/* ==========================================================================
   Radio Light · 盐中之声校园广播站歌曲投票平台
   极简冷调 / 全实色分层 / 高级克制（Linear、Notion 质感）
   浅色：页面 #FFFFFF · 卡片 #FAFAFA · 分割线 #E5E7EB · 主色 #2563EB
   深色：页面 #111827 · 卡片 #1F2937 · 分割线 #374151 · 主色 #3B82F6
   间距 8 基数（4/8/16/24/32/48）；圆角 按钮 8 / 卡片 12
   ========================================================================== */

:root {
  color-scheme: light;
  --page: #FFFFFF;
  --card: #FAFAFA;
  --line: #E5E7EB;
  --line-soft: #F3F4F6;
  --fill: #F3F4F6;
  --fill-strong: #E5E7EB;
  --primary: #2563EB;
  --primary-hover: #1D4ED8;
  --primary-soft: #EFF6FF;
  --title: #111827;
  --body: #374151;
  --secondary: #6B7280;
  --muted: #9CA3AF;
  --danger: #DC2626;
  --danger-hover: #B91C1C;
  --on-primary: #FFFFFF;

  --radius-btn: 8px;
  --radius-card: 12px;

  --shadow-xs: 0 1px 2px rgba(17, 24, 39, .05);
  --shadow-card: 0 1px 3px rgba(17, 24, 39, .05), 0 1px 2px rgba(17, 24, 39, .03);
  --shadow-hover: 0 4px 12px rgba(17, 24, 39, .08), 0 1px 3px rgba(17, 24, 39, .05);
  --shadow-pop: 0 12px 32px rgba(17, 24, 39, .14), 0 2px 8px rgba(17, 24, 39, .06);

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  --glass-bg: rgba(255, 255, 255, .8);
  --chip: rgba(244, 244, 245, .7);
  --chip-hover: rgba(232, 232, 235, .88);
  --chip-shadow: inset 0 1px 0 rgba(255, 255, 255, .7), 0 1px 2px rgba(17, 24, 39, .07);
  --glass-line: rgba(17, 24, 39, .08);
  --backdrop: rgba(17, 24, 39, .42);
  --track: #F3F4F6;
  --seg-active: #FFFFFF;
  --nav-active: #EFF6FF;
  --focus-ring: 0 0 0 3px rgba(37, 99, 235, .14);
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --page: #111827;
    --card: #1F2937;
    --line: #374151;
    --line-soft: #2B3544;
    --fill: #374151;
    --fill-strong: #4B5563;
    --primary: #3B82F6;
    --primary-hover: #60A5FA;
    --primary-soft: #1E3A8A;
    --title: #F9FAFB;
    --body: #D1D5DB;
    --secondary: #9CA3AF;
    --muted: #6B7280;
    --danger: #F87171;
    --danger-hover: #FCA5A5;
    --on-primary: #FFFFFF;

    --shadow-xs: 0 1px 2px rgba(0, 0, 0, .35);
    --shadow-card: 0 1px 3px rgba(0, 0, 0, .3);
    --shadow-hover: 0 4px 14px rgba(0, 0, 0, .4);
    --shadow-pop: 0 12px 32px rgba(0, 0, 0, .5);

    --glass-bg: rgba(17, 24, 39, .82);
    --chip: rgba(55, 65, 81, .66);
    --chip-hover: rgba(75, 85, 99, .84);
    --chip-shadow: inset 0 1px 0 rgba(255, 255, 255, .07), 0 1px 2px rgba(0, 0, 0, .35);
    --glass-line: rgba(249, 250, 251, .08);
    --backdrop: rgba(0, 0, 0, .55);
    --track: #1F2937;
    --seg-active: #374151;
    --nav-active: #1E3A8A;
    --focus-ring: 0 0 0 3px rgba(59, 130, 246, .28);
  }
}

/* ---------- 重置与排版 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }
html { min-width: 320px; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.6;
  color: var(--body);
  background: var(--page);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img { max-width: 100%; }
h1 { font-size: 28px; font-weight: 600; line-height: 1.25; letter-spacing: -.01em; color: var(--title); margin: 0 0 8px; }
h2 { font-size: 20px; font-weight: 600; line-height: 1.3; color: var(--title); margin: 0 0 8px; }
h3 { font-size: 16px; font-weight: 500; line-height: 1.4; color: var(--title); margin: 0 0 4px; }
h4 { font-size: 14px; font-weight: 600; color: var(--title); margin: 0 0 8px; }
p { margin: 0 0 8px; }
a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-hover); }
ol, ul { margin: 0; }
audio { width: 100%; height: 40px; }
button { font-family: inherit; }
input, select, textarea { font-family: inherit; }

.muted { color: var(--secondary); font-size: 12px; }
.kicker {
  margin: 0 0 12px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muted);
}
.message { margin: 8px 0 0; font-size: 13px; color: var(--secondary); }

/* ---------- 布局 ---------- */
.shell {
  max-width: 1040px;
  min-height: 100vh;
  margin: 0 auto;
  padding: 0 16px 48px;
}
.form-wrap { max-width: 560px; margin: 48px auto 0; }
.form-wrap.wide { max-width: 720px; }
.grid { display: grid; grid-template-columns: 1fr; gap: 24px; margin-top: 8px; }
.list { display: flex; flex-direction: column; gap: 12px; }
.wide { width: 100%; }

/* ---------- 顶部导航（克制毛玻璃 + 0.5px 发丝线） ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: 0 -16px;
  padding: 10px 16px;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(14px) saturate(1.5);
  backdrop-filter: blur(14px) saturate(1.5);
  box-shadow: inset 0 -.5px 0 var(--glass-line);
}
.brand { display: flex; align-items: center; gap: 10px; min-width: 0; color: inherit; }
.brand:hover { color: inherit; text-decoration: none; }
.brand-mark { display: block; flex: 0 0 auto; width: 32px; height: 32px; border-radius: 8px; object-fit: contain; }
.brand strong { display: block; font-size: 15px; font-weight: 600; line-height: 1.2; letter-spacing: -.01em; color: var(--title); white-space: nowrap; }
.brand small { display: block; font-size: 11px; line-height: 1.3; letter-spacing: .06em; color: var(--muted); white-space: nowrap; }
.topbar .actions { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; justify-content: flex-end; }
.nav-links { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }

/* ---------- 按钮（实色 / 微立体，一律无描边） ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 36px;
  padding: 0 14px;
  border: 0;
  border-radius: var(--radius-btn);
  font-size: 14px;
  font-weight: 500;
  line-height: 1;
  color: var(--title);
  background: var(--chip);
  -webkit-backdrop-filter: blur(10px) saturate(1.4);
  backdrop-filter: blur(10px) saturate(1.4);
  box-shadow: var(--chip-shadow);
  cursor: pointer;
  white-space: nowrap;
  text-decoration: none;
  transition: background-color .15s ease, color .15s ease, box-shadow .15s ease, transform .15s ease;
  -webkit-appearance: none;
  appearance: none;
}
.btn:hover { background: var(--chip-hover); color: var(--title); text-decoration: none; }
.btn:active { transform: translateY(.5px); box-shadow: inset 0 1px 0 rgba(255, 255, 255, .4); }
.btn:disabled { opacity: .45; cursor: not-allowed; pointer-events: none; }

.btn.primary {
  color: var(--on-primary);
  background: var(--primary);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .18), 0 1px 3px rgba(37, 99, 235, .28);
}
.btn.primary:hover { background: var(--primary-hover); }

.btn.quiet { background: transparent; -webkit-backdrop-filter: none; backdrop-filter: none; box-shadow: none; color: var(--secondary); }
.btn.quiet:hover { background: var(--chip); color: var(--title); }

.btn.danger { color: #FFFFFF; background: var(--danger); box-shadow: inset 0 1px 0 rgba(255, 255, 255, .16), 0 1px 3px rgba(220, 38, 38, .25); }
.btn.danger:hover { background: var(--danger-hover); }

/* 顶部导航：次要项用轻玻璃（悬停加厚），退出最安静 —— 全灰实心块会显得"毛坯" */
.topbar .nav-links .btn:not(.primary) { color: var(--body); }
.topbar .nav-links .btn:not(.primary):hover { color: var(--title); }
.topbar .actions > .btn.quiet { background: transparent; box-shadow: none; color: var(--muted); }
.topbar .actions > .btn.quiet:hover { background: var(--chip); box-shadow: var(--chip-shadow); color: var(--title); }

.dialog-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 32px;
  height: 32px;
  padding: 0;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--secondary);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
}
.dialog-close:hover { background: var(--chip); color: var(--title); }

/* ---------- 表单 ---------- */
.field { display: block; margin: 0 0 16px; }
.field > label { display: block; margin-bottom: 6px; font-size: 12px; font-weight: 500; color: var(--secondary); }
.input {
  width: 100%;
  height: 40px;
  padding: 0 12px;
  font-size: 14px;
  color: var(--title);
  background: var(--page);
  border: 1px solid var(--line);
  border-radius: var(--radius-btn);
  transition: border-color .15s ease, box-shadow .15s ease;
  -webkit-appearance: none;
  appearance: none;
}
textarea.input { height: auto; min-height: 96px; padding: 10px 12px; line-height: 1.6; resize: vertical; }
select.input {
  padding-right: 34px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%236B7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 15px 15px;
}
.input::placeholder { color: var(--muted); }
.input:hover { border-color: var(--muted); }
.input:focus { outline: none; border-color: var(--primary); box-shadow: var(--focus-ring); }
.form-actions { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin: 16px 0 0; }
.settings-form { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin: 12px 0 0; }
.settings-form .input { flex: 1 1 145px; min-width: 0; }

/* ---------- 卡片与面板 ---------- */
.form-card,
.panel,
.settings-card,
.week,
.announcement,
.song,
.rules,
.report-card,
.suggestion-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
}
.form-card { padding: 32px 28px; margin: 0; }
.form-card .brand-mark { width: 44px; height: 44px; margin-bottom: 20px; border-radius: 10px; }
.panel { padding: 20px; }
.panel-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin: 0 0 16px; }
.panel-head h2, .panel-head h3 { margin: 0; }
.toolbar { display: flex; flex-wrap: wrap; align-items: flex-end; gap: 12px; margin: 4px 0 16px; }
.toolbar .field { flex: 1 1 150px; margin: 0; }
.toolbar .input { min-width: 0; }
.admin-toolbar:empty { display: none; }

/* ---------- 首页 Hero（居中 + 信号标） ---------- */
.hero { padding: 48px 0 32px; text-align: center; }
.signal-mark { position: relative; width: 24px; height: 6px; margin: 0 auto 20px; }
.signal-mark::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--primary);
}
.signal-mark::after {
  content: "";
  position: absolute;
  right: 0;
  top: 2.5px;
  width: 14px;
  height: 1px;
  background: var(--primary);
}
.hero .kicker { margin-bottom: 16px; }
.hero h1 { max-width: 560px; margin: 0 auto 8px; }
.hero > p { max-width: 460px; margin: 0 auto; color: var(--secondary); }

/* ---------- 状态通知条（实色 + 圆点） ---------- */
.notice {
  position: relative;
  margin: 0 0 12px;
  padding: 12px 16px 12px 38px;
  background: var(--fill);
  border-radius: var(--radius-card);
  color: var(--body);
  font-size: 13px;
}
.notice::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 50%;
  width: 8px;
  height: 8px;
  margin-top: -4px;
  border-radius: 50%;
  background: var(--primary);
}
.notice[hidden] { display: none; }

.identity-line { margin: 20px 0 16px; font-size: 12px; color: var(--muted); }
.identity-line strong { font-weight: 500; color: var(--secondary); }

/* ---------- 公告 ---------- */
.section-title { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin: 24px 0 16px; }
.section-title h2 { margin: 0; }
.announcement-stack { display: flex; flex-direction: column; gap: 12px; margin: 0 0 8px; }
.announcement { padding: 16px 20px; }
.announcement .kicker { margin-bottom: 6px; }
.announcement h3 { margin: 0 0 6px; }
.announcement p:last-child { margin: 0; font-size: 13px; color: var(--body); white-space: pre-wrap; }

/* ---------- 榜单切换（现版行为：容器隐藏，两榜并排；保留以兼容脚本） ---------- */
.rank-tabs { display: none; }
.rank-tabs button {
  height: 32px;
  padding: 0 16px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--secondary);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
}
.rank-tabs button.active { background: var(--seg-active); color: var(--title); box-shadow: var(--shadow-xs); }

/* ---------- 歌曲卡片 ---------- */
.song {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  transition: transform .16s ease, box-shadow .16s ease, border-color .16s ease;
}
.song:hover { transform: translateY(-1px); box-shadow: var(--shadow-hover); }
.song > div:first-child { flex: 1 1 auto; min-width: 0; }
.song h3 { margin: 0 0 2px; overflow-wrap: anywhere; }
.song p { margin: 0; font-size: 13px; color: var(--secondary); }
.song-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 12px; }
.song-actions .btn { height: 32px; padding: 0 12px; font-size: 13px; }
.song-side { flex: 0 0 auto; text-align: right; }
.votes { font-size: 18px; font-weight: 600; letter-spacing: -.01em; color: var(--primary); white-space: nowrap; }
.song .inline-player { margin-top: 8px; }
.song .inline-player:empty { display: none; }
button.song { width: 100%; text-align: left; cursor: pointer; }
button.song > span:last-child { flex: 0 0 auto; font-size: 13px; color: var(--secondary); }
.track-option { align-items: center; cursor: default; }
.track-option > div:first-child { min-width: 0; }
.track-option small { display: block; margin-top: 3px; }
.track-option .song-actions { margin-top: 9px; }
.track-option > .muted { max-width: 150px; text-align: right; }
.inline-player audio { display: block; margin-top: 4px; }

/* ---------- 投稿页 ---------- */
.form-card h1 { font-size: 24px; }
.form-card > p { margin-bottom: 20px; color: var(--secondary); }
#picked { margin: 0 0 16px; padding: 10px 12px; border-radius: 8px; background: var(--fill); font-size: 13px; color: var(--secondary); }

/* ---------- 投稿须知 / 免责声明（折叠面板，默认收起） ---------- */
.rules { margin: 24px 0 0; overflow: hidden; }
.rules summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 500;
  color: var(--title);
  cursor: pointer;
  user-select: none;
  list-style: none;
}
.rules summary::-webkit-details-marker { display: none; }
.rules summary::after { content: "+"; font-size: 16px; line-height: 1; color: var(--muted); }
.rules[open] summary::after { content: "−"; }
.rules summary:hover { color: var(--primary); }
.rules ol { margin: 0; padding: 0 20px 20px 40px; }
.rules li { margin: 0 0 6px; font-size: 13px; line-height: 1.7; color: var(--body); }
.rules + .rules { margin-top: 12px; }

/* ---------- 排期 ---------- */
.schedule-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
.week { min-width: 0; padding: 20px; }
.week.current { border-color: var(--primary); }
.week h2 { display: flex; align-items: center; justify-content: space-between; gap: 8px; font-size: 16px; }
.week h2 .muted { font-weight: 400; }
.slot-title { margin: 16px 0 4px; font-size: 12px; font-weight: 500; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.slot { display: flex; align-items: baseline; gap: 12px; padding: 10px 0; border-top: 1px solid var(--line-soft); }
.slot:first-of-type { border-top: 0; }
.slot b { flex: 0 0 16px; font-size: 12px; font-weight: 500; color: var(--muted); }
.slot > div { min-width: 0; font-size: 14px; color: var(--title); }
.slot > div span { display: block; font-size: 12px; color: var(--secondary); }
.slot .btn { margin-left: auto; }

/* ---------- 后台 ---------- */
.admin-layout { display: grid; grid-template-columns: 1fr; gap: 16px; align-items: start; }
.admin-nav { display: flex; flex-wrap: wrap; gap: 4px; padding: 8px; }
.admin-nav button {
  flex: 1 1 auto;
  min-width: 96px;
  height: 36px;
  padding: 0 12px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--secondary);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: background-color .15s ease, color .15s ease;
}
.admin-nav button:hover { background: var(--fill); color: var(--title); }
.admin-nav button.active { background: var(--nav-active); color: var(--primary); }
.admin-row { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; padding: 16px 0; border-top: 1px solid var(--line-soft); }
.admin-row:first-child { border-top: 0; padding-top: 0; }
.admin-row > div:first-child { flex: 1 1 auto; min-width: 0; }
.admin-row .muted { margin-top: 2px; }
.admin-row .actions { display: flex; flex-wrap: wrap; flex: 0 0 auto; gap: 8px; }
.admin-song { align-items: flex-start; }
.admin-song-info { flex: 1; min-width: 0; }
.admin-song .actions { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 8px; }
.admin-song .song-actions { margin-top: 10px; }
.admin-row .input { height: 32px; width: auto; min-width: 120px; }
.category-select { display: inline-block; width: auto; min-width: 130px; height: 32px; }
.admin-schedule { margin-top: 16px; }
.admin-schedule .week { padding: 16px; }
.admin-schedule .slot { align-items: center; }
.inbox { margin: 14px 0; }
.inbox h3 { margin-bottom: 10px; }
.report-card, .suggestion-card { padding: 16px; margin: 10px 0; }
.report-card ul { margin: 8px 0; padding-left: 20px; color: var(--secondary); }
.report-card li { font-size: 13px; }
.suggestion-card p { margin: 6px 0; font-size: 13px; }

/* ---------- 设置 ---------- */
.settings-grid { display: grid; grid-template-columns: 1fr; gap: 14px; }
.settings-card { min-width: 0; padding: 20px; }
.settings-card h3 { margin-bottom: 8px; }
.settings-card > .btn { margin-top: 14px; }
.settings-card .admin-row { flex-wrap: wrap; }
.settings-card .admin-row > div { flex: 1 1 100%; }
.settings-class { padding: 14px 0; border-top: 1px solid var(--line-soft); }
.settings-class:first-child { border-top: 0; padding-top: 0; }
.settings-class-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 12px; }
.settings-class .settings-form { margin-top: 9px; }
.settings-class .btn { height: 32px; padding: 0 12px; font-size: 13px; }
.class-settings-list { margin-top: 12px; }
.weight-form { display: flex; align-items: center; gap: 8px; }
.weight-input { width: 80px !important; min-width: 0 !important; }

/* ---------- 页脚 ---------- */
.footer { margin-top: 48px; padding: 24px 0 0; border-top: 1px solid var(--line); text-align: center; font-size: 12px; color: var(--secondary); }
#beianFooter { display: grid; gap: 6px; justify-items: center; line-height: 1.9; }
.beian-row { display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 4px 8px; }
.beian-row a { display: inline-flex; align-items: center; gap: 4px; color: var(--secondary); }
.beian-row a:hover { color: var(--title); }
.beian-row img { display: block; flex: 0 0 auto; vertical-align: -2px; }
.beian-sep { color: var(--muted); }
.beian-copy { color: var(--secondary); }
.site-version { color: var(--muted); }
.admin-entry { justify-self: center; color: var(--muted); }
.admin-entry:hover { color: var(--primary); }

/* ---------- 登录门 ---------- */
.gate-wrap { display: flex; align-items: center; justify-content: center; min-height: 76vh; padding: 32px 0; }
.gate { width: 100%; max-width: 400px; padding: 32px 28px; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-card); box-shadow: var(--shadow-card); }
.gate .brand-mark { width: 44px; height: 44px; margin-bottom: 20px; border-radius: 10px; }
.gate h1 { font-size: 24px; }
.gate > p { margin-bottom: 20px; color: var(--secondary); }
.gate .form-actions .btn { flex: 1 1 auto; }
.gate .announcement-stack { margin-top: 16px; }
.gate .announcement { padding: 12px 14px; }

/* ---------- 发布页（landing） ---------- */
.landing { display: flex; flex-direction: column; min-height: 100vh; padding-bottom: 0; }
.landing-top { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 20px 0 8px; }
.landing-top .muted { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.landing-hero { flex: 1 1 auto; display: flex; flex-direction: column; padding: 16px 0 0; }
.hero-center { flex: 1 1 auto; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; padding: 32px 0; }
.hero-center h1 { max-width: 760px; font-size: clamp(27px, 5.2vw, 52px); letter-spacing: -.02em; margin: 0 0 12px; text-wrap: balance; }
.hero-center > p { max-width: 520px; color: var(--secondary); font-size: 15px; }
/* 「进入」：右下角，但在页脚那一片之上（与底部分隔出明显留白） */
.landing-cta { display: flex; justify-content: flex-end; padding: 8px 0 64px; }
.enter-btn { height: 52px; padding: 0 26px; font-size: 16px; border-radius: 12px; }
.landing-footer { padding-top: 24px; }

/* ---------- 弹窗（克制毛玻璃） ---------- */
dialog.glass-dialog,
dialog.rl-confirm {
  position: relative;
  width: calc(100vw - 32px);
  max-width: 440px;
  max-height: 85vh;
  overflow: auto;
  padding: 24px;
  border: 0;
  border-radius: var(--radius-card);
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(18px) saturate(1.6);
  backdrop-filter: blur(18px) saturate(1.6);
  box-shadow: var(--shadow-pop);
  color: var(--body);
}
dialog.track-dialog {
  width: calc(100vw - 24px);
  max-width: 640px;
  max-height: min(82vh, 760px);
  overflow: hidden;
  padding: 0;
  border: 0;
  border-radius: var(--radius-card);
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(18px) saturate(1.6);
  backdrop-filter: blur(18px) saturate(1.6);
  box-shadow: var(--shadow-pop);
  color: var(--body);
}
dialog::backdrop { background: var(--backdrop); }
dialog[open] { animation: dialogIn .18s ease; }
@keyframes dialogIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

.rl-confirm h2 { margin: 0 0 8px; font-size: 18px; }
.rl-confirm p { margin: 0 0 20px; font-size: 13px; color: var(--secondary); white-space: pre-wrap; }
.dialog-actions { display: flex; justify-content: flex-end; gap: 8px; }
.glass-dialog.notice-dialog { display: grid; gap: 12px; }
.glass-dialog.notice-dialog .notice-body { margin: 0; color: var(--secondary); white-space: pre-wrap; }
.glass-dialog.notice-dialog .btn { justify-self: end; }
.track-dialog-head { position: sticky; top: 0; z-index: 1; display: flex; align-items: center; justify-content: space-between; gap: 14px; padding: 20px 24px 16px; border-bottom: 1px solid var(--line); background: var(--card); }
.track-dialog-head h2 { margin: 2px 0; padding-right: 32px; font-size: 20px; }
.track-results { display: flex; flex-direction: column; gap: 10px; max-height: calc(min(82vh, 760px) - 96px); overflow-y: auto; overscroll-behavior: contain; padding: 16px 20px 22px; }
#dialogContent h2 { margin-bottom: 12px; }
#announcementForm { display: grid; gap: 10px; margin-bottom: 18px; }

/* ---------- 轻提示 ---------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  z-index: 90;
  transform: translateX(-50%);
  max-width: calc(100vw - 32px);
  padding: 10px 16px;
  border-radius: var(--radius-btn);
  background: #111827;
  color: #F9FAFB;
  font-size: 13px;
  box-shadow: var(--shadow-pop);
  animation: toastIn .2s ease;
}
@keyframes toastIn { from { opacity: 0; transform: translate(-50%, 8px); } to { opacity: 1; transform: translate(-50%, 0); } }
@media (prefers-color-scheme: dark) { .toast { background: #374151; } }

/* ---------- 人机验证提示 ---------- */
.verification-note {
  position: fixed;
  z-index: 20;
  left: 50%;
  bottom: 24px;
  display: flex;
  align-items: center;
  gap: 10px;
  width: max-content;
  max-width: min(560px, calc(100vw - 28px));
  padding: 12px 16px;
  border-radius: var(--radius-card);
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(16px) saturate(1.5);
  backdrop-filter: blur(16px) saturate(1.5);
  box-shadow: inset 0 0 0 1px var(--glass-line), var(--shadow-card);
  font-size: 13px;
  line-height: 1.45;
  color: var(--secondary);
  transform: translateX(-50%);
  animation: toastIn .22s ease;
}
.verification-note[hidden] { display: none; }
.verification-paw { display: inline-flex; flex: none; color: var(--primary); animation: pawSpin 1.2s linear infinite; }
@keyframes pawSpin { to { transform: rotate(360deg); } }

/* ---------- reCAPTCHA ---------- */
.grecaptcha-badge { visibility: hidden !important; }
.recaptcha-disclosure { margin: 24px auto 0; font-size: 11px; color: var(--muted); text-align: center; }
.recaptcha-disclosure a { color: inherit; text-decoration: underline; }

/* ---------- 无障碍 ---------- */
:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 4px; }
input:focus-visible, select:focus-visible, textarea:focus-visible { outline: none; }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
  .song:hover { transform: none; }
  .verification-paw { animation: none; }
}

/* ---------- 触控设备：按钮回到 44px 底线 ---------- */
@media (pointer: coarse) {
  .btn { height: 44px; padding: 0 16px; }
  .song-actions .btn, .admin-nav button, .track-option .btn { height: 40px; }
  .dialog-close { width: 40px; height: 40px; }
}

/* ---------- 手机（≤640） ---------- */
@media (max-width: 640px) {
  .shell { padding: 0 16px 40px; }
  .form-wrap { margin-top: 32px; }
  .hero { padding: 36px 0 28px; }
  h1, .hero h1, .form-card h1, .gate h1 { font-size: 24px; }
  /* 纵向节奏整体放宽：卡片更厚、区块间距更大，避免"上下都挤" */
  .identity-line { margin: 24px 0 20px; }
  .grid { gap: 28px; }
  .list { gap: 14px; }
  .song { padding: 18px 20px; }
  .song-actions { margin-top: 14px; gap: 10px; }
  .song-actions .btn { height: 40px; padding: 0 14px; }
  .song .inline-player { margin-top: 12px; }
  .panel { padding: 20px 18px; }
  .panel-head { margin-bottom: 18px; }
  .notice { margin-bottom: 14px; padding: 13px 16px 13px 38px; }
  .announcement { padding: 16px 18px; }
  .form-card { padding: 26px 20px; }
  .gate { padding: 26px 20px; }
  .field { margin-bottom: 18px; }
  .form-actions { gap: 10px; margin-top: 20px; }
  .rules { margin-top: 28px; }
  .rules summary { padding: 18px 20px; }
  .rules ol { padding: 0 20px 22px 40px; }
  .page-head { align-items: flex-start; flex-direction: column; padding: 24px 0 6px; }
  .week { padding: 20px 18px; }
  .slot { padding: 12px 0; }
  .settings-card { padding: 20px 18px; }
  .footer { margin-top: 40px; padding-top: 20px; }
  .song { flex-wrap: wrap; }
  .song-side { margin-left: auto; }
  .btn { height: 40px; }
  .btn.quiet { padding: 0 10px; }
  /* 导航分两行：品牌一行（退出靠右），导航按钮独立一行 —— 四个按钮挤在一起会互相压叠 */
  .topbar { flex-wrap: wrap; row-gap: 10px; padding: 10px 16px 12px; }
  .topbar .actions { width: 100%; justify-content: space-between; gap: 10px; }
  .nav-links { gap: 8px; }
  .topbar .actions .btn { height: 38px; padding: 0 14px; font-size: 13px; }
  .topbar .actions .btn.quiet { padding: 0 10px; }
  .admin-nav button { min-width: 88px; }
  .landing-top { padding: 14px 0 4px; }
  .landing-top .muted { display: none; }
  .hero-center { padding: 24px 0; }
  .hero-center > p { font-size: 14px; }
  .landing-cta { padding: 4px 0 48px; }
  .enter-btn { height: 48px; padding: 0 22px; font-size: 15px; }
  .verification-note { bottom: 14px; font-size: 12px; }
  .track-dialog { max-height: 86vh; }
  .track-dialog-head { padding: 15px 16px 12px; }
  .track-results { max-height: calc(86vh - 88px); padding: 12px; }
  .track-option { flex-wrap: wrap; padding: 13px; }
  .track-option > .muted { max-width: none; text-align: left; }
}

/* ---------- 平板（641–1023） ---------- */
@media (min-width: 641px) {
  .shell { padding: 0 24px 56px; }
  .topbar { margin: 0 -24px; padding: 10px 24px; }
  .schedule-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .settings-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* ---------- 桌面（≥1024） ---------- */
@media (min-width: 1024px) {
  .shell { max-width: 1080px; padding: 0 32px 64px; }
  .topbar { margin: 0 -32px; padding: 12px 32px; }
  .hero { padding: 56px 0 40px; }
  .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px; }
  .admin-layout { grid-template-columns: 220px minmax(0, 1fr); gap: 24px; }
  .admin-nav { position: sticky; top: 76px; flex-direction: column; }
  .admin-nav button { flex: 0 0 auto; width: 100%; text-align: left; }
  .schedule-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

/* ---------- 全屏（≥1440） ---------- */
@media (min-width: 1440px) {
  .shell { max-width: 1200px; }
  .hero { padding: 72px 0 48px; }
  .hero h1 { font-size: 32px; }
  .grid { gap: 40px; }
  .schedule-grid { gap: 20px; }
  .list { gap: 14px; }
}