:root{
  --bg:#eef2f9;
  --panel:#ffffff;
  --ink:#1b2333;
  --muted:#6b7688;
  --line:#e3e8f2;
  --brand:#1e3a8a;
  --radius:16px;
  --shadow:0 6px 20px rgba(23,43,99,.08);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",Roboto,sans-serif;
  color:var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, #e0e9ff 0%, transparent 55%),
    radial-gradient(1000px 500px at 110% 0%, #eaf5f1 0%, transparent 50%),
    var(--bg);
  min-height:100vh;
}
button{font-family:inherit;cursor:pointer;border:0;background:none;color:inherit}
input,textarea{font-family:inherit}

/* ================= 学员端 ================= */
.s-head{
  padding:18px 16px 10px;
  max-width:1180px;margin:0 auto;
}
.s-title{font-size:20px;font-weight:800;letter-spacing:.3px}
.s-sub{color:var(--muted);font-size:13px;margin-top:6px;line-height:1.5}
.s-progress{
  display:flex;align-items:center;gap:10px;margin-top:12px;
  background:var(--panel);border:1px solid var(--line);border-radius:999px;
  padding:8px 14px;box-shadow:var(--shadow);font-size:13px;color:var(--muted);
  width:fit-content;max-width:100%;
}
.s-progress b{color:var(--brand);font-size:15px}
.bar{flex:1;min-width:80px;height:8px;background:#e9eef7;border-radius:99px;overflow:hidden}
.bar i{display:block;height:100%;width:0;background:linear-gradient(90deg,#2563eb,#22c55e);border-radius:99px;transition:width .5s ease}

.board{max-width:1180px;margin:6px auto 150px;padding:0 12px}
.stage{margin-top:18px}
.stage-head{
  display:flex;align-items:center;gap:10px;padding:0 4px 8px;
}
.stage-ic{
  width:34px;height:34px;border-radius:10px;display:grid;place-items:center;font-size:17px;
  background:color-mix(in srgb, var(--c) 14%, white);
  border:1px solid color-mix(in srgb, var(--c) 30%, white);
}
.stage-name{font-weight:800;font-size:15px;color:var(--c)}
.stage-desc{font-size:11.5px;color:var(--muted);margin-top:1px}
.stage-count{margin-left:auto;font-size:11.5px;color:var(--muted);background:#fff;border:1px solid var(--line);padding:3px 9px;border-radius:99px}
.stage-count b{color:var(--c)}

.cards{display:grid;grid-template-columns:repeat(5,1fr);gap:10px}
@media(max-width:900px){.cards{grid-template-columns:repeat(3,1fr)}}
@media(max-width:520px){.cards{grid-template-columns:repeat(2,1fr)}}

.card{perspective:900px;height:104px;cursor:pointer;position:relative}
.card-inner{position:relative;width:100%;height:100%;transform-style:preserve-3d;transition:transform .55s cubic-bezier(.4,.2,.2,1)}
.card.flipped .card-inner{transform:rotateY(180deg)}
.face{
  position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;
  border-radius:var(--radius);padding:10px;display:flex;flex-direction:column;
  border:1.5px solid var(--line);background:var(--panel);box-shadow:var(--shadow);overflow:hidden;
}
.face.front{
  background:linear-gradient(150deg, color-mix(in srgb,var(--c) 12%, white), #fff 70%);
  align-items:flex-start;justify-content:space-between;
}
.face.front .code{font-size:11px;font-weight:800;color:var(--c);letter-spacing:.5px;
  background:color-mix(in srgb,var(--c) 12%, white);padding:2px 7px;border-radius:6px}
.face.front .num{font-size:30px;font-weight:900;color:color-mix(in srgb,var(--c) 65%, #6b7688);line-height:1;opacity:.55}
.face.front .tip{font-size:10.5px;color:var(--muted)}
.face.back{
  transform:rotateY(180deg);
  background:linear-gradient(160deg, var(--c), color-mix(in srgb,var(--c) 72%, #0b1220));
  border-color:transparent;color:#fff;justify-content:space-between;
}
.face.back .bcode{font-size:10.5px;font-weight:800;opacity:.85;letter-spacing:.5px}
.face.back .btitle{font-size:12.5px;font-weight:800;line-height:1.35}

.card.flipped .face.back{box-shadow:0 0 0 2px color-mix(in srgb,var(--c) 45%, white), 0 8px 22px color-mix(in srgb,var(--c) 35%, transparent)}
.card.lit .face.back{animation:pop .6s ease}
.card.lit::after{
  content:"✓";position:absolute;top:-7px;right:-6px;width:22px;height:22px;border-radius:50%;
  background:#22c55e;color:#fff;font-size:13px;font-weight:900;display:grid;place-items:center;
  box-shadow:0 3px 8px rgba(34,197,94,.5);z-index:5;animation:pop .5s ease;
}
.card.lit{filter:drop-shadow(0 0 10px color-mix(in srgb,var(--c) 45%, transparent))}
@keyframes pop{0%{transform:scale(.6)}60%{transform:scale(1.12)}100%{transform:scale(1)}}
@keyframes glow{0%,100%{box-shadow:0 0 0 0 color-mix(in srgb,var(--c) 55%, transparent)}50%{box-shadow:0 0 0 6px transparent}}

/* 输入条 */
.inputbar{
  position:fixed;left:0;right:0;bottom:0;z-index:40;
  background:linear-gradient(180deg, rgba(238,242,249,0), rgba(238,242,249,.92) 26%);
  padding:10px 12px calc(10px + env(safe-area-inset-bottom));
}
.inputbar .inner{
  max-width:780px;margin:0 auto;display:flex;gap:8px;align-items:center;
  background:var(--panel);border:1px solid var(--line);border-radius:16px;
  padding:8px;box-shadow:0 10px 30px rgba(23,43,99,.14);
}
.mic{
  width:44px;height:44px;flex:0 0 auto;border-radius:12px;display:grid;place-items:center;
  background:#eef4ff;color:#2563eb;font-size:20px;transition:.2s;
}
.mic.rec{background:#fee2e2;color:#dc2626;animation:glow 1.2s infinite}
.mic[disabled]{opacity:.4}
.inputbar input[type=text]{
  flex:1;border:0;outline:0;background:transparent;font-size:15px;padding:10px 6px;color:var(--ink);min-width:0;
}
.send{
  flex:0 0 auto;background:linear-gradient(135deg,#2563eb,#1d4ed8);color:#fff;font-weight:800;
  font-size:14px;padding:11px 18px;border-radius:12px;box-shadow:0 6px 16px rgba(37,99,235,.35);
}
.send:active{transform:translateY(1px)}
.send[disabled]{opacity:.5}
.mic-hint{max-width:780px;margin:6px auto 0;font-size:11.5px;color:var(--muted);text-align:center;min-height:15px}

/* 弹窗 */
.modal{position:fixed;inset:0;z-index:60;display:none;align-items:flex-end;justify-content:center;
  background:rgba(15,23,42,.45);backdrop-filter:blur(3px);padding:0}
.modal.show{display:flex;animation:fade .2s ease}
@keyframes fade{from{opacity:0}to{opacity:1}}
.modal .sheet{
  width:100%;max-width:560px;background:#fff;border-radius:22px 22px 0 0;
  padding:20px 20px calc(24px + env(safe-area-inset-bottom));animation:up .28s cubic-bezier(.3,.8,.3,1);
  max-height:88vh;overflow:auto;
}
@keyframes up{from{transform:translateY(40px);opacity:.6}to{transform:translateY(0);opacity:1}}
.mtag{display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:800;
  padding:5px 11px;border-radius:99px;background:color-mix(in srgb,var(--c) 14%, white);color:var(--c)}
.mblock{margin-top:14px}
.mlabel{font-size:12px;color:var(--muted);font-weight:700;margin-bottom:6px;display:flex;align-items:center;gap:6px}
.mlabel::before{content:"";width:4px;height:14px;border-radius:2px;background:var(--c)}
.mtext{background:#f7f9fd;border:1px solid var(--line);border-radius:12px;padding:12px 14px;font-size:14.5px;line-height:1.6}
.mtext.you{background:#fff7ed;border-color:#fed7aa}
.mclose{width:100%;margin-top:18px;background:#1e3a8a;color:#fff;font-weight:800;font-size:15px;padding:13px;border-radius:14px}
.mconf{font-size:11.5px;color:var(--muted);margin-top:10px;text-align:center}

/* toast */
.toast{position:fixed;left:50%;top:18px;transform:translateX(-50%) translateY(-14px);z-index:90;
  background:#1f2937;color:#fff;padding:10px 16px;border-radius:12px;font-size:13px;opacity:0;
  transition:.25s;pointer-events:none;max-width:90vw;text-align:center}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* ================= 管理端 ================= */
.admin-wrap{max-width:1080px;margin:0 auto;padding:20px 16px 60px}
.a-head{display:flex;align-items:center;gap:12px;padding:6px 0 16px}
.a-logo{width:40px;height:40px;border-radius:12px;background:linear-gradient(135deg,#1e3a8a,#2563eb);display:grid;place-items:center;color:#fff;font-weight:900}
.a-title{font-size:18px;font-weight:800}
.a-sub{font-size:12px;color:var(--muted)}
.tabs{display:flex;gap:6px;flex-wrap:wrap;background:#fff;border:1px solid var(--line);padding:6px;border-radius:14px;box-shadow:var(--shadow)}
.tab{padding:9px 14px;border-radius:10px;font-size:13.5px;font-weight:700;color:var(--muted)}
.tab.active{background:#1e3a8a;color:#fff}
.panel{background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);padding:18px;margin-top:16px}
.panel h3{margin:0 0 4px;font-size:15px}
.panel .hint{color:var(--muted);font-size:12.5px;margin-bottom:14px;line-height:1.55}
.field{margin-bottom:12px}
.field label{display:block;font-size:12.5px;font-weight:700;color:#374151;margin-bottom:5px}
.field input,.field select,.field textarea{
  width:100%;border:1px solid var(--line);border-radius:10px;padding:10px 12px;font-size:14px;outline:0;background:#fbfcfe;
}
.field input:focus,.field textarea:focus{border-color:#2563eb;background:#fff}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media(max-width:640px){.grid2{grid-template-columns:1fr}}
.btn{display:inline-flex;align-items:center;gap:7px;background:#1e3a8a;color:#fff;font-weight:800;font-size:13.5px;padding:10px 16px;border-radius:11px}
.btn.ghost{background:#fff;color:#1e3a8a;border:1px solid var(--line)}
.btn.danger{background:#dc2626}
.btn.sm{padding:7px 12px;font-size:12.5px;border-radius:9px}
.btn[disabled]{opacity:.5}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.tbl{width:100%;border-collapse:collapse;font-size:13px}
.tbl th,.tbl td{padding:9px 10px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.tbl th{color:var(--muted);font-weight:700;font-size:12px;background:#f7f9fd}
.tbl tr:hover td{background:#fbfcfe}
.pill{display:inline-block;padding:2px 9px;border-radius:99px;font-size:11.5px;font-weight:800;background:#eef2ff;color:#1e3a8a}
.qrow{display:flex;gap:10px;align-items:center;padding:10px 0;border-bottom:1px solid var(--line)}
.qrow .code{font-weight:900;color:#1e3a8a;width:42px;flex:0 0 auto;font-size:12px}
.qrow .bd{flex:1;min-width:0}
.qrow .t{font-weight:700;font-size:13.5px}
.qrow .d{font-size:12px;color:var(--muted);margin-top:2px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.login-card{max-width:380px;margin:12vh auto;background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);padding:26px}
.login-card h2{margin:0 0 4px;font-size:19px}
.login-card p{color:var(--muted);font-size:13px;margin:0 0 18px}
.stat{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.stat .box{background:#f7f9fd;border:1px solid var(--line);border-radius:12px;padding:14px}
.stat .n{font-size:22px;font-weight:900;color:#1e3a8a}
.stat .l{font-size:12px;color:var(--muted);margin-top:2px}
.qrbox{display:flex;gap:20px;flex-wrap:wrap;align-items:center}
.qrbox img{width:200px;height:200px;border:1px solid var(--line);border-radius:14px;background:#fff;padding:8px}
.urlpill{font-size:13px;background:#f7f9fd;border:1px dashed var(--line);border-radius:10px;padding:9px 12px;word-break:break-all}
@media(max-width:640px){.stat{grid-template-columns:1fr 1fr}}