display:none}
.section{padding:34px 0}.section-head{display:flex;justify-content:space-between;gap:20px;align-items:end;margin-bottom:18px}.section h2{font-size:26px;line-height:1.1;letter-spacing:-.035em;margin:0}.section-sub{margin:7px 0 0;color:var(--text-secondary);font-size:15px}.text-link{color:var(--text-secondary);font-size:14px;white-space:nowrap}.carousel{display:grid;grid-auto-flow:column;grid-auto-columns:min(326px,86vw);gap:14px;overflow-x:auto;scroll-snap-type:x mandatory;padding-bottom:6px;margin-right:calc(-1 * var(--page-padding));padding-right:var(--page-padding);scrollbar-width:none}.carousel::-webkit-scrollbar{display:none}.path-card{scroll-snap-align:start;min-height:210px;background:linear-gradient(145deg,var(--surface-2),var(--surface-1));border:1px solid var(--border);border-radius:var(--radius-xl);padding:22px;display:flex;flex-direction:column}.path-card h3{font-size:25px;line-height:1.08;margin:12px 0 10px;letter-spacing:-.03em}.path-card p{color:var(--text-secondary);margin:0;max-width:26ch}.path-card .grow{flex:1}.path-meta{font-size:14px;color:var(--text-muted)}.arrow{margin-left:auto}
.stack{display:grid;gap:12px}.course-card,.project-card,.continue-card,.skill-row,.update-row{background:var(--surface-1);border:1px solid var(--border);border-radius:var(--radius-lg);padding:18px}.course-card{min-height:180px;display:flex;flex-direction:column}.course-card h3,.project-card h3{margin:9px 0 8px;font-size:23px;line-height:1.1;letter-spacing:-.03em}.course-card p,.project-card p{margin:0;color:var(--text-secondary);font-size:15px}.card-footer{display:flex;align-items:center;gap:10px;margin-top:auto;padding-top:20px;color:var(--text-muted);font-size:14px}.chip{display:inline-flex;align-items:center;min-height:30px;padding:4px 10px;background:var(--surface-2);border:1px solid var(--border);border-radius:999px;font-size:13px;color:var(--text-secondary)}.project-card{background:linear-gradient(150deg,var(--surface-2),var(--surface-1));}.flow{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px;line-height:1.55;color:var(--text-secondary);white-space:pre-line;margin:16px 0}.skill-row,.update-row{display:flex;justify-content:space-between;align-items:center;min-height:76px}.skill-name{font-weight:700}.skill-desc,.update-meta{font-size:14px;color:var(--text-muted)}.tool-strip{display:flex;gap:10px;overflow:auto;scrollbar-width:none}.tool-strip::-webkit-scrollbar{display:none}.tool-pill{flex:0 0 auto;padding:12px 14px;border-radius:14px;background:var(--surface-1);border:1px solid var(--border);font-weight:650}
.continue-card{display:grid;gap:12px}.progress-track{height:5px;background:var(--surface-3);border-radius:999px;overflow:hidden}.progress-bar{height:100%;background:var(--accent);border-radius:999px}.progress-meta{display:flex;justify-content:space-between;color:var(--text-muted);font-size:13px}
.bottom-nav{position:fixed;left:0;right:0;bottom:0;z-index:30;background:color-mix(in srgb,var(--bg) 86%,transparent);backdrop-filter:saturate(160%) blur(18px);border-top:1px solid var(--border);padding-bottom:env(safe-area-inset-bottom)}.bottom-nav-inner{height:var(--nav-height);display:grid;grid-template-columns:repeat(5,1fr);max-width:520px;margin:0 auto}.nav-item{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;color:var(--text-muted);font-size:11px}.nav-item svg{width:21px;height:21px}.nav-item.active{color:var(--accent)}
.page-hero{padding:34px 0 22px}.page-hero h1{font-size:34px;line-height:1.08;letter-spacing:-.045em;margin:8px 0 12px}.page-hero p{color:var(--text-secondary);margin:0;max-width:34ch}.search-field{margin-top:20px;height:52px;width:100%;border-radius:14px;background:var(--surface-1);border:1px solid var(--border);padding:0 16px;color:var(--text-primary);outline:none}.search-field:focus{border-color:color-mix(in srgb,var(--accent) 65%,transparent);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 14%,transparent)}
.path-list,.curriculum{display:grid;gap:8px}.path-row,.lesson-row{display:grid;grid-template-columns:34px 1fr auto;align-items:center;gap:10px;padding:14px 2px;border-bottom:1px solid var(--border)}.status-dot{width:24px;height:24px;border-radius:50%;border:1px solid var(--border);display:flex;align-items:center;justify-content:center;font-size:12px;color:var(--text-muted)}.status-dot.done{background:color-mix(in srgb,var(--success) 15%,transparent);color:var(--success);border-color:color-mix(in srgb,var(--success) 40%,transparent)}.status-dot.current{background:color-mix(in srgb,var(--accent) 15%,transparent);color:var(--accent);border-color:color-mix(in srgb,var(--accent) 45%,transparent)}.row-title{font-weight:650}.row-meta{font-size:13px;color:var(--text-muted)}
.course-visual{margin:24px 0;padding:16px 18px;border-radius:18px;background:var(--surface-1);border:1px solid var(--border);font-family:ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--text-secondary);text-align:center}.check-list{display:grid;gap:10px;margin:16px 0}.check-item{display:grid;grid-template-columns:22px 1fr;gap:10px}.check-icon{color:var(--success)}.outcome-card{padding:20px;border-radius:18px;background:linear-gradient(145deg,color-mix(in srgb,var(--accent) 10%,var(--surface-1)),var(--surface-1));border:1px solid color-mix(in srgb,var(--accent) 22%,var(--border))}
.lesson-topbar{position:sticky;top:0;z-index:25;background:color-mix(in srgb,var(--bg) 90%,transparent);backdrop-filter:blur(16px);padding-top:env(safe-area-inset-top);border-bottom:1px solid var(--border)}.lesson-topbar-inner{height:50px;display:flex;align-items:center;gap:10px}.back-link{width:36px;height:36px;border-radius:10px;display:flex;align-items:center;justify-content:center}.lesson-top-title{font-size:14px;color:var(--text-secondary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.lesson-percent{margin-left:auto;font-size:13px;color:var(--text-muted)}.lesson-progress{height:2px;background:var(--surface-3)}.lesson-progress div{height:100%;background:var(--accent)}
.lesson-shell{max-width:720px;margin:auto}.lesson-hero{padding:34px var(--page-padding) 18px}.lesson-hero h1{font-size:34px;line-height:1.05;letter-spacing:-.045em;margin:12px 0}.lesson-hero p{color:var(--text-secondary);max-width:31ch;margin:0}.lesson-body{padding:0 var(--page-padding);font-size:17px;line-height:1.68}.lesson-body h2{font-size:26px;line-height:1.14;letter-spacing:-.035em;margin:46px 0 14px}.lesson-body p{margin:0 0 17px}.block{margin:30px 0}.panel{background:var(--surface-1);border:1px solid var(--border);border-radius:18px;padding:18px}.block-label{font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--text-muted);font-weight:750;margin-bottom:12px}.triptych{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.motion-card{padding:14px 10px;border-radius:14px;background:var(--surface-1);border:1px solid var(--border);text-align:center}.motion-icon{height:54px;display:flex;align-items:center;justify-content:center;font-size:24px;color:var(--accent)}.motion-name{font-size:13px;font-weight:700}.motion-desc{font-size:12px;color:var(--text-muted);margin-top:3px}.prompt-block,.example-block,.warning-block,.takeaway-block{background:var(--surface-1);border:1px solid var(--border);border-radius:18px;padding:18px}.prompt-head,.block-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:13px}.copy-btn{height:34px;padding:0 11px;border-radius:10px;border:1px solid var(--border);background:var(--surface-2);color:var(--text-secondary);cursor:pointer}.prompt-text{white-space:pre-wrap;color:var(--text-primary);line-height:1.62}.try-grid{display:grid;gap:12px}.field label{display:block;font-size:13px;color:var(--text-muted);margin-bottom:6px}.field input,.field select{width:100%;height:48px;border-radius:13px;border:1px solid var(--border);background:var(--surface-2);color:var(--text-primary);padding:0 13px}.output{margin-top:14px;padding:14px;border-radius:14px;background:var(--surface-2);color:var(--text-secondary);font-size:15px}.warning-block{border-color:color-mix(in srgb,var(--warning) 35%,var(--border));background:color-mix(in srgb,var(--warning) 6%,var(--surface-1))}.takeaway-block{border-color:color-mix(in srgb,var(--accent) 35%,var(--border));background:color-mix(in srgb,var(--accent) 7%,var(--surface-1))}.lesson-actions{padding:32px var(--page-padding) 20px}.complete-btn{width:100%}.next-card{margin-top:18px;padding:20px;background:var(--surface-1);border:1px solid var(--border);border-radius:18px}.next-card h3{font-size:23px;margin:8px 0}.next-card p{color:var(--text-secondary);margin:0 0 16px}.metadata-line{display:flex;gap:10px;flex-wrap:wrap;color:var(--text-muted);font-size:14px}.footer{padding:40px 0 30px;color:var(--text-muted);font-size:14px}.footer-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}.footer a{display:block;margin:7px 0;color:var(--text-secondary)}
@media(min-width:700px){.wrap{padding-inline:24px}.hero{min-height:620px}.bottom-nav{display:none}.app{padding-bottom:40px}.carousel{margin-right:0;padding-right:0}.triptych{gap:12px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important;animation:none!important}}
/* V1 deploy additions */
.sheet-backdrop{position:fixed;inset:0;z-index:80;background:rgba(0,0,0,.48);display:none;align-items:flex-end}.sheet-backdrop.open{display:flex}.sheet{width:min(100%,520px);max-height:min(78dvh,720px);overflow:auto;margin:0 auto;background:var(--surface-1);border:1px solid var(--border);border-bottom:0;border-radius:28px 28px 0 0;padding:10px 18px calc(18px + env(safe-area-inset-bottom));box-shadow:0 -24px 70px rgba(0,0,0,.28)}.sheet-handle{width:42px;height:4px;border-radius:999px;background:var(--surface-3);margin:3px auto 12px}.sheet-head{display:flex;align-items:center;justify-content:space-between;font-size:20px;margin-bottom:8px}.language-list{display:grid}.language-row{min-height:50px;border:0;border-bottom:1px solid var(--border);background:transparent;color:var(--text-primary);display:flex;align-items:center;justify-content:space-between;padding:0 4px;text-align:left}.sheet-note{font-size:13px;color:var(--text-muted);line-height:1.55;margin:16px 0 0}.reading-badge{display:inline-flex;margin-top:12px;padding:5px 9px;border-radius:999px;background:var(--surface-1);border:1px solid var(--border);font-size:12px;color:var(--text-muted)}
.search-results{display:grid;gap:10px;margin-top:18px}.search-result{display:grid;grid-template-columns:1fr auto;align-items:center;gap:12px;padding:16px;border-radius:16px;background:var(--surface-1);border:1px solid var(--border)}.search-result-title{font-weight:750;font-size:18px;margin:3px 0}.search-result-desc{font-size:14px;color:var(--text-secondary)}.empty-state{padding:20px;border-radius:16px;background:var(--surface-1);border:1px solid var(--border);color:var(--text-secondary)}
.grid-2{display:grid;gap:12px}.feature-card{background:var(--surface-1);border:1px solid var(--border);border-radius:20px;padding:20px}.feature-card h3{font-size:22px;line-height:1.1;margin:9px 0}.feature-card p{color:var(--text-secondary);font-size:15px}.step-list{counter-reset:step;display:grid;gap:10px}.step-card{display:grid;grid-template-columns:38px 1fr;gap:12px;align-items:start;padding:16px;border:1px solid var(--border);background:var(--surface-1);border-radius:16px}.step-num{width:34px;height:34px;border-radius:50%;display:grid;place-items:center;background:color-mix(in srgb,var(--accent) 14%,var(--surface-2));color:var(--accent);font-weight:800}.chunk-card{padding:12px;border:1px solid var(--border);background:var(--surface-2);border-radius:12px;margin-top:8px}.chunk-card p{margin:5px 0 0;color:var(--text-secondary);font-size:14px}.privacy-callout{padding:16px;border:1px solid color-mix(in srgb,var(--success) 28%,var(--border));background:color-mix(in srgb,var(--success) 6%,var(--surface-1));border-radius:16px;color:var(--text-secondary)}
@media(min-width:700px){.grid-2{grid-template-columns:repeat(2,1fr)}}
.locale-fallback{position:relative;z-index:95;display:flex;gap:12px;align-items:center;justify-content:space-between;padding:9px 14px;background:var(--surface-2);border-bottom:1px solid var(--border);font-size:12px;line-height:1.4;color:var(--text-secondary)}.locale-fallback button{width:32px;height:32px;flex:0 0 auto;border:0;border-radius:9px;background:transparent;color:var(--text-secondary);font-size:20px}
/* V2 development additions */
.resume-pill{position:fixed;right:16px;bottom:calc(22px + env(safe-area-inset-bottom));z-index:65;border:1px solid var(--border);background:var(--text-primary);color:var(--bg);padding:11px 14px;border-radius:999px;font-weight:750;box-shadow:0 12px 34px rgba(0,0,0,.28);opacity:0;transform:translateY(12px);transition:.2s ease}.resume-pill.show{opacity:1;transform:none}
.project-step-action{margin-top:12px;min-height:42px;border:1px solid var(--border);background:var(--surface-2);color:var(--text-primary);padding:0 13px;border-radius:12px;font-weight:700}.project-step-action.done{background:color-mix(in srgb,var(--success) 12%,var(--surface-2));color:var(--success);border-color:color-mix(in srgb,var(--success) 26%,var(--border))}
.metric-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.metric{background:var(--surface-1);border:1px solid var(--border);border-radius:16px;padding:16px;min-width:0}.metric strong{display:block;font-size:28px;letter-spacing:-.03em}.metric span{font-size:12px;color:var(--text-muted);line-height:1.35}
.concept-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.concept-cell{padding:15px;border-radius:15px;border:1px solid var(--border);background:var(--surface-1)}.concept-cell strong{display:block;margin-bottom:5px}.concept-cell p{margin:0;color:var(--text-secondary);font-size:14px}
.goodbad{display:grid;gap:10px}.goodbad-card{padding:16px;border-radius:16px;border:1px solid var(--border);background:var(--surface-1)}.goodbad-card.good{border-color:color-mix(in srgb,var(--success) 28%,var(--border))}.goodbad-card.bad{border-color:color-mix(in srgb,var(--danger) 26%,var(--border))}.goodbad-card .label{font-size:12px;text-transform:uppercase;letter-spacing:.08em;color:var(--text-muted);font-weight:800}
.dev-banner{padding:10px 18px;background:color-mix(in srgb,var(--accent) 10%,var(--surface-1));border-bottom:1px solid var(--border);font-size:12px;color:var(--text-secondary);text-align:center}
@media(min-width:700px){.concept-grid{grid-template-columns:repeat(4,1fr)}.goodbad{grid-template-columns:1fr 1fr}}
/* V3 product additions */
.workflow-line{display:flex;align-items:center;gap:7px;overflow-x:auto;padding:14px;border:1px solid var(--border);background:var(--surface-1);border-radius:16px;scrollbar-width:none}.workflow-line::-webkit-scrollbar{display:none}.workflow-line span{white-space:nowrap;padding:7px 10px;border-radius:10px;background:var(--surface-2);font-size:12px;font-weight:800;letter-spacing:.06em}.workflow-line b{color:var(--accent);font-weight:800}.workflow-output-row{display:grid;grid-template-columns:72px 1fr;gap:10px;padding:9px 0;border-bottom:1px solid var(--border)}.workflow-output-row:last-child{border-bottom:0}.workflow-output-row strong{font-size:11px;letter-spacing:.08em;color:var(--accent)}.workflow-output-row span{color:var(--text-secondary);font-size:14px}.code-output{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;white-space:pre-wrap;overflow-wrap:anywhere}.health-table{width:100%;border-collapse:collapse}.health-table th,.health-table td{text-align:left;padding:12px 8px;border-bottom:1px solid var(--border);font-size:14px}.health-table th{color:var(--text-muted);font-size:12px;text-transform:uppercase;letter-spacing:.06em}.health-ok{color:var(--success)}.health-progress{color:var(--warning)}.status-grid{display:grid;gap:10px}.status-row{display:grid;grid-template-columns:1fr auto;gap:14px;padding:14px 0;border-bottom:1px solid var(--border)}
@media(max-width:420px){.metric-grid{grid-template-columns:repeat(2,1fr)}.workflow-output-row{grid-template-columns:64px 1fr}}

/* V4 learning expansion */
.output{white-space:pre-wrap}.course-visual{overflow-wrap:anywhere}.feature-card{display:block}.feature-card:active{transform:scale(.99)}

.course-completion{background:var(--surface-1);border:1px solid var(--border);border-radius:20px;padding:20px;display:grid;gap:14px}.course-completion.is-complete{border-color:color-mix(in srgb,var(--success) 42%,var(--border));background:color-mix(in srgb,var(--success) 6%,var(--surface-1))}.completion-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px}.completion-head h2{margin:6px 0 0;font-size:24px}.completion-head>strong{font-size:22px;color:var(--accent)}.course-completion.is-complete .completion-head>strong{color:var(--success)}.course-completion p{margin:0;color:var(--text-secondary)}

/* V8 quality loop */
.project-completion{background:var(--surface-1);border:1px solid var(--border);border-radius:20px;padding:20px;display:grid;gap:14px}.project-completion.is-complete{border-color:color-mix(in srgb,var(--success) 42%,var(--border));background:color-mix(in srgb,var(--success) 6%,var(--surface-1))}.completion-actions{display:flex;flex-wrap:wrap;gap:10px;align-items:center}.completion-date{display:inline-block;margin-left:6px;color:var(--text-muted);font-size:13px}.learning-summary-card{padding:18px;border:1px solid var(--border);border-radius:18px;background:var(--surface-1)}.mini-progress-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:14px}.mini-progress-grid>div{padding:12px;border-radius:14px;background:var(--surface-2)}.mini-progress-grid strong{display:block;font-size:24px}.mini-progress-grid span{display:block;color:var(--text-muted);font-size:11px;line-height:1.35}.achievement-grid{display:grid;gap:10px}.achievement{display:grid;grid-template-columns:42px 1fr;gap:12px;align-items:center;padding:15px;border-radius:16px;border:1px solid var(--border);background:var(--surface-1)}.achievement.unlocked{border-color:color-mix(in srgb,var(--success) 32%,var(--border));background:color-mix(in srgb,var(--success) 5%,var(--surface-1))}.achievement.locked{opacity:.62}.achievement-icon{width:38px;height:38px;border-radius:50%;display:grid;place-items:center;background:var(--surface-2);font-weight:800}.achievement.unlocked .achievement-icon{color:var(--success);background:color-mix(in srgb,var(--success) 12%,var(--surface-2))}.achievement p{margin:3px 0 0;color:var(--text-muted);font-size:13px}.history-list{display:grid;gap:8px}.history-row{display:grid;grid-template-columns:1fr auto;align-items:center;gap:12px;padding:14px 16px;border-radius:15px;background:var(--surface-1);border:1px solid var(--border)}.history-row strong{display:block;margin:3px 0;font-size:16px}.history-row span{font-size:12px;color:var(--text-muted)}

/* V9 localization, backup and mobile QA retained in V10 */
.progress-transfer{display:flex;flex-wrap:wrap;gap:10px;align-items:center;padding:18px;border:1px solid var(--border);background:var(--surface-1);border-radius:18px}.progress-transfer p{width:100%;margin:2px 0 0;color:var(--text-muted);font-size:13px}.course-curriculum-section .row-title{overflow-wrap:anywhere}.page-hero .metadata-line{display:flex;flex-wrap:wrap;gap:8px 14px;color:var(--text-muted);font-size:14px}.page-hero .cta-row .btn{max-width:100%}@media(max-width:430px){.page-hero h1{font-size:clamp(30px,9vw,36px)}.section h2{font-size:24px}.course-card h3,.project-card h3{font-size:21px}.completion-actions .btn{width:100%}.progress-transfer .btn{flex:1 1 150px}.health-table{display:block;overflow-x:auto;white-space:nowrap}}@media(max-width:380px){:root{--page-padding:16px}.page-hero{padding-top:28px}.hero{min-height:min(610px,76svh)}.btn{padding-inline:15px}.metric{padding:14px}.lesson-body{font-size:16.5px}.step-card{grid-template-columns:34px 1fr;gap:10px;padding:14px}}
/* V9 viewport containment retained in V10 */
.carousel{margin-right:0;padding-right:0;max-width:100%;overscroll-behavior-inline:contain}.tool-strip{max-width:100%;overscroll-behavior-inline:contain}


/* V10 responsive, filtered search and course history */
.search-filters{display:flex;gap:8px;overflow-x:auto;margin-top:14px;padding-bottom:2px;scrollbar-width:none;overscroll-behavior-inline:contain}.search-filters::-webkit-scrollbar{display:none}.search-filter{flex:0 0 auto;min-height:38px;padding:0 13px;border-radius:999px;border:1px solid var(--border);background:var(--surface-1);color:var(--text-secondary);cursor:pointer;font-size:13px;font-weight:700}.search-filter.active{color:#fff;background:var(--accent);border-color:transparent}.search-filter:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.course-history-grid{display:grid;gap:12px}.course-history-card{padding:18px;border-radius:18px;border:1px solid var(--border);background:var(--surface-1);display:grid;gap:12px}.course-history-card.is-complete{border-color:color-mix(in srgb,var(--success) 30%,var(--border));background:color-mix(in srgb,var(--success) 4%,var(--surface-1))}.course-history-top{display:flex;align-items:flex-start;justify-content:space-between;gap:14px}.course-history-top h3{margin:5px 0 0;font-size:20px;line-height:1.16}.course-history-top strong{font-size:19px;color:var(--accent)}.course-history-card.is-complete .course-history-top strong{color:var(--success)}.course-history-meta{display:flex;flex-wrap:wrap;gap:7px 14px;color:var(--text-muted);font-size:13px}.course-history-actions{display:flex;flex-wrap:wrap;gap:10px;align-items:center}.project-next-card{margin-top:4px;padding:15px;border-radius:15px;background:var(--surface-2);border:1px solid var(--border)}.project-next-card strong{display:block;margin-bottom:4px}.desktop-nav{display:none}
@media(min-width:760px){:root{--content-max:860px;--page-padding:24px}.hero{min-height:560px}.page-hero{padding-top:48px}.page-hero h1{font-size:42px}.page-hero p{max-width:58ch}.course-history-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.achievement-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.metric-grid{grid-template-columns:repeat(4,1fr)}}
@media(min-width:900px){:root{--content-max:1080px;--page-padding:30px;--text-hero:clamp(54px,6vw,68px)}.app{padding-bottom:34px}.bottom-nav{display:none}.mobile-header{height:68px}.header-inner{gap:18px}.desktop-nav{display:flex;align-items:center;gap:4px;margin-left:auto}.desktop-nav a{padding:8px 11px;border-radius:10px;color:var(--text-muted);font-size:14px;font-weight:650}.desktop-nav a:hover{background:var(--surface-1);color:var(--text-primary)}.desktop-nav a.active{background:color-mix(in srgb,var(--accent) 12%,var(--surface-1));color:var(--accent)}.header-actions{margin-left:2px}.hero{min-height:570px;padding-block:58px 46px}.hero h1{max-width:11ch}.hero p{max-width:44ch;font-size:20px}.section{padding:42px 0}.section h2{font-size:29px}.app:not(.reading) main>.section.wrap>.stack{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-2{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.course-card{min-height:190px}.page-hero{padding-top:56px;padding-bottom:34px}.page-hero h1{font-size:50px;max-width:16ch}.course-curriculum-section{max-width:900px}.course-curriculum-section .lesson-row{padding-block:16px}.footer{padding-bottom:48px}.footer-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:28px}.progress-transfer{padding:22px}.search-results{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.search-result{min-height:128px}.project-completion,.course-completion{padding:24px}}
@media(min-width:1180px){:root{--content-max:1160px}.app:not(.reading) main>.section.wrap>.stack{grid-template-columns:repeat(3,minmax(0,1fr))}.grid-2{grid-template-columns:repeat(3,minmax(0,1fr))}.course-history-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.achievement-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.page-hero h1{font-size:54px}}


/* V14 lesson study experience */
.lesson-study-tools{margin:0 auto 18px;max-width:760px;padding:16px 18px;border:1px solid var(--border);border-radius:18px;background:var(--surface-1)}.lesson-study-top{display:flex;align-items:flex-start;justify-content:space-between;gap:14px}.lesson-study-top strong{display:block;margin-top:4px;font-size:15px}.study-toggle-row{display:flex;flex-wrap:wrap;gap:8px;justify-content:flex-end}.study-toggle{min-height:36px;padding:0 11px;border:1px solid var(--border);border-radius:999px;background:var(--surface-2);color:var(--text-secondary);font-size:12px;font-weight:750;cursor:pointer}.study-toggle.active{border-color:color-mix(in srgb,var(--accent) 38%,var(--border));background:color-mix(in srgb,var(--accent) 10%,var(--surface-2));color:var(--accent)}.lesson-outline{display:flex;gap:7px;overflow-x:auto;margin-top:14px;padding-top:13px;border-top:1px solid var(--border);scrollbar-width:none}.lesson-outline::-webkit-scrollbar{display:none}.lesson-outline a{flex:0 0 auto;max-width:220px;padding:7px 10px;border-radius:10px;background:var(--surface-2);color:var(--text-secondary);font-size:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.lesson-body h2[id],.lesson-body h3[id],.lesson-body .block[id]{scroll-margin-top:88px}.lesson-practice-card{margin:24px auto;max-width:760px;padding:18px;border:1px solid var(--border);border-radius:18px;background:var(--surface-1);display:grid;gap:12px}.lesson-practice-card p{margin:4px 0 0;color:var(--text-muted);font-size:13px;line-height:1.55}.lesson-practice-card textarea{width:100%;resize:vertical;min-height:100px;border:1px solid var(--border);border-radius:14px;background:var(--surface-2);color:var(--text-primary);padding:13px;font:inherit;line-height:1.5;outline:none}.lesson-practice-card textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 12%,transparent)}.practice-actions{display:flex;align-items:center;gap:12px}.practice-actions span{font-size:12px;color:var(--success)}.course-time-left{font-size:13px;color:var(--text-muted);padding:10px 12px;border-radius:12px;background:var(--surface-2)}.study-list-grid{display:grid;gap:10px}.study-list-card{display:grid;grid-template-columns:1fr auto;align-items:center;gap:14px;padding:15px 16px;border:1px solid var(--border);border-radius:16px;background:var(--surface-1)}.study-list-card strong{display:block;margin:4px 0;font-size:16px}.study-list-card p{margin:6px 0 0;color:var(--text-muted);font-size:13px;line-height:1.5;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.study-list-card>span{color:var(--accent);font-size:18px}@media(max-width:430px){.lesson-study-top{display:grid}.study-toggle-row{justify-content:flex-start}.study-toggle{flex:1 1 120px}.lesson-study-tools,.lesson-practice-card{margin-inline:var(--page-padding)}}@media(min-width:760px){.study-list-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(min-width:1180px){.study-list-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}


/* V14 knowledge checks */
.knowledge-check-card{margin:28px auto;max-width:760px;padding:20px;border:1px solid var(--border);border-radius:20px;background:var(--surface-1);display:grid;gap:14px}.quiz-head,.course-quiz-top{display:flex;justify-content:space-between;align-items:flex-start;gap:14px}.quiz-head h2,.course-quiz-top h3{margin:5px 0 0}.quiz-status{display:grid;place-items:center;flex:0 0 38px;height:38px;border:1px solid var(--border);border-radius:50%;background:var(--surface-2);font-weight:800;color:var(--text-muted)}.quiz-status.pass{color:var(--success);border-color:color-mix(in srgb,var(--success) 40%,var(--border));background:color-mix(in srgb,var(--success) 9%,var(--surface-2))}.quiz-options{display:grid;gap:9px}.quiz-option{display:grid;grid-template-columns:32px 1fr;align-items:flex-start;gap:10px;width:100%;padding:13px;border:1px solid var(--border);border-radius:14px;background:var(--surface-2);color:var(--text-primary);text-align:left;cursor:pointer}.quiz-option:hover{border-color:color-mix(in srgb,var(--accent) 38%,var(--border))}.quiz-option>span{display:grid;place-items:center;width:28px;height:28px;border-radius:9px;background:var(--surface-1);font-size:12px;color:var(--accent)}.quiz-option strong{font-size:14px;line-height:1.55;font-weight:650}.quiz-option.wrong{border-color:color-mix(in srgb,#ef4444 42%,var(--border))}.quiz-feedback{padding:11px 12px;border-radius:12px;background:var(--surface-2);color:var(--text-secondary);font-size:13px;line-height:1.55}.quiz-feedback.is-wrong{color:#ef8080}.quiz-local-note,.quiz-meta{margin:0;color:var(--text-muted);font-size:12px}.course-quiz-panel{margin-top:14px;padding:16px;border:1px solid var(--border);border-radius:18px;background:var(--surface-1)}.course-quiz-meta{display:flex;flex-wrap:wrap;gap:8px 14px;margin-top:10px;color:var(--text-muted);font-size:12px}.course-quiz-panel p{margin:10px 0 0;color:var(--text-muted);font-size:12px}.course-quiz-grid{display:grid;gap:10px}.course-quiz-card{display:block;padding:16px;border:1px solid var(--border);border-radius:18px;background:var(--surface-1);color:var(--text-primary)}.course-quiz-card:hover{border-color:color-mix(in srgb,var(--accent) 35%,var(--border))}.course-quiz-card .progress-track{margin-top:12px}@media(max-width:430px){.knowledge-check-card{margin-inline:var(--page-padding)}.quiz-head{display:grid;grid-template-columns:1fr auto}.quiz-option{padding:12px}.course-quiz-meta{display:grid;gap:4px}}@media(min-width:760px){.course-quiz-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(min-width:1180px){.course-quiz-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}


/* V14 course final assessments */
.final-assessment{scroll-margin-top:88px}.final-assessment-card{padding:20px;border:1px solid var(--border);border-radius:22px;background:var(--surface-1);display:grid;gap:18px}.assessment-head,.assessment-course-top{display:flex;justify-content:space-between;align-items:flex-start;gap:16px}.assessment-head h2,.assessment-course-top h3{margin:5px 0 0}.assessment-head p{max-width:700px;margin:8px 0 0;color:var(--text-secondary);line-height:1.6}.assessment-score-ring{display:grid;place-items:center;flex:0 0 58px;height:58px;border-radius:50%;border:1px solid var(--border);background:var(--surface-2);font-size:16px;font-weight:800;color:var(--accent)}.assessment-metrics,.assessment-course-meta{display:flex;flex-wrap:wrap;gap:8px 14px;color:var(--text-muted);font-size:12px}.assessment-actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.assessment-actions>span,.assessment-local{font-size:12px;color:var(--text-muted);margin:0}.assessment-question-list{display:grid;gap:14px}.assessment-question{margin:0;padding:16px;border:1px solid var(--border);border-radius:17px;background:var(--surface-2)}.assessment-question legend{padding:0 5px;font-weight:750;line-height:1.5}.assessment-question legend span{display:block;color:var(--accent);font-size:11px;text-transform:uppercase;letter-spacing:.06em;margin-bottom:5px}.assessment-options{display:grid;gap:8px;margin-top:12px}.assessment-options label{display:grid;grid-template-columns:20px 1fr;gap:9px;align-items:flex-start;padding:11px 12px;border:1px solid var(--border);border-radius:13px;background:var(--surface-1);cursor:pointer}.assessment-options label:has(input:checked){border-color:color-mix(in srgb,var(--accent) 45%,var(--border));background:color-mix(in srgb,var(--accent) 7%,var(--surface-1))}.assessment-options input{margin-top:4px}.assessment-options span{font-size:13px;line-height:1.55;color:var(--text-secondary)}.assessment-source-link{display:inline-block;margin-top:10px;font-size:12px}.assessment-submit{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.assessment-submit p{margin:0;color:var(--text-muted);font-size:12px}.assessment-weak{display:grid;gap:9px}.assessment-weak h3{margin:0}.assessment-weak-list{display:grid;gap:8px}.assessment-weak-item{display:flex;justify-content:space-between;gap:14px;align-items:center;padding:12px 13px;border:1px solid var(--border);border-radius:13px;background:var(--surface-2);color:var(--text-primary)}.assessment-weak-item div{display:grid;gap:3px}.assessment-weak-item span{font-size:11px;color:var(--text-muted)}.assessment-empty{padding:14px;border:1px dashed var(--border);border-radius:14px;color:var(--text-muted);font-size:13px}.assessment-progress-grid{display:grid;gap:10px}.assessment-course-card{display:block;padding:16px;border:1px solid var(--border);border-radius:18px;background:var(--surface-1);color:var(--text-primary)}.assessment-course-card.is-passed{border-color:color-mix(in srgb,var(--success) 34%,var(--border))}.assessment-course-card .progress-track{margin:12px 0 10px}.assessment-weak-grid{display:grid;gap:8px}@media(max-width:430px){.assessment-head{display:grid;grid-template-columns:1fr auto}.assessment-question{padding:13px}.assessment-options label{padding:10px}.assessment-weak-item{align-items:flex-start}.assessment-actions,.assessment-submit{align-items:stretch}.assessment-actions .btn,.assessment-submit .btn{width:100%}}@media(min-width:760px){.assessment-progress-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.assessment-weak-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(min-width:1180px){.assessment-progress-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}

/* V14 explainable local study plan */
.plan-preview{margin-top:12px;padding:16px 17px;border:1px solid var(--border);border-radius:17px;background:var(--surface-1);display:flex;align-items:center;justify-content:space-between;gap:16px}.plan-preview strong{display:block;margin:4px 0 5px;font-size:17px}.plan-preview p{margin:0;color:var(--text-muted);font-size:12px;line-height:1.5}.today-plan-grid,.plan-path-grid,.plan-review-list{display:grid;gap:12px}.plan-task-card{padding:18px;border:1px solid var(--border);border-radius:19px;background:var(--surface-1);display:grid;gap:14px}.plan-task-card.plan-review{border-color:color-mix(in srgb,#f59e0b 34%,var(--border))}.plan-task-head{display:flex;justify-content:space-between;gap:14px;align-items:flex-start}.plan-task-head h3{margin:5px 0 4px;font-size:20px}.plan-task-head p{margin:0;color:var(--text-muted);font-size:13px}.plan-time{white-space:nowrap;padding:6px 9px;border-radius:999px;background:var(--surface-2);font-size:11px;color:var(--text-secondary)}.plan-reason{display:grid;gap:3px;padding:11px 12px;border-radius:13px;background:var(--surface-2);font-size:12px}.plan-reason strong{color:var(--text-primary)}.plan-reason span{color:var(--text-muted);line-height:1.5}.plan-task-actions{display:flex;gap:9px;flex-wrap:wrap}.plan-next-card{padding:18px;border:1px solid var(--border);border-radius:19px;background:var(--surface-1);color:var(--text-primary);display:flex;justify-content:space-between;align-items:center;gap:18px}.plan-next-card h3{margin:5px 0 6px;font-size:22px}.plan-next-card p{margin:0;color:var(--text-muted);font-size:13px;line-height:1.5}.plan-next-progress{display:grid;justify-items:end;gap:4px;min-width:58px}.plan-next-progress strong{font-size:22px;color:var(--accent)}.plan-next-progress span{font-size:11px;color:var(--text-muted)}.plan-path-card{padding:16px;border:1px solid var(--border);border-radius:18px;background:var(--surface-1);display:grid;gap:12px}.plan-path-top{display:flex;justify-content:space-between;gap:12px;align-items:flex-start}.plan-path-top h3{margin:4px 0 0}.plan-path-top>strong{color:var(--accent)}.plan-path-courses{display:flex;gap:7px;flex-wrap:wrap}.plan-path-courses a{padding:7px 9px;border-radius:10px;background:var(--surface-2);color:var(--text-secondary);font-size:11px}.plan-path-courses a.done{color:var(--success)}.plan-review-row{display:grid;grid-template-columns:1fr auto;align-items:center;gap:10px;padding:12px 13px;border:1px solid var(--border);border-radius:16px;background:var(--surface-1)}.plan-review-row>a{display:flex;align-items:center;justify-content:space-between;gap:12px;color:var(--text-primary)}.plan-review-row strong{display:block;margin:4px 0}.plan-review-row small{display:block;color:var(--text-muted);line-height:1.45}.plan-review-row button{border:1px solid var(--border);background:var(--surface-2);color:var(--text-secondary);border-radius:11px;padding:8px 10px;cursor:pointer;font-weight:700;font-size:11px}@media(max-width:600px){.plan-preview,.plan-next-card{align-items:flex-start;display:grid}.plan-task-head{display:grid}.plan-task-actions .btn{flex:1 1 auto}.plan-review-row{grid-template-columns:1fr}.plan-review-row button{width:100%}}@media(min-width:760px){.today-plan-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.plan-path-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.plan-review-list{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(min-width:1180px){.today-plan-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.plan-path-grid{grid-template-columns:repeat(4,minmax(0,1fr))}}
\n\n/* V15 spaced review */\n.spaced-review-columns{display:grid;gap:14px;margin-top:16px}.spaced-review-columns>div{min-width:0}.spaced-review-columns h3{margin:0 0 9px;font-size:14px}.spaced-review-list{display:grid;gap:9px}.spaced-review-row{border:1px solid var(--border);border-radius:16px;background:var(--surface-1);padding:12px;display:grid;gap:9px}.spaced-review-row.today{border-color:color-mix(in srgb,#f59e0b 36%,var(--border))}.spaced-review-row>a{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;color:var(--text-primary)}.spaced-review-row strong{display:block;margin:4px 0}.spaced-review-row small{display:block;color:var(--text-muted);line-height:1.45}.review-due{display:grid;justify-items:end;gap:3px;min-width:76px}.review-due b{font-size:11px;color:var(--accent)}.review-due span{font-size:10px;color:var(--text-muted)}.spaced-review-row button{border:1px solid var(--border);background:var(--surface-2);color:var(--text-secondary);border-radius:11px;padding:9px 11px;cursor:pointer;font-weight:700;font-size:11px}.spaced-review-row button:hover{color:var(--text-primary)}@media(max-width:520px){.spaced-review-row>a{display:grid}.review-due{justify-items:start}.spaced-review-row button{width:100%}}@media(min-width:760px){.spaced-review-columns{grid-template-columns:repeat(3,minmax(0,1fr))}.spaced-review-columns.compact{grid-template-columns:repeat(3,minmax(0,1fr))}}\n

/* V16 tool-first tutorial layer */
.tool-first-hero{padding-bottom:22px}
.tool-guide-grid{display:grid;grid-template-columns:1fr;gap:14px}
.tool-guide-card{display:block;padding:18px;border:1px solid var(--border);border-radius:18px;background:var(--surface-1);text-decoration:none;color:var(--text-primary);transition:transform .18s ease,border-color .18s ease}
.tool-guide-card:hover{transform:translateY(-2px);border-color:var(--border-hover)}
.tool-guide-card h3{margin:6px 0 8px;font-size:20px}
.tool-guide-card p{margin:0 0 12px;color:var(--text-secondary);line-height:1.65}
.tool-guide-kicker{font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--text-muted)}
.tool-guide-card .text-link,.tool-guide-card>span:last-child{font-weight:650}
.tool-guide-card.featured{border-color:color-mix(in srgb,var(--accent) 34%,var(--border))}
.guide-meta{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px}
.guide-meta span{font-size:12px;color:var(--text-secondary);padding:6px 9px;border:1px solid var(--border);border-radius:999px}
.policy-note{padding:15px 16px;border:1px solid var(--border);border-radius:14px;background:var(--surface-1);color:var(--text-secondary);line-height:1.6}
.guide-prose{max-width:780px;margin:0 auto}
.guide-prose p{line-height:1.78}
.guide-section{margin:34px 0}
.guide-section h2{font-size:24px;line-height:1.25;margin:0 0 12px}
.guide-sources{display:grid;gap:18px;padding:20px;border:1px solid var(--border);border-radius:18px;background:var(--surface-1)}
.guide-source-list{display:grid;gap:8px}
.guide-source-list a{display:flex;justify-content:space-between;gap:12px;padding:12px 0;border-top:1px solid var(--border);text-decoration:none;color:var(--text-primary)}
.footer-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:28px}
.footer-grid>div{display:grid;gap:9px}.footer-grid a{color:var(--text-secondary);text-decoration:none}
html[lang="en"] [data-guide-lang]:not([data-guide-lang="en"]),
html[lang="zh-CN"] [data-guide-lang]:not([data-guide-lang="zh-cn"]),
html[lang="zh-TW"] [data-guide-lang]:not([data-guide-lang="zh-tw"]),
html[lang="es"] [data-guide-lang]:not([data-guide-lang="es"]),
html[lang="fr"] [data-guide-lang]:not([data-guide-lang="fr"]),
html[lang="de"] [data-guide-lang]:not([data-guide-lang="de"]),
html[lang="it"] [data-guide-lang]:not([data-guide-lang="it"]),
html[lang="ja"] [data-guide-lang]:not([data-guide-lang="ja"]),
html[lang="ko"] [data-guide-lang]:not([data-guide-lang="ko"]){display:none!important}
@media(min-width:760px){.tool-guide-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.tool-guide-grid.compact{grid-template-columns:repeat(4,minmax(0,1fr))}.guide-sources{grid-template-columns:minmax(180px,.7fr) minmax(0,1.3fr);align-items:start}}

/* V17 practical tutorial library */
.tutorial-list-grid{display:grid;grid-template-columns:1fr;gap:12px}
.tutorial-mini-card{display:flex;flex-direction:column;gap:9px;min-height:190px;padding:18px;border:1px solid var(--border);border-radius:18px;background:var(--surface-1);text-decoration:none;color:var(--text-primary);transition:transform .15s ease,border-color .15s ease}
.tutorial-mini-card:hover{transform:translateY(-2px);border-color:var(--border-hover)}
.tutorial-mini-card strong{font-size:18px;line-height:1.35}
.tutorial-mini-card p{margin:0;color:var(--text-secondary);line-height:1.6}
.tutorial-mini-card .text-link{margin-top:auto}
.tutorial-badge{align-self:flex-start;padding:5px 8px;border:1px solid var(--border);border-radius:999px;color:var(--text-secondary);font-size:11px;font-weight:700;letter-spacing:.03em}
.tutorial-count{color:var(--text-muted);font-size:13px;white-space:nowrap}
.tutorial-category{scroll-margin-top:80px}
@media(min-width:680px){.tutorial-list-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(min-width:1040px){.tutorial-list-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}


/* V18 global 9-language selector */
.global-language-control{position:fixed;top:max(12px,env(safe-area-inset-top));right:max(12px,env(safe-area-inset-right));z-index:1200}
.global-lang-btn{box-shadow:0 8px 28px rgba(0,0,0,.16);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px)}
.lang-btn{display:inline-flex;align-items:center;gap:7px;white-space:nowrap}
.lang-globe{font-size:15px;line-height:1}.lang-word{font-size:12px;font-weight:700;letter-spacing:.01em}
.language-sheet .sheet-head>div{display:grid;gap:3px}.language-current{color:var(--text-muted);font-size:11px;font-weight:500}
.language-row>span:first-child{display:grid;gap:2px;text-align:left}.language-row small{font-size:10px;color:var(--text-muted);font-weight:500}.language-row.is-current{background:var(--surface-2)}.language-check{font-weight:800;color:var(--accent)}
@media(max-width:520px){.mobile-header .lang-word{display:inline}.global-language-control .lang-word{display:inline}.global-language-control{top:max(10px,env(safe-area-inset-top));right:max(10px,env(safe-area-inset-right))}}
.v18-localized-steps{display:grid;gap:12px;margin:0;padding-left:22px}.v18-localized-steps li{padding-left:5px;color:var(--text-secondary);line-height:1.72}.v18-localized-guide .prompt-block p,.v18-localized-guide .warning-block p{white-space:pre-line}


/* V19 iPhone/mobile hardening */
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;background:var(--bg)}
body{min-width:0;-webkit-tap-highlight-color:transparent}
button,input,select,textarea{font:inherit}
a,button{touch-action:manipulation}
.mobile-header,.bottom-nav,.lesson-topbar{-webkit-backdrop-filter:saturate(150%) blur(18px)}
.wrap{padding-left:max(var(--page-padding),env(safe-area-inset-left));padding-right:max(var(--page-padding),env(safe-area-inset-right))}
.lesson-hero,.lesson-body,.lesson-actions{padding-left:max(var(--page-padding),env(safe-area-inset-left));padding-right:max(var(--page-padding),env(safe-area-inset-right))}
.sheet{padding-left:max(18px,env(safe-area-inset-left));padding-right:max(18px,env(safe-area-inset-right));overscroll-behavior:contain;-webkit-overflow-scrolling:touch}
.sheet-backdrop{overscroll-behavior:contain}
body.language-sheet-open{overflow:hidden}
.resume-pill{right:max(16px,env(safe-area-inset-right))}
.back-link{width:44px;height:44px;flex:0 0 44px}
.copy-btn,.search-filter,.plan-review-row button,.spaced-review-row button{min-height:44px}
.btn{height:auto;min-height:var(--button-height);padding-top:11px;padding-bottom:11px;line-height:1.25;text-align:center;white-space:normal}
.language-row{min-height:52px}
.prompt-text,.flow,.output,.guide-prose,.tutorial-mini-card,.tool-guide-card{overflow-wrap:anywhere}
.page-hero h1,.lesson-hero h1,.course-card h3,.project-card h3,.tutorial-mini-card strong,.tool-guide-card h3{-webkit-hyphens:auto;hyphens:auto;overflow-wrap:break-word}
.carousel,.tool-strip,.search-filters,.workflow-line{-webkit-overflow-scrolling:touch}
.icon-btn:focus-visible,.lang-btn:focus-visible,.btn:focus-visible,.copy-btn:focus-visible,.back-link:focus-visible,.nav-item:focus-visible,.language-row:focus-visible,a:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
@media (hover:none){.icon-btn:hover,.lang-btn:hover{background:transparent;color:var(--text-secondary)}.tool-guide-card:hover,.tutorial-mini-card:hover{transform:none;border-color:var(--border)}}
@media(max-width:520px){.section-head{align-items:flex-start;flex-wrap:wrap}.section-head>*{min-width:0}.section-head>.text-link{display:inline-flex;align-items:center;min-height:44px;white-space:normal}.guide-source-list a{min-height:44px;align-items:center}.header-actions{gap:2px}.lang-btn{padding-inline:8px}}
@media(min-width:700px) and (max-width:899.98px){.bottom-nav{display:block}.app:not(.reading){padding-bottom:calc(var(--nav-height) + env(safe-area-inset-bottom) + 14px)}}
@media(max-height:500px) and (orientation:landscape){.hero{min-height:auto;padding-block:28px 24px}.sheet{max-height:92dvh}.bottom-nav-inner{height:58px}:root{--nav-height:58px}}
html[lang="de"] .hero h1,html[lang="fr"] .hero h1,html[lang="it"] .hero h1,html[lang="es"] .hero h1{max-width:12ch;font-size:clamp(38px,10vw,46px)}

/* V19 audit pass 6: compact interactive targets */
.study-toggle,.lesson-outline a,.plan-path-courses a,.assessment-source-link{min-height:44px}
.study-toggle,.lesson-outline a,.plan-path-courses a{display:inline-flex;align-items:center}
.assessment-source-link{display:inline-flex;align-items:center}
@media(max-width:430px){.lesson-outline a{max-width:min(220px,74vw)}}

/* V20 trust / policy footer: visible on every destination without competing with lesson content. */
.trust-footer{padding-top:24px;padding-bottom:calc(92px + env(safe-area-inset-bottom));color:var(--text-secondary);font-size:13px}
.trust-footer nav{display:flex;flex-wrap:wrap;gap:10px 18px;margin-bottom:10px}
.trust-footer a{color:var(--text-secondary);text-decoration:underline;text-decoration-color:color-mix(in srgb,currentColor 35%,transparent);text-underline-offset:3px}
.trust-footer p{margin:0;line-height:1.55}
@media (min-width:900px){.trust-footer{padding-bottom:32px}}

/* V21 rich tutorial maps: lightweight, screenshot-free, and iPhone-first. */
.guide-visual-map{padding-top:18px}
.visual-map-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:14px}
.visual-map-head h2{margin:4px 0 0;font-size:clamp(24px,6vw,32px)}
.research-stamp{flex:0 0 auto;font-size:11px;color:var(--text-muted);border:1px solid var(--border);border-radius:999px;padding:7px 10px;background:var(--surface-1)}
.guide-map-grid{display:grid;grid-template-columns:1fr;gap:10px}
.guide-map-card{display:grid;grid-template-columns:34px minmax(0,1fr);gap:12px;padding:16px;border:1px solid var(--border);border-radius:18px;background:var(--surface-1);min-width:0}
.guide-map-card b{display:block;margin-bottom:7px;font-size:13px;letter-spacing:.01em}
.guide-map-card p{margin:0;color:var(--text-secondary);line-height:1.62}
.map-icon{width:34px;height:34px;border-radius:12px;display:grid;place-items:center;background:color-mix(in srgb,var(--accent) 12%,var(--surface-2));color:var(--accent);font-weight:800;font-size:15px}
.workflow-visual{display:grid;gap:8px}
.workflow-node{display:grid;grid-template-columns:26px minmax(0,1fr);gap:9px;align-items:flex-start;position:relative}
.workflow-node:not(:last-child)::after{content:"";position:absolute;left:12px;top:28px;bottom:-8px;width:1px;background:var(--border)}
.workflow-node>span{position:relative;z-index:1;width:26px;height:26px;border-radius:50%;display:grid;place-items:center;background:var(--surface-2);border:1px solid var(--border);font-size:11px;font-weight:800;color:var(--accent)}
.workflow-node p{font-size:13px;line-height:1.5;padding-top:2px}
.verify-card ul{margin:0;padding-left:18px;display:grid;gap:7px;color:var(--text-secondary)}
.verify-card li{line-height:1.5}
.current-product-note{margin-top:12px;display:grid;gap:11px;padding:15px 16px;border-radius:16px;border:1px solid color-mix(in srgb,var(--accent) 25%,var(--border));background:color-mix(in srgb,var(--accent) 5%,var(--surface-1))}
.current-product-note>div{display:grid;grid-template-columns:8px minmax(0,1fr);column-gap:10px;align-items:start}
.current-product-note strong{grid-column:2;font-size:13px;margin-bottom:4px}
.current-product-note p{grid-column:2;margin:0;color:var(--text-secondary);line-height:1.58;font-size:13px}
.current-product-note>a{justify-self:start;min-height:44px;display:inline-flex;align-items:center;font-size:12px;font-weight:750;color:var(--accent)}
.note-dot{grid-row:1/3;width:8px;height:8px;border-radius:50%;margin-top:5px;background:var(--accent);box-shadow:0 0 0 5px color-mix(in srgb,var(--accent) 10%,transparent)}
.guide-step-nav{position:relative;padding-top:2px;padding-bottom:6px}
.guide-step-nav-label{font-size:12px;color:var(--text-muted);font-weight:750;margin-bottom:8px}
.guide-step-scroll{display:flex;gap:8px;overflow-x:auto;scrollbar-width:none;padding:2px max(var(--page-padding),env(safe-area-inset-right)) 6px max(var(--page-padding),env(safe-area-inset-left));margin-left:calc(-1 * max(var(--page-padding),env(safe-area-inset-left)));margin-right:calc(-1 * max(var(--page-padding),env(safe-area-inset-right)));scroll-snap-type:x proximity;-webkit-overflow-scrolling:touch}
.guide-step-scroll::-webkit-scrollbar{display:none}
.guide-step-scroll a{scroll-snap-align:start;display:inline-flex;align-items:center;gap:7px;min-height:44px;max-width:min(260px,74vw);flex:0 0 auto;padding:8px 11px;border:1px solid var(--border);border-radius:13px;background:var(--surface-1);color:var(--text-secondary);font-size:12px;font-weight:650;line-height:1.25;text-decoration:none;white-space:normal}
.guide-step-scroll a>span{flex:0 0 22px;width:22px;height:22px;border-radius:50%;display:grid;place-items:center;background:var(--surface-2);color:var(--accent);font-size:10px;font-weight:800}
.iphone-guide-tip{display:flex;gap:8px;align-items:flex-start;margin-top:6px;padding:10px 12px;border-radius:12px;background:var(--surface-1);color:var(--text-muted);font-size:11px;line-height:1.45}
.iphone-guide-tip b{color:var(--text-secondary);white-space:nowrap}
.guide-section[id],.v18-localized-steps li[id]{scroll-margin-top:92px}
@media(min-width:760px){.guide-map-grid{grid-template-columns:.85fr 1.15fr 1fr}.current-product-note{grid-template-columns:minmax(0,1fr) auto;align-items:center}.current-product-note>a{justify-self:end}.guide-step-scroll{margin-inline:0;padding-inline:0}.iphone-guide-tip{max-width:760px}}
@media(max-width:430px){.visual-map-head{align-items:flex-start;flex-direction:column}.research-stamp{align-self:flex-start}.guide-map-card{padding:14px}.guide-visual-map{padding-top:12px}.current-product-note{padding:14px}.guide-step-scroll a{max-width:78vw}.guide-prose p{line-height:1.72}.guide-section{margin:28px 0}.guide-section h2{font-size:22px}}
@media(prefers-reduced-motion:reduce){.guide-step-scroll{scroll-behavior:auto}}
.guide-practice-card{margin-top:12px;display:grid;grid-template-columns:34px minmax(0,1fr);gap:12px;padding:15px 16px;border:1px dashed color-mix(in srgb,var(--accent) 34%,var(--border));border-radius:16px;background:color-mix(in srgb,var(--accent) 3%,var(--surface-1))}
.practice-icon{width:34px;height:34px;border-radius:12px;display:grid;place-items:center;background:var(--surface-2);color:var(--accent);font-size:12px}
.guide-practice-card strong{display:block;margin-bottom:5px;font-size:13px}.guide-practice-card p{margin:0 0 7px;color:var(--text-secondary);line-height:1.58;font-size:13px}.guide-practice-card small{display:block;color:var(--text-muted);line-height:1.48}.guide-practice-card small b{color:var(--text-secondary)}
.guide-decision-card{margin:18px 0 26px;display:grid;grid-template-columns:1fr;gap:10px}
.guide-decision-card>div{display:grid;grid-template-columns:28px minmax(0,1fr);gap:10px;padding:14px 15px;border:1px solid var(--border);border-radius:15px;background:var(--surface-1)}
.guide-decision-card>div>span{width:28px;height:28px;border-radius:10px;display:grid;place-items:center;background:var(--surface-2);color:var(--accent);font-weight:850}
.guide-decision-card b{display:block;font-size:12px;margin:1px 0 5px}.guide-decision-card p{margin:0!important;color:var(--text-secondary);font-size:13px;line-height:1.58!important}
@media(min-width:680px){.guide-decision-card{grid-template-columns:repeat(2,minmax(0,1fr))}}

/* V22 iPhone tutorial library jump navigation */
.cap-strip{scroll-snap-type:x proximity;-webkit-overflow-scrolling:touch}.cap-strip a{color:inherit;text-decoration:none;white-space:nowrap;min-height:44px;display:inline-flex;align-items:center;scroll-snap-align:start}.cap-strip a:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:8px}.tutorial-category{scroll-margin-top:84px}

/* V24 discovery + retention */
.v24-paths-section{padding-top:14px}
.v24-path-grid{display:grid;grid-template-columns:1fr;gap:12px}
.v24-path-grid.compact{margin-top:14px}
.v24-path-card{display:block;min-width:0;padding:18px;border:1px solid var(--border);border-radius:18px;background:var(--surface-1);color:var(--text-primary);text-decoration:none;transition:transform .15s ease,border-color .15s ease}
.v24-path-card:hover{transform:translateY(-2px);border-color:var(--border-hover)}
.v24-path-card-top{display:flex;align-items:center;justify-content:space-between;gap:12px}
.v24-path-card h3{margin:8px 0 8px;font-size:20px;line-height:1.32;overflow-wrap:anywhere}
.v24-path-card p{margin:0 0 14px;color:var(--text-secondary);line-height:1.62}
.v24-path-card small{display:block;margin-top:8px;color:var(--text-muted);line-height:1.45;overflow-wrap:anywhere}
.v24-mini-progress{height:6px;border-radius:999px;background:var(--surface-2);overflow:hidden}
.v24-mini-progress>span{display:block;height:100%;border-radius:inherit;background:var(--accent);transition:width .2s ease}
.v24-resume-section{padding-top:6px}
.v24-resume-card{display:grid;grid-template-columns:1fr;gap:16px;padding:18px;border:1px solid color-mix(in srgb,var(--accent) 30%,var(--border));border-radius:20px;background:color-mix(in srgb,var(--accent) 3%,var(--surface-1))}
.v24-resume-card h3{margin:7px 0 7px;font-size:21px;line-height:1.35;overflow-wrap:anywhere}.v24-resume-card p{margin:0 0 13px;color:var(--text-secondary);line-height:1.58}.v24-resume-card small{display:block;margin-top:7px;color:var(--text-muted)}
.v24-retention{padding-top:8px}.v24-retention-grid{display:grid;grid-template-columns:1fr;gap:12px}
.v24-complete-card{display:grid;grid-template-columns:1fr;gap:14px;padding:18px;border:1px solid var(--border);border-radius:18px;background:var(--surface-1)}
.v24-complete-card.is-complete{border-color:color-mix(in srgb,var(--accent) 34%,var(--border))}
.v24-complete-card h2{margin:5px 0 5px;font-size:24px}.v24-complete-card p{margin:0;color:var(--text-secondary);line-height:1.55}
.v24-path-chip{display:grid;grid-template-columns:minmax(0,1fr);gap:5px;padding:16px;border:1px solid var(--border);border-radius:18px;background:var(--surface-1);text-decoration:none;color:var(--text-primary)}
.v24-path-chip>span{font-size:11px;color:var(--text-muted);font-weight:800;text-transform:uppercase;letter-spacing:.06em}.v24-path-chip b{font-size:16px;line-height:1.35}.v24-path-chip small{color:var(--text-secondary)}
.v24-next-card{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:14px;padding:18px;border:1px solid var(--border);border-radius:18px;background:var(--surface-1);text-decoration:none;color:var(--text-primary)}
.v24-next-card strong{display:block;margin:6px 0 7px;font-size:18px;line-height:1.35;overflow-wrap:anywhere}.v24-next-card p{margin:0;color:var(--text-secondary);line-height:1.58}.v24-next-card>span{font-size:22px;color:var(--accent)}
.v24-card-status{align-self:flex-start;display:inline-flex;align-items:center;min-height:24px;padding:3px 7px;border-radius:999px;background:color-mix(in srgb,var(--accent) 9%,var(--surface-2));color:var(--accent);font-size:10px;font-weight:800;letter-spacing:.02em}
.tutorial-mini-card.v24-is-complete{border-color:color-mix(in srgb,var(--accent) 35%,var(--border))}.tutorial-mini-card.v24-is-viewed:not(.v24-is-complete){border-color:color-mix(in srgb,var(--text-muted) 42%,var(--border))}
.v24-path-overview{padding:19px;border:1px solid var(--border);border-radius:20px;background:var(--surface-1)}
.v24-path-progress-head{display:flex;justify-content:space-between;align-items:flex-start;gap:14px}.v24-path-progress-head h2{margin:6px 0 10px}.v24-path-overview>p{color:var(--text-secondary);line-height:1.65}.v24-path-overview>small{display:block;margin-top:12px;color:var(--text-muted)}
.v24-path-steps{display:grid;gap:10px;margin-top:16px}.v24-path-step{display:grid;grid-template-columns:36px minmax(0,1fr) auto;gap:12px;align-items:start;padding:16px;border:1px solid var(--border);border-radius:17px;background:var(--surface-1);text-decoration:none;color:var(--text-primary)}
.v24-path-step.is-complete{border-color:color-mix(in srgb,var(--accent) 34%,var(--border))}.v24-path-step.is-viewed:not(.is-complete){background:color-mix(in srgb,var(--accent) 2%,var(--surface-1))}
.v24-path-num{width:36px;height:36px;border-radius:12px;display:grid;place-items:center;background:var(--surface-2);color:var(--accent);font-weight:850}.v24-path-step small{display:block;color:var(--text-muted);margin-bottom:4px}.v24-path-step strong{display:block;font-size:17px;line-height:1.35;overflow-wrap:anywhere}.v24-path-step p{margin:6px 0 0;color:var(--text-secondary);line-height:1.55}.v24-path-step>span:last-child{align-self:center;color:var(--accent);font-size:18px}
.v24-progress-panel .v24-path-grid{margin-top:14px}.v24-reset{margin-top:14px}
@media(min-width:680px){.v24-path-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.v24-resume-card{grid-template-columns:minmax(0,1fr) auto;align-items:center}.v24-complete-card{grid-template-columns:minmax(0,1fr) auto;align-items:center}.v24-retention-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.v24-retention-grid>.v24-next-card{grid-column:1/-1}}
@media(min-width:980px){.v24-path-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.v24-path-grid.compact{grid-template-columns:repeat(5,minmax(0,1fr))}.v24-retention-grid{grid-template-columns:.75fr .75fr 1.5fr}.v24-retention-grid>.v24-next-card{grid-column:auto}}
@media(max-width:520px){.v24-path-card,.v24-resume-card,.v24-complete-card,.v24-next-card,.v24-path-overview{padding:15px}.v24-path-step{grid-template-columns:34px minmax(0,1fr) auto;padding:14px;gap:10px}.v24-path-num{width:34px;height:34px}.v24-path-card:hover{transform:none}.v24-resume-card .btn,.v24-complete-card .btn{width:100%;justify-content:center;min-height:46px}.v24-next-card{min-height:104px}.v24-path-step{min-height:92px}.v24-path-card h3{font-size:18px}}
@media(hover:none){.v24-path-card:hover{transform:none;border-color:var(--border)}}
/* V24 iPhone/localization hardening */
.v24-path-card p,.v24-resume-card p,.v24-next-card p,.v24-path-step p,.v24-path-chip b{overflow-wrap:anywhere;word-break:normal}
.v24-path-card:focus-visible,.v24-path-chip:focus-visible,.v24-next-card:focus-visible,.v24-path-step:focus-visible{outline:2px solid var(--accent);outline-offset:3px}

/* V25 flagship tutorial depth */
.v25-flagship{padding-top:10px}.v25-flagship-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:14px}.v25-flagship-head h2{margin:7px 0 3px;font-size:26px}.v25-flagship-head p{margin:0;color:var(--text-secondary);line-height:1.55}.v25-flagship-badge,.v25-card-flagship{display:inline-flex;align-items:center;gap:5px;border:1px solid color-mix(in srgb,var(--accent) 38%,var(--border));background:color-mix(in srgb,var(--accent) 7%,var(--surface-1));color:var(--accent);border-radius:999px;font-size:10px;font-weight:850;letter-spacing:.04em;padding:5px 8px}.v25-time{font-size:11px;color:var(--text-muted);white-space:nowrap}.v25-flagship-meta{color:var(--accent)!important}.v25-case-board{position:relative;overflow:hidden;padding:18px;border:1px solid var(--border);border-radius:20px;background:linear-gradient(135deg,color-mix(in srgb,var(--accent) 5%,var(--surface-1)),var(--surface-1))}.v25-case-flow{display:flex;align-items:center;gap:7px;margin-bottom:16px}.v25-case-flow span{width:29px;height:29px;border-radius:10px;background:var(--surface-2);border:1px solid var(--border);display:grid;place-items:center;color:var(--accent);font-size:10px;font-weight:850}.v25-case-flow i{height:1px;flex:1;background:var(--border)}.v25-case-board h3{margin:0 0 7px;font-size:20px;line-height:1.35}.v25-case-object{margin:0 0 16px;color:var(--text-secondary);font-size:15px;line-height:1.65}.v25-case-inputs{padding:14px;border-radius:15px;background:var(--surface-2)}.v25-case-inputs strong{display:block;font-size:12px;margin-bottom:8px}.v25-case-inputs ul,.v25-depth-card ul{margin:0;padding-left:18px}.v25-case-inputs li,.v25-depth-card li{margin:6px 0;color:var(--text-secondary);line-height:1.55}.v25-prompt-lab{margin-top:12px;padding:18px;border:1px solid var(--border);border-radius:20px;background:var(--surface-1)}.v25-module-title{display:flex;align-items:center;gap:9px;margin-bottom:12px}.v25-module-title>span{width:28px;height:28px;border-radius:10px;display:grid;place-items:center;background:var(--surface-2);color:var(--accent);font-weight:850}.v25-module-title strong{font-size:14px}.v25-module-title small{display:block;margin-top:2px;color:var(--text-muted);font-size:10px}.v25-prompt-grid{display:grid;grid-template-columns:1fr;gap:9px}.v25-prompt-level{padding:14px;border-radius:15px;border:1px solid var(--border);background:var(--surface-2)}.v25-prompt-level b{font-size:11px;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted)}.v25-prompt-level p{margin:7px 0 0;color:var(--text-secondary);font-size:13px;line-height:1.6;overflow-wrap:anywhere}.v25-prompt-level.is-best{border-color:color-mix(in srgb,var(--accent) 38%,var(--border));background:color-mix(in srgb,var(--accent) 4%,var(--surface-1))}.v25-prompt-level.is-best b{color:var(--accent)}.v25-prompt-level.is-bad{opacity:.78}.v25-detail-grid{display:grid;grid-template-columns:1fr;gap:10px;margin-top:12px}.v25-depth-card{padding:17px;border:1px solid var(--border);border-radius:18px;background:var(--surface-1);min-width:0}.v25-depth-card .v25-module-title{margin-bottom:8px}.v25-checklist{list-style:none!important;padding-left:0!important}.v25-checklist li{display:grid;grid-template-columns:18px minmax(0,1fr);gap:8px}.v25-checklist li>span{width:16px;height:16px;margin-top:3px;border:1px solid var(--border-hover);border-radius:5px;background:var(--surface-2)}.v25-safety{margin-top:13px;padding-top:12px;border-top:1px solid var(--border)}.v25-safety b{font-size:11px;color:var(--text-muted)}.v25-safety p{margin:5px 0 0;color:var(--text-secondary);font-size:12px;line-height:1.55}.v25-card-flagship{position:absolute;right:10px;top:10px;padding:4px 7px}.tutorial-mini-card{position:relative}.v25-task-first{padding-top:10px}.v25-task-grid{display:grid;grid-template-columns:1fr;gap:9px}.v25-task-card{display:grid;grid-template-columns:40px minmax(0,1fr) auto;gap:12px;align-items:center;min-height:82px;padding:15px;border:1px solid var(--border);border-radius:18px;background:var(--surface-1);color:var(--text-primary);text-decoration:none}.v25-task-card:hover{border-color:var(--border-hover);transform:translateY(-1px)}.v25-task-icon{width:40px;height:40px;border-radius:13px;display:grid;place-items:center;background:color-mix(in srgb,var(--accent) 8%,var(--surface-2));color:var(--accent);font-weight:850}.v25-task-card strong{display:block;font-size:15px;line-height:1.35}.v25-task-card p{margin:5px 0 0;color:var(--text-secondary);font-size:12px;line-height:1.48}.v25-task-arrow{color:var(--accent);font-size:18px}.v25-task-head{align-items:flex-end}.v25-task-card:focus-visible{outline:2px solid var(--accent);outline-offset:3px}.v25-card-flagship{pointer-events:none}
@media(min-width:720px){.v25-prompt-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.v25-detail-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.v25-task-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(min-width:1040px){.v25-task-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.v25-task-card:last-child:nth-child(4n+3){grid-column:auto}.v25-case-board{padding:21px}.v25-prompt-lab{padding:20px}}
@media(max-width:520px){.v25-flagship-head{align-items:flex-start;flex-direction:column}.v25-time{white-space:normal}.v25-case-board,.v25-prompt-lab,.v25-depth-card{padding:15px}.v25-case-object{font-size:14px}.v25-prompt-level p{font-size:12.5px}.v25-task-card{min-height:86px}.v25-task-head{align-items:flex-start}.v25-task-head .text-link{margin-top:4px}.v25-card-flagship{top:8px;right:8px}}
@media(hover:none){.v25-task-card:hover{transform:none;border-color:var(--border)}}

/* V26 — premium enterprise visual system */
:root{
  --bg:#07101F;
  --surface-1:#0D1728;
  --surface-2:#121E31;
  --surface-3:#18263B;
  --text-primary:#F7F9FC;
  --text-secondary:#AAB6C8;
  --text-muted:#718097;
  --border:rgba(173,196,230,.12);
  --border-hover:rgba(173,196,230,.24);
  --accent:#7C8CFF;
  --accent-2:#43D6C5;
  --content-max:1180px;
  --radius-lg:20px;
  --radius-xl:28px;
}
:root[data-theme="light"]{
  --bg:#F4F7FB;--surface-1:#FFFFFF;--surface-2:#F6F8FC;--surface-3:#EDF2F8;
  --text-primary:#0B1422;--text-secondary:#536176;--text-muted:#7C899B;
  --border:rgba(13,31,55,.09);--border-hover:rgba(13,31,55,.18);--accent:#5867E8;--accent-2:#159D90;
}
body.v26-premium{
  background:
    radial-gradient(900px 560px at 78% -12%,color-mix(in srgb,var(--accent) 15%,transparent),transparent 62%),
    radial-gradient(720px 460px at -10% 18%,color-mix(in srgb,var(--accent-2) 8%,transparent),transparent 66%),
    var(--bg);
  letter-spacing:-.008em;
}
body.v26-premium::before{
  content:"";position:fixed;inset:0;pointer-events:none;z-index:-1;opacity:.18;
  background-image:linear-gradient(rgba(255,255,255,.025) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.025) 1px,transparent 1px);
  background-size:44px 44px;mask-image:linear-gradient(to bottom,black,transparent 72%);
}
.v26-premium .mobile-header{
  background:color-mix(in srgb,var(--bg) 72%,transparent);
  -webkit-backdrop-filter:saturate(145%) blur(22px);backdrop-filter:saturate(145%) blur(22px);
  border-bottom-color:color-mix(in srgb,var(--border) 66%,transparent)
}
.v26-premium .header-inner{min-height:var(--header-height)}
.v26-premium .brand{display:inline-flex;align-items:center;font-size:16px;font-weight:820;letter-spacing:-.035em}
.v26-premium .brand-dot{width:11px;height:11px;background:linear-gradient(145deg,var(--accent),var(--accent-2));box-shadow:0 0 0 4px color-mix(in srgb,var(--accent) 10%,transparent),0 0 28px color-mix(in srgb,var(--accent) 46%,transparent)}
.v26-premium .icon-btn,.v26-premium .lang-btn{border:1px solid transparent;transition:background .18s ease,border-color .18s ease,color .18s ease}
.v26-premium .icon-btn:hover,.v26-premium .lang-btn:hover{border-color:var(--border);background:color-mix(in srgb,var(--surface-1) 88%,transparent)}
.v26-premium .v26-hero{min-height:min(700px,82svh);padding-top:72px;padding-bottom:44px;position:relative}
.v26-premium .v26-hero::after{content:"";position:absolute;right:2%;top:13%;width:210px;height:210px;border-radius:50%;background:radial-gradient(circle,color-mix(in srgb,var(--accent) 22%,transparent),transparent 66%);filter:blur(4px);pointer-events:none}
.v26-premium .hero .eyebrow,.v26-premium .page-hero .eyebrow{color:color-mix(in srgb,var(--accent-2) 74%,var(--text-secondary));font-weight:800;letter-spacing:.14em}
.v26-premium .hero h1{max-width:10ch;font-size:clamp(48px,10vw,76px);line-height:.98;letter-spacing:-.065em;text-wrap:balance}
.v26-premium .hero p{max-width:48ch;font-size:clamp(17px,2.1vw,20px);line-height:1.62}
.v26-premium .btn{min-height:52px;height:auto;border-radius:15px;padding:13px 19px;transition:transform .16s ease,box-shadow .16s ease,border-color .16s ease;background-clip:padding-box}
.v26-premium .btn-primary{background:linear-gradient(135deg,var(--accent),#675BEA 58%,#5D6CF2);box-shadow:0 14px 42px color-mix(in srgb,var(--accent) 24%,transparent)}
.v26-premium .btn-primary:hover{transform:translateY(-1px);box-shadow:0 18px 48px color-mix(in srgb,var(--accent) 30%,transparent)}
.v26-premium .btn-secondary{background:color-mix(in srgb,var(--surface-1) 86%,transparent);border-color:var(--border)}
.v26-proof-strip{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin-top:26px;max-width:640px}
.v26-proof-item{padding:14px 15px;border:1px solid var(--border);border-radius:16px;background:linear-gradient(155deg,color-mix(in srgb,var(--surface-1) 88%,transparent),color-mix(in srgb,var(--surface-2) 74%,transparent));box-shadow:0 12px 34px rgba(0,0,0,.08)}
.v26-proof-item strong{display:block;font-size:22px;letter-spacing:-.04em}.v26-proof-item span{display:block;margin-top:2px;color:var(--text-muted);font-size:11px;line-height:1.3}
.v26-premium .cap-strip{margin-top:24px;padding:2px 0 5px;gap:8px}.v26-premium .cap-strip span,.v26-premium .cap-strip a{border:1px solid var(--border);border-radius:999px;padding:8px 11px;background:color-mix(in srgb,var(--surface-1) 70%,transparent);font-size:12px;color:var(--text-secondary)}
.v26-premium .section{padding:46px 0}.v26-premium .section h2{font-size:clamp(25px,4vw,34px);letter-spacing:-.045em}.v26-premium .section-sub{max-width:62ch;line-height:1.65}
.v26-premium .tutorial-mini-card,.v26-premium .tool-guide-card,.v26-premium .course-card,.v26-premium .project-card,.v26-premium .v24-path-card,.v26-premium .v24-next-card,.v26-premium .v24-complete-card,.v26-premium .guide-sources,.v26-premium .outcome-card,.v26-premium .current-product-note,.v26-premium .guide-map-card,.v26-premium .v25-flagship-block{
  border-color:var(--border);background:linear-gradient(155deg,color-mix(in srgb,var(--surface-1) 94%,transparent),color-mix(in srgb,var(--surface-2) 78%,transparent));
  box-shadow:0 18px 48px rgba(0,0,0,.08)
}
.v26-premium .tutorial-mini-card,.v26-premium .tool-guide-card,.v26-premium .v24-path-card{transition:transform .18s ease,border-color .18s ease,box-shadow .18s ease}
.v26-premium .tutorial-mini-card:hover,.v26-premium .tool-guide-card:hover,.v26-premium .v24-path-card:hover{transform:translateY(-3px);border-color:color-mix(in srgb,var(--accent) 34%,var(--border));box-shadow:0 24px 60px rgba(0,0,0,.12)}
.v26-premium .tutorial-badge,.v26-premium .chip{background:color-mix(in srgb,var(--accent) 8%,var(--surface-2));border-color:color-mix(in srgb,var(--accent) 15%,var(--border));color:color-mix(in srgb,var(--accent) 72%,var(--text-primary))}
.v26-premium .page-hero{padding-top:54px;padding-bottom:30px;border-bottom:1px solid color-mix(in srgb,var(--border) 58%,transparent)}
.v26-premium .page-hero h1{font-size:clamp(36px,7vw,58px);letter-spacing:-.055em;max-width:15ch;text-wrap:balance}.v26-premium .page-hero p{max-width:58ch;font-size:17px;line-height:1.65}
.v26-premium .guide-prose{max-width:820px}.v26-premium .guide-prose>p,.v26-premium .guide-section>p{color:var(--text-secondary)}
.v26-premium .lesson-shell{max-width:820px}.v26-premium .lesson-body{font-size:17px}.v26-premium .lesson-topbar{background:color-mix(in srgb,var(--bg) 83%,transparent);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px)}
.v26-premium .footer,.v26-premium .trust-footer{border-top:1px solid var(--border);margin-top:48px;padding-top:34px;padding-bottom:calc(34px + env(safe-area-inset-bottom));color:var(--text-muted)}
.v26-premium .footer strong{color:var(--text-primary)}.v26-premium .footer a,.v26-premium .trust-footer a{transition:color .15s ease}.v26-premium .footer a:hover,.v26-premium .trust-footer a:hover{color:var(--text-primary)}
.v26-premium .privacy-control-panel{padding:22px 24px;margin:22px 0 42px;border:1px solid var(--border);border-radius:22px;background:linear-gradient(150deg,color-mix(in srgb,var(--accent-2) 5%,var(--surface-1)),var(--surface-1))}
.v26-premium .privacy-control-panel p{color:var(--text-secondary);margin-bottom:0}
@media(max-width:620px){
  .v26-premium .v26-hero{min-height:auto;padding-top:52px}.v26-premium .v26-hero::after{width:160px;height:160px;right:-20%;top:4%}
  .v26-premium .hero h1{font-size:clamp(44px,13vw,58px);max-width:9ch}.v26-premium .hero p{font-size:17px}
  .v26-proof-strip{grid-template-columns:repeat(3,minmax(0,1fr));gap:7px}.v26-proof-item{padding:12px 10px}.v26-proof-item strong{font-size:20px}.v26-proof-item span{font-size:10px}
  .v26-premium .section{padding:38px 0}.v26-premium .section-head{align-items:flex-start}.v26-premium .page-hero{padding-top:42px}
}
@media(prefers-reduced-motion:reduce){.v26-premium *{scroll-behavior:auto!important;transition:none!important}}

/* V26 — voluntary learning-goal survey */
.v26-survey-section{padding-top:12px;padding-bottom:18px}
.v26-survey-shell{position:relative;overflow:hidden;border:1px solid color-mix(in srgb,var(--accent) 18%,var(--border));border-radius:28px;background:linear-gradient(145deg,color-mix(in srgb,var(--surface-1) 97%,transparent),color-mix(in srgb,var(--surface-2) 86%,transparent));box-shadow:0 28px 80px rgba(0,0,0,.14)}
.v26-survey-shell::before{content:"";position:absolute;width:260px;height:260px;border-radius:50%;right:-110px;top:-120px;background:radial-gradient(circle,color-mix(in srgb,var(--accent) 20%,transparent),transparent 68%);pointer-events:none}
.v26-survey-inner{position:relative;padding:24px}
.v26-survey-top{display:flex;justify-content:space-between;align-items:flex-start;gap:18px;margin-bottom:18px}
.v26-survey-kicker{display:inline-flex;align-items:center;gap:7px;color:color-mix(in srgb,var(--accent-2) 80%,var(--text-primary));font-weight:820;font-size:11px;letter-spacing:.13em;text-transform:uppercase}
.v26-survey-title{font-size:clamp(24px,4vw,34px);line-height:1.08;letter-spacing:-.045em;margin:8px 0 8px;max-width:18ch}
.v26-survey-intro{max-width:62ch;color:var(--text-secondary);line-height:1.6;margin:0}
.v26-survey-privacy{display:flex;gap:8px;align-items:flex-start;margin-top:12px;color:var(--text-muted);font-size:12px;line-height:1.5;max-width:70ch}
.v26-survey-privacy::before{content:"●";color:var(--accent-2);font-size:9px;margin-top:3px}
.v26-survey-skip{flex:0 0 auto;background:none;border:0;color:var(--text-muted);min-height:44px;padding:8px 2px;text-decoration:underline;text-underline-offset:4px;cursor:pointer}
.v26-survey-progress{display:grid;grid-template-columns:repeat(4,1fr);gap:6px;margin:0 0 20px}
.v26-survey-progress span{height:4px;border-radius:999px;background:var(--surface-3);transition:background .18s ease,transform .18s ease}
.v26-survey-progress span.is-active{background:linear-gradient(90deg,var(--accent),var(--accent-2));transform:scaleY(1.2)}
.v26-survey-question{font-size:20px;line-height:1.25;letter-spacing:-.025em;margin:0 0 6px}
.v26-survey-help{margin:0 0 16px;color:var(--text-muted);font-size:13px;line-height:1.5}
.v26-survey-options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.v26-survey-option{min-height:58px;text-align:left;padding:13px 14px;border:1px solid var(--border);border-radius:15px;background:color-mix(in srgb,var(--surface-2) 76%,transparent);color:var(--text-primary);font:inherit;font-weight:700;line-height:1.35;cursor:pointer;transition:border-color .16s ease,background .16s ease,transform .16s ease;overflow-wrap:anywhere}
.v26-survey-option:hover{transform:translateY(-1px);border-color:color-mix(in srgb,var(--accent) 40%,var(--border));background:color-mix(in srgb,var(--accent) 7%,var(--surface-2))}
.v26-survey-option.is-selected{border-color:color-mix(in srgb,var(--accent) 60%,var(--border));background:linear-gradient(140deg,color-mix(in srgb,var(--accent) 14%,var(--surface-2)),color-mix(in srgb,var(--accent-2) 7%,var(--surface-2)));box-shadow:inset 0 0 0 1px color-mix(in srgb,var(--accent) 14%,transparent)}
.v26-survey-option:focus-visible,.v26-survey-skip:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.v26-survey-actions{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:20px}
.v26-survey-actions .btn{min-width:112px}
.v26-survey-step-label{font-size:12px;color:var(--text-muted)}
.v26-survey-summary{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:18px;align-items:center}
.v26-survey-summary h3{font-size:22px;letter-spacing:-.035em;margin:0 0 6px}
.v26-survey-summary p{margin:0;color:var(--text-secondary);line-height:1.55}
.v26-survey-tags{display:flex;gap:7px;flex-wrap:wrap;margin-top:12px}.v26-survey-tag{padding:6px 9px;border:1px solid var(--border);border-radius:999px;color:var(--text-secondary);font-size:11px;background:var(--surface-2)}
.v26-survey-status{margin-top:12px;font-size:12px;color:var(--text-muted)}
.v26-survey-status.is-ok{color:color-mix(in srgb,var(--accent-2) 82%,var(--text-primary))}
.v26-survey-status.is-warn{color:#D6A75D}
@media(max-width:620px){.v26-survey-section{padding-top:4px}.v26-survey-inner{padding:18px 16px}.v26-survey-top{gap:10px}.v26-survey-title{font-size:25px}.v26-survey-options{grid-template-columns:1fr}.v26-survey-option{min-height:54px}.v26-survey-summary{grid-template-columns:1fr}.v26-survey-summary .btn{width:100%}.v26-survey-actions{align-items:stretch}.v26-survey-actions .btn{flex:1;min-width:0;padding-left:10px;padding-right:10px}}
@media(hover:none){.v26-survey-option:hover{transform:none}}