:root{--primary:#6D28D9;--primary-dark:#2E1065;--indigo:#4F46E5;--accent:#22D3EE;--bg:#faf7f4;--surface:#fff;--text:#1a1210;--text-2:#57473f;--text-3:#9b8b83;--border:#ece3dc;--ok:#16a34a;--ko:#dc2626;--r:12px;--shadow:0 8px 24px rgba(40,20,10,.07)}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'DM Sans',system-ui,sans-serif;background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;line-height:1.55;min-height:100vh;display:flex;flex-direction:column}
body>main,body>.layout,body>section{flex:0 0 auto}
.footer{margin-top:auto}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
h1,h2,h3{font-family:'Source Serif 4',serif;line-height:1.15;letter-spacing:-.01em}
.wrap{max-width:1180px;margin:0 auto;padding:0 28px}
.narrow{max-width:780px}.center{text-align:center}.muted{color:var(--text-2)}.small{font-size:13px}
main.wrap{padding-top:36px;padding-bottom:72px}
main h1{font-size:clamp(28px,4vw,40px);margin-bottom:12px}

/* Topbar */
.topbar{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.85);backdrop-filter:blur(18px) saturate(180%);border-bottom:1px solid var(--border)}
.topbar-inner{max-width:1180px;margin:0 auto;padding:0 28px;height:62px;display:flex;align-items:center;gap:28px}
.brand{display:flex;align-items:center;gap:10px;font-weight:600;font-size:15px}
.brand b{color:var(--primary);font-weight:800}
.nav{display:flex;gap:6px;flex:1}
.nav a{padding:8px 12px;border-radius:8px;font-size:14px;font-weight:500;color:var(--text-2)}
.nav a:hover,.nav a.on{color:var(--primary);background:rgba(109,40,217,.07)}
.topbar-right{display:flex;align-items:center;gap:12px}
.lang{font-size:12px;font-weight:700;letter-spacing:.08em;padding:6px 9px;border:1px solid var(--border);border-radius:8px;color:var(--text-2)}
.lang:hover{border-color:var(--primary);color:var(--primary)}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 20px;border-radius:10px;border:0;cursor:pointer;font:600 14px 'DM Sans',sans-serif;color:#fff;background:linear-gradient(135deg,var(--primary),var(--indigo));box-shadow:0 2px 10px rgba(109,40,217,.25);transition:transform .15s,box-shadow .15s}
.btn:hover{transform:translateY(-1px);box-shadow:0 6px 18px rgba(109,40,217,.32)}
.btn[disabled]{opacity:.5;cursor:not-allowed;transform:none}
.btn-sm{padding:8px 14px;font-size:13px}
.btn-block{display:flex;width:100%;margin-bottom:10px}
.btn-ghost{background:#fff;color:var(--text);border:1px solid var(--border);box-shadow:none}
.btn-ghost:hover{border-color:var(--primary);color:var(--primary);box-shadow:none}
.link-btn{background:none;border:0;color:var(--text-3);font:500 13px 'DM Sans',sans-serif;cursor:pointer;text-decoration:underline;margin:4px 0 12px}

/* Hero */
.hero{background:linear-gradient(135deg,var(--primary-dark),#4c1d95 55%,var(--indigo));color:#fff;padding:64px 0 56px;position:relative;overflow:hidden}
.hero::after{content:'CLASSROOMS';position:absolute;right:2%;bottom:-30px;font-weight:800;font-size:clamp(70px,13vw,200px);letter-spacing:.06em;color:rgba(255,255,255,.05);pointer-events:none;line-height:1}
.hero h1{font-size:clamp(34px,5vw,58px);font-weight:900;max-width:760px;margin-bottom:14px}
.hero p{font-family:'Source Serif 4',serif;font-size:19px;color:rgba(255,255,255,.78);max-width:640px}
.hero .search{display:flex;gap:10px;margin-top:28px;max-width:560px;position:relative;z-index:1}
.hero .search input{flex:1;padding:13px 16px;border-radius:10px;border:0;font:15px 'DM Sans',sans-serif;outline:none}
.hero .search .btn{background:var(--accent);color:#0b1020;box-shadow:none}
.hero-course{background:linear-gradient(135deg,var(--primary-dark),var(--c,var(--primary)))}
.hero-course::after{content:none}
.crumb{display:inline-flex;gap:8px;align-items:center;font-size:12px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:rgba(255,255,255,.8);margin-bottom:14px}
.crumb-dark{color:var(--text-3);margin-bottom:10px}
.meta{display:flex;flex-wrap:wrap;gap:6px 16px;font-size:12.5px;color:var(--text-3)}
.meta i{margin-right:5px;color:var(--c,var(--primary))}
.meta-hero{margin-top:22px;color:rgba(255,255,255,.85);font-size:13.5px}.meta-hero i{color:var(--accent)}

/* Filters / chips */
.filters{display:flex;flex-direction:column;gap:12px;margin-bottom:30px}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{padding:8px 15px;border-radius:999px;border:1px solid var(--border);background:#fff;font-size:13.5px;font-weight:600;color:var(--text-2)}
.chip i{color:var(--c,var(--primary));margin-right:4px}
.chip:hover,.chip.on{border-color:var(--c,var(--primary));color:var(--c,var(--primary));background:#fff;box-shadow:0 0 0 3px rgba(109,40,217,.08)}
.chip-sm{padding:5px 12px;font-size:12.5px;font-weight:500}
.section-title{font-family:'DM Sans',sans-serif;font-size:13px;letter-spacing:.12em;text-transform:uppercase;border-top:2px solid var(--text);padding-top:13px;margin:36px 0 20px}

/* Cards */
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:26px}
.grid-rows{grid-template-columns:repeat(2,minmax(0,1fr))}
.card{display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--border);border-radius:var(--r);overflow:hidden;transition:transform .2s,box-shadow .2s}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.card-img{aspect-ratio:16/9;background:linear-gradient(135deg,var(--c,var(--primary)),var(--primary-dark)) center/cover;position:relative}
.badge{position:absolute;left:12px;top:12px;background:rgba(255,255,255,.95);color:var(--c,var(--primary));font-size:11px;font-weight:700;padding:5px 10px;border-radius:999px;letter-spacing:.04em}
.card-body{padding:18px 18px 20px;display:flex;flex-direction:column;gap:10px;flex:1}
.card h3{font-size:20px}
.card p{font-size:14.5px;color:var(--text-2)}
.card .meta{margin-top:auto}
.card-row{flex-direction:row}.card-row .card-img{width:150px;aspect-ratio:auto;flex:none}
.empty{padding:50px 0;text-align:center;color:var(--text-2)}

/* Layouts */
.layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:44px;padding-top:40px;padding-bottom:72px}
.layout-lesson{grid-template-columns:290px minmax(0,1fr)}
.layout-lesson .side-outline{order:-1}
.side .panel{position:sticky;top:86px}
.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--r);padding:20px}
.facts{list-style:none;margin-top:14px;display:grid;gap:9px;font-size:14px;color:var(--text-2)}
.facts i{width:20px;color:var(--primary)}
.bar{height:8px;background:var(--border);border-radius:99px;overflow:hidden;margin:8px 0 14px}
.bar i{display:block;height:100%;background:linear-gradient(90deg,var(--primary),var(--accent));border-radius:99px}
.progress-label{font-size:13.5px;color:var(--text-2)}
.content h2.section-title:first-child{margin-top:0}
.checklist{list-style:none;display:grid;gap:10px}
.checklist li{padding-left:28px;position:relative}
.checklist li::before{content:'\f00c';font-family:'Font Awesome 6 Free';font-weight:900;position:absolute;left:0;top:1px;color:var(--ok);font-size:14px}

/* Program / lessons list */
.chapter{margin-bottom:24px}
.chapter h3{font-size:20px;margin-bottom:10px}
.chapter-n{display:block;font:700 11px 'DM Sans',sans-serif;letter-spacing:.12em;text-transform:uppercase;color:var(--primary);margin-bottom:4px}
.lessons{list-style:none;background:var(--surface);border:1px solid var(--border);border-radius:var(--r);overflow:hidden}
.lessons li+li{border-top:1px solid var(--border)}
.lessons a{display:flex;align-items:center;gap:12px;padding:13px 16px;font-size:15px}
.lessons a span{flex:1}
.lessons a small{color:var(--text-3);font-size:12px}
.lessons a:hover{background:rgba(109,40,217,.04)}
.lessons i{color:var(--text-3);width:18px}
.lessons .done i{color:var(--ok)}
.lessons .quiz-row i{color:var(--indigo)}.lessons .quiz-row.done i{color:var(--ok)}
.lessons .current{background:rgba(109,40,217,.07)}.lessons .current a{font-weight:700;color:var(--primary)}
.lessons-sm a{padding:9px 12px;font-size:13.5px}
.outline-title{display:block;font-family:'Source Serif 4',serif;font-weight:700;font-size:17px;margin-bottom:6px}
.outline-chapter{font:700 11px 'DM Sans',sans-serif;letter-spacing:.08em;text-transform:uppercase;color:var(--text-3);margin:14px 0 6px}
.side-outline .panel{max-height:calc(100vh - 110px);overflow:auto}

/* Lesson + prose */
.eyebrow{display:block;font:700 12px 'DM Sans',sans-serif;letter-spacing:.12em;text-transform:uppercase;color:var(--primary);margin-bottom:8px}
.lesson-head{margin-bottom:22px}
.lesson h1{font-size:clamp(28px,3.4vw,40px)}
.prose{font-family:'Source Serif 4',serif;font-size:18.5px;line-height:1.7;color:#2a1f1a}
.prose>*+*{margin-top:1.1em}
.prose h2{font-size:27px;margin-top:1.8em}.prose h3{font-size:21px;margin-top:1.5em}
.prose ul,.prose ol{padding-left:1.4em}.prose li+li{margin-top:.35em}
.prose a{color:var(--primary);text-decoration:underline}
.prose code{font:.86em ui-monospace,SFMono-Regular,Menlo,monospace;background:#f1ebe6;padding:.12em .4em;border-radius:5px}
.prose pre{background:#171614;color:#f5efe9;padding:18px 20px;border-radius:var(--r);overflow:auto;font-size:14.5px;line-height:1.55}
.prose pre code{background:none;padding:0;color:inherit;font-size:inherit}
.prose blockquote{border-left:4px solid var(--primary);padding:4px 0 4px 18px;color:var(--text-2);font-style:italic}
.prose table{border-collapse:collapse;width:100%;font:15px 'DM Sans',sans-serif}
.prose th,.prose td{border:1px solid var(--border);padding:9px 12px;text-align:left}.prose th{background:#f3ece7}
.callout{padding:14px 18px;border-radius:var(--r);font:15.5px/1.55 'DM Sans',sans-serif;border:1px solid;border-left-width:5px}
.callout.tip{background:#f0fdf4;border-color:#bbf7d0;border-left-color:var(--ok)}
.callout.warn{background:#fffbeb;border-color:#fde68a;border-left-color:#f59e0b}
.callout.key{background:#eef2ff;border-color:#c7d2fe;border-left-color:var(--primary)}
.callout>:first-child{margin-top:0}.callout>:last-child{margin-bottom:0}
.prose details{border:1px solid var(--border);border-radius:var(--r);padding:12px 18px;background:#fff;font:16px/1.6 'DM Sans',sans-serif}
.prose details>summary{cursor:pointer;font-weight:700;color:var(--primary)}
.prose details[open]>summary{margin-bottom:10px}
.prose hr{border:0;border-top:1px solid var(--border);margin:2em 0}
.video{position:relative;aspect-ratio:16/9;margin-bottom:24px;border-radius:var(--r);overflow:hidden}
.video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.lesson-nav{display:flex;justify-content:space-between;align-items:center;gap:14px;margin-top:36px;padding-top:22px;border-top:1px solid var(--border)}
.notice,.flash{padding:13px 16px;border-radius:10px;background:#eef2ff;border:1px solid #c7d2fe;font-size:14.5px;margin:18px 0}
.notice a{color:var(--primary);font-weight:700;text-decoration:underline}
.flash-ok{background:#f0fdf4;border-color:#bbf7d0}.flash-error{background:#fef2f2;border-color:#fecaca}

/* Quiz */
.quiz fieldset{border:1px solid var(--border);border-radius:var(--r);background:var(--surface);padding:20px;margin:18px 0;display:grid;gap:10px}
.quiz legend{font:700 17px 'DM Sans',sans-serif;padding:0 8px;float:left;width:100%;margin-bottom:10px}
.quiz legend small{display:block;font-weight:500;font-size:12.5px;color:var(--text-3);margin-top:2px}
.qn{display:inline-grid;place-items:center;width:26px;height:26px;border-radius:50%;background:var(--primary);color:#fff;font-size:13px;margin-right:6px}
.opt{display:flex;gap:12px;align-items:flex-start;padding:12px 14px;border:1px solid var(--border);border-radius:10px;cursor:pointer;clear:both}
.opt:hover{border-color:var(--primary)}.opt input{margin-top:4px;accent-color:var(--primary)}
.opt:has(input:checked){border-color:var(--primary);background:rgba(109,40,217,.05)}
.result{display:flex;gap:22px;align-items:center;padding:22px;border-radius:var(--r);margin:20px 0;border:1px solid}
.result-ok{background:#f0fdf4;border-color:#bbf7d0}.result-ko{background:#fef2f2;border-color:#fecaca}
.result-score{font:900 44px 'Source Serif 4',serif}.result-ok .result-score{color:var(--ok)}.result-ko .result-score{color:var(--ko)}
.review{list-style:none;display:grid;gap:16px}
.review>li{background:var(--surface);border:1px solid var(--border);border-left:5px solid;border-radius:var(--r);padding:18px}
.review>li.ok{border-left-color:var(--ok)}.review>li.ko{border-left-color:var(--ko)}
.review .q{font-weight:700;margin-bottom:10px}
.answers{list-style:none;display:grid;gap:6px;font-size:15px}
.answers .right{color:var(--ok);font-weight:600}.answers .wrong{color:var(--ko);font-weight:600}
.answers li{color:var(--text-2)}.answers em{font-weight:400;font-size:12.5px}
.explain{margin-top:10px;font-size:14.5px;color:var(--text-2);background:#faf7f4;padding:10px 12px;border-radius:8px}

/* Certificate / forms / tables */
.cert{background:var(--surface);border:2px solid var(--primary);outline:1px solid #c4b5fd;outline-offset:-8px;border-radius:var(--r);padding:48px 32px;text-align:center;box-shadow:var(--shadow)}
.cert-badge{display:inline-flex;gap:8px;align-items:center;color:var(--ok);font-weight:700;margin-bottom:18px}
.cert h1{font-size:clamp(30px,5vw,46px);margin:6px 0 14px}.cert h2{font-size:24px;color:var(--primary);margin:6px 0 20px}
.cert-line{color:var(--text-2)}.cert .btn{margin-top:22px}
.form{display:grid;gap:10px}.form label{font-weight:600;font-size:14px}
.form input{padding:12px 14px;border:1px solid var(--border);border-radius:10px;font:16px 'DM Sans',sans-serif}
.cert-list{list-style:none;display:grid;gap:10px}
.cert-list li{display:flex;gap:12px;align-items:center;background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:12px 16px}
.cert-list li i{color:var(--primary)}.cert-list li span{flex:1;font-weight:600}.cert-list a{color:var(--primary);font-weight:600;font-size:14px}
.table-wrap{overflow:auto}.table{width:100%;border-collapse:collapse;background:var(--surface);border:1px solid var(--border);font-size:14px}
.table th,.table td{padding:10px 12px;border-bottom:1px solid var(--border);text-align:left}.table th{background:#f3ece7;font-size:12px;text-transform:uppercase;letter-spacing:.06em}
.pill{padding:3px 9px;border-radius:99px;font-size:12px;font-weight:700}.pill-published{background:#dcfce7;color:#166534}.pill-draft{background:#fef3c7;color:#92400e}

/* Ads + footer */
.ad-block{margin:36px 0;padding:14px 0;border-top:1px solid var(--border);border-bottom:1px solid var(--border);text-align:center;min-height:0}
.ad-label{display:block;font-size:10px;letter-spacing:.14em;text-transform:uppercase;color:var(--text-3);margin-bottom:6px}
.footer{background:#171614;color:#cfc7c0;padding:36px 0 18px;margin-top:40px}
.footer-inner{display:flex;justify-content:space-between;gap:30px;flex-wrap:wrap}
.footer strong{color:#fff}.footer p{font-size:14px;margin-top:6px}
.footer-links{display:flex;gap:20px;font-size:14px;align-items:flex-start}.footer-links a:hover{color:#fff}
.footer-copy{font-size:12px;margin-top:24px;color:#8a817a}

@media(max-width:960px){.layout,.layout-lesson{grid-template-columns:1fr}.side .panel{position:static}.layout-lesson .side-outline{order:2}.side-outline .panel{max-height:none}.grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:640px){.wrap,.topbar-inner{padding:0 18px}.nav{display:none}.topbar-right{margin-left:auto}.grid,.grid-rows{grid-template-columns:1fr}.hero{padding:44px 0 40px}.hero .search{flex-direction:column}.card-row{flex-direction:column}.card-row .card-img{width:auto;aspect-ratio:16/9}.prose{font-size:17px}.lesson-nav{flex-wrap:wrap}.result{flex-direction:column;text-align:center}}