:root{--ink:#17332d;--cream:#f6f3ea;--gold:#b78d47;--line:#d8e1dd;--muted:#6b7b76;--white:#fff}
*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Arial,sans-serif;color:var(--ink);background:#fbfcfb}
a{color:inherit;text-decoration:none}.top{background:#fff;border-bottom:1px solid var(--line);padding:16px 24px;display:flex;justify-content:space-between;align-items:center;position:sticky;top:0;z-index:3}
.brand{font-weight:900}.brand small{display:block;color:var(--muted);font-weight:500}.nav{display:flex;gap:18px;align-items:center}.container{max-width:1180px;margin:auto;padding:38px 24px}
.hero{background:var(--cream);border-radius:24px;padding:34px;margin-bottom:30px}.hero h1{font-family:Georgia,serif;font-size:44px;margin:0 0 10px}.muted{color:var(--muted)}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px}.card h3{margin-top:0;font-family:Georgia,serif;font-size:25px}.btn{display:inline-block;background:var(--ink);color:#fff;padding:11px 16px;border:0;border-radius:999px;font-weight:800;cursor:pointer}.btn.alt{background:#fff;color:var(--ink);border:1px solid var(--ink)}
.badge{display:inline-block;background:#e2ebe6;padding:5px 9px;border-radius:999px;font-size:12px;font-weight:800}.locked{opacity:.55}.progress{height:9px;background:#edf1ef;border-radius:999px;overflow:hidden}.progress span{display:block;height:100%;background:var(--gold)}
.course-layout{display:grid;grid-template-columns:290px 1fr;gap:25px}.side{background:#fff;border:1px solid var(--line);border-radius:16px;padding:15px;height:max-content;position:sticky;top:88px}.side a{display:block;padding:9px;border-radius:8px}.side a:hover{background:var(--cream)}
.lesson-body{background:#fff;border:1px solid var(--line);border-radius:18px;padding:30px}.lesson-body h1,.lesson-body h2{font-family:Georgia,serif}.timer{padding:13px;background:var(--cream);border-radius:10px;margin:20px 0}
.quiz-q{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;margin:15px 0}.quiz-q label{display:block;padding:7px}.alert{padding:15px;border-radius:12px;background:#fff3d8;border:1px solid #ecd18e}.ok{background:#e4f3e8;border-color:#b8d7bf}
input,select,textarea{width:100%;padding:12px;border:1px solid #bdcbc5;border-radius:10px;font:inherit}.form-row{margin-bottom:14px}.two{display:grid;grid-template-columns:1fr 1fr;gap:18px}
table{width:100%;border-collapse:collapse;background:#fff}th,td{padding:12px;text-align:left;border-bottom:1px solid var(--line)}
@media(max-width:850px){.grid,.course-layout,.two{grid-template-columns:1fr}.side{position:static}.nav{font-size:13px;gap:9px}.hero h1{font-size:35px}}