:root{font-family:Inter,Arial,sans-serif;color:#1d2430;background:#f5f7fb}
*{box-sizing:border-box}
body{margin:0;display:grid;grid-template-columns:340px 1fr;min-height:100vh}
.sidebar{background:#111827;color:#fff;padding:22px;position:sticky;top:0;height:100vh;overflow:auto}
.eyebrow{font-size:12px;text-transform:uppercase;letter-spacing:.08em;color:#8dd3ff;margin-bottom:8px}
h1{font-size:24px;line-height:1.15;margin:0 0 18px}
#search{width:100%;height:42px;border:1px solid #334155;border-radius:8px;background:#0b1220;color:#fff;padding:0 12px;font-size:14px}
.module-link{display:block;width:100%;border:0;border-radius:8px;background:transparent;color:#dbeafe;text-align:left;padding:11px 10px;margin:6px 0;cursor:pointer;font-size:14px}
.module-link.active,.module-link:hover{background:#1f3b57;color:#fff}
main{padding:30px;overflow:auto}
.module-header{margin-bottom:22px}
.module-header h2{font-size:30px;margin:0 0 8px;color:#111827}
.meta{color:#64748b;font-size:14px}
.lesson{background:#fff;border:1px solid #d9e1ec;border-radius:8px;margin:0 0 18px;padding:20px;box-shadow:0 1px 2px rgba(15,23,42,.04)}
.lesson h3{font-size:21px;margin:0 0 14px;color:#111827}
.videos{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:14px;margin-top:8px}
video{width:100%;background:#000;border-radius:8px;aspect-ratio:16/9}
.video-missing{border:1px dashed #cbd5e1;border-radius:8px;padding:18px;color:#64748b;background:#f8fafc}
.attachments{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.attachment{display:inline-flex;align-items:center;gap:7px;border:1px solid #b7c6d8;border-radius:8px;padding:9px 11px;color:#0f3b66;text-decoration:none;background:#f8fbff;font-size:14px}
.empty{color:#64748b;background:#fff;border:1px solid #d9e1ec;border-radius:8px;padding:18px}
.admin-flags{background:#fff;border:1px solid #d9e1ec;border-radius:8px;margin:0 0 20px;padding:18px;display:grid;gap:14px}
.admin-flags h2{font-size:20px;margin:0 0 6px;color:#111827}
.admin-flags p{color:#64748b;line-height:1.45;margin:0}
.flag-links{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:8px}
.flag-link{border:1px solid #d9e1ec;border-radius:8px;padding:10px;background:#f8fafc;min-width:0}
.flag-link strong{display:block;color:#111827;font-size:13px;margin-bottom:5px}
.flag-link a{display:block;color:#0f3b66;font-size:12px;overflow-wrap:anywhere;text-decoration:none}
.save-state{color:#0f3b66;font-size:14px}
.active-flag{background:#e9f7ef;border:1px solid #b7dfc6;border-radius:8px;color:#14532d;margin:0 0 16px;padding:12px 14px}
.lesson-flags{border:1px solid #d9e1ec;border-radius:8px;background:#f8fafc;margin:0 0 14px;padding:12px;display:flex;flex-wrap:wrap;gap:8px}
.flag-title{width:100%;font-size:13px;font-weight:700;color:#334155}
.flag-check{display:inline-flex;align-items:center;gap:7px;border:1px solid #cbd5e1;border-radius:8px;background:#fff;padding:7px 9px;color:#334155;font-size:13px;cursor:pointer}
.flag-check input{margin:0}
.auth-page{display:grid;place-items:center;min-height:100vh;background:#f5f7fb;padding:22px}
.auth-panel{width:min(420px,100%);background:#fff;border:1px solid #d9e1ec;border-radius:8px;padding:24px;box-shadow:0 10px 30px rgba(15,23,42,.08)}
.auth-panel h1{color:#111827;margin-bottom:10px}
.auth-panel p{color:#64748b;line-height:1.45;margin:0 0 18px}
.auth-panel label{display:block;color:#334155;font-size:14px;margin:14px 0 6px}
.auth-panel input{width:100%;height:42px;border:1px solid #cbd5e1;border-radius:8px;padding:0 12px;font-size:15px}
.auth-panel button{width:100%;height:42px;border:0;border-radius:8px;background:#1f3b57;color:#fff;font-size:15px;cursor:pointer;margin-top:16px}
.auth-panel button:disabled{opacity:.6;cursor:wait}
.auth-message{min-height:20px;color:#0f3b66;font-size:14px;margin-top:12px}
mark{background:#fff1a8;padding:0 2px}
@media(max-width:880px){body{display:block}.sidebar{position:relative;height:auto}main{padding:18px}.videos{grid-template-columns:1fr}}