:root{--paper:#f7f1e7;--paper-2:#efe7d9;--surface:#fffdf8;--surface-2:#f4eee4;--surface-3:#e9dfd0;--ink:#292820;--ink-soft:#4f4b40;--muted:#777165;--faint:#a69e8f;--line:#e4dac9;--gold:#b9894f;--gold-soft:#f2e5ce;--coral:#d76f56;--coral-soft:#f8e5de;--sage:#688e76;--sage-soft:#e2ece3;--lav:#9581b6;--lav-soft:#eee8f5;--blue:#6f8fa9;--blue-soft:#e4edf4;--shadow:0 20px 55px rgba(63,49,29,.09);--shadow-sm:0 8px 22px rgba(63,49,29,.07);--serif:'Playfair Display',Georgia,serif;--sans:'DM Sans',Arial,sans-serif;--mono:'DM Mono',monospace;--max:1200px;color-scheme:light}
html[data-theme=dark]{--paper:#191b17;--paper-2:#22251f;--surface:#242820;--surface-2:#2c3028;--surface-3:#353a30;--ink:#f1ecdf;--ink-soft:#d5cebe;--muted:#aaa391;--faint:#807a6d;--line:#3a3d33;--gold:#d5ad73;--gold-soft:#3c3326;--coral:#ee947a;--coral-soft:#3f2d28;--sage:#94b79b;--sage-soft:#28392f;--lav:#b8a5d5;--lav-soft:#342d3d;--blue:#9bb9d0;--blue-soft:#293744;--shadow:0 20px 55px rgba(0,0,0,.24);--shadow-sm:0 8px 22px rgba(0,0,0,.18);color-scheme:dark}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:90px}body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);line-height:1.65;-webkit-font-smoothing:antialiased;transition:background .25s,color .25s}button,input{font:inherit}button{cursor:pointer}button:focus-visible,input:focus-visible{outline:3px solid color-mix(in srgb,var(--coral) 65%,transparent);outline-offset:3px}a{color:inherit}.shell{width:min(var(--max),calc(100% - 52px));margin-inline:auto}.top-progress{height:3px;width:0;position:fixed;top:0;left:0;z-index:1000;background:linear-gradient(90deg,var(--coral),var(--gold),var(--sage));transition:width .1s}.site-header{position:sticky;top:0;z-index:100;background:color-mix(in srgb,var(--paper) 88%,transparent);backdrop-filter:blur(18px);border-bottom:1px solid color-mix(in srgb,var(--line) 75%,transparent)}.nav-shell{height:78px;display:flex;align-items:center;gap:28px}.brand{display:flex;align-items:center;gap:11px;border:0;background:transparent;color:var(--ink);padding:0;text-align:left;min-width:210px}.brand-mark{width:45px;height:45px;border-radius:13px;background:#15130f;border:1px solid rgba(202,165,106,.38);display:grid;place-items:center;overflow:hidden}.brand-mark img{width:100%;height:100%;object-fit:cover}.brand-copy strong{display:block;font:700 18px var(--serif);letter-spacing:.09em}.brand-copy small{display:block;margin-top:2px;font:500 8px var(--mono);letter-spacing:.17em;color:var(--gold)}.desktop-nav{display:flex;gap:7px;align-items:center;margin-left:auto}.nav-link{border:0;background:transparent;padding:10px 13px;border-radius:999px;color:var(--muted);font-size:12px;font-weight:700;transition:background .2s,color .2s}.nav-link:hover,.nav-link.active{background:var(--surface-2);color:var(--ink)}.lock-dot{font:500 7px var(--mono);letter-spacing:.06em;color:var(--muted);border:1px solid var(--line);border-radius:999px;padding:3px 5px;margin-left:3px}.nav-tools{display:flex;align-items:center;gap:8px}.language-toggle,.theme-toggle,.mobile-menu{height:39px;border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:999px;display:flex;align-items:center;justify-content:center;gap:7px;box-shadow:var(--shadow-sm)}.language-toggle{padding:0 12px;font:500 9px var(--mono);letter-spacing:.05em}.language-symbol{font-family:var(--sans);font-size:13px;color:var(--gold)}.chevron{font-size:14px;color:var(--muted)}.theme-toggle,.mobile-menu{width:39px;padding:0}.theme-toggle svg{width:17px;height:17px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}.mobile-menu{display:none;border-radius:11px;flex-direction:column;gap:4px}.mobile-menu span{width:15px;height:1.5px;background:currentColor}.mobile-nav{display:none;padding:8px 25px 16px;background:var(--paper);border-top:1px solid var(--line)}.mobile-nav.open{display:grid}.mobile-nav button{border:0;background:transparent;text-align:left;padding:12px 0;color:var(--ink);font-size:13px;border-bottom:1px solid var(--line)}
/* Home */
.hero{position:relative;overflow:hidden;padding:64px 0 72px;background:var(--paper-2);isolation:isolate}.hero:before{content:"";position:absolute;z-index:-1;width:620px;height:620px;border:1px solid color-mix(in srgb,var(--gold) 23%,transparent);border-radius:50%;right:-90px;top:-300px;box-shadow:0 0 0 26px color-mix(in srgb,var(--coral) 3%,transparent),0 0 0 62px color-mix(in srgb,var(--gold) 4%,transparent)}.hero:after{content:"";position:absolute;z-index:-1;left:-180px;bottom:-270px;width:470px;height:470px;border-radius:50%;background:radial-gradient(circle,color-mix(in srgb,var(--sage) 16%,transparent),transparent 70%)}.hero-grid{display:grid;grid-template-columns:1.08fr .92fr;align-items:center;gap:58px}.eyebrow{font:500 9px var(--mono);letter-spacing:.18em;text-transform:uppercase;color:var(--gold)}.hero-kicker{display:inline-flex;align-items:center;gap:10px;padding:8px 12px;border:1px solid color-mix(in srgb,var(--gold) 35%,transparent);border-radius:999px;background:color-mix(in srgb,var(--surface) 66%,transparent);font:500 8px var(--mono);letter-spacing:.13em;text-transform:uppercase;color:var(--muted)}.hero-kicker:before{content:"";width:7px;height:7px;border-radius:50%;background:var(--sage);box-shadow:0 0 0 5px var(--sage-soft)}.hero h1{font:600 clamp(48px,6.6vw,82px)/.99 var(--serif);letter-spacing:-.045em;margin:22px 0 19px;max-width:700px}.hero h1 em{font-style:normal;color:var(--coral)}.hero-copy{max-width:590px;color:var(--ink-soft);font-size:14px;line-height:1.9;margin:0}.hero-subline{display:flex;align-items:center;gap:10px;margin-top:20px;font:500 8px var(--mono);letter-spacing:.09em;text-transform:uppercase;color:var(--muted)}.hero-subline:before{content:"";height:1px;width:28px;background:var(--gold)}.hero-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;min-height:45px;padding:0 18px;border-radius:999px;border:1px solid transparent;font-size:11px;font-weight:800;letter-spacing:.01em;transition:transform .2s,box-shadow .2s,background .2s}.btn:hover{transform:translateY(-2px)}.btn-primary{background:var(--ink);color:var(--paper);box-shadow:var(--shadow-sm)}.btn-primary:hover{box-shadow:var(--shadow)}.btn-secondary{background:var(--surface);border-color:var(--line);color:var(--ink)}.btn-quiet{background:transparent;border-color:var(--line);color:var(--ink)}.btn-small{min-height:37px;padding:0 14px;font-size:9px}.btn:disabled{opacity:.4;cursor:not-allowed;transform:none}.icon{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;flex:none}.hero-art{position:relative;max-width:510px;margin-left:auto;width:100%;padding:25px 16px 28px}.hero-brand-card{position:relative;z-index:1;background:#100f0c;border:1px solid rgba(219,183,125,.42);padding:9px;border-radius:24px;box-shadow:0 28px 70px rgba(45,31,15,.24);transform:rotate(1.1deg);transition:transform .5s}.hero-brand-card:hover{transform:rotate(0deg) translateY(-4px)}.hero-brand-card picture,.hero-brand-card img{display:block;width:100%;border-radius:17px}.hero-brand-card img{height:auto}.float-note{position:absolute;z-index:2;background:var(--surface);border:1px solid var(--line);border-radius:15px;padding:11px 14px;box-shadow:var(--shadow);font-size:9px;color:var(--muted)}.float-note strong{display:block;color:var(--ink);font:600 14px var(--serif)}.float-note.top{top:-1px;left:-11px;transform:rotate(-4deg)}.float-note.bottom{right:-10px;bottom:1px;transform:rotate(3deg)}.float-note .tiny-dot{display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--sage);margin-right:5px}.hero-side-caption{position:absolute;right:5%;top:50%;writing-mode:vertical-rl;font:500 7px var(--mono);letter-spacing:.24em;color:var(--faint);transform:translateY(-50%)}.section{padding:74px 0}.section-head{display:flex;align-items:end;justify-content:space-between;gap:30px;margin-bottom:27px}.section-head h2{font:600 clamp(32px,4.3vw,48px)/1.08 var(--serif);letter-spacing:-.035em;margin:9px 0 0}.section-head p{max-width:460px;margin:0;color:var(--muted);font-size:12px;line-height:1.85}.section-kicker{font:500 8px var(--mono);letter-spacing:.17em;text-transform:uppercase;color:var(--gold)}.method-section{padding-top:60px}.method-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:13px}.method-card{min-height:190px;position:relative;background:var(--surface);border:1px solid var(--line);border-radius:19px;padding:19px;overflow:hidden;transition:transform .22s,box-shadow .22s}.method-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-sm)}.method-index{font:500 8px var(--mono);letter-spacing:.13em;color:var(--gold)}.method-icon{display:grid;place-items:center;width:40px;height:40px;margin:21px 0 12px;border-radius:13px;background:var(--sage-soft);color:var(--sage)}.method-card:nth-child(2) .method-icon{background:var(--lav-soft);color:var(--lav)}.method-card:nth-child(3) .method-icon{background:var(--coral-soft);color:var(--coral)}.method-card:nth-child(4) .method-icon{background:var(--gold-soft);color:var(--gold)}.method-card h3{font:600 19px var(--serif);margin:0 0 5px}.method-card p{font-size:10px;line-height:1.7;color:var(--muted);margin:0}
.course-section{padding-top:60px;background:color-mix(in srgb,var(--surface) 35%,var(--paper))}.course-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:13px}.course-card{position:relative;display:flex;flex-direction:column;min-height:220px;text-align:left;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:22px;padding:16px;overflow:hidden;transition:transform .22s,box-shadow .22s,border-color .22s}.course-card:not(.locked):hover{transform:translateY(-5px);box-shadow:var(--shadow);border-color:var(--gold)}.course-card.locked{cursor:not-allowed;opacity:.82}.course-top{display:flex;justify-content:space-between;align-items:start;gap:8px}.course-art{width:64px;height:64px;border-radius:19px;display:grid;place-items:center;overflow:hidden}.course-art svg{width:48px;height:48px;overflow:visible}.course-art.python{background:#e7edf4}.course-art.numpy{background:var(--lav-soft)}.course-art.pandas{background:var(--sage-soft)}.course-art.sql{background:var(--blue-soft)}.course-art.seaborn{background:var(--coral-soft)}.course-art.matplotlib{background:var(--gold-soft)}.course-art.statistics{background:var(--lav-soft)}.course-art.ml{background:var(--sage-soft)}.course-art.dl{background:var(--blue-soft)}.course-art.genai{background:var(--coral-soft)}.course-status{font:500 7px var(--mono);letter-spacing:.08em;text-transform:uppercase;border-radius:999px;padding:5px 7px;background:var(--surface-2);color:var(--muted);white-space:nowrap}.course-status.available{background:var(--sage-soft);color:var(--sage)}.course-status.locked{display:inline-flex;align-items:center;gap:4px}.course-card h3{font:600 19px var(--serif);margin:16px 0 5px}.course-card p{font-size:10px;line-height:1.65;color:var(--muted);margin:0}.course-bottom{display:flex;align-items:center;justify-content:space-between;margin-top:auto;padding-top:15px;font:500 8px var(--mono);letter-spacing:.11em;text-transform:uppercase;color:var(--gold)}.course-arrow{width:27px;height:27px;display:grid;place-items:center;border-radius:50%;background:var(--surface-2);transition:transform .2s}.course-card:not(.locked):hover .course-arrow{transform:translateX(3px);background:var(--gold-soft)}.course-card.locked .course-bottom{color:var(--muted)}
.pillars-section{padding-top:76px}.pillars-grid{display:grid;grid-template-columns:1fr 1fr;gap:17px}.pillar-card{position:relative;min-height:300px;border-radius:25px;padding:26px;overflow:hidden;border:1px solid var(--line);background:var(--surface)}.pillar-card.learn{background:var(--sage-soft);border-color:color-mix(in srgb,var(--sage) 30%,var(--line))}.pillar-card.labs{background:var(--surface-2)}.pillar-top{display:flex;align-items:center;justify-content:space-between;position:relative;z-index:1}.pillar-symbol{width:43px;height:43px;border-radius:14px;background:color-mix(in srgb,var(--surface) 75%,transparent);color:var(--sage);display:grid;place-items:center}.pillar-card.labs .pillar-symbol{color:var(--lav)}.pill{display:inline-flex;align-items:center;gap:5px;border-radius:999px;padding:5px 9px;background:color-mix(in srgb,var(--surface) 80%,transparent);color:var(--sage);font:500 7px var(--mono);letter-spacing:.08em;text-transform:uppercase}.pill.muted{color:var(--muted);background:var(--surface-3)}.pillar-art{position:absolute;width:160px;height:160px;right:25px;top:70px;color:color-mix(in srgb,var(--sage) 65%,transparent);opacity:.7}.pillar-card.labs .pillar-art{color:var(--lav);opacity:.55}.pillar-copy{position:relative;z-index:1;margin-top:115px;max-width:470px}.pillar-copy h3{font:600 27px var(--serif);margin:0 0 7px}.pillar-copy p{font-size:11px;line-height:1.8;color:var(--muted);max-width:430px}.pillar-link{display:inline-flex;align-items:center;gap:7px;border:0;background:transparent;color:var(--ink);padding:7px 0;font-size:10px;font-weight:800}.tracker-callout{position:relative;display:grid;grid-template-columns:1.1fr .9fr;gap:30px;align-items:center;border-radius:25px;padding:28px;background:var(--surface);border:1px solid var(--line);overflow:hidden}.tracker-callout:after{content:"";position:absolute;right:-100px;top:-150px;width:330px;height:330px;border:1px solid color-mix(in srgb,var(--sage) 30%,transparent);border-radius:50%;box-shadow:0 0 0 18px color-mix(in srgb,var(--sage) 4%,transparent),0 0 0 42px color-mix(in srgb,var(--gold) 3%,transparent);pointer-events:none}.tracker-callout h2{font:600 clamp(30px,4vw,45px) var(--serif);margin:8px 0 10px}.tracker-callout p{max-width:520px;margin:0;color:var(--muted);font-size:11px;line-height:1.85}.tracker-mini{position:relative;z-index:1;padding:17px;background:var(--surface-2);border:1px solid var(--line);border-radius:18px}.mini-row{display:flex;align-items:center;gap:10px;padding:8px 0;color:var(--ink-soft);font-size:10px}.mini-check{width:17px;height:17px;border:1px solid var(--sage);border-radius:5px;display:grid;place-items:center;color:var(--sage);font-size:11px;flex:none}.mini-check.done{background:var(--sage);color:white}.mini-row.done span:last-child{text-decoration:line-through;color:var(--muted)}
/* Generic pages */
.page{padding:44px 0 76px;min-height:65vh}.page-enter{animation:pageIn .35s ease both}@keyframes pageIn{from{opacity:0;transform:translateY(9px)}to{opacity:1;transform:translateY(0)}}.back-link{display:inline-flex;align-items:center;gap:8px;margin-bottom:22px;padding:6px 0;border:0;background:transparent;color:var(--muted);font-size:10px;font-weight:700}.back-link:hover{color:var(--ink)}.page-heading{display:flex;align-items:end;justify-content:space-between;gap:25px;margin-bottom:25px}.page-heading h1,.tracker-hero h1,.about-hero h1{font:600 clamp(37px,5vw,58px)/1.03 var(--serif);letter-spacing:-.04em;margin:8px 0 12px}.page-heading p{max-width:690px;color:var(--muted);font-size:11px;line-height:1.85;margin:0}.stat-chip{display:inline-flex;align-items:center;gap:7px;padding:10px 13px;background:var(--surface);border:1px solid var(--line);border-radius:13px;color:var(--muted);font:500 8px var(--mono);letter-spacing:.06em;white-space:nowrap}.stat-chip strong{color:var(--ink)}.library-intro{display:flex;align-items:start;gap:10px;padding:13px 15px;border-radius:13px;background:var(--gold-soft);color:var(--ink-soft);font-size:10px;line-height:1.75;margin:0 0 36px}.course-group{margin-top:35px}.group-head{display:flex;align-items:center;gap:14px;margin-bottom:15px}.group-number{font:500 22px var(--serif);color:var(--gold)}.group-head h2{font:600 25px var(--serif);margin:0}.group-head p{margin:2px 0 0;color:var(--muted);font-size:10px}.topic-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.topic-card{display:flex;align-items:center;gap:13px;width:100%;min-height:88px;text-align:left;background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:13px;color:var(--ink);transition:transform .2s,border-color .2s,box-shadow .2s}.topic-card:hover{transform:translateY(-3px);border-color:var(--gold);box-shadow:var(--shadow-sm)}.folder-icon{width:43px;height:43px;display:grid;place-items:center;border-radius:13px;background:var(--gold-soft);color:var(--gold);flex:none}.topic-card-copy{display:flex;flex-direction:column;min-width:0;gap:3px}.topic-card-copy strong{font:600 15px/1.25 var(--serif)}.topic-card-copy small{font:500 7px var(--mono);color:var(--muted);letter-spacing:.08em;text-transform:uppercase}.topic-card-meta{display:flex;align-items:center;justify-content:space-between;gap:7px;color:var(--sage);font:500 7px var(--mono);letter-spacing:.1em}.done-dot{display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--sage);margin-right:4px}
/* Welcome */
.welcome-panel{display:grid;grid-template-columns:.9fr 1.1fr;gap:50px;align-items:center;padding:26px;border:1px solid var(--line);background:var(--surface);border-radius:26px;box-shadow:var(--shadow-sm)}.welcome-emblem{background:#100f0c;border:1px solid rgba(219,183,125,.35);padding:8px;border-radius:21px;overflow:hidden}.welcome-emblem img{display:block;width:100%;height:auto;border-radius:15px}.welcome-copy h1{font:600 clamp(40px,5vw,58px)/1.02 var(--serif);letter-spacing:-.04em;margin:10px 0}.welcome-copy p{font-size:11px;line-height:1.85;color:var(--muted);max-width:520px}.language-cards{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:13px 0 18px}.language-card{border:1px solid var(--line);background:var(--surface-2);color:var(--ink);border-radius:14px;padding:14px;text-align:left;transition:border .2s,transform .2s}.language-card.selected{border-color:var(--gold);box-shadow:inset 0 0 0 1px var(--gold);background:var(--gold-soft)}.language-card strong{display:block;font:600 17px var(--serif)}.language-card span{display:block;font-size:9px;color:var(--muted);margin-top:4px}
/* Lesson */
.lesson-top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:20px}.breadcrumbs{display:flex;align-items:center;flex-wrap:wrap;gap:7px;color:var(--muted);font:500 8px var(--mono);letter-spacing:.03em}.breadcrumbs button{border:0;padding:0;background:transparent;color:var(--gold);font:inherit}.lesson-hero{display:grid;grid-template-columns:1.05fr .95fr;gap:19px;margin-bottom:17px}.lesson-title-panel{background:var(--surface);border:1px solid var(--line);border-radius:23px;padding:clamp(20px,3vw,32px)}.lesson-title-panel h1{font:600 clamp(32px,4.3vw,51px)/1.04 var(--serif);letter-spacing:-.04em;margin:9px 0}.lesson-title-panel p{font-size:12px;line-height:1.9;color:var(--muted);margin:0}.lesson-tags{display:flex;flex-wrap:wrap;gap:7px;margin-top:18px}.lesson-visual-panel{position:relative;min-height:220px;display:flex;flex-direction:column;justify-content:center;align-items:center;background:var(--surface-2);border:1px solid var(--line);border-radius:23px;padding:17px;overflow:hidden}.lesson-visual-panel:before{content:"";position:absolute;width:210px;height:210px;border:1px solid var(--line);border-radius:50%;opacity:.6}.visual-caption{position:absolute;top:16px;left:18px;font:500 7px var(--mono);letter-spacing:.16em;color:var(--muted)}.topic-visual{position:relative;z-index:1;width:min(100%,390px);height:auto;overflow:visible}.teacher-panel{display:flex;align-items:start;gap:13px;padding:16px 18px;border-radius:16px;background:var(--sage-soft);border:1px solid color-mix(in srgb,var(--sage) 25%,var(--line));margin:18px 0 12px}.teacher-icon{width:35px;height:35px;display:grid;place-items:center;border-radius:11px;background:color-mix(in srgb,var(--surface) 70%,transparent);color:var(--sage);flex:none}.teacher-panel h2{font:600 19px var(--serif);margin:0 0 3px}.teacher-panel p{font-size:10px;line-height:1.75;color:var(--muted);margin:0}.key-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:9px;margin:12px 0 23px}.key-card{padding:15px;border-radius:15px;background:var(--surface);border:1px solid var(--line)}.key-num{font:500 7px var(--mono);letter-spacing:.12em;color:var(--gold)}.key-card p{font-size:10px;line-height:1.7;margin:7px 0 0;color:var(--ink-soft)}.notebook-details{border:1px solid var(--line);background:var(--surface);border-radius:17px;margin:21px 0;overflow:hidden}.notebook-details summary{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:16px 18px;cursor:pointer;list-style:none;font:600 16px var(--serif)}.notebook-details summary::-webkit-details-marker{display:none}.notebook-details summary:after{content:"＋";color:var(--gold);font:500 18px var(--sans)}.notebook-details[open] summary:after{content:"−"}.notebook-note{padding:0 20px 22px;border-top:1px solid var(--line);font-size:11px;line-height:1.8;color:var(--ink-soft)}.notebook-note h2,.notebook-note h3{font-family:var(--serif);color:var(--ink)}.notebook-note h2{font-size:24px;margin:23px 0 8px}.notebook-note h3{font-size:19px;margin:20px 0 7px}.notebook-note p{margin:10px 0}.notebook-note table{width:100%;border-collapse:collapse;display:block;overflow-x:auto;margin:12px 0}.notebook-note th,.notebook-note td{padding:8px 10px;border:1px solid var(--line);text-align:left;min-width:85px}.notebook-note th{background:var(--surface-2);font-size:9px}.notebook-note pre{overflow-x:auto;padding:14px;background:var(--surface-2);border:1px solid var(--line);border-radius:12px;font:10px/1.7 var(--mono);color:var(--ink-soft)}.notebook-code{border:1px solid var(--line);border-radius:13px;overflow:hidden;margin:13px 0;background:var(--surface-2)}.notebook-code-head{display:flex;align-items:center;justify-content:space-between;padding:9px 12px;border-bottom:1px solid var(--line);font:500 7px var(--mono);letter-spacing:.12em;color:var(--muted)}.copy-code{border:1px solid var(--line);background:var(--surface);color:var(--muted);padding:5px 9px;border-radius:7px;font:500 7px var(--mono)}.notebook-code pre{margin:0;border:0;background:transparent;border-radius:0}.source-links{display:flex;flex-wrap:wrap;align-items:center;gap:9px;margin:20px 0}.source-links a{font-size:9px;text-decoration:none;padding:7px 10px;border:1px solid var(--line);background:var(--surface);border-radius:999px;color:var(--muted)}.source-links a:hover{color:var(--ink);border-color:var(--gold)}.language-source-note{margin:11px 0;color:var(--muted);font-size:9px;line-height:1.7}
/* Quiz */
.quiz-panel{border:1px solid var(--line);border-radius:23px;background:var(--surface);overflow:hidden;margin:29px 0}.quiz-head{display:flex;align-items:center;justify-content:space-between;gap:15px;padding:22px 24px;background:var(--surface-2);border-bottom:1px solid var(--line)}.quiz-head h2{font:600 29px var(--serif);margin:5px 0}.quiz-head p{margin:0;color:var(--muted);font-size:10px}.quiz-body{padding:22px 24px}.quiz-question{padding:17px 0;border-bottom:1px solid var(--line)}.quiz-question:last-of-type{border-bottom:0}.quiz-q-meta{font:500 7px var(--mono);letter-spacing:.16em;color:var(--gold)}.quiz-question h3{font:600 18px/1.4 var(--serif);margin:8px 0 12px}.quiz-options{display:grid;grid-template-columns:1fr 1fr;gap:8px}.quiz-option{display:flex;align-items:center;gap:10px;padding:10px 12px;border:1px solid var(--line);background:var(--surface-2);border-radius:12px;color:var(--ink-soft);text-align:left;font-size:10px;line-height:1.55;transition:border .15s,background .15s}.quiz-option:hover:not(:disabled){border-color:var(--gold);background:var(--gold-soft)}.quiz-option.selected{border-color:var(--gold);background:var(--gold-soft);color:var(--ink)}.quiz-option.correct{border-color:var(--sage);background:var(--sage-soft);color:var(--ink)}.quiz-option.wrong{border-color:var(--coral);background:var(--coral-soft);color:var(--ink)}.quiz-option:disabled{cursor:default}.option-dot{width:23px;height:23px;display:grid;place-items:center;border-radius:50%;background:var(--surface);border:1px solid var(--line);font:500 8px var(--mono);flex:none}.quiz-feedback{display:none;margin-top:9px;padding:10px 12px;border-radius:10px;background:var(--surface-2);color:var(--muted);font-size:9px;line-height:1.7}.quiz-feedback.show{display:block;animation:pageIn .25s ease}.quiz-actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:20px}.notice-inline{font-size:9px;color:var(--coral)}.quiz-result{display:none;padding:17px 24px;border-top:1px solid var(--line);background:var(--sage-soft);color:var(--ink)}.quiz-result.show{display:block;animation:pageIn .25s ease}.quiz-result strong{font:600 24px var(--serif)}.quiz-result p{font-size:10px;line-height:1.7;color:var(--muted);margin:3px 0 0}.lesson-bottom{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:18px 0}.lesson-bottom p{font-size:9px;color:var(--muted);line-height:1.7}.lesson-actions{display:flex;align-items:center;gap:7px;flex-wrap:wrap}
/* Tracker */
.tracker-hero{display:flex;align-items:end;justify-content:space-between;gap:18px;margin-bottom:23px}.tracker-hero p{max-width:640px;color:var(--muted);font-size:11px;line-height:1.8;margin:0}.tracker-card{border:1px solid var(--line);background:var(--surface);border-radius:23px;padding:clamp(17px,3vw,26px);box-shadow:var(--shadow-sm)}.tracker-toolbar{display:flex;align-items:end;justify-content:space-between;gap:14px;flex-wrap:wrap;margin-bottom:19px}.field-label{display:block;margin-bottom:6px;color:var(--muted);font:500 8px var(--mono);letter-spacing:.1em;text-transform:uppercase}.date-field,.task-input{border:1px solid var(--line);border-radius:11px;background:var(--surface-2);color:var(--ink);padding:11px 12px;min-height:42px;font-size:11px}.task-input{width:100%}.add-task-form{display:grid;grid-template-columns:1fr 150px auto;gap:9px;align-items:end}.tracker-progress{margin:18px 0 15px}.tracker-progress-top{display:flex;justify-content:space-between;color:var(--muted);font-size:9px;margin-bottom:7px}.progress-track{height:9px;background:var(--surface-3);border-radius:999px;overflow:hidden}.progress-fill{height:100%;width:0;background:linear-gradient(90deg,var(--sage),var(--gold));border-radius:999px;transition:width .25s}.tracker-filters{display:flex;align-items:center;gap:7px;margin:19px 0 9px;flex-wrap:wrap}.filter-btn{border:1px solid var(--line);background:transparent;color:var(--muted);border-radius:999px;padding:7px 11px;font:500 8px var(--mono)}.filter-btn.active{background:var(--gold-soft);border-color:var(--gold);color:var(--gold)}.task-list{display:grid;gap:8px}.task-row{display:flex;align-items:center;gap:11px;padding:12px;border:1px solid var(--line);background:var(--surface-2);border-radius:13px}.task-check{width:21px;height:21px;flex:none;border:1.5px solid var(--muted);border-radius:7px;background:var(--surface);display:grid;place-items:center;color:white;padding:0;font-size:13px}.task-check.done{background:var(--sage);border-color:var(--sage)}.task-name{flex:1;min-width:0;color:var(--ink);font-size:11px;overflow-wrap:anywhere}.task-name.done{text-decoration:line-through;color:var(--muted)}.task-date-label{color:var(--muted);font:500 7px var(--mono)}.delete-task{width:29px;height:29px;border:0;border-radius:8px;background:transparent;color:var(--muted);font-size:18px}.delete-task:hover{background:var(--coral-soft);color:var(--coral)}.empty-state{padding:38px 15px;text-align:center;border:1px dashed var(--line);border-radius:15px;color:var(--muted);font-size:11px}.tracker-note{margin-top:14px;padding:11px 13px;border-radius:11px;background:var(--gold-soft);color:var(--ink-soft);font-size:9px;line-height:1.65;display:flex;gap:8px;align-items:flex-start}.tracker-date-summary{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:20px 0 8px}.tracker-date-summary h2{font:600 21px var(--serif);margin:0}.tracker-date-summary span{font:500 8px var(--mono);color:var(--muted)}
/* Other pages/footer */
.locked-panel{max-width:760px;margin:35px auto;padding:clamp(24px,5vw,50px);text-align:center;border-radius:26px;border:1px solid var(--line);background:var(--surface);box-shadow:var(--shadow-sm)}.locked-symbol{width:58px;height:58px;border-radius:18px;background:var(--lav-soft);color:var(--lav);display:grid;place-items:center;margin:0 auto 16px}.locked-panel h1{font:600 clamp(35px,5vw,53px)/1.05 var(--serif);margin:9px 0}.locked-panel p{max-width:560px;margin:0 auto 18px;color:var(--muted);font-size:11px;line-height:1.85}.about-hero{display:grid;grid-template-columns:1.2fr .8fr;gap:35px;align-items:center;padding:24px;border:1px solid var(--line);border-radius:24px;background:var(--surface);margin-bottom:35px}.about-hero p{max-width:650px;color:var(--muted);font-size:12px;line-height:1.9}.about-logo{background:#100f0c;border:1px solid rgba(219,183,125,.35);border-radius:17px;padding:7px;overflow:hidden}.about-logo img{width:100%;display:block;border-radius:11px}.about-pillar-grid{display:grid;grid-template-columns:1fr 1fr;gap:13px}.about-pillar{padding:22px;border:1px solid var(--line);border-radius:18px;background:var(--surface)}.about-pillar h3{font:600 23px var(--serif);margin:11px 0 5px}.about-pillar p{color:var(--muted);font-size:10px;line-height:1.8}.site-footer{border-top:1px solid var(--line);padding:27px 0 33px;background:var(--paper-2)}.footer-inner{display:flex;align-items:center;gap:18px}.footer-brand{display:flex;align-items:center;gap:9px}.footer-brand img{width:35px;height:35px;object-fit:cover;border-radius:10px;background:#100f0c}.footer-brand strong{display:block;font:700 14px var(--serif);letter-spacing:.09em}.footer-brand small{display:block;color:var(--gold);font:500 6px var(--mono);letter-spacing:.16em}.footer-note{margin-left:auto;text-align:right;color:var(--muted);font-size:9px;line-height:1.7}.footer-note span{color:var(--faint)}.back-top{width:33px;height:33px;border-radius:50%;border:1px solid var(--line);background:var(--surface);color:var(--muted);font-size:15px}.toast{position:fixed;z-index:1000;left:50%;bottom:23px;transform:translate(-50%,15px);opacity:0;pointer-events:none;background:var(--ink);color:var(--paper);padding:11px 17px;border-radius:999px;box-shadow:var(--shadow);font-size:10px;transition:opacity .2s,transform .2s;max-width:calc(100% - 36px);text-align:center}.toast.show{opacity:1;transform:translate(-50%,0)}
@media(max-width:1050px){.course-grid{grid-template-columns:repeat(3,1fr)}.hero-grid{gap:32px}.course-card{min-height:205px}}
@media(max-width:760px){.shell{width:min(var(--max),calc(100% - 34px))}.nav-shell{height:68px;gap:12px}.brand{min-width:0}.brand-mark{width:39px;height:39px}.brand-copy strong{font-size:16px}.brand-copy small{font-size:6px}.desktop-nav{display:none}.nav-tools{margin-left:auto}.language-toggle,.theme-toggle,.mobile-menu{height:36px}.theme-toggle,.mobile-menu{width:36px}.mobile-menu{display:flex}.hero{padding:44px 0 50px}.hero-grid{grid-template-columns:1fr;gap:25px}.hero h1{font-size:clamp(44px,11vw,68px)}.hero-copy{font-size:12px}.hero-art{max-width:440px;margin:auto}.hero-brand-card{border-radius:20px}.hero-brand-card picture,.hero-brand-card img{border-radius:14px}.section{padding:51px 0}.section-head{display:block}.section-head p{margin-top:11px}.method-grid{grid-template-columns:repeat(2,1fr)}.course-grid{grid-template-columns:repeat(2,1fr);gap:9px}.course-card{min-height:194px;padding:13px}.course-card h3{font-size:17px}.course-art{width:55px;height:55px;border-radius:16px}.course-art svg{width:42px;height:42px}.course-status{font-size:6px}.pillars-grid,.tracker-callout{grid-template-columns:1fr}.pillar-card{min-height:255px}.tracker-callout{padding:21px}.page{padding:29px 0 52px}.page-heading{display:block}.stat-chip{display:inline-flex;margin-top:13px}.welcome-panel{grid-template-columns:1fr;gap:22px;padding:17px}.welcome-emblem{max-width:350px;margin:auto}.welcome-copy h1{font-size:43px}.lesson-hero{grid-template-columns:1fr}.lesson-visual-panel{min-height:205px}.key-grid{grid-template-columns:1fr 1fr}.topic-grid{grid-template-columns:1fr 1fr}.topic-card{min-height:86px}.about-hero{grid-template-columns:1fr;gap:22px}.about-logo{max-width:400px;margin:auto}.tracker-hero{display:block}.tracker-hero .pill{margin-top:12px}.footer-inner{align-items:flex-start;flex-wrap:wrap}.footer-note{text-align:left;margin-left:0;width:100%}}
@media(max-width:500px){.method-grid{grid-template-columns:1fr 1fr}.method-card{min-height:168px;padding:14px}.method-icon{margin:14px 0 9px}.course-grid{grid-template-columns:1fr 1fr}.course-card{min-height:185px}.course-card p{font-size:9px}.topic-grid{grid-template-columns:1fr}.topic-card{min-height:84px}.key-grid{grid-template-columns:1fr}.quiz-options{grid-template-columns:1fr}.quiz-head{align-items:flex-start;flex-direction:column}.lesson-bottom{align-items:flex-start;flex-direction:column}.language-cards{grid-template-columns:1fr 1fr}.about-pillar-grid{grid-template-columns:1fr}.add-task-form{grid-template-columns:1fr}.tracker-toolbar{align-items:stretch;flex-direction:column}.date-field{width:100%}.lesson-actions{width:100%}.lesson-actions .btn{flex:1}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}
.search-box{display:flex;align-items:center;gap:10px;padding:10px 13px;margin:18px 0 19px;border:1px solid var(--line);background:var(--surface);border-radius:13px;color:var(--gold)}.search-box input{flex:1;min-width:0;border:0;outline:0;background:transparent;color:var(--ink);font:500 11px var(--sans)}.search-box input::placeholder{color:var(--faint)}.search-count{font:500 7px var(--mono);letter-spacing:.1em;color:var(--muted);white-space:nowrap}.group-count{margin-left:auto;color:var(--muted);font:500 7px var(--mono);letter-spacing:.12em}
/* Topic-specific visual choreography */
.visual-node{opacity:0;transform-box:fill-box;transform-origin:center;animation:visualNodeIn .55s cubic-bezier(.2,.75,.25,1) calc(var(--node-order,0)*85ms) forwards}
@keyframes visualNodeIn{from{opacity:0;transform:translateY(8px) scale(.97)}to{opacity:1;transform:translateY(0) scale(1)}}
.topic-visual circle[stroke-dasharray]{animation:visualOrbit 15s linear infinite;transform-origin:center}
@keyframes visualOrbit{to{transform:rotate(360deg)}}
@media(prefers-reduced-motion:reduce){.visual-node,.topic-visual circle[stroke-dasharray]{animation:none!important;opacity:1!important;transform:none!important}}

/* ==========================================================
   VAKSHARA VISUAL REFINEMENT — V5
   Warm editorial identity, vivid subject colours, richer motion
   ========================================================== */
:root{
  --paper:#f8f3e9;
  --paper-2:#efe5d5;
  --surface:#fffdf8;
  --surface-2:#f6eee2;
  --surface-3:#e9ddcb;
  --ink:#28251f;
  --ink-soft:#514b40;
  --muted:#777064;
  --faint:#a79d8d;
  --line:#e5d9c7;
  --gold:#b77b39;
  --gold-soft:#f3e4cb;
  --coral:#dc7056;
  --coral-soft:#f9e4dc;
  --sage:#5f8c70;
  --sage-soft:#e1eee3;
  --lav:#8f79b3;
  --lav-soft:#eee8f7;
  --blue:#6388a5;
  --blue-soft:#e4eef5;
  --shadow:0 24px 70px rgba(65,47,23,.12);
  --shadow-sm:0 10px 28px rgba(65,47,23,.08);
}
html[data-theme=dark]{
  --paper:#171a16;
  --paper-2:#22251e;
  --surface:#252920;
  --surface-2:#2d3228;
  --surface-3:#3a4034;
  --ink:#f3eddf;
  --ink-soft:#ded5c4;
  --muted:#b1a895;
  --faint:#888171;
  --line:#404438;
  --gold:#dfb875;
  --gold-soft:#403522;
  --coral:#f09579;
  --coral-soft:#462f28;
  --sage:#9cc4a5;
  --sage-soft:#293b30;
  --lav:#c0a9e4;
  --lav-soft:#372f43;
  --blue:#a1c5df;
  --blue-soft:#293b49;
  --shadow:0 26px 75px rgba(0,0,0,.32);
  --shadow-sm:0 12px 30px rgba(0,0,0,.23);
}
body{font-size:15px;line-height:1.7;letter-spacing:.002em}
.shell{width:min(1260px,calc(100% - 64px))}
.site-header{background:color-mix(in srgb,var(--paper) 90%,transparent);box-shadow:0 5px 24px rgba(35,27,16,.035)}
.nav-shell{height:82px;gap:32px}
.brand-mark{width:49px;height:49px;border-radius:15px;box-shadow:0 5px 18px rgba(12,10,7,.13)}
.brand-copy strong{font-size:19px;letter-spacing:.105em}
.brand-copy small{font-size:8px;letter-spacing:.19em}
.desktop-nav{gap:5px}
.nav-link{font-size:13px;padding:11px 15px}
.language-toggle,.theme-toggle,.mobile-menu{height:42px}
.theme-toggle,.mobile-menu{width:42px}
.language-toggle{font-size:10px}

/* The hero now feels like a distinct brand campaign, not a plain title block. */
.hero{padding:72px 0 82px;background:linear-gradient(125deg,#f3e7d7 0%,#f7f0e5 48%,#e8eee2 100%);border-bottom:1px solid color-mix(in srgb,var(--gold) 22%,var(--line))}
html[data-theme=dark] .hero{background:linear-gradient(125deg,#292319 0%,#22251e 49%,#1c2a23 100%)}
.hero:before{width:690px;height:690px;right:-150px;top:-345px;border-color:color-mix(in srgb,var(--gold) 32%,transparent);box-shadow:0 0 0 28px color-mix(in srgb,var(--coral) 5%,transparent),0 0 0 70px color-mix(in srgb,var(--gold) 5%,transparent),0 0 0 120px color-mix(in srgb,var(--sage) 4%,transparent);animation:heroHalo 24s linear infinite}
.hero:after{width:560px;height:560px;left:-210px;bottom:-355px;background:radial-gradient(circle,color-mix(in srgb,var(--coral) 20%,transparent),color-mix(in srgb,var(--gold) 7%,transparent) 46%,transparent 72%);animation:glowDrift 13s ease-in-out infinite alternate}
.hero-grid{grid-template-columns:1.02fr .98fr;gap:52px;min-height:510px}
.hero-content{position:relative;z-index:2;padding:12px 0}
.hero-kicker{font-size:9px;letter-spacing:.18em;padding:9px 14px;background:color-mix(in srgb,var(--surface) 78%,transparent);box-shadow:0 5px 20px rgba(68,47,21,.04)}
.hero-kicker:before{width:8px;height:8px;box-shadow:0 0 0 6px var(--sage-soft);animation:statusPulse 2.5s ease-in-out infinite}
.hero h1{font-size:clamp(54px,6.4vw,88px);line-height:.98;letter-spacing:-.055em;margin:25px 0 22px;max-width:720px;text-wrap:balance}
.hero h1 em{color:var(--coral);background:linear-gradient(95deg,var(--coral),var(--gold));background-clip:text;-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.hero-copy{max-width:620px;font-size:16px;line-height:1.85;color:var(--ink-soft)}
.hero-subline{margin-top:23px;font-size:9px;letter-spacing:.1em}
.hero-actions{gap:12px;margin-top:31px}
.btn{min-height:50px;padding:0 21px;font-size:12px;border-radius:999px;transition:transform .28s cubic-bezier(.2,.8,.2,1),box-shadow .28s,border-color .28s,background .28s}
.btn-primary{background:linear-gradient(120deg,#2c3026,#454b38);color:#fffaf0;box-shadow:0 12px 26px rgba(39,43,32,.18)}
html[data-theme=dark] .btn-primary{background:linear-gradient(120deg,#d7b77e,#b78b4d);color:#211d16}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 18px 32px rgba(39,43,32,.22)}
.btn-secondary{background:color-mix(in srgb,var(--surface) 86%,transparent);border-color:color-mix(in srgb,var(--gold) 25%,var(--line))}
.btn-secondary:hover{transform:translateY(-3px);border-color:var(--gold);box-shadow:var(--shadow-sm)}
.hero-highlights{display:flex;flex-wrap:wrap;gap:10px 18px;margin-top:28px;color:var(--muted);font-size:11px;font-weight:700}
.hero-highlights span{display:inline-flex;align-items:center;gap:7px}
.hero-highlights .icon{width:15px;height:15px;color:var(--sage)}

/* A layered brand canvas: the supplied logo stays untouched in the centre. */
.hero-art{height:510px;max-width:590px;padding:0;display:grid;place-items:center;isolation:isolate}
.hero-art-glow{position:absolute;z-index:-2;width:78%;aspect-ratio:1;border-radius:50%;background:radial-gradient(circle,color-mix(in srgb,var(--gold) 20%,transparent),color-mix(in srgb,var(--coral) 9%,transparent) 44%,transparent 72%);filter:blur(3px);animation:glowDrift 10s ease-in-out infinite alternate}
.hero-orbit{position:absolute;z-index:-1;left:50%;top:50%;border:1px solid color-mix(in srgb,var(--gold) 35%,transparent);border-radius:50%;transform:translate(-50%,-50%);pointer-events:none}
.hero-orbit-one{width:92%;height:82%;animation:orbitBreathe 8s ease-in-out infinite}
.hero-orbit-two{width:72%;height:105%;border-style:dashed;border-color:color-mix(in srgb,var(--sage) 27%,transparent);animation:orbitSpin 65s linear infinite}
.hero-brand-card{width:min(74%,410px);margin:0;padding:8px;border-radius:24px;transform:rotate(-1.2deg);box-shadow:0 32px 80px rgba(35,26,15,.28),0 0 0 1px rgba(255,255,255,.18) inset;animation:brandFloat 6.5s ease-in-out infinite}
.hero-brand-card:hover{transform:rotate(0) translateY(-7px) scale(1.015)}
.hero-brand-card img{border-radius:17px}
.hero-chip{position:absolute;z-index:3;display:grid;grid-template-columns:40px auto;grid-template-rows:auto auto;column-gap:9px;align-items:center;min-width:126px;padding:10px 13px;border:1px solid color-mix(in srgb,var(--line) 75%,transparent);border-radius:17px;background:color-mix(in srgb,var(--surface) 91%,transparent);box-shadow:0 16px 40px rgba(44,34,21,.13);backdrop-filter:blur(14px);animation:chipFloat 5.8s ease-in-out infinite}
.hero-chip span{grid-row:1/3;width:39px;height:39px;display:grid;place-items:center;border-radius:12px;background:var(--surface-2)}
.hero-chip span svg{width:34px;height:34px}
.hero-chip b{font:700 12px var(--sans);color:var(--ink)}
.hero-chip small{font:500 8px var(--mono);letter-spacing:.08em;color:var(--muted)}
.hero-chip-python{left:0;top:10%;animation-delay:-.5s}
.hero-chip-sql{right:-1%;top:24%;animation-delay:-1.8s}
.hero-chip-data{left:1%;bottom:17%;animation-delay:-3s}
.hero-chip-ai{right:1%;bottom:8%;animation-delay:-4.2s}
.hero-note{position:absolute;z-index:4;left:30%;bottom:0;display:flex;align-items:center;gap:10px;padding:12px 16px;border:1px solid var(--line);border-radius:15px;background:var(--surface);box-shadow:var(--shadow);animation:noteFloat 6s ease-in-out infinite}
.hero-note-dot{width:9px;height:9px;flex:none;border-radius:50%;background:var(--sage);box-shadow:0 0 0 5px var(--sage-soft)}
.hero-note small{display:block;font:500 7px var(--mono);letter-spacing:.12em;color:var(--gold)}
.hero-note strong{display:block;margin-top:2px;font:600 14px var(--serif);color:var(--ink)}
.hero-side-caption{right:-1%;font-size:8px;letter-spacing:.2em}

/* Section rhythm and typography */
.section{padding:88px 0}
.section-head{margin-bottom:34px;gap:40px}
.section-head h2{font-size:clamp(36px,4.3vw,54px);line-height:1.04;margin-top:11px}
.section-head p{font-size:14px;line-height:1.8;color:var(--muted)}
.section-kicker{font-size:9px;letter-spacing:.18em}
.method-section{padding-top:75px;padding-bottom:86px}
.method-grid{gap:16px}
.method-card{min-height:230px;padding:23px;border-radius:23px;box-shadow:0 8px 24px rgba(53,42,26,.035)}
.method-card:nth-child(1){background:linear-gradient(145deg,var(--surface),color-mix(in srgb,var(--sage-soft) 58%,var(--surface)))}
.method-card:nth-child(2){background:linear-gradient(145deg,var(--surface),color-mix(in srgb,var(--lav-soft) 62%,var(--surface)))}
.method-card:nth-child(3){background:linear-gradient(145deg,var(--surface),color-mix(in srgb,var(--coral-soft) 58%,var(--surface)))}
.method-card:nth-child(4){background:linear-gradient(145deg,var(--surface),color-mix(in srgb,var(--gold-soft) 58%,var(--surface)))}
.method-card:hover{transform:translateY(-7px);box-shadow:var(--shadow-sm);border-color:color-mix(in srgb,var(--gold) 40%,var(--line))}
.method-index{font-size:9px;letter-spacing:.15em}
.method-icon{width:48px;height:48px;margin:23px 0 14px;border-radius:16px;box-shadow:0 7px 18px rgba(62,48,29,.07)}
.method-icon .icon{width:21px;height:21px}
.method-card h3{font-size:22px;margin-bottom:7px}
.method-card p{font-size:12px;line-height:1.75;max-width:230px}
.method-watermark{position:absolute;right:12px;bottom:-21px;font:700 112px/.9 var(--serif);letter-spacing:-.08em;color:color-mix(in srgb,var(--gold) 10%,transparent);pointer-events:none;transition:transform .35s,color .35s}
.method-card:hover .method-watermark{transform:translateY(-7px) rotate(-5deg);color:color-mix(in srgb,var(--gold) 18%,transparent)}

/* Subject library: bigger subject marks, individual colour personality. */
.course-section{padding:85px 0 92px;background:linear-gradient(180deg,color-mix(in srgb,var(--surface) 55%,var(--paper)),var(--paper))}
.course-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:17px}
.course-card{min-height:258px;padding:21px;border-radius:24px;background:var(--surface);box-shadow:0 9px 28px rgba(54,43,27,.045);isolation:isolate}
.course-card:before{content:"";position:absolute;z-index:-1;width:180px;height:180px;right:-75px;top:-82px;border-radius:50%;background:var(--surface-2);opacity:.9;transition:transform .45s cubic-bezier(.2,.8,.2,1),opacity .45s}
.course-card:not(.locked):hover{transform:translateY(-8px);box-shadow:0 24px 45px rgba(56,43,25,.13);border-color:color-mix(in srgb,var(--gold) 60%,var(--line))}
.course-card:not(.locked):hover:before{transform:scale(1.5);opacity:.75}
.course-card.locked{opacity:.87;filter:saturate(.86)}
.course-top{align-items:center}
.course-art{width:76px;height:76px;border-radius:23px;box-shadow:0 8px 20px rgba(35,31,24,.055);transition:transform .35s cubic-bezier(.2,.8,.2,1),box-shadow .35s}
.course-art svg{width:57px;height:57px;filter:drop-shadow(0 4px 3px rgba(36,31,25,.10));transition:transform .4s}
.course-card:hover .course-art{transform:translateY(-4px) rotate(-5deg) scale(1.04);box-shadow:0 12px 24px rgba(35,31,24,.1)}
.course-card:hover .course-art svg{transform:scale(1.07) rotate(4deg)}
.course-status{font-size:8px;letter-spacing:.09em;padding:7px 9px}
.course-status.available{box-shadow:inset 0 0 0 1px color-mix(in srgb,var(--sage) 22%,transparent)}
.course-card h3{font-size:23px;margin:20px 0 7px;letter-spacing:-.02em}
.course-card p{font-size:12px;line-height:1.75;max-width:240px}
.course-bottom{font-size:8px;padding-top:20px;letter-spacing:.13em}
.course-arrow{width:32px;height:32px;font-size:15px}
.course-card.locked .course-arrow{opacity:.8}

/* Learn and Labs become two unmistakable product cards. */
.pillars-section{padding:90px 0 88px}
.pillars-grid{gap:19px}
.pillar-card{min-height:340px;padding:30px;border-radius:28px;transition:transform .3s,box-shadow .3s}
.pillar-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-sm)}
.pillar-card.learn{background:linear-gradient(140deg,var(--sage-soft),color-mix(in srgb,var(--gold-soft) 35%,var(--sage-soft)))}
.pillar-card.labs{background:linear-gradient(140deg,var(--surface-2),color-mix(in srgb,var(--lav-soft) 55%,var(--surface-2)))}
.pillar-symbol{width:49px;height:49px;border-radius:16px;box-shadow:0 8px 20px rgba(45,37,25,.07)}
.pillar-symbol .icon{width:21px;height:21px}
.pillar-art{width:190px;height:190px;right:18px;top:62px;animation:artFloat 7s ease-in-out infinite}
.pillar-card.labs .pillar-art{animation-delay:-3s}
.pillar-copy{margin-top:130px;max-width:500px}
.pillar-copy h3{font-size:31px}
.pillar-copy p{font-size:13px;line-height:1.8}
.pillar-link{font-size:12px;padding:9px 0;transition:gap .2s}
.pillar-link:hover{gap:13px;color:var(--gold)}

/* Self tracker callout feels like a useful product feature. */
.tracker-section-home{padding-top:10px;padding-bottom:100px}
.tracker-callout{grid-template-columns:1.08fr .92fr;gap:38px;min-height:300px;padding:38px;border-radius:29px;background:linear-gradient(125deg,var(--surface),color-mix(in srgb,var(--sage-soft) 42%,var(--surface)));box-shadow:var(--shadow-sm)}
.tracker-callout h2{font-size:clamp(34px,4vw,49px);line-height:1.06;letter-spacing:-.035em;margin:10px 0 12px}
.tracker-callout p{font-size:13px;line-height:1.85;max-width:510px}
.tracker-callout-copy .btn{margin-top:22px}
.tracker-mini{padding:20px 22px;border-radius:21px;background:color-mix(in srgb,var(--surface) 80%,transparent);box-shadow:0 12px 32px rgba(40,35,25,.06)}
.tracker-mini-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:9px}
.tracker-mini-date{font:500 8px var(--mono);letter-spacing:.13em;color:var(--muted);padding:6px 9px;border-radius:999px;background:var(--surface-2)}
.mini-row{padding:12px 0;font-size:12px;border-bottom:1px solid var(--line)}
.mini-row small{margin-left:auto;font:500 7px var(--mono);letter-spacing:.09em;color:var(--muted)}
.mini-check{width:20px;height:20px;border-radius:7px}
.mini-progress{display:flex;align-items:center;gap:10px;margin-top:16px}
.mini-progress span{height:7px;flex:1;border-radius:999px;background:linear-gradient(90deg,var(--sage) 0 66%,var(--surface-3) 66%)}
.mini-progress b{font:500 7px var(--mono);letter-spacing:.08em;color:var(--sage);white-space:nowrap}
.tracker-mini-stats{display:flex;flex-wrap:wrap;gap:9px 18px;margin-top:19px;color:var(--muted);font-size:10px}
.tracker-mini-stats span{display:flex;align-items:center;gap:6px}
.tracker-mini-stats strong{color:var(--gold);font:500 9px var(--mono)}
.tracker-orbit{position:absolute;right:-120px;top:-180px;width:350px;height:350px;border:1px solid color-mix(in srgb,var(--sage) 23%,transparent);border-radius:50%;box-shadow:0 0 0 23px color-mix(in srgb,var(--sage) 4%,transparent),0 0 0 54px color-mix(in srgb,var(--gold) 4%,transparent);pointer-events:none;animation:orbitBreathe 10s ease-in-out infinite}

/* Inner pages: more readable, calm and consistent. */
.page{padding:48px 0 86px}
.page-enter{animation:pageIn .55s cubic-bezier(.2,.75,.25,1) both}
.back-link{font-size:12px;margin-bottom:25px}
.page-heading h1,.tracker-hero h1,.about-hero h1{font-size:clamp(40px,5vw,64px)}
.page-heading p{font-size:14px;line-height:1.85}
.stat-chip{font-size:9px;padding:12px 15px}
.library-intro{font-size:12px;line-height:1.8;padding:15px 17px;border-radius:16px}
.group-head{margin-bottom:19px}
.group-head h2{font-size:29px}
.group-head p{font-size:12px}
.group-number{font-size:27px}
.group-count{font-size:8px}
.topic-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.topic-card{min-height:104px;padding:16px;border-radius:19px}
.topic-card:hover{transform:translateY(-5px) scale(1.005)}
.folder-icon{width:49px;height:49px;border-radius:15px}
.topic-card-copy strong{font-size:17px}
.topic-card-copy small{font-size:8px;letter-spacing:.08em}
.topic-card-meta{font-size:8px}
.welcome-panel{gap:46px;padding:34px;border-radius:30px;box-shadow:var(--shadow)}
.welcome-copy h1{font-size:clamp(43px,5vw,65px)}
.welcome-copy p{font-size:14px;line-height:1.85}
.language-card{padding:17px;border-radius:17px}
.language-card strong{font-size:20px}
.language-card span{font-size:11px;line-height:1.6}
.lesson-top{margin-bottom:23px}
.breadcrumbs{font-size:10px}
.lesson-title-panel{padding:clamp(23px,3vw,38px);border-radius:27px}
.lesson-title-panel h1{font-size:clamp(37px,4.5vw,58px)}
.lesson-title-panel p{font-size:14px;line-height:1.85}
.lesson-visual-panel{border-radius:27px;min-height:280px}
.teacher-panel{padding:19px 21px;border-radius:19px}
.teacher-panel h2{font-size:22px}
.teacher-panel p{font-size:12px}
.key-grid{gap:12px}
.key-card{padding:18px;border-radius:17px}
.key-num{font-size:8px}
.key-card p{font-size:12px;line-height:1.8}
.notebook-details{border-radius:19px}
.notebook-details summary{font-size:18px;padding:19px 21px}
.notebook-note{font-size:13px;line-height:1.9;padding:0 23px 24px}
.notebook-note h2{font-size:28px}
.notebook-note h3{font-size:22px}
.notebook-note pre{font-size:12px;line-height:1.75;padding:17px}
.notebook-code-head{font-size:8px}
.copy-code{font-size:8px}
.source-links a{font-size:11px;padding:9px 13px}
.quiz-panel{border-radius:26px;box-shadow:var(--shadow-sm)}
.quiz-head{padding:27px 29px}
.quiz-head h2{font-size:34px}
.quiz-head p{font-size:13px;line-height:1.7}
.quiz-body{padding:25px 29px}
.quiz-question{padding:22px 0}
.quiz-q-meta{font-size:8px}
.quiz-question h3{font-size:21px;line-height:1.4}
.quiz-options{gap:11px}
.quiz-option{font-size:13px;line-height:1.65;padding:13px 15px;border-radius:14px}
.option-dot{width:27px;height:27px;font-size:9px}
.quiz-feedback{font-size:12px;line-height:1.8;padding:13px 15px}
.quiz-result strong{font-size:31px}
.quiz-result p{font-size:12px}
.lesson-bottom p{font-size:11px}

/* Self Tracker becomes more spacious and clear. */
.tracker-hero p{font-size:14px;line-height:1.85}
.tracker-card{border-radius:27px;padding:clamp(22px,3vw,34px);box-shadow:var(--shadow-sm)}
.tracker-toolbar{margin-bottom:24px}
.field-label{font-size:9px}
.date-field,.task-input{font-size:13px;min-height:48px;padding:12px 14px;border-radius:13px}
.add-task-form{gap:12px}
.tracker-progress-top{font-size:11px}
.progress-track{height:11px}
.tracker-date-summary h2{font-size:25px}
.filter-btn{font-size:9px;padding:9px 13px}
.task-row{padding:14px;border-radius:15px}
.task-name{font-size:13px}
.task-date-label{font-size:8px}
.tracker-note{font-size:11px;padding:13px 15px;border-radius:13px}
.empty-state{font-size:13px;padding:48px 18px}

/* About, Labs and footer. */
.locked-panel{padding:clamp(30px,5vw,58px);border-radius:30px}
.locked-panel p{font-size:14px;line-height:1.9}
.about-hero{padding:31px;border-radius:28px;box-shadow:var(--shadow-sm)}
.about-hero p{font-size:14px;line-height:1.9}
.about-pillar{padding:26px;border-radius:21px}
.about-pillar h3{font-size:27px}
.about-pillar p{font-size:13px;line-height:1.85}
.site-footer{padding:34px 0 39px}
.footer-brand img{width:43px;height:43px}
.footer-brand strong{font-size:16px}
.footer-brand small{font-size:7px}
.footer-note{font-size:11px}
.back-top{width:39px;height:39px}
.toast{font-size:12px;padding:13px 19px}

/* Motion: gentle entrances, floating accents and tactile cards. */
@keyframes pageIn{from{opacity:0;transform:translateY(15px)}to{opacity:1;transform:translateY(0)}}
@keyframes heroHalo{to{transform:rotate(360deg)}}
@keyframes glowDrift{0%{transform:translate3d(-7px,5px,0) scale(.96)}100%{transform:translate3d(12px,-9px,0) scale(1.06)}}
@keyframes orbitBreathe{0%,100%{transform:translate(-50%,-50%) scale(.98);opacity:.7}50%{transform:translate(-50%,-50%) scale(1.025);opacity:1}}
@keyframes orbitSpin{to{transform:translate(-50%,-50%) rotate(360deg)}}
@keyframes brandFloat{0%,100%{transform:translateY(0) rotate(-1.2deg)}50%{transform:translateY(-9px) rotate(.3deg)}}
@keyframes chipFloat{0%,100%{transform:translateY(0) rotate(0)}50%{transform:translateY(-9px) rotate(1.5deg)}}
@keyframes noteFloat{0%,100%{transform:translateY(0)}50%{transform:translateY(-6px)}}
@keyframes artFloat{0%,100%{transform:translateY(0) rotate(0)}50%{transform:translateY(-10px) rotate(3deg)}}
@keyframes statusPulse{0%,100%{box-shadow:0 0 0 5px var(--sage-soft)}50%{box-shadow:0 0 0 8px color-mix(in srgb,var(--sage) 13%,transparent)}}
.reveal-up{opacity:0;transform:translateY(22px);transition:opacity .7s cubic-bezier(.2,.75,.25,1),transform .7s cubic-bezier(.2,.75,.25,1);transition-delay:var(--reveal-delay,0ms)}
.reveal-up.is-visible{opacity:1;transform:translateY(0)}
.course-card.reveal-up{transition-property:opacity,transform,box-shadow,border-color}

/* Responsive balance */
@media(max-width:1100px){
  .course-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
  .hero-grid{gap:28px}
  .hero-art{height:470px}
  .hero-brand-card{width:73%}
  .hero-chip{min-width:112px;padding:8px 10px;grid-template-columns:34px auto}
  .hero-chip span{width:34px;height:34px}
  .hero-chip span svg{width:29px;height:29px}
}
@media(max-width:760px){
  .shell{width:min(var(--max),calc(100% - 36px))}
  .nav-shell{height:70px;gap:11px}
  .hero{padding:49px 0 58px}
  .hero-grid{grid-template-columns:1fr;gap:22px;min-height:0}
  .hero-content{padding:0}
  .hero h1{font-size:clamp(47px,10.5vw,70px);margin:21px 0 17px}
  .hero-copy{font-size:14px;line-height:1.8}
  .hero-highlights{gap:9px 14px;font-size:10px}
  .hero-art{height:410px;max-width:500px;margin:4px auto 0}
  .hero-brand-card{width:69%;max-width:340px}
  .hero-chip-python{left:1%;top:8%}
  .hero-chip-sql{right:0;top:20%}
  .hero-chip-data{left:0;bottom:15%}
  .hero-chip-ai{right:0;bottom:8%}
  .hero-note{left:27%;bottom:-3px;padding:10px 13px}
  .hero-note strong{font-size:12px}
  .hero-side-caption{display:none}
  .section{padding:65px 0}
  .section-head{display:block;margin-bottom:26px}
  .section-head p{font-size:13px;margin-top:13px}
  .method-section{padding-top:62px}
  .method-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:11px}
  .method-card{min-height:215px;padding:17px;border-radius:19px}
  .method-card h3{font-size:20px}
  .method-card p{font-size:11px}
  .method-watermark{font-size:92px}
  .course-section{padding:65px 0}
  .course-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:11px}
  .course-card{min-height:238px;padding:16px;border-radius:19px}
  .course-art{width:62px;height:62px;border-radius:18px}
  .course-art svg{width:47px;height:47px}
  .course-card h3{font-size:20px;margin-top:17px}
  .course-card p{font-size:11px}
  .course-status{font-size:7px;padding:6px 7px}
  .pillars-section{padding-top:65px}
  .pillars-grid{grid-template-columns:1fr;gap:13px}
  .pillar-card{min-height:315px;padding:23px;border-radius:22px}
  .pillar-art{width:160px;height:160px;top:58px}
  .pillar-copy{margin-top:117px}
  .pillar-copy h3{font-size:28px}
  .pillar-copy p{font-size:12px}
  .tracker-section-home{padding-top:0;padding-bottom:70px}
  .tracker-callout{grid-template-columns:1fr;gap:22px;padding:24px;border-radius:23px}
  .tracker-callout h2{font-size:38px}
  .tracker-callout p{font-size:12px}
  .tracker-mini{padding:16px}
  .page{padding:33px 0 65px}
  .page-heading{display:block}
  .stat-chip{margin-top:13px}
  .topic-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .topic-card{min-height:98px;padding:12px;gap:9px}
  .folder-icon{width:40px;height:40px}
  .topic-card-copy strong{font-size:14px}
  .topic-card-copy small{font-size:7px}
  .welcome-panel{grid-template-columns:1fr;gap:22px;padding:18px;border-radius:22px}
  .welcome-emblem{max-width:400px;margin:auto}
  .welcome-copy h1{font-size:46px}
  .lesson-hero{grid-template-columns:1fr}
  .lesson-visual-panel{min-height:235px}
  .key-grid{grid-template-columns:1fr 1fr}
  .quiz-head{align-items:flex-start;flex-direction:column;padding:22px}
  .quiz-body{padding:18px 22px}
  .quiz-question h3{font-size:18px}
  .quiz-option{font-size:12px}
  .tracker-hero{display:block}
  .tracker-hero .pill{margin-top:12px}
  .add-task-form{grid-template-columns:1fr}
  .tracker-toolbar{align-items:stretch;flex-direction:column}
  .date-field{width:100%}
  .about-hero{grid-template-columns:1fr;gap:22px;padding:20px}
  .about-logo{max-width:400px;margin:auto}
  .footer-inner{align-items:flex-start;flex-wrap:wrap}
  .footer-note{text-align:left;margin-left:0;width:100%}
}
@media(max-width:500px){
  .hero{padding-top:40px}
  .hero h1{font-size:clamp(43px,11.4vw,58px)}
  .hero-actions .btn{flex:1 1 100%}
  .hero-highlights{display:grid;grid-template-columns:1fr 1fr;font-size:9px}
  .hero-art{height:330px;margin-top:0}
  .hero-brand-card{width:68%;padding:5px;border-radius:16px}
  .hero-brand-card img{border-radius:11px}
  .hero-chip{min-width:91px;padding:7px 8px;grid-template-columns:27px auto;column-gap:6px;border-radius:12px}
  .hero-chip span{width:27px;height:27px;border-radius:8px}
  .hero-chip span svg{width:23px;height:23px}
  .hero-chip b{font-size:10px}
  .hero-chip small{font-size:7px}
  .hero-note{left:23%;padding:8px 10px}
  .hero-note small{font-size:6px}
  .hero-note strong{font-size:10px}
  .method-grid{grid-template-columns:1fr 1fr}
  .method-card{min-height:205px;padding:14px}
  .method-icon{width:42px;height:42px;margin:17px 0 10px}
  .method-card h3{font-size:18px}
  .method-card p{font-size:10px}
  .course-grid{grid-template-columns:1fr 1fr;gap:9px}
  .course-card{min-height:226px;padding:13px}
  .course-art{width:54px;height:54px;border-radius:16px}
  .course-art svg{width:42px;height:42px}
  .course-status{font-size:6px;letter-spacing:.04em}
  .course-card h3{font-size:18px;margin-top:14px}
  .course-card p{font-size:10px;line-height:1.65}
  .course-bottom{font-size:7px}
  .topic-grid{grid-template-columns:1fr}
  .topic-card{min-height:88px}
  .topic-card-copy strong{font-size:15px}
  .key-grid{grid-template-columns:1fr}
  .quiz-options{grid-template-columns:1fr}
  .quiz-actions .btn{flex:1}
  .lesson-bottom{align-items:flex-start;flex-direction:column}
  .lesson-actions{width:100%}
  .lesson-actions .btn{flex:1}
  .language-cards{grid-template-columns:1fr 1fr}
  .about-pillar-grid{grid-template-columns:1fr}
  .tracker-mini-stats{gap:8px}
}
@media(prefers-reduced-motion:reduce){
  *,*:before,*:after{scroll-behavior:auto!important;animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  .reveal-up{opacity:1!important;transform:none!important}
}
/* Visibility-first reveal: content never stays hidden if scripts or observers are unavailable. */
.reveal-up{opacity:1;transform:none}
.reveal-up.is-visible{animation:revealArrive .68s cubic-bezier(.2,.75,.25,1) both;animation-delay:var(--reveal-delay,0ms)}
@keyframes revealArrive{from{opacity:.35;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}
@media(min-width:761px){.hero h1{font-size:clamp(52px,4.9vw,70px)}}
@media(max-width:760px){.brand-copy small{white-space:nowrap;font-size:5.5px;letter-spacing:.11em}}

/* V6 — clear subject selection and beginner-first lesson reading */
.subjects-page{padding-top:34px}
.subjects-hero{position:relative;overflow:hidden;padding:clamp(24px,5vw,48px);margin:0 0 24px;border:1px solid var(--line);border-radius:28px;background:linear-gradient(125deg,var(--surface) 0%,var(--paper-2) 100%);box-shadow:var(--shadow-sm)}
.subjects-hero:after{content:"";position:absolute;width:260px;height:260px;right:-65px;top:-100px;border:1px solid color-mix(in srgb,var(--gold) 36%,transparent);border-radius:50%;box-shadow:0 0 0 22px color-mix(in srgb,var(--coral) 5%,transparent),0 0 0 48px color-mix(in srgb,var(--sage) 5%,transparent);pointer-events:none}
.subjects-hero h1{position:relative;z-index:1;font:600 clamp(38px,5vw,64px)/1.04 var(--serif);letter-spacing:-.04em;margin:10px 0 12px;max-width:760px}
.subjects-hero p{position:relative;z-index:1;max-width:690px;margin:0;color:var(--muted);font-size:14px;line-height:1.9}
.subjects-hero-note{position:relative;z-index:1;display:flex;align-items:center;gap:12px;width:max-content;max-width:100%;margin-top:21px;padding:12px 15px;background:var(--surface);border:1px solid var(--line);border-radius:15px;box-shadow:var(--shadow-sm)}
.subjects-note-icon{width:36px;height:36px;display:grid;place-items:center;border-radius:12px;background:var(--gold-soft);color:var(--gold)}
.subjects-hero-note strong,.subjects-hero-note small{display:block}.subjects-hero-note strong{font:600 14px var(--serif)}.subjects-hero-note small{margin-top:2px;color:var(--muted);font-size:10px}
.subjects-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:15px}
.subjects-grid .course-card{min-height:225px;padding:18px}
.subjects-grid .course-card h3{font-size:21px}.subjects-grid .course-card p{font-size:12px;line-height:1.75}
.subjects-footnote{margin:20px 0 0;padding:14px 16px;border-radius:13px;background:var(--surface-2);color:var(--muted);font-size:11px;text-align:center}
.lesson-navigation{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:7px}
.lesson-navigation .back-link{margin-bottom:14px}
.text-link{border:0;background:transparent;color:var(--gold);font-size:11px;font-weight:800;padding:8px 0}.text-link:hover{color:var(--coral)}
.lesson-start-panel{margin:28px 0;padding:clamp(20px,3vw,32px);border:1px solid var(--line);border-radius:23px;background:var(--surface-2)}
.lesson-start-panel h2,.lesson-content-heading h2,.remember-panel h2{font:600 clamp(26px,3vw,36px)/1.15 var(--serif);letter-spacing:-.025em;margin:8px 0 10px}
.lesson-start-panel>p{max-width:900px;color:var(--ink-soft);font-size:15px;line-height:1.9;margin:0 0 18px}
.lesson-start-panel .key-grid{margin-top:17px}
.lesson-content-section{margin:34px 0}
.lesson-content-heading{display:flex;align-items:end;justify-content:space-between;gap:25px;margin-bottom:17px}
.lesson-content-heading>p{max-width:430px;margin:0;color:var(--muted);font-size:12px;line-height:1.8}
.notebook-note.lesson-notes{display:block;padding:clamp(18px,3vw,34px);border:1px solid var(--line);border-radius:24px;background:var(--surface);color:var(--ink-soft);font-size:15px;line-height:1.9;box-shadow:var(--shadow-sm)}
.lesson-notes .source-section{padding:0 0 28px;margin:0 0 28px;border-bottom:1px solid var(--line)}
.lesson-notes .source-section:last-child{padding-bottom:0;margin-bottom:0;border-bottom:0}
.lesson-notes h2{font:600 clamp(23px,2.7vw,31px)/1.2 var(--serif);color:var(--ink);margin:0 0 13px}
.lesson-notes h3{font:600 20px/1.3 var(--serif);color:var(--ink);margin:24px 0 9px}
.lesson-notes p{max-width:980px;margin:11px 0 15px;color:var(--ink-soft);font-size:15px;line-height:1.95}
.lesson-notes strong{color:var(--ink)}
.lesson-notes ul,.lesson-notes ol{padding-left:24px;color:var(--ink-soft);font-size:14px;line-height:1.9}
.lesson-notes li{padding:3px 0}
.lesson-notes table{width:100%;border-collapse:separate;border-spacing:0;margin:18px 0 22px;overflow:hidden;border:1px solid var(--line);border-radius:13px;font-size:13px}
.lesson-notes th{background:var(--surface-2);color:var(--ink);font-weight:800;text-align:left}
.lesson-notes th,.lesson-notes td{padding:11px 13px;border-bottom:1px solid var(--line);border-right:1px solid var(--line);vertical-align:top}
.lesson-notes tr:last-child td{border-bottom:0}.lesson-notes th:last-child,.lesson-notes td:last-child{border-right:0}
.lesson-notes pre{max-width:100%;overflow:auto;margin:12px 0 17px;padding:17px 19px;border:1px solid color-mix(in srgb,var(--gold) 25%,var(--line));border-radius:14px;background:#201f1b;color:#f3eee3;font:13px/1.8 var(--mono);white-space:pre}
.lesson-notes pre code{color:inherit;font-family:inherit}
.lesson-notes .notebook-code{overflow:hidden;margin:17px 0 20px;border:1px solid var(--line);border-radius:15px;background:var(--surface-2)}
.lesson-notes .notebook-code-head{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px 14px;border-bottom:1px solid var(--line);color:var(--gold);font:600 9px var(--mono);letter-spacing:.1em}
.lesson-notes .notebook-code pre{margin:0;border:0;border-radius:0}
.lesson-notes .copy-code{padding:6px 10px;border:1px solid var(--line);border-radius:999px;background:var(--surface);color:var(--ink);font:600 9px var(--sans)}
.lesson-notes code:not(pre code){padding:2px 5px;border-radius:5px;background:var(--surface-2);color:var(--coral);font:600 .91em var(--mono)}
.remember-panel{display:flex;align-items:flex-start;gap:15px;margin:30px 0;padding:22px;border:1px solid var(--line);border-radius:20px;background:var(--sage-soft)}
.remember-icon{width:43px;height:43px;flex:none;display:grid;place-items:center;border-radius:14px;background:var(--surface);color:var(--sage)}
.remember-panel h2{font-size:25px;margin:4px 0 7px}.remember-panel p{max-width:820px;margin:0;color:var(--ink-soft);font-size:13px;line-height:1.85}
@media(max-width:1000px){.subjects-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:760px){.subjects-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.subjects-grid .course-card{min-height:205px;padding:13px}.subjects-hero{padding:22px;border-radius:21px}.lesson-content-heading{display:block}.lesson-content-heading>p{margin-top:8px}.lesson-notes.lesson-notes{padding:17px}.lesson-notes p{font-size:14px}.lesson-notes table{display:block;overflow-x:auto;white-space:nowrap}.lesson-navigation{align-items:flex-start}.lesson-navigation .back-link{font-size:10px}}
@media(max-width:480px){.subjects-grid{grid-template-columns:1fr 1fr}.subjects-grid .course-card h3{font-size:17px}.subjects-grid .course-card p{font-size:10px}.lesson-notes h2{font-size:23px}.lesson-notes h3{font-size:18px}.lesson-notes pre{font-size:11px;padding:13px}.remember-panel{padding:16px;gap:11px}}


/* V6 TEACHER-FIRST LEARNING LAYER */
.teacher-classroom{margin:28px 0 34px;padding:clamp(20px,3.2vw,36px);border:1px solid var(--line);border-radius:26px;background:linear-gradient(145deg,var(--surface-2),var(--surface));box-shadow:var(--shadow-sm)}
.teacher-classroom-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:10px;flex-wrap:wrap}
.teacher-label,.teacher-level,.teacher-mini-label,.teacher-memory>span{font:700 9px var(--mono);letter-spacing:.13em;color:var(--gold)}
.teacher-level{padding:7px 10px;border:1px solid var(--line);border-radius:999px;color:var(--sage)}
.teacher-classroom>h2{font:600 clamp(27px,3.2vw,39px)/1.12 var(--serif);letter-spacing:-.025em;margin:8px 0 18px;color:var(--ink)}
.teacher-why{padding:17px 20px;background:var(--sage-soft);border:1px solid color-mix(in srgb,var(--sage) 25%,var(--line));border-radius:16px;margin:14px 0 16px}.teacher-why p{font-size:14px;line-height:1.9;color:var(--ink-soft);margin:7px 0 0;max-width:1000px}
.teacher-analogy{padding:18px 20px;background:var(--gold-soft);border:1px solid color-mix(in srgb,var(--gold) 25%,var(--line));border-radius:17px;margin:15px 0 20px}
.teacher-analogy p{font-size:clamp(14px,1.35vw,17px);line-height:1.9;color:var(--ink-soft);margin:7px 0 0;max-width:1000px}
.teacher-code-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:12px;margin:18px 0}
.teacher-code-card,.teacher-output-card{background:var(--surface);border:1px solid var(--line);border-radius:16px;overflow:hidden;min-width:0}
.teacher-code-head{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:11px 14px;border-bottom:1px solid var(--line);color:var(--gold);font:700 8px var(--mono);letter-spacing:.12em}
.teacher-code-card pre,.teacher-output-card pre{margin:0;padding:17px 18px;white-space:pre-wrap;overflow-wrap:anywhere;font:12px/1.9 var(--mono);min-height:100px}
.teacher-code-card pre{background:#211f1b;color:#f7f1e6}
.teacher-output-card pre{background:var(--sage-soft);color:var(--ink);font-size:13px}
.teacher-trace{margin:22px 0}
.teacher-trace h3{font:600 23px var(--serif);margin:0 0 12px;color:var(--ink)}
.teacher-trace ol{list-style:none;counter-reset:walk;display:grid;grid-template-columns:repeat(3,1fr);gap:10px;padding:0;margin:0}
.teacher-trace li{counter-increment:walk;display:flex;align-items:flex-start;gap:10px;padding:14px;border:1px solid var(--line);border-radius:14px;background:var(--surface)}
.teacher-step-number{display:grid;place-items:center;flex:none;width:28px;height:28px;border-radius:9px;background:var(--coral-soft);color:var(--coral);font:700 10px var(--mono)}
.teacher-trace li p{font-size:13px;line-height:1.9;color:var(--ink-soft);margin:0}.lesson-notes{max-width:100%;font-size:15px;line-height:1.9}.lesson-notes p{max-width:78ch;line-height:1.95}.lesson-notes h2,.lesson-notes h3{margin-top:1.8em;margin-bottom:.7em}.lesson-notes pre{overflow-x:auto;max-width:100%}
.teacher-warning{padding:16px 18px;border:1px solid color-mix(in srgb,var(--coral) 28%,var(--line));border-left:4px solid var(--coral);border-radius:13px;background:var(--coral-soft);margin:18px 0}
.teacher-warning strong{font:700 9px var(--mono);letter-spacing:.1em;color:var(--coral)}
.teacher-warning p{margin:7px 0 0;color:var(--ink-soft);font-size:13px;line-height:1.85}
.teacher-memory{display:flex;align-items:flex-start;gap:14px;padding:16px 18px;border-radius:14px;background:var(--sage-soft);border:1px solid color-mix(in srgb,var(--sage) 25%,var(--line))}
.teacher-memory>span{white-space:nowrap;color:var(--sage);padding-top:3px}
.teacher-memory p{margin:0;color:var(--ink);font:600 14px/1.8 var(--sans)}
.next-stage-roadmap{margin:40px 0 18px;padding:clamp(20px,3vw,32px);border:1px solid var(--line);border-radius:22px;background:var(--surface-2)}
.next-stage-roadmap h2{font:600 clamp(25px,3vw,34px)/1.15 var(--serif);margin:8px 0;color:var(--ink)}
.next-stage-roadmap>p{max-width:900px;color:var(--muted);font-size:13px;line-height:1.85}
.roadmap-chips{display:grid;grid-template-columns:repeat(3,1fr);gap:9px;margin:17px 0}
.roadmap-chip{display:flex;align-items:center;gap:9px;padding:12px;border:1px solid var(--line);border-radius:12px;background:var(--surface);color:var(--ink-soft);font-size:11px}
.roadmap-chip>span{color:var(--gold);font-size:16px}.roadmap-chip small{margin-left:auto;color:var(--muted);font:700 7px var(--mono);letter-spacing:.08em}
.roadmap-honesty{padding:13px 15px;border-left:3px solid var(--gold);background:var(--gold-soft);border-radius:0 10px 10px 0}
@media(max-width:760px){.teacher-code-grid{grid-template-columns:1fr}.teacher-trace ol{grid-template-columns:1fr}.roadmap-chips{grid-template-columns:1fr 1fr}.teacher-memory{display:block}.teacher-memory>span{display:block;margin-bottom:6px}}
@media(prefers-reduced-motion:reduce){.teacher-classroom *{animation:none!important;transition:none!important}}


/* V6 teaching rebuild: clearer beginner-first structure */
.teacher-first-idea{padding:17px 19px;margin:15px 0;border-radius:15px;background:color-mix(in srgb,var(--gold) 11%,var(--surface));border:1px solid color-mix(in srgb,var(--gold) 32%,var(--line))}
.teacher-first-idea p{font-size:15px;line-height:1.9;color:var(--ink-soft);margin:8px 0 0;max-width:82ch}
.teacher-deep-sections{display:grid;grid-template-columns:1fr;gap:10px;margin:18px 0 22px}
.teacher-deep-card{display:grid;grid-template-columns:38px 1fr;gap:13px;align-items:start;padding:15px 16px;border:1px solid var(--line);border-radius:15px;background:var(--surface)}
.teacher-deep-index{width:34px;height:34px;display:grid;place-items:center;border-radius:11px;background:var(--sage-soft);color:var(--sage);font:600 11px var(--mono)}
.teacher-deep-card h3{font:600 18px/1.35 var(--serif);margin:1px 0 6px;color:var(--ink)}
.teacher-deep-card p{font-size:13px;line-height:1.9;color:var(--ink-soft);margin:0;max-width:82ch}
.lesson-roadmap{margin:28px 0 34px;padding:clamp(18px,2.6vw,28px);border-radius:23px;background:var(--surface-2);border:1px solid var(--line)}
.lesson-roadmap>h2{font:600 clamp(24px,3vw,32px)/1.2 var(--serif);margin:8px 0 19px;color:var(--ink)}
.lesson-roadmap-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.lesson-roadmap-item{display:grid;grid-template-columns:30px 1fr;gap:10px;padding:13px 14px;border:1px solid var(--line);border-radius:13px;background:var(--surface)}
.lesson-roadmap-item>span{font:600 10px var(--mono);color:var(--coral);padding-top:3px}
.lesson-roadmap-item h3{font:600 15px/1.35 var(--sans);margin:0;color:var(--ink)}
.lesson-roadmap-item p{font-size:11px;line-height:1.75;color:var(--muted);margin:6px 0 0}
.flow-mini{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:9px;padding:15px;margin:14px 0;border-radius:13px;background:var(--surface-2);border:1px solid var(--line)}
.flow-mini span{padding:8px 12px;border-radius:999px;background:var(--surface);border:1px solid var(--line);font:600 11px var(--sans);color:var(--ink)}
.flow-mini b{color:var(--gold);font:600 16px var(--sans)}
.concept-callout{padding:13px 15px;margin:13px 0;border-left:3px solid var(--coral);background:var(--coral-soft);border-radius:0 12px 12px 0;color:var(--ink-soft);font-size:13px;line-height:1.8}
@media(max-width:760px){.lesson-roadmap-grid{grid-template-columns:1fr}.teacher-deep-card p{font-size:12px}}