:root{--navy:#071b45;--blue:#1d63ff;--bg:#f5f7fb;--text:#14213d;--muted:#69768c;--line:#e4e9f2;--white:#fff;--radius:18px}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,Arial,sans-serif}.container{max-width:1180px;margin:auto;padding:24px}.topbar{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:blur(16px);border-bottom:1px solid var(--line)}.nav{display:flex;align-items:center;gap:24px;max-width:1180px;margin:auto;padding:14px 24px}.brand{font-weight:850;color:var(--navy);text-decoration:none;font-size:20px}.nav a{color:#41516c;text-decoration:none}.nav .spacer{flex:1}.btn{display:inline-flex;align-items:center;justify-content:center;padding:11px 16px;border-radius:11px;border:0;background:var(--navy);color:#fff;text-decoration:none;font-weight:700;cursor:pointer}.btn.secondary{background:#edf2fb;color:var(--navy)}.btn.blue{background:var(--blue)}.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:0 10px 34px rgba(30,50,90,.05)}.hero{padding:56px 0;display:grid;grid-template-columns:1.3fr .7fr;gap:28px;align-items:center}.hero h1{font-size:52px;line-height:1.04;margin:0 0 18px;color:var(--navy)}.hero p{font-size:19px;color:var(--muted)}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.course-card{overflow:hidden;padding:0}.cover{height:160px;background:linear-gradient(135deg,#e8efff,#f5f2ff);display:flex;align-items:center;justify-content:center;font-weight:800;color:var(--navy)}.course-body{padding:18px}.badge{display:inline-block;border-radius:999px;padding:5px 9px;background:#edf2ff;color:#204a9c;font-size:12px;font-weight:800}.muted{color:var(--muted)}h1,h2,h3{color:var(--navy)}input,select,textarea{width:100%;padding:12px 13px;border:1px solid #d8dfeb;border-radius:10px;background:#fff;font:inherit}label{display:block;font-weight:700;margin:12px 0 7px}.form{max-width:560px}.flash{padding:13px 16px;border-radius:10px;margin:15px 0}.flash.error{background:#fff0f0;color:#9b1c1c}.flash.success{background:#edf9f1;color:#166534}.table-wrap{overflow:auto}.table{width:100%;border-collapse:collapse}.table th,.table td{padding:12px;border-bottom:1px solid var(--line);text-align:left;white-space:nowrap}.admin-shell{display:grid;grid-template-columns:250px 1fr;min-height:calc(100vh - 64px)}.sidebar{background:#fff;border-right:1px solid var(--line);padding:20px}.sidebar a{display:block;padding:10px 12px;border-radius:9px;text-decoration:none;color:#44526a;margin:3px 0}.sidebar a:hover{background:#f1f4fa;color:var(--navy)}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.stat strong{display:block;font-size:28px;margin-top:8px}.player-layout{display:grid;grid-template-columns:1fr 330px;gap:18px}.video{aspect-ratio:16/9;background:#071426;color:#fff;border-radius:16px;overflow:hidden}.video video{width:100%;height:100%}.lesson-list a{display:block;padding:12px;border-bottom:1px solid var(--line);text-decoration:none;color:var(--text)}.lesson-list a.active{background:#eef3ff}.price-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}.price{font-size:32px;font-weight:850}.footer{padding:40px 24px;text-align:center;color:var(--muted)}@media(max-width:800px){.hero{grid-template-columns:1fr}.hero h1{font-size:38px}.grid,.stats,.price-grid{grid-template-columns:1fr}.admin-shell{grid-template-columns:1fr}.sidebar{display:flex;overflow:auto;gap:5px}.sidebar a{white-space:nowrap}.player-layout{grid-template-columns:1fr}.nav{gap:12px;overflow:auto}.nav a{white-space:nowrap}}