:root{--bg:#202936;--panel:#283341;--panel-soft:#24303d;--text:#eef3f7;--muted:#b8c4cf;--accent:#79b7d8;--accent-deep:#347aa1;--line:rgba(255,255,255,.13);--max:1040px;--radius:14px}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:radial-gradient(circle at 80% -10%,#344657 0,transparent 34rem),var(--bg);color:var(--text);font-family:Inter,Roboto,Arial,sans-serif;line-height:1.65}
a{color:inherit}
.topbar{position:sticky;top:0;z-index:10;min-height:66px;padding:10px max(18px,calc((100% - var(--max))/2));display:flex;align-items:center;justify-content:space-between;gap:20px;background:rgba(32,41,54,.94);border-bottom:1px solid var(--line);backdrop-filter:blur(14px)}
.brand{font-weight:800;text-decoration:none;letter-spacing:.02em}.brand img{display:block;width:145px;max-height:44px;object-fit:contain}
main{max-width:var(--max);margin:auto;padding:40px 20px 70px}
.hero{display:grid;grid-template-columns:minmax(180px,260px) 1fr;align-items:center;gap:42px;margin-bottom:36px}.hero-home{margin-bottom:58px}.cover{width:100%;border-radius:var(--radius);box-shadow:0 22px 50px rgba(0,0,0,.26)}
.eyebrow{margin:0 0 8px;color:var(--accent);font-size:12px;font-weight:800;letter-spacing:.14em;text-transform:uppercase}
h1{max-width:720px;margin:0 0 14px;font-size:clamp(34px,6vw,60px);line-height:1.05;letter-spacing:-.035em}h2{margin:0;font-size:clamp(26px,4vw,38px);line-height:1.15}h3{margin:32px 0 12px;font-size:22px;line-height:1.35}h4{margin:26px 0 10px;font-size:19px}
.hero p:not(.eyebrow){max-width:650px;margin:0;color:var(--muted);font-size:18px}.section-heading{margin-bottom:20px}
.module-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.module-card{display:flex;min-width:0;flex-direction:column;overflow:hidden;border:1px solid var(--line);border-radius:var(--radius);background:var(--panel-soft);text-decoration:none;box-shadow:0 8px 20px rgba(0,0,0,.1);transition:transform .18s ease,border-color .18s ease}.module-card[href]:hover{transform:translateY(-4px);border-color:rgba(121,183,216,.7)}.module-card img{display:block;width:100%;height:auto;object-fit:contain;background:#1a222c}.card-copy{display:flex;min-height:74px;flex-direction:column;justify-content:center;padding:12px 14px}.card-copy strong{font-size:15px;line-height:1.3}.card-copy small{margin-top:5px;color:var(--accent);font-size:11px;font-weight:800;letter-spacing:.08em;text-transform:uppercase}.is-locked{opacity:.68;cursor:not-allowed}.is-locked .card-copy small{color:var(--muted)}.more-content-card img{filter:saturate(.82)}.module-card.is-current{border-color:var(--accent);box-shadow:0 0 0 2px rgba(121,183,216,.18)}
.instruction{margin:0 0 18px;padding:15px 18px;border-left:3px solid var(--accent-deep);border-radius:0 8px 8px 0;background:rgba(255,255,255,.045);color:var(--muted)}.instruction strong{color:#fff}
.lesson{margin:12px 0;overflow:hidden;border:1px solid var(--line);border-radius:10px;background:var(--panel)}.lesson summary{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:15px 17px;list-style:none;cursor:pointer;background:var(--accent-deep);font-size:16px}.lesson summary::-webkit-details-marker{display:none}.lesson summary:hover{background:#3d87b0}.lesson summary b{font-weight:700}.chevron{width:10px;height:10px;flex:0 0 auto;border-right:2px solid;border-bottom:2px solid;transform:rotate(45deg);transition:transform .2s}.lesson[open] .chevron{transform:rotate(225deg)}
.lesson-content{padding:26px 26px 30px;font-size:18px}.lesson-content>*:first-child{margin-top:0}.lesson-content>*:last-child{margin-bottom:0}.lesson-content p{margin:0 0 18px}.lesson-content ul,.lesson-content ol{margin:10px 0 20px;padding-left:26px}.lesson-content li{margin:7px 0}.lesson-content strong{color:#fff}.lesson-content em{color:#d8e8f1}.lesson-content hr{margin:28px 0;border:0;border-top:1px solid var(--line)}.lesson-content blockquote{margin:20px 0;padding:16px 18px;border-left:3px solid var(--accent);border-radius:0 8px 8px 0;background:rgba(255,255,255,.04)}.lesson-content blockquote p{margin:0}.lesson-content code{padding:2px 5px;border-radius:4px;background:rgba(0,0,0,.24)}.welcome-content{margin:0 0 58px;padding:clamp(22px,4vw,42px);border:1px solid var(--line);border-radius:var(--radius);background:var(--panel)}.welcome-content h3{font-size:clamp(25px,4vw,34px)}.welcome-content h4{font-size:22px}.module-program{margin-top:54px;padding-top:34px;border-top:1px solid var(--line)}
.module-nav{display:grid;grid-template-columns:1fr auto 1fr;gap:14px;align-items:center;margin-top:38px;padding-top:24px;border-top:1px solid var(--line);font-size:14px}.module-nav span:last-child{text-align:right}.module-nav a{color:var(--accent);text-decoration:none}.module-nav a:hover{text-decoration:underline}
footer{max-width:var(--max);margin:auto;padding:0 20px 34px;color:#8796a5;font-size:12px;text-align:center}
@media(max-width:760px){main{padding:26px 14px 55px}.topbar{padding:9px 14px}.hero{grid-template-columns:1fr;gap:24px}.hero .cover{max-width:300px;margin:auto}.hero h1{text-align:center}.hero p{text-align:center}.eyebrow{text-align:center}.module-grid{grid-template-columns:repeat(2,1fr);gap:12px}.lesson-content{padding:22px 16px 26px;font-size:17px}.lesson summary{padding:13px 14px}.module-nav{grid-template-columns:1fr;text-align:center}.module-nav span:last-child{text-align:center}}
@media(max-width:420px){.brand img{width:118px}.languages a{padding:4px 7px}.module-grid{grid-template-columns:1fr 1fr;gap:8px}.card-copy{min-height:68px;padding:10px}.card-copy strong{font-size:13px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.module-card,.chevron{transition:none}}