:root{
  --bg:#f5fbfb;
  --card:#ffffff;
  --line:#d7ece8;
  --text:#1d2b36;
  --muted:#6e7d86;
  --primary:#4aa3ff;
  --primary2:#66c7b4;
  --soft:#eef8ff;
  --success:#2fa36b;
  --danger:#e25c5c;
  --warning:#d9a53b;
  --shadow:0 10px 30px rgba(37,78,112,.08);
  --radius:18px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;font-family:Arial,Helvetica,sans-serif;background:linear-gradient(180deg,#f8fdff,#eef7f6);color:var(--text)}
body{min-height:100vh}
a{text-decoration:none;color:inherit}
.layout{display:flex;min-height:100vh}
.sidebar{
  width:260px;background:#fff;border-right:1px solid var(--line);padding:20px 14px;
  position:fixed;left:0;top:0;bottom:0;overflow:auto;box-shadow:var(--shadow)
}
.brand{height:18px;margin-bottom:18px}
.nav a{
  display:flex;align-items:center;gap:10px;padding:12px 14px;border-radius:14px;margin-bottom:6px;
  color:#335;padding-left:16px;transition:.2s;background:transparent;border:1px solid transparent
}
.nav a:hover,.nav a.active{background:linear-gradient(135deg,#eef7ff,#eefcf8);border-color:#dceff5}
.nav small{color:var(--muted)}
.main{margin-left:260px;flex:1;min-width:0}
.topbar{
  display:flex;justify-content:space-between;align-items:center;padding:18px 24px;border-bottom:1px solid var(--line);
  position:sticky;top:0;background:rgba(248,253,255,.92);backdrop-filter:blur(8px);z-index:20
}
.page{padding:24px}
.cards{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow);
  animation:fadeIn .35s ease
}
.card h3,.card h4{margin:0 0 8px}
.stat-number{font-size:28px;font-weight:bold}
.muted{color:var(--muted)}
.table-wrap{overflow:auto;background:#fff;border-radius:var(--radius);border:1px solid var(--line);box-shadow:var(--shadow)}
table{width:100%;border-collapse:collapse;min-width:900px}
th,td{padding:12px 14px;border-bottom:1px solid #ebf2f5;text-align:left;font-size:14px;vertical-align:top}
th{background:#f7fbfd;color:#52626f}
.btn{
  border:none;background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;
  padding:11px 16px;border-radius:14px;cursor:pointer;font-weight:bold;box-shadow:var(--shadow)
}
.btn.secondary{background:#fff;color:#30404d;border:1px solid var(--line);box-shadow:none}
.btn.success{background:linear-gradient(135deg,#35ba75,#5bd6c1)}
.btn.danger{background:linear-gradient(135deg,#df6464,#f19b9b)}
.btn.warning{background:linear-gradient(135deg,#d8a542,#eccf79)}
.btn.block{display:block;width:100%}
.grid-2{display:grid;grid-template-columns:1.2fr .8fr;gap:16px}
.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
input,select,textarea{
  width:100%;padding:11px 12px;border:1px solid #d8e6ee;border-radius:12px;background:#fff;font-size:14px;outline:none
}
textarea{min-height:90px;resize:vertical}
label{font-size:13px;color:#54606a;margin-bottom:6px;display:block}
.form-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}
.form-grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.toolbar{display:flex;gap:10px;flex-wrap:wrap}
.badge{display:inline-block;padding:6px 10px;border-radius:999px;font-size:12px;font-weight:bold}
.badge.green{background:#e9f9f0;color:#268a59}
.badge.red{background:#ffeaea;color:#bf4747}
.badge.blue{background:#ebf4ff;color:#2a71d0}
.badge.yellow{background:#fff6df;color:#976f10}
.flex{display:flex;align-items:center}
.space-between{justify-content:space-between}
.gap{gap:10px}
.big-clock{font-size:42px;font-weight:bold;letter-spacing:1px}
.countdown{font-size:30px;font-weight:bold;color:#1e76c7}
.watermark{
  position:fixed;right:18px;bottom:12px;font-size:12px;color:rgba(68,101,123,.35);pointer-events:none;z-index:1
}
.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px}
.login-card{width:100%;max-width:460px;background:#fff;border:1px solid var(--line);border-radius:24px;box-shadow:var(--shadow);padding:28px}
.login-buttons{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:18px}
.hidden{display:none!important}
.kbd{background:#f2f7fa;border:1px solid #d6e4ec;border-radius:8px;padding:2px 6px}
.toast{
 position:fixed;right:18px;top:18px;background:#25333d;color:#fff;padding:14px 16px;border-radius:14px;box-shadow:var(--shadow);
 opacity:0;transform:translateY(-10px);pointer-events:none;transition:.25s;z-index:99;max-width:350px
}
.toast.show{opacity:1;transform:translateY(0)}
.audio-row{display:grid;grid-template-columns:1fr auto auto auto;gap:8px;align-items:center}
.fullscreen-panel{display:flex;align-items:center;justify-content:center;min-height:60vh;text-align:center}
.fullscreen-clock{font-size:86px;font-weight:bold}
.fullscreen-sub{font-size:28px;color:#5b6b76}
.note{padding:12px 14px;border-radius:14px;background:#f5fbff;border:1px solid #ddebfa;color:#4e6474}
@keyframes fadeIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
@media (max-width:1100px){
  .cards,.grid-4,.form-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid-2,.grid-3{grid-template-columns:1fr}
}
@media (max-width:860px){
  .sidebar{position:fixed;transform:translateX(-100%);transition:.25s;z-index:40}
  .sidebar.open{transform:translateX(0)}
  .main{margin-left:0}
  .topbar{padding:16px}
  .page{padding:16px}
  .cards,.grid-4,.grid-3,.form-grid,.form-grid-2,.login-buttons{grid-template-columns:1fr}
  .big-clock{font-size:34px}
  .fullscreen-clock{font-size:56px}
}