/* Shared site palette, navigation, and editorial heroes. */

:root{color-scheme:dark;--bg:#0f172a;--bg-card:#1e293b;--text:#e2e8f0;--text-muted:#94a3b8;--blue:#38bdf8;--purple:#a78bfa;--green:#34d399;--orange:#f97316;--red:#f87171;--border:rgba(255,255,255,.1);--wash:rgba(56,189,248,.065);--shadow:0 24px 80px rgba(0,0,0,.18);--site-header-height:76px}
:root.light{color-scheme:light;--bg:#f8fafc;--bg-card:#fff;--text:#1e293b;--text-muted:#64748b;--blue:#2563eb;--purple:#7c3aed;--green:#059669;--orange:#ea580c;--red:#dc2626;--border:#e2e8f0;--wash:rgba(37,99,235,.045);--shadow:0 24px 65px rgba(30,41,59,.07)}
html{scroll-padding-top:calc(var(--site-header-height) + 24px)}
[hidden]{display:none!important}
:focus-visible{outline:3px solid var(--purple);outline-offset:4px}
.wrap{width:min(1240px,calc(100% - 96px));margin-inline:auto}
.eyebrow{font-size:10px;font-weight:700;letter-spacing:.17em;line-height:1.7;color:var(--blue)}
.skip-link{position:fixed;top:-100px;left:15px;background:var(--bg-card);padding:12px;z-index:100}
.skip-link:focus{top:10px}
.site-header{position:sticky;top:0;z-index:30;background:color-mix(in srgb,var(--bg) 94%,transparent);backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}
.site-nav{width:min(1380px,calc(100% - 64px));margin:auto;display:flex;align-items:center;gap:25px;min-height:76px}
.brand{display:flex;align-items:center;gap:12px;color:var(--text);font-size:14px;font-weight:700;white-space:nowrap}
.brand:hover{text-decoration:none}
.brand-mark{font-family:Georgia,serif;font-size:27px;color:var(--blue);border:1px solid var(--border);width:38px;height:38px;line-height:30px;text-align:center;border-radius:10px}
.brand-mark span{color:var(--purple)}
.nav-links{margin-left:auto;display:flex;gap:25px;font-size:12px;font-weight:500}
.nav-links a{color:var(--text-muted)}
.nav-links a[aria-current]{color:var(--text)}
.icon-button,.menu-button{background:transparent;border:1px solid var(--border);border-radius:9px;padding:6px 12px}
.icon-button{font-size:22px;line-height:1.4}
.menu-button{display:none}
.mobile-nav{padding:16px 24px;border-top:1px solid var(--border)}
.mobile-nav a{display:block;padding:8px}
.hero{display:grid;grid-template-columns:1.08fr 1fr;align-items:center;gap:70px;padding-top:78px;padding-bottom:64px}
.live-dot{display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--green);margin-right:8px}
.hero h1{font-size:clamp(40px,5.1vw,70px);font-weight:700;letter-spacing:-.065em;margin-top:24px;line-height:1.06}
.hero h1 span{color:var(--blue)}
.hero-intro{font-size:18px;line-height:1.65;margin-top:26px;letter-spacing:-.025em}
.hero-description{color:var(--text-muted);max-width:480px;font-size:14px;margin-top:14px;line-height:1.85}
.hero-actions{margin-top:30px;display:flex;flex-wrap:wrap;align-items:center;gap:14px}
.button{display:inline-flex;justify-content:center;align-items:center;gap:20px;font-size:12px;font-weight:600;border-radius:9px;padding:14px 20px;line-height:1.5;transition:transform .2s,box-shadow .2s}
.button:hover{text-decoration:none;transform:translateY(-2px)}
.primary{background:linear-gradient(135deg,#2563eb,#7c3aed);color:white;border:1px solid transparent;box-shadow:0 5px 20px rgba(37,99,235,.12)}
.secondary{border:1px solid var(--border);color:var(--text)}
.button span{font-size:18px}
.reassurance{font-size:11px;color:var(--text-muted)}
.collection-facts{margin-top:30px;display:flex;gap:24px;font-size:11px;color:var(--text-muted)}
.collection-facts strong{color:var(--text);font-size:14px;font-weight:600;margin-right:4px}
.hero-feature{background:linear-gradient(155deg,var(--bg-card),var(--bg));border:1px solid var(--border);border-radius:20px;padding:26px 28px 20px;box-shadow:var(--shadow);position:relative;overflow:hidden}
.hero-feature:before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--blue),var(--purple))}
.feature-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:25px}
.tiny-tag{font:10px JetBrains Mono,monospace;color:var(--text-muted);padding:3px 8px;border:1px solid var(--border);border-radius:20px}
.hero-feature h2{font-size:31px}
.hero-feature>p{font-size:12px;color:var(--text-muted);margin-top:12px;max-width:300px}
.hero-feature figcaption{display:flex;flex-direction:column;gap:14px;padding-top:12px;border-top:1px solid var(--border);font-size:11px}
.hero-feature figcaption a{align-self:flex-start;font-weight:600}
.feature-caption{color:var(--text-muted)}
@media (min-width:1500px){.hero{gap:100px}
.hero h1{font-size:74px}}
@media (max-width:1100px){.wrap{width:calc(100% - 64px)}
.hero{gap:35px}
.nav-links{gap:15px}
.site-nav{gap:15px}
.brand{font-size:12px}
.hero-actions{align-items:flex-start;flex-direction:column}
.collection-facts{gap:14px}}
@media (max-width:850px){.nav-links{display:none}
.icon-button{margin-left:auto}
.menu-button{display:block}
.hero{grid-template-columns:1fr;gap:35px;padding-top:45px}
.hero-copy{max-width:650px}
.hero h1{font-size:64px}
.hero-feature{max-width:620px;width:100%}
.hero-feature h2 br{display:none}
.hero-actions{flex-direction:row;align-items:center}}
@media (max-width:520px){.wrap{width:calc(100% - 36px)}
.site-nav{width:calc(100% - 28px);gap:10px;min-height:66px}
.brand{font-size:11px;gap:8px}
.brand-mark{width:30px;height:32px;font-size:23px}
.icon-button{font-size:19px;padding:5px 9px}
.menu-button{font-size:11px;padding:7px 9px}
.hero{padding-top:35px;padding-bottom:35px}
.hero h1{font-size:47px}
.hero-intro{font-size:16px}
.hero-description{font-size:13px}
.hero-actions{flex-direction:column;align-items:flex-start;gap:10px}
.collection-facts{flex-wrap:wrap;gap:10px 18px;font-size:10px}
.hero-feature{padding:22px 18px 18px}
.hero-feature h2{font-size:27px}
.eyebrow{font-size:9px}}
@media (prefers-reduced-motion:reduce){.button:hover{transform:none}}
@media print{.site-header,.hero-actions,.button{display:none!important}
.wrap{width:100%}
.hero{padding-top:0}}

/* Explicit shared type and sizing keep the header identical on Tailwind and plain HTML pages. */
.site-header{z-index:100;position:sticky;top:0;font:400 15px/1.7 Inter,system-ui,sans-serif}
.site-header *,.hero *{box-sizing:border-box}
.site-header a{text-decoration:none}
.site-header nav{background:transparent!important}
.site-nav{height:var(--site-header-height);min-height:var(--site-header-height);gap:22px}
.site-nav .brand{font-size:14px;line-height:1.4}
.site-nav .brand-mark{flex-shrink:0;line-height:30px}
.site-nav .nav-links{gap:23px;align-items:center}
.nav-links a{position:relative;white-space:nowrap;padding:10px 0;line-height:1.5}
.nav-links a:hover,.mobile-nav a:hover{color:var(--blue)}
.nav-links a[aria-current="page"]:after{content:"";height:2px;background:var(--blue);position:absolute;bottom:0;left:0;right:0;border-radius:2px}
.mobile-nav a{font-size:14px;color:var(--text-muted);padding:10px 12px;border-radius:7px}
.mobile-nav a[aria-current="page"]{background:var(--wash);color:var(--blue)}
.icon-button,.menu-button{font-family:inherit;color:var(--text);cursor:pointer;flex-shrink:0;min-height:44px;min-width:44px}
.icon-button:hover,.menu-button:hover{background:var(--wash);border-color:var(--blue)}
.skip-link{font:600 13px/1.5 Inter,system-ui,sans-serif;color:var(--blue);border-radius:8px;z-index:110}
.hero{font:400 15px/1.7 Inter,system-ui,sans-serif;isolation:isolate}
.hero h1,.hero h2,.hero p,.hero figure{margin-bottom:0}
.hero h1,.hero h2{font-weight:700}
.hero h2{line-height:1.18;letter-spacing:-.035em}
.hero .hero-copy,.hero .hero-feature{min-width:0}
.hero .hero-feature{margin:0}
.hero .eyebrow{margin-top:0}
.hero .button{line-height:1.5;text-decoration:none}
.hero .collection-facts{line-height:1.7}
.hero figcaption a,.hero-description a,.hero-text-link{color:var(--blue);text-decoration:none}
.hero figcaption a:hover,.hero-description a:hover,.hero-text-link:hover{text-decoration:underline}
.hero-text-link{font-size:12px;font-weight:600}
.hero .primary{color:#fff}
.hero .tiny-tag{white-space:nowrap}
.hero .hero-feature h2{margin-top:0}
.hero .hero-intro{color:var(--text)}
.hero .feature-top .eyebrow{font-size:9px}
.method-path{list-style:none;margin:25px 0 20px;padding:0;position:relative}
.method-path li+li{border-top:1px solid var(--border)}
.method-path a{display:flex;align-items:center;gap:13px;padding:13px 0;color:var(--text);text-decoration:none;border-radius:5px}
.method-path a:hover{background:var(--wash);text-decoration:none}
.method-index{width:28px;height:28px;border-radius:50%;border:1px solid var(--border);display:grid;place-items:center;font:10px JetBrains Mono,monospace;color:var(--purple);flex-shrink:0}
.method-path strong{font-size:12px;font-weight:600;display:block;line-height:1.5}
.method-path small{display:block;font-size:10px;color:var(--text-muted);margin-top:3px;line-height:1.5}
.method-code{margin-left:auto;white-space:nowrap;color:var(--blue);font:10px JetBrains Mono,monospace}
.curriculum-art{max-width:880px;margin:0 auto 40px}
.curriculum-cover{display:block;width:100%;height:auto;border:1px solid var(--border);border-radius:16px}
.dialogue{margin:26px 0 20px;display:flex;flex-direction:column;gap:16px}
.dialogue-turn{padding:16px 18px;border:1px solid var(--border);border-radius:12px;background:var(--bg)}
.dialogue-turn.student{margin-left:36px;border-bottom-right-radius:3px}
.dialogue-turn.coach{margin-right:20px;border-bottom-left-radius:3px;background:var(--wash);border-color:color-mix(in srgb,var(--blue) 20%,var(--border))}
.speaker{display:block;font:600 9px/1.5 Inter,system-ui,sans-serif;letter-spacing:.12em;color:var(--purple);margin-bottom:8px}
.coach .speaker{color:var(--blue)}
.dialogue-turn p{font-size:12px;line-height:1.85;color:var(--text);margin:0}
.dialogue-turn p+p{margin-top:12px}
.thinking-prompt{font-size:10px;color:var(--text-muted);display:flex;gap:10px;align-items:center}
.thinking-prompt span{color:var(--green);font-size:20px}
.preview-tabs{display:flex;border-bottom:1px solid var(--border);gap:5px;margin-top:26px}
.preview-tabs button{font:600 11px/1.5 Inter,system-ui,sans-serif;padding:11px 17px;border:0;border-bottom:2px solid transparent;color:var(--text-muted);background:transparent;cursor:pointer}
.preview-tabs button[aria-selected="true"]{border-bottom-color:var(--blue);color:var(--blue);background:var(--wash)}
.preview-panels{background:var(--bg);border:1px solid var(--border);border-top:0;border-radius:0 0 10px 10px;min-height:245px;margin-bottom:22px}
.preview-panels pre{padding:20px 18px;margin:0;white-space:pre-wrap;overflow-wrap:anywhere;font:11px/1.85 JetBrains Mono,monospace;color:var(--text)}
.preview-panels code{font:inherit;color:inherit}
/* Preserve lesson content while giving the supporting pages a calmer reading rhythm. */
.collection-heading{display:flex;justify-content:space-between;align-items:end;gap:24px;padding-top:50px;margin-bottom:32px;border-top:1px solid var(--border)}
.collection-heading h2{font-size:36px;line-height:1.2;letter-spacing:-.04em;font-weight:600;margin:12px 0 0}
.collection-heading>p{font-size:13px;line-height:1.8;color:var(--text-muted)}
.tutor-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
.tutor-card{position:relative;display:flex;flex-direction:column;padding:30px 32px;border-radius:16px;overflow:hidden;box-shadow:0 6px 25px rgba(0,0,0,.025)}
.tutor-card:before{content:"";height:2px;position:absolute;top:0;left:32px;right:32px;background:linear-gradient(90deg,var(--blue),var(--purple));opacity:.6}
.tutors-page .tutor-card:hover{transform:none;box-shadow:var(--shadow);border-color:color-mix(in srgb,var(--blue) 35%,var(--border))}
.tutor-card h3{font-size:23px;letter-spacing:-.035em;line-height:1.3}
.tutor-card>.text-sm{font-size:14px;line-height:1.9;margin-top:12px;margin-bottom:20px}
.tutor-card>.text-xs{line-height:1.85}
.tutor-card .tutor-icon{width:48px;height:48px;font-size:24px;border:1px solid var(--border);margin-bottom:20px}
.tutor-card .tag-pill{font-size:10px;padding:4px 9px;line-height:1.6}
.tutor-card .example-prompt{display:block;font-family:inherit;font-size:12px;padding:13px 15px;margin-top:7px;border-left:2px solid var(--purple);line-height:1.8}
.tutor-card .tutor-btn{margin-top:auto;align-self:flex-start;padding:11px 18px;font-size:12px;border:1px solid var(--border)}
.tutor-card:last-child{grid-column:1/-1;max-width:100%}
.tutor-collection{padding-bottom:32px;scroll-margin-top:calc(var(--site-header-height) + 20px)}
.cheatsheet-page .chapter-subnav{top:var(--site-header-height);z-index:90}
.cheatsheet-page :is(.chapter-section,#furious-five,#chapter-directory){scroll-margin-top:calc(var(--site-header-height) + 75px)}
.cheatsheet-page .chapter-section{padding-block:48px}
.cheatsheet-page .chapter-section>div,.cheatsheet-page .chapter-directory>div{max-width:1152px}
.cheatsheet-page .chapter-section h2{font-size:26px;line-height:1.3;letter-spacing:-.035em}
.cheatsheet-page .chapter-directory .card{border-radius:13px;padding:24px}
.cheatsheet-page .chapter-directory .card:hover{background:var(--wash);border-color:var(--blue)}
.cheatsheet-page .warning-banner{border-radius:14px;padding:26px 30px;line-height:1.9;background:color-mix(in srgb,var(--red) 4%,var(--bg-card))}
.cheatsheet-page .warning-banner h3{margin-bottom:14px}
.cheatsheet-page .warning-banner p{line-height:1.9}
.cheatsheet-page .lang-tabs{gap:4px;margin-top:24px}
.cheatsheet-page .lang-tab{padding:12px 22px;font-size:12px}
.cheatsheet-page .code-wrapper{box-shadow:0 8px 35px rgba(0,0,0,.07);border-radius:0 12px 12px 12px}
.cheatsheet-page .code-wrapper pre code.hljs{font-size:13px;line-height:1.85}
@media(min-width:1101px){.site-nav .nav-links{display:flex}.site-nav .menu-button{display:none}.mobile-nav{display:none}}
@media(max-width:1100px){.site-nav .nav-links{display:none}.site-nav .menu-button{display:block}.site-nav .icon-button{margin-left:auto}.hero .feature-top{gap:10px;flex-wrap:wrap}}
@media(max-width:850px){.hero-feature{max-width:none}.hero-copy{max-width:680px}.hero h1{font-size:64px}.hero{gap:38px}.tutor-grid{grid-template-columns:1fr}.collection-heading{align-items:start}.collection-heading h2{font-size:30px}.preview-panels{min-height:0}.tutor-card:last-child{grid-column:auto}.cheatsheet-page .chapter-subnav>div{overflow-x:auto;justify-content:flex-start;white-space:nowrap}}
@media(max-width:520px){:root{--site-header-height:66px}.site-nav{gap:8px}.site-nav .brand{font-size:10px;gap:7px;white-space:normal;max-width:165px}.site-nav .brand-mark{width:29px;height:31px;font-size:23px;line-height:25px}.site-nav .menu-button{font-size:11px;padding:6px 9px}.hero h1{font-size:46px}.hero .collection-facts{gap:10px 18px}.hero .hero-feature{padding:22px 18px 18px}.hero .hero-feature h2{font-size:27px}.hero .feature-top{margin-bottom:20px}.method-path a{gap:9px}.method-path strong{font-size:11px}.method-path small{font-size:10px}.method-code{font-size:9px}.dialogue-turn.student{margin-left:15px}.dialogue-turn.coach{margin-right:8px}.dialogue-turn{padding:14px}.collection-heading{display:block;padding-top:35px}.collection-heading>p{margin-top:15px}.collection-heading>p br{display:none}.collection-heading h2{font-size:28px}.tutor-card{padding:25px 22px}.preview-panels pre{font-size:10px;padding:16px 12px}.cheatsheet-page .warning-banner{padding:22px}.cheatsheet-page .chapter-section h2{font-size:22px}.cheatsheet-page .code-wrapper pre code.hljs{font-size:12px}.cheatsheet-page .lang-tab{padding:12px 18px}.cheatsheet-page .chapter-subnav .subnav-link{padding:8px 10px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto!important}*,*:before,*:after{animation:none!important;transition:none!important}}
@media print{.site-header,.skip-link{display:none!important}.hero{padding-top:0}.hero-feature{box-shadow:none}}
.preview-panels code.hljs{background:transparent;padding:0;white-space:inherit;overflow:visible;font:inherit}
/* Reuse the same compact header when CSS is loaded before Tailwind's runtime stylesheet. */
.site-header .mobile-nav[hidden]{display:none!important}
.cheatsheet-page .chapter-subnav{visibility:hidden;pointer-events:none}
.cheatsheet-page .chapter-subnav.visible{visibility:visible;pointer-events:auto}
.code-context{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin:24px 0 0;padding-top:18px;border-top:1px solid var(--border)}
.code-context dt{font-size:9px;text-transform:uppercase;letter-spacing:.1em;color:var(--text-muted)}
.code-context dd{font-size:11px;color:var(--text);margin:6px 0 0}
.preview-panels{min-height:160px}
@media(max-width:520px){.code-context{gap:8px}.code-context dd{font-size:10px}.code-context dt{font-size:8px}.preview-panels{min-height:150px}}
.tutor-card h3{color:var(--tutor-accent)}
.tutor-card:before{background:var(--tutor-accent)}
.tutor-card .example-prompt{border-left-color:var(--tutor-accent)}
.tutor-card .tutor-btn:hover{border-color:var(--tutor-accent)}
.light .tutor-card{--tutor-readable:color-mix(in srgb,var(--tutor-accent) 80%,var(--text))}
.light .tutor-card .tutor-btn,.light .tutor-card .tag-pill{color:var(--tutor-readable)!important}
.method-sketch{width:64px;height:30px;margin-left:auto;flex-shrink:0;fill:none;stroke:var(--blue);stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round;opacity:.8}
.method-sketch circle{fill:var(--bg-card)}
.method-sketch .sketch-secondary{stroke:var(--purple)}
.method-sketch .sketch-guide{stroke:var(--text-muted);stroke-dasharray:2 3;opacity:.5}
.method-sketch+.method-code{margin-left:0;width:38px;text-align:right}
@media(max-width:1100px) and (min-width:851px){.method-sketch{display:none}.method-sketch+.method-code{margin-left:auto}}
@media(max-width:520px){.method-sketch{display:none}.method-sketch+.method-code{margin-left:auto}}