:root{color-scheme:dark;--bg:#0a121c;--surface:#111e2b;--surface2:#162534;--ink:#f7f2e8;--muted:#b5c4ca;--line:#344756;--accent:#e6ab73;--link:#adddec;--on-accent:#211509;--hero-bg:#0b141f;--shadow:#02080b70;--display:Georgia,serif;--body:"Instrument Sans","Avenir Next",system-ui,sans-serif}
:root[data-theme=light]{color-scheme:light;--bg:#f8f4ea;--surface:#fffdf7;--surface2:#efe9dc;--ink:#222b32;--muted:#53636a;--line:#d4cfc1;--accent:#9b4a20;--link:#125970;--on-accent:#fff8ef;--hero-bg:#f4ebda;--shadow:#41352218}
*,*::before,*::after{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font:400 1rem/1.6 var(--body)}a{color:var(--link);text-underline-offset:.22em}button{font:inherit;color:inherit}a,button{-webkit-tap-highlight-color:transparent}a:focus-visible,button:focus-visible,[tabindex]:focus-visible{outline:2px solid var(--link);outline-offset:4px}.shell{width:min(1240px,calc(100% - 80px));margin-inline:auto}.skip{position:absolute;left:12px;top:12px;padding:8px 14px;transform:translateY(-150%);background:var(--surface);z-index:10}.skip:focus{transform:none}.top{border-bottom:1px solid var(--line);background:var(--bg)}.top-inner{display:flex;align-items:center;justify-content:space-between;min-height:66px}.brand{font-weight:800;letter-spacing:-.045em;font-size:1.42rem;color:var(--ink);text-decoration:none}.brand span{color:var(--accent)}.tools{display:flex;align-items:center;gap:23px}.tools a{text-decoration:none;color:var(--muted)}.tools button{border:1px solid var(--line);border-radius:100px;padding:5px 14px;background:var(--surface);cursor:pointer;min-width:107px}
.hero{background:var(--hero-bg);overflow:hidden;border-bottom:1px solid var(--line)}.hero-inner{position:relative;min-height:min(660px,66vw);display:grid;grid-template-columns:1.05fr 1fr;align-items:stretch}.hero-copy{align-self:center;z-index:1;padding:58px 28px 65px 0}.eyebrow{font-weight:750;font-size:.75rem;text-transform:uppercase;letter-spacing:.15em;color:var(--accent);margin:0 0 12px}.hero h1{font:400 clamp(4rem,9.7vw,9.5rem)/.88 var(--display);letter-spacing:-.079em;margin:12px 0 25px}.hero h1 span{color:var(--accent)}.hero-text{color:var(--muted);max-width:470px;margin:0;font-size:clamp(1.02rem,1.8vw,1.22rem);line-height:1.56}.hero-actions{display:flex;gap:20px;align-items:center;margin-top:25px;flex-wrap:wrap}.primary{padding:10px 18px;background:var(--accent);color:var(--on-accent);font-weight:750;border-radius:6px;text-decoration:none}.primary span{margin-left:6px}.minor{font-weight:650}.hero-meta{display:flex;align-items:center;flex-wrap:wrap;gap:8px 11px;margin:22px 0 0;color:var(--muted);font-size:.82rem}.hero-meta i{display:inline-block;width:3px;height:3px;border-radius:50%;background:var(--accent)}
.hero-figure{position:absolute;inset:0 0 0 43%;margin:0;overflow:hidden}.hero-figure img{display:block;width:100%;height:100%;object-fit:cover;object-position:58% 50%;animation:settle 1.25s ease-out both}.hero-figure::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,var(--hero-bg),transparent 31%),linear-gradient(0deg,var(--hero-bg),transparent 16%);pointer-events:none}.hero-figure figcaption{position:absolute;right:13px;bottom:17px;z-index:1;font-size:.72rem;padding:3px 8px;color:#f8f3e8;background:#09141acd;border-radius:3px}@keyframes settle{from{transform:scale(1.035)}to{transform:scale(1)}}
.body{padding:38px 0 65px}.section-heading{display:flex;justify-content:space-between;align-items:baseline;gap:12px;flex-wrap:wrap}.section-heading h2{font:400 clamp(1.85rem,4vw,3rem)/1.1 var(--display);margin:0}.section-heading p{margin:0;color:var(--muted)}.chapter-block{scroll-margin-top:15px}.chapter-block nav{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;margin:18px 0 42px}.chapter-link{display:block;padding:14px 16px;background:var(--surface);border:1px solid var(--line);border-radius:9px;color:var(--ink);text-decoration:none}.chapter-link:hover,.chapter-link[aria-current=true]{border-color:var(--accent)}.chapter-link small{display:block;color:var(--accent);font-size:.76rem;font-weight:700}.chapter-link strong{line-height:1.22;display:block;margin:.2rem 0}
.reader{display:grid;grid-template-columns:minmax(260px,.85fr) minmax(0,1.15fr);background:var(--surface);border:1px solid var(--line);border-radius:13px;overflow:hidden;box-shadow:0 18px 45px var(--shadow);scroll-margin-top:15px}.screen{background:#090f18;display:grid;place-items:center;padding:25px;align-self:stretch}.screen video{display:block;aspect-ratio:9/16;width:min(100%,350px);height:auto;max-height:630px;border-radius:8px;object-fit:contain;background:#080e16}.lesson{padding:clamp(20px,4vw,52px)}.lesson h2{font:400 clamp(2rem,5vw,3.9rem)/1.03 var(--display);letter-spacing:-.045em;margin:0}.question{color:var(--muted);font-size:1.04rem;margin:12px 0 17px}.takeaway{margin:0;padding:8px 0 8px 13px;border-left:2px solid var(--accent);font-weight:650}.transcript,.sources{margin-top:23px}.lesson h3{font:400 1.5rem/1.2 var(--display);margin:0 0 5px}.hint{color:var(--muted);font-size:.82rem;margin:0 0 9px}.line{display:grid;grid-template-columns:3.35rem minmax(0,1fr);gap:10px;margin:0;padding:7px 0;border-top:1px solid var(--line);font-size:.95rem;align-items:start}.line button{background:var(--surface2);border:1px solid var(--line);border-radius:5px;cursor:pointer;color:var(--link);font-variant-numeric:tabular-nums;font-size:.78rem;padding:3px 4px}.line button:hover{border-color:var(--link)}.sources ul{list-style:none;padding:0;margin:0;font-size:.91rem}.sources li{margin:6px 0}.lesson-nav{display:flex;justify-content:space-between;gap:12px;margin-top:23px;padding-top:13px;border-top:1px solid var(--line);font-size:.88rem;font-weight:650}.lesson-nav [aria-disabled=true]{visibility:hidden}
.contents{margin-top:52px}.catalogue-group{margin-top:25px}.catalogue-group h3{font:400 1.7rem/1.1 var(--display);margin:0 0 4px}.catalogue-group p{color:var(--muted);margin:0 0 12px}.grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:10px}.card{display:block;background:var(--surface);color:var(--ink);text-decoration:none;border:1px solid var(--line);border-radius:8px;overflow:hidden}.card:hover,.card[aria-current=true]{border-color:var(--accent)}.card-media{aspect-ratio:4/3;background:#09131e;position:relative;overflow:hidden}.card-media img{width:100%;height:100%;object-fit:cover;object-position:50% 52%;display:block}.card-media span{position:absolute;left:8px;bottom:8px;color:#f8f4ed;background:#0b1827de;border-radius:4px;font-weight:750;font-size:.72rem;padding:2px 7px}.card-title{display:block;line-height:1.26;padding:10px 9px 12px;font-weight:700;font-size:.92rem}.footer{border-top:1px solid var(--line);padding:22px 0;color:var(--muted);font-size:.86rem}.footer .shell{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}.footer p{margin:0}
@media(max-width:900px){.shell{width:calc(100% - 44px)}.hero-inner{min-height:520px}.hero-figure{left:38%}.chapter-block nav{grid-template-columns:repeat(2,minmax(0,1fr))}.grid{grid-template-columns:repeat(3,minmax(0,1fr))}.reader{grid-template-columns:minmax(215px,.85fr) minmax(0,1.15fr)}.screen{padding:16px}}
@media(max-width:620px){.shell{width:calc(100% - 32px)}.top-inner{min-height:59px}.tools{gap:12px;font-size:.85rem}.tools button{min-width:0}.hero-inner{display:flex;flex-direction:column;min-height:0}.hero-copy{padding:34px 0 4px;align-self:start}.hero h1{font-size:clamp(3.4rem,15vw,5.5rem);margin-bottom:16px}.hero-meta{margin-top:14px}.hero-figure{position:relative;inset:auto;height:225px;margin:2px -16px 0}.hero-figure::after{background:linear-gradient(180deg,var(--hero-bg),transparent 20%),linear-gradient(0deg,var(--hero-bg),transparent 16%)}.hero-figure img{object-position:50% 54%}.body{padding-top:24px}.chapter-block nav{margin-bottom:24px}.chapter-link{padding:9px 10px;font-size:.9rem}.reader{grid-template-columns:1fr}.screen{padding:12px}.screen video{width:min(100%,240px)}.lesson{padding:20px 16px 24px}.contents{margin-top:33px}.grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.hero-figure img{animation:none}}

.card-preview{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:50% 52%;opacity:0;pointer-events:none}.card-preview.is-playing{opacity:1}.card-media span{z-index:1}
.platform-hero{min-height:min(560px,60vw)}
.platform-hero h1{font-size:clamp(2.7rem,7vw,6rem);letter-spacing:-.055em;line-height:1}
@media(max-width:620px){.platform-hero{min-height:0}.platform-hero h1{font-size:clamp(2.4rem,9.5vw,4rem)}}
@media(max-width:380px){.top-inner{flex-wrap:wrap;column-gap:12px;row-gap:6px;padding-block:8px}.tools{gap:9px}.tools button{padding-inline:8px}}