/* 南孚风格：橙红 + 金黄 + 纯白卡片 */
:root{
  --nf-red:#e60012;
  --nf-red-dark:#b8000e;
  --nf-gold:#ffc709;
  --nf-gold-dark:#f0a800;
  --nf-black:#1a1a1a;
  --nf-gray:#6b7280;
  --nf-line:#ececec;
  --nf-bg:#f5f5f7;
  --nf-shadow:0 2px 8px rgba(0,0,0,.06);
  --nf-shadow-lg:0 6px 20px rgba(230,0,18,.18);
}

*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  font-family:-apple-system,"PingFang SC","Microsoft YaHei",Roboto,sans-serif;
  background:var(--nf-bg);color:var(--nf-black);
  font-size:15px;-webkit-font-smoothing:antialiased;
}

/* ===== 顶部栏 ===== */
header{
  display:flex;justify-content:space-between;align-items:center;
  padding:14px 18px;
  background:linear-gradient(135deg,var(--nf-red) 0%,var(--nf-red-dark) 100%);
  color:#fff;position:sticky;top:0;z-index:10;
  box-shadow:0 2px 12px rgba(230,0,18,.25);
}
header h1{font-size:18px;margin:0;font-weight:800;letter-spacing:.5px}
.meta{font-size:12px;opacity:.92;display:block;margin-top:2px}
#agent-status{color:#ffb4b4;font-size:10px;vertical-align:middle}
#agent-status.on{color:var(--nf-gold);text-shadow:0 0 6px rgba(255,199,9,.8)}
.logout{
  color:#fff;font-size:13px;text-decoration:none;
  border:1.5px solid rgba(255,255,255,.45);
  padding:6px 14px;border-radius:999px;font-weight:600;
  transition:background .15s;
}
.logout:active{background:rgba(255,255,255,.15)}

/* ===== 视频 ===== */
.video-wrap{
  background:#000;width:100%;aspect-ratio:16/9;
  overflow:hidden;border-bottom:3px solid var(--nf-gold);
}
#video{width:100%;height:100%;object-fit:cover}

/* ===== 面板卡片 ===== */
.panel{
  background:#fff;margin:12px;padding:16px;
  border-radius:16px;box-shadow:var(--nf-shadow);
  border:1px solid var(--nf-line);
}
.panel strong{font-size:15px;font-weight:800;color:var(--nf-black)}

/* ===== 主要按钮（叫号） ===== */
.btn-row{display:flex;gap:12px}
.big{
  flex:1;padding:20px 0;font-size:18px;font-weight:800;
  border:none;border-radius:12px;cursor:pointer;
  font-family:inherit;letter-spacing:1px;
  transition:transform .08s,box-shadow .15s;
}
.big:active{transform:scale(.96)}
.big.primary{
  background:linear-gradient(135deg,var(--nf-red) 0%,#ff3a28 100%);
  color:#fff;box-shadow:var(--nf-shadow-lg);
}
.big:not(.primary){
  background:linear-gradient(135deg,var(--nf-gold) 0%,var(--nf-gold-dark) 100%);
  color:var(--nf-black);box-shadow:0 4px 14px rgba(255,199,9,.35);
}

/* ===== 当前叫号显示 ===== */
.current{
  margin-top:16px;padding:22px 16px;text-align:center;
  font-size:24px;font-weight:800;
  color:var(--nf-red);
  background:linear-gradient(135deg,#fff8f7 0%,#ffefed 100%);
  border:2px dashed var(--nf-red);border-radius:14px;
  min-height:36px;
}
.current .sid{
  display:inline-block;background:var(--nf-red);color:#fff;
  padding:4px 12px;border-radius:999px;
  font-size:16px;margin-right:10px;vertical-align:middle;
}
.current .hint{
  display:block;font-size:12px;font-weight:500;
  color:var(--nf-gray);margin-top:8px;
}

/* ===== 喊话输入行 ===== */
.id-row{display:flex;gap:10px;margin-top:14px}
.id-row input{
  flex:1;padding:13px 14px;font-size:15px;
  border:1.5px solid var(--nf-line);border-radius:10px;
  background:#fafafa;font-family:inherit;
  transition:border-color .15s,background .15s;
}
.id-row input:focus{
  outline:none;border-color:var(--nf-red);background:#fff;
}
.id-row button{
  padding:0 20px;border:none;border-radius:10px;
  background:var(--nf-black);color:var(--nf-gold);
  font-size:15px;font-weight:700;cursor:pointer;
  font-family:inherit;transition:transform .08s;
}
.id-row button:active{transform:scale(.96)}

/* ===== 名单 & 上传 ===== */
.row-between{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}
.upload-btn{
  padding:8px 16px;
  background:linear-gradient(135deg,var(--nf-gold) 0%,var(--nf-gold-dark) 100%);
  color:var(--nf-black);border-radius:999px;
  font-size:13px;font-weight:700;cursor:pointer;
  box-shadow:0 2px 8px rgba(255,199,9,.35);
}
.upload-btn:active{transform:scale(.96)}

.roster-grid{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(88px,1fr));
  gap:10px;
}
.stu-btn{
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:4px;min-height:72px;padding:12px 8px;
  border:1.5px solid var(--nf-line);border-radius:12px;
  background:#fff;color:var(--nf-black);
  font-family:inherit;cursor:pointer;
  transition:transform .08s,background .15s,border-color .15s,box-shadow .15s;
  position:relative;overflow:hidden;
}
.stu-btn::before{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg,var(--nf-red),var(--nf-gold));
  opacity:0;transition:opacity .15s;
}
.stu-btn:active{
  transform:scale(.94);
  background:#fff5f3;border-color:var(--nf-red);
  box-shadow:0 4px 14px rgba(230,0,18,.2);
}
.stu-btn:active::before{opacity:1}
.stu-btn .stu-id{
  font-size:11px;color:var(--nf-gray);font-weight:600;
  letter-spacing:.5px;
}
.stu-btn .stu-name{
  font-size:16px;font-weight:800;color:var(--nf-black);
  line-height:1.15;text-align:center;word-break:break-all;
}

/* ===== 历史记录 ===== */
ul{list-style:none;margin:10px 0 0;padding:0}
#history li{
  padding:12px 6px;border-bottom:1px solid var(--nf-line);
  font-size:15px;display:flex;justify-content:space-between;align-items:center;
}
#history li:last-child{border-bottom:none}
#history li::before{
  content:"●";color:var(--nf-red);margin-right:8px;font-size:10px;
}
.time{color:var(--nf-gray);font-size:12px;font-variant-numeric:tabular-nums}

/* ===== 登录页 ===== */
.login-body{
  background:linear-gradient(135deg,var(--nf-red) 0%,var(--nf-red-dark) 60%,#7a000a 100%);
  min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px;
  position:relative;overflow:hidden;
}
.login-body::before{
  content:"";position:absolute;top:-120px;right:-120px;
  width:300px;height:300px;border-radius:50%;
  background:radial-gradient(circle,var(--nf-gold) 0%,transparent 70%);
  opacity:.25;
}
.login-body::after{
  content:"";position:absolute;bottom:-100px;left:-100px;
  width:260px;height:260px;border-radius:50%;
  background:radial-gradient(circle,var(--nf-gold) 0%,transparent 70%);
  opacity:.18;
}
.login-card{
  background:#fff;padding:36px 28px;border-radius:20px;
  width:100%;max-width:380px;
  box-shadow:0 20px 60px rgba(0,0,0,.35);
  position:relative;z-index:1;
  border-top:5px solid var(--nf-gold);
}
.login-card h1{
  margin:0 0 6px;font-size:24px;text-align:center;
  color:var(--nf-red);font-weight:900;letter-spacing:1px;
}
.login-card .sub{
  text-align:center;color:var(--nf-gray);
  margin:0 0 26px;font-size:13px;
}
.login-card label{
  display:block;font-size:13px;color:#444;
  margin-bottom:16px;font-weight:600;
}
.login-card input{
  width:100%;margin-top:8px;padding:14px;
  border:1.5px solid var(--nf-line);border-radius:10px;
  font-size:16px;background:#fafafa;font-family:inherit;
  transition:border-color .15s,background .15s;
}
.login-card input:focus{
  outline:none;border-color:var(--nf-red);background:#fff;
}
.login-card button,.login-card input[type=submit]{
  width:100%;padding:15px;margin-top:8px;border:none;
  border-radius:12px;font-size:16px;font-weight:800;
  background:linear-gradient(135deg,var(--nf-red) 0%,#ff3a28 100%);
  color:#fff;cursor:pointer;letter-spacing:2px;
  box-shadow:var(--nf-shadow-lg);font-family:inherit;
  transition:transform .08s;
}
.login-card button:active,.login-card input[type=submit]:active{transform:scale(.98)}
.err{color:var(--nf-red);font-size:13px;margin-bottom:14px;text-align:center;font-weight:600}

/* ===== 切换教室头部按钮 ===== */
.header-btns{display:flex;gap:8px;align-items:center}
#btn-switch{background:rgba(255,255,255,.1);cursor:pointer}
#btn-switch:active{background:rgba(255,255,255,.2)}

/* ===== 通用弹窗 ===== */
.modal{
  position:fixed;inset:0;background:rgba(0,0,0,.5);
  display:flex;align-items:center;justify-content:center;
  z-index:100;padding:20px;
}
.modal.hidden{display:none}
.modal-card{
  background:#fff;border-radius:16px;padding:24px;
  width:100%;max-width:420px;max-height:85vh;overflow-y:auto;
  box-shadow:0 20px 60px rgba(0,0,0,.3);
  border-top:5px solid var(--nf-gold);
}
.modal-card h3{margin:0 0 12px;color:var(--nf-red);font-size:17px}
.modal-card hr{border:none;border-top:1px solid var(--nf-line);margin:18px 0}
.form-grid{display:flex;flex-direction:column;gap:10px}
.form-grid label{font-size:13px;color:#444;font-weight:600}
.form-grid input{
  width:100%;margin-top:6px;padding:11px 12px;
  border:1.5px solid var(--nf-line);border-radius:10px;
  font-size:15px;background:#fafafa;font-family:inherit;
}
.form-grid input:focus{outline:none;border-color:var(--nf-red);background:#fff}
.modal-btns{display:flex;gap:10px;margin-top:14px}
.modal-btns .big{padding:14px 0;font-size:15px}

/* 我的教室列表 */
.my-rooms{list-style:none;padding:0;margin:0}
.my-rooms li{
  display:flex;align-items:center;justify-content:space-between;
  padding:12px;border:1.5px solid var(--nf-line);border-radius:12px;
  margin-bottom:10px;flex-wrap:wrap;gap:8px;
}
.my-rooms li.active{border-color:var(--nf-red);background:#fff5f3}
.my-rooms .r-name{font-weight:800;font-size:15px;color:var(--nf-black);flex:1;min-width:100px}
.my-rooms .r-id{font-size:11px;color:var(--nf-gray);font-family:monospace}
.my-rooms .r-ops{display:flex;gap:6px;align-items:center}
.my-rooms .r-ops button{
  padding:6px 12px;border:1.5px solid var(--nf-red);
  background:#fff;color:var(--nf-red);border-radius:999px;
  font-size:12px;font-weight:700;cursor:pointer;font-family:inherit;
}
.my-rooms .r-ops button[data-act="remove"]{border-color:var(--nf-gray);color:var(--nf-gray)}
.my-rooms .r-cur{
  padding:6px 12px;background:var(--nf-red);color:#fff;
  border-radius:999px;font-size:12px;font-weight:700;
}

/* ===== 移动端收紧 ===== */
@media (max-width:480px){
  .panel{margin:10px;padding:14px;border-radius:14px}
  .big{padding:18px 0;font-size:17px}
  .current{font-size:22px;padding:18px 12px}
  .roster-grid{grid-template-columns:repeat(auto-fill,minmax(78px,1fr));gap:8px}
  .stu-btn{min-height:66px;padding:10px 6px}
  .stu-btn .stu-name{font-size:15px}
  header h1{font-size:16px}
}