:root{--blue:#2563eb;--dark:#111827;--muted:#6b7280;--line:#e5e7eb;--bg:#f3f6fb;--card:#fff}
*{box-sizing:border-box} body{margin:0;font-family:Segoe UI,Arial,sans-serif;background:var(--bg);color:#111827} a{text-decoration:none;color:inherit}.top{height:56px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:18px;padding:0 22px;position:sticky;top:0;z-index:5}.brand{font-weight:800;font-size:20px;color:var(--blue)}.nav{display:flex;gap:8px}.nav a{padding:8px 12px;border-radius:10px;color:#374151}.nav a:hover,.nav a.active{background:#eff6ff;color:var(--blue)}.spacer{flex:1}.btn{border:0;background:var(--blue);color:white;padding:10px 14px;border-radius:10px;font-weight:700;cursor:pointer}.btn.light{background:#eef2ff;color:#1e40af}.btn.red{background:#dc2626}.wrap{max-width:1180px;margin:24px auto;padding:0 18px}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:16px}.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:18px;box-shadow:0 8px 22px #00000008}.hero{background:linear-gradient(135deg,#2563eb,#06b6d4);color:white;border-radius:24px;padding:28px;margin-bottom:18px}.muted{color:var(--muted)}.app-card{display:block;min-height:145px}.app-icon{font-size:40px}.files table,.admin table{width:100%;border-collapse:collapse;background:white;border-radius:16px;overflow:hidden}.files th,.files td,.admin th,.admin td{border-bottom:1px solid var(--line);padding:12px;text-align:left}.login{min-height:100vh;display:grid;place-items:center;background:linear-gradient(135deg,#e0f2fe,#eff6ff)}.loginbox{background:white;width:min(420px,92vw);padding:28px;border-radius:24px;box-shadow:0 25px 70px #0002}.input,select,textarea{width:100%;padding:12px;border:1px solid var(--line);border-radius:10px;margin:6px 0 12px}.ribbon{background:white;border-bottom:1px solid var(--line);padding:10px;display:flex;gap:8px;flex-wrap:wrap;position:sticky;top:56px;z-index:4}.ribbon button,.ribbon select,.ribbon input{padding:8px;border:1px solid var(--line);border-radius:8px;background:white}.editor-page{max-width:900px;margin:24px auto;background:white;min-height:900px;padding:60px;box-shadow:0 10px 40px #0002}.sheet{overflow:auto;background:white;border:1px solid var(--line);border-radius:14px}.sheet table{border-collapse:collapse}.sheet th,.sheet td{border:1px solid #d1d5db;min-width:90px;height:32px;padding:4px}.sheet td{background:white}.slides-layout{display:grid;grid-template-columns:210px 1fr;gap:16px}.thumb{background:white;border:2px solid var(--line);border-radius:10px;padding:14px;margin-bottom:10px;cursor:pointer}.slide-canvas{background:white;aspect-ratio:16/9;border-radius:16px;box-shadow:0 12px 35px #0002;padding:50px;font-size:28px}.badge{display:inline-block;background:#eef2ff;color:#1e40af;border-radius:999px;padding:4px 9px;font-size:12px}.progress{height:10px;border-radius:999px;background:#e5e7eb;overflow:hidden}.bar{height:100%;background:var(--blue)}