:root{
  --bg:#f5f7fb;
  --text:#0f172a;
  --muted:#64748b;
  --primary:#ef233c;
  --primary-dark:#d90429;
  --navy:#071a52;
  --navy-2:#0b2a77;
  --white:#ffffff;
  --line:#e5e7eb;
  --card:#ffffff;
  --shadow:0 12px 35px rgba(15,23,42,.10);
  --radius:24px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,Segoe UI,Arial,sans-serif;background:var(--bg);color:var(--text)}
a{text-decoration:none;color:inherit}
.container{width:min(1180px, calc(100% - 32px));margin:0 auto}
.topbar{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid #edf2f7}
.nav{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:14px 0}
.logo{display:flex;align-items:center;gap:12px;font-weight:800;font-size:1.05rem}
.logo-badge{width:46px;height:46px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,var(--primary),#ff5a6e);color:#fff;box-shadow:0 12px 24px rgba(239,35,60,.22)}
.menu{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.menu a{padding:10px 14px;border-radius:999px;color:#334155;font-weight:700}
.menu a:hover{background:#fff1f2;color:var(--primary)}
.menu .menu-cta{background:linear-gradient(135deg,var(--primary),#ff4d67);color:#fff;box-shadow:0 10px 20px rgba(239,35,60,.18)}
.hero{background:linear-gradient(90deg, rgba(7,26,82,.97) 0%, rgba(11,42,119,.94) 45%, rgba(7,26,82,.65) 100%);color:#fff}
.hero-wrap{min-height:430px;display:grid;grid-template-columns:1.05fr .95fr;gap:24px;align-items:center;padding:54px 0}
.hero-copy h1{font-size:clamp(2.5rem, 5vw, 4.2rem);line-height:1.02;margin:14px 0}
.hero-copy h1 span{color:#ff8ea0}
.hero-copy p{max-width:620px;font-size:1.15rem;line-height:1.7;color:#dbeafe}
.hero-badge{display:inline-flex;padding:9px 15px;border-radius:999px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.18);font-weight:700;font-size:.95rem}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:none;cursor:pointer;border-radius:16px;padding:14px 20px;font-weight:800;transition:.2s ease}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:linear-gradient(135deg,var(--primary),#ff4d67);color:#fff}
.btn-secondary{background:#fff;color:#0f172a;border:1px solid #dbe3ef}
.btn-danger{background:#fee2e2;color:#991b1b}
.btn-sm{padding:10px 14px;font-size:.92rem;border-radius:12px}
.hero-visual{min-height:320px;border-radius:30px;border:1px solid rgba(255,255,255,.10);background:radial-gradient(circle at 80% 20%, rgba(96,165,250,.7), transparent 14%), linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.03));position:relative;overflow:hidden}
.monitor{position:absolute;right:26px;top:26px;width:320px;height:180px;border-radius:18px;background:linear-gradient(135deg,#0f172a,#1d4ed8);border:6px solid rgba(255,255,255,.12);box-shadow:0 18px 38px rgba(2,6,23,.35)}
.monitor::after{content:"";position:absolute;bottom:-26px;left:50%;transform:translateX(-50%);width:90px;height:28px;border-radius:0 0 14px 14px;background:rgba(255,255,255,.16)}
.keyboard{position:absolute;right:90px;bottom:60px;width:280px;height:70px;border-radius:16px;background:linear-gradient(135deg,#111827,#0f172a);transform:skewX(-18deg);box-shadow:0 18px 28px rgba(2,6,23,.4)}
.mouse{position:absolute;right:24px;bottom:54px;width:74px;height:100px;border-radius:50px;background:linear-gradient(180deg,#1f2937,#0f172a);box-shadow:0 16px 24px rgba(2,6,23,.32)}
.floating{position:absolute;display:grid;place-items:center;width:72px;height:92px;border-radius:16px;border:2px solid rgba(255,255,255,.45);background:rgba(255,255,255,.06);color:#fff;font-size:2rem}
.f1{left:36px;top:44px}.f2{left:46px;top:156px}.f3{left:138px;top:156px}.f4{left:162px;top:66px}
.section{padding:38px 0 58px}
.section-heading{text-align:center;margin-bottom:24px}
.section-heading .eyebrow{color:var(--primary);text-transform:uppercase;letter-spacing:.18em;font-size:.82rem;font-weight:800}
.section-heading h2{margin:10px 0 8px;font-size:clamp(1.8rem,4vw,3rem)}
.section-heading p{margin:0;color:var(--muted);font-size:1.04rem}
.course-grid{display:grid;grid-template-columns:repeat(2, 1fr);gap:24px}
.course-card,.section-card,.material-card,.panel,.shortcut-box{background:var(--card);border:1px solid var(--line);border-radius:28px;box-shadow:var(--shadow)}
.course-card{position:relative;padding:28px}
.course-card.off{opacity:.48}
.course-ribbon{position:absolute;right:0;top:0;padding:14px 18px;border-radius:0 28px 0 18px;font-weight:800;color:#fff;background:linear-gradient(135deg,var(--primary),#ff4d67)}
.course-ribbon.off{background:#cbd5e1;color:#475569}
.course-main{display:flex;gap:18px;align-items:flex-start}
.course-icon{width:96px;height:96px;flex:none;border-radius:22px;display:grid;place-items:center;background:#fff1f2;color:var(--primary);font-size:3rem}
.course-card h3{margin:0 0 8px;font-size:1.2rem}
.course-card p{margin:0;color:#475569;line-height:1.7}
.course-actions{margin-top:22px}
.shortcut-box{padding:24px}
.shortcut-title{display:flex;align-items:center;gap:10px;font-size:1.5rem;font-weight:800;margin-bottom:18px}
.shortcut-grid{display:grid;grid-template-columns:repeat(4, 1fr);gap:16px}
.shortcut-item{background:#fff;border:1px solid #e7ecf3;border-radius:22px;padding:18px;display:flex;align-items:center;gap:14px;box-shadow:0 10px 24px rgba(15,23,42,.06)}
.shortcut-item .icon{font-size:2rem}
.shortcut-item h4{margin:0 0 5px;font-size:1.08rem}
.shortcut-item p{margin:0;color:var(--muted)}
.page-hero{padding:24px 0 8px}
.page-tag{display:inline-flex;align-items:center;gap:8px;color:#334155;font-weight:700;margin-bottom:8px}
.page-hero h1{font-size:clamp(2rem,4vw,3.3rem);margin:6px 0 10px}
.page-hero p{color:#475569;font-size:1.08rem;max-width:760px}
.stack{display:grid;gap:22px}
.section-card{padding:24px}
.section-head{display:flex;justify-content:space-between;align-items:center;gap:14px;flex-wrap:wrap;padding-bottom:14px;margin-bottom:16px;border-bottom:1px solid #eef2f7}
.section-badge{display:inline-flex;padding:8px 12px;border-radius:999px;background:#fff1f2;color:var(--primary);font-weight:800}
.small-muted{color:var(--muted);font-size:.95rem}
.material-grid{display:grid;grid-template-columns:repeat(2, 1fr);gap:16px}
.material-card{background:#fff;border:1px solid #e7ecf3;border-radius:22px;padding:18px;box-shadow:0 8px 22px rgba(15,23,42,.06);display:flex;flex-direction:column;gap:12px}
.meta{display:flex;gap:10px;flex-wrap:wrap;color:var(--muted);font-size:.9rem}
.video-wrap{position:relative;width:100%;padding-top:56.25%;overflow:hidden;border-radius:18px;border:1px solid #e5e7eb;background:#0f172a}
.video-wrap iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.empty{padding:22px;border:2px dashed #e2e8f0;border-radius:24px;color:var(--muted);text-align:center}
.login-shell,.admin-shell{min-height:100vh;background:radial-gradient(circle at top left, rgba(244,63,94,.10), transparent 25%),radial-gradient(circle at bottom right, rgba(220,38,38,.10), transparent 25%),linear-gradient(180deg,#fff5f5,#f8fafc)}
.login-wrap{min-height:100vh;display:grid;place-items:center;padding:24px}
.login-card,.panel{background:#fff;border:1px solid var(--line);border-radius:28px;box-shadow:var(--shadow)}
.login-card{width:min(460px,100%);padding:28px}
.admin-wrap{width:min(1240px, calc(100% - 32px));margin:0 auto;padding:30px 0 60px}
.admin-header{display:flex;justify-content:space-between;align-items:center;gap:18px;margin-bottom:24px}
.tabs{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:18px}
.tablink{padding:10px 14px;border-radius:999px;border:1px solid var(--line);background:#fff;font-weight:800}
.tablink.active{background:#fff1f2;color:var(--primary);border-color:#fecdd3}
.admin-grid{display:grid;grid-template-columns:390px 1fr;gap:22px}
.panel{padding:22px}
.field{display:flex;flex-direction:column;gap:8px;margin-bottom:16px}
.field label{font-weight:700;color:#334155}
.input,.textarea,.select{width:100%;padding:14px 15px;border:1px solid #dbe3ef;border-radius:16px;background:#fff;font:inherit}
.textarea{min-height:120px;resize:vertical}
.notice{padding:14px 16px;border-radius:16px;margin-bottom:16px;font-weight:700}
.notice-success{background:#dcfce7;color:#166534}
.notice-error{background:#fee2e2;color:#991b1b}
.table-wrap{overflow:auto}
table{width:100%;border-collapse:collapse}
th,td{padding:13px 10px;border-bottom:1px solid #eef2f7;text-align:left;vertical-align:top}
th{color:#475569;font-size:.92rem}
.file-note{padding:12px 14px;border-radius:14px;background:#f8fafc;border:1px solid #e2e8f0;color:#475569;font-size:.92rem}
.footer{padding:26px 0 48px;text-align:center;color:var(--muted)}
@media (max-width:1000px){.hero-wrap,.course-grid,.shortcut-grid,.material-grid,.admin-grid{grid-template-columns:1fr}}
@media (max-width:640px){.menu{display:none}.hero-copy h1{font-size:2.5rem}}