:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --ink: #1d2433;
  --ink-2: #55607a;
  --muted: #8b95ab;
  --line: #e6eaf3;
  --primary: #3b6ef5;
  --primary-d: #2b57d0;
  --primary-soft: #eaf0ff;
  --green: #16a34a;
  --red: #e5484d;
  --amber: #f59e0b;
  --radius: 14px;
  --shadow: 0 6px 24px rgba(24, 39, 75, .08);
  --shadow-sm: 0 2px 8px rgba(24, 39, 75, .06);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--primary); text-decoration: none; }
h1, h2, h3 { margin: 0 0 8px; font-weight: 700; }
h2 { font-size: 17px; }
button { font-family: inherit; }

/* ---------- 通用控件 ---------- */
.btn {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  padding: 9px 16px;
  border-radius: 10px;
  cursor: pointer;
  font-size: 14px;
  transition: .15s;
  white-space: nowrap;
}
.btn:hover { border-color: #cfd8ea; background: #fafbff; }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-d); border-color: var(--primary-d); }
.btn.danger { color: var(--red); border-color: #f6d4d5; background: #fff5f5; }
.btn.danger:hover { background: #ffeaea; }
.btn.ghost { background: transparent; }
.btn.small { padding: 6px 12px; font-size: 13px; border-radius: 8px; }
.btn.block { width: 100%; }
.btn:disabled { opacity: .55; cursor: not-allowed; }

input[type=text], input[type=password], input[type=search], select, textarea {
  width: 100%;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 14px;
  color: var(--ink);
  font-family: inherit;
  outline: none;
  transition: .15s;
}
input:focus, select:focus, textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }
textarea { resize: vertical; }

.row { display: flex; gap: 12px; align-items: flex-end; flex-wrap: wrap; margin-bottom: 12px; }
.row.right { justify-content: flex-end; }
.row:last-child { margin-bottom: 0; }
.spacer { flex: 1; }
.field { display: flex; flex-direction: column; gap: 6px; min-width: 180px; }
.field.grow { flex: 1; }
.field > span { font-size: 13px; color: var(--ink-2); }
.hint { color: var(--muted); font-size: 13px; margin: 4px 0 12px; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 18px;
  box-shadow: var(--shadow-sm);
}
.card.narrow { max-width: 420px; }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); }
th { color: var(--ink-2); font-weight: 600; font-size: 13px; background: #fafbff; }
tbody tr:hover { background: #fafbff; }
.badge { display: inline-block; padding: 2px 9px; border-radius: 999px; font-size: 12px; }
.badge.on { background: #e7f8ee; color: var(--green); }
.badge.off { background: #f0f2f7; color: var(--muted); }

.toast {
  position: fixed; left: 50%; top: 24px; transform: translateX(-50%);
  background: #16213a; color: #fff; padding: 11px 20px; border-radius: 10px;
  font-size: 14px; box-shadow: var(--shadow); z-index: 999; max-width: 80vw;
}
.toast.error { background: var(--red); }

/* ---------- 学生端 ---------- */
.student-page { background: linear-gradient(180deg, #eef3ff 0%, #f4f6fb 340px); min-height: 100vh; }
.site-header {
  display: flex; align-items: center; gap: 16px;
  padding: 16px 28px; max-width: 1100px; margin: 0 auto;
}
.brand { display: flex; align-items: center; gap: 9px; font-weight: 700; font-size: 16px; }
.brand .dot { width: 10px; height: 10px; border-radius: 50%; background: var(--primary); box-shadow: 0 0 0 4px var(--primary-soft); }
.class-name { margin-left: auto; font-weight: 600; color: var(--primary); background: #fff; padding: 6px 14px; border-radius: 999px; box-shadow: var(--shadow-sm); }

.wrap { max-width: 1100px; margin: 0 auto; padding: 8px 28px 60px; }

.hero {
  background: var(--card); border-radius: 18px; padding: 28px;
  box-shadow: var(--shadow); margin-bottom: 22px; text-align: center;
}
.hero h1 { font-size: 26px; }
.hero .sub { color: var(--ink-2); margin: 0 0 18px; }
.stat-row { display: flex; justify-content: center; gap: 40px; }
.stat { display: flex; flex-direction: column; }
.stat .num { font-size: 30px; font-weight: 800; color: var(--primary); font-variant-numeric: tabular-nums; }
.stat .label { font-size: 13px; color: var(--muted); }

.section-title { display: flex; align-items: baseline; gap: 12px; margin: 0 2px 14px; }
.section-title > span:first-child { font-weight: 700; font-size: 16px; }
.section-title .hint { margin: 0; }
.hint.live { display: inline-flex; align-items: center; gap: 6px; color: var(--green); }
.hint.live i { width: 7px; height: 7px; border-radius: 50%; background: var(--green); animation: pulse 1.6s infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: .25; } }

.candidates { margin-bottom: 26px; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 14px; }

.cand-card {
  position: relative; background: var(--card); border: 1.5px solid var(--line);
  border-radius: 14px; padding: 16px 18px; cursor: pointer;
  transition: .18s; overflow: hidden; box-shadow: var(--shadow-sm);
  width: 100%; text-align: left; font: inherit; color: inherit; display: block;
}
.cand-card:hover { transform: translateY(-2px); border-color: var(--primary); box-shadow: 0 10px 26px rgba(59,110,245,.16); }
.cand-card .name { font-size: 18px; font-weight: 700; display: flex; align-items: center; gap: 8px; }
.cand-card .no { font-size: 12px; color: var(--muted); font-weight: 400; }
.cand-card .meta { display: flex; align-items: baseline; gap: 6px; margin-top: 8px; }
.cand-card .votes { font-size: 22px; font-weight: 800; color: var(--primary); font-variant-numeric: tabular-nums; }
.cand-card .unit { font-size: 12px; color: var(--muted); }
.cand-card .bar { height: 8px; border-radius: 999px; background: var(--primary-soft); margin-top: 10px; overflow: hidden; }
.cand-card .bar > i { display: block; height: 100%; width: 0; border-radius: 999px; background: linear-gradient(90deg, #6f96ff, var(--primary)); transition: width .6s cubic-bezier(.2,.8,.2,1); }
.cand-card.selected { border-color: var(--green); background: #f4fdf7; }
.cand-card.selected .votes { color: var(--green); }
.cand-card.selected .bar > i { background: linear-gradient(90deg, #4ade80, var(--green)); }
.cand-card.disabled { cursor: not-allowed; opacity: .72; }
.cand-card.disabled:hover { transform: none; border-color: var(--line); box-shadow: var(--shadow-sm); }
.cand-card .tick { position: absolute; top: 10px; right: 12px; color: var(--green); font-weight: 700; font-size: 13px; }

.chart-block { background: var(--card); border-radius: 16px; padding: 20px 22px; box-shadow: var(--shadow-sm); }
.chart { display: grid; grid-template-columns: repeat(auto-fit, 78px); justify-content: center; align-items: end; gap: 20px 10px; min-height: 190px; padding: 10px 4px 0; }
.col { display: flex; flex-direction: column; align-items: center; justify-content: flex-end; min-height: 170px; }
.col .col-val { font-weight: 700; font-size: 14px; color: var(--primary); margin-bottom: 6px; font-variant-numeric: tabular-nums; }
.col .col-bar {
  width: 46px; min-height: 4px; height: 4px; border-radius: 8px 8px 4px 4px;
  background: linear-gradient(180deg, #7fa3ff, var(--primary));
  transition: height .6s cubic-bezier(.2,.8,.2,1); align-self: center;
}
.col.top .col-bar { background: linear-gradient(180deg, #ffd166, var(--amber)); }
.col .col-name { margin-top: 8px; font-size: 13px; color: var(--ink-2); max-width: 78px; text-align: center; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.empty { background: var(--card); border-radius: 16px; padding: 46px 20px; text-align: center; color: var(--muted); box-shadow: var(--shadow-sm); }
.empty b { display: block; font-size: 18px; color: var(--ink); margin-bottom: 6px; }

.site-footer { text-align: center; color: var(--muted); font-size: 13px; padding: 10px 20px 40px; }

.modal { position: fixed; inset: 0; background: rgba(15,23,42,.45); display: flex; align-items: center; justify-content: center; z-index: 100; padding: 20px; }
.modal-card { background: #fff; border-radius: 16px; padding: 26px; width: 100%; max-width: 400px; box-shadow: var(--shadow); }
.modal-card .warn { color: var(--red); font-size: 13px; }
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 20px; }

/* ---------- 管理端 ---------- */
.admin-page { background: var(--bg); min-height: 100vh; }
.login-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 20px; }
.login-card { background: #fff; border-radius: 18px; padding: 34px 30px; width: 100%; max-width: 380px; box-shadow: var(--shadow); }
.login-card h1 { font-size: 21px; }
.login-card .sub { color: var(--muted); margin: 0 0 20px; font-size: 14px; }
.login-card input { margin-bottom: 14px; }
.login-card .tip { font-size: 13px; color: var(--amber); margin: 14px 0 0; text-align: center; }

.admin-header {
  display: flex; align-items: center; padding: 14px 26px; background: #fff;
  border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 20;
}
.admin-header-actions { margin-left: auto; display: flex; gap: 10px; }
.admin-main { max-width: 1080px; margin: 0 auto; padding: 22px 26px 60px; }

.tabs { display: flex; gap: 6px; max-width: 1080px; margin: 18px auto 0; padding: 0 26px; flex-wrap: wrap; }
.tab { border: 1px solid var(--line); background: #fff; color: var(--ink-2); padding: 9px 16px; border-radius: 10px; cursor: pointer; font-size: 14px; }
.tab.active { background: var(--primary); border-color: var(--primary); color: #fff; font-weight: 600; }

.panel { display: none; }
.panel.active { display: block; animation: fade .2s; }
@keyframes fade { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }

.checklist { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 8px; max-height: 440px; overflow-y: auto; padding: 4px; }
.check-item { display: flex; align-items: center; gap: 9px; padding: 9px 12px; border: 1px solid var(--line); border-radius: 10px; cursor: pointer; background: #fff; font-size: 14px; transition: .12s; }
.check-item:hover { border-color: #cfd8ea; }
.check-item.checked { border-color: var(--primary); background: var(--primary-soft); }
.check-item input { width: 16px; height: 16px; accent-color: var(--primary); cursor: pointer; }
.check-item .no { color: var(--muted); font-size: 12px; margin-left: auto; }
.toolbar { display: flex; align-items: center; gap: 8px; margin: 12px 0 14px; flex-wrap: wrap; }
.counter { font-size: 13px; color: var(--ink-2); margin-left: 6px; }
.counter b { color: var(--primary); }

.paste-box { margin-top: 6px; border-top: 1px dashed var(--line); padding-top: 14px; }.paste-box summary { cursor: pointer; color: var(--primary); font-size: 14px; margin-bottom: 10px; }
.op-result { margin-top: 12px; font-size: 14px; padding: 10px 14px; border-radius: 10px; background: #e7f8ee; color: var(--green); }
.op-result.error { background: #fdecec; color: var(--red); }

/* 可搜索下拉：选择学生时支持滚动与输入过滤 */
.combo { position: relative; }
.combo-list {
  position: absolute; left: 0; right: 0; top: calc(100% + 4px); z-index: 30;
  background: #fff; border: 1px solid var(--line); border-radius: 10px;
  box-shadow: var(--shadow); max-height: 260px; overflow-y: auto; padding: 4px;
}
.combo-item { display: flex; align-items: center; gap: 8px; padding: 8px 12px; border-radius: 8px; cursor: pointer; font-size: 14px; }
.combo-item:hover { background: var(--primary-soft); }
.combo-item .no { color: var(--muted); font-size: 12px; margin-left: auto; }
.combo-empty { padding: 10px 12px; color: var(--muted); font-size: 13px; }

.admin-page .chart .col { flex-basis: 66px; }
.admin-page .chart .col-bar { background: linear-gradient(180deg, #7fa3ff, var(--primary)); }

@media (max-width: 640px) {
  .wrap, .admin-main { padding-left: 16px; padding-right: 16px; }
  .site-header { padding: 14px 16px; }
  .hero { padding: 22px 18px; }
  .stat-row { gap: 26px; }
  .tabs { padding: 0 16px; }
  .admin-header { padding: 12px 16px; }
}