/* ══════════════════════════════════════════════
   main.css — Stepstone 全局设计系统
   ══════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

/* ── 设计 Token — Grand Salon ───────────────── */
:root {
  /* 背景层次：暗森林绿 */
  --bg:          #09130D;
  --surface:     #101C14;
  --surface-2:   #172A1E;
  --surface-3:   #1E3528;
  /* 牌桌绒布 */
  --felt:        #0D3222;
  --felt-2:      #114030;
  /* 古铜金强调 */
  --gold:        #C9A84C;
  --gold-light:  #E5C86A;
  --gold-dark:   #8C7232;
  /* 文字：羊皮纸白 */
  --text:        #EDE8DC;
  --text-muted:  #9AAD96;
  --text-faint:  #4F6050;
  /* 语义色 */
  --red:         #C0392B;
  --red-soft:    #E05C5C;
  --green:       #27AE60;
  --warning:     #D4830A;
  /* NS/EW 方位色 */
  --ns-color:    #3AACBF;   /* 水鸭蓝 = 南北 */
  --ew-color:    #A07EDE;   /* 紫罗兰 = 东西 */
  /* 庄家/明手标签色 */
  --declarer-color: #5BBFD0;
  --dummy-color:    #B088E8;
  /* 边框与阴影 */
  --border:      rgba(201,168,76,.12);
  --border-glow: rgba(201,168,76,.32);
  --shadow-sm:   0 2px 8px rgba(0,0,0,.65);
  --shadow-md:   0 8px 32px rgba(0,0,0,.75);
  --shadow-lg:   0 16px 60px rgba(0,0,0,.85);
  --radius:      12px;
  --radius-sm:   8px;
  --radius-xs:   4px;
  --font:        'Inter', system-ui, sans-serif;
  /* 响应式卡牌尺寸：高度也要限制，防止小窗口截断 */
  --card-w: clamp(32px, min(4.2vw, 6.5vh), 64px);
  --card-h: calc(var(--card-w) * 1.481);
}

/* ── Reset ──────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
button { font-family: var(--font); cursor: pointer; border: none; outline: none; }
input, textarea { font-family: var(--font); }
.hidden { display: none !important; }

/* ── 大厅页 Body ────────────────────────────── */
.lobby-body {
  background: radial-gradient(ellipse at 60% 10%, #122818 0%, #09130D 65%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding: clamp(.75rem, 3vh, 2rem) 1rem clamp(1.5rem, 5vh, 4rem);
  min-height: 100dvh;
  overflow-y: auto;
}

/* 背景花色装饰 */
.bg-suits { position: fixed; inset: 0; pointer-events: none; overflow: hidden; z-index: 0; }
.bg-suit {
  position: absolute;
  font-size: 20vw;
  opacity: .025;
  user-select: none;
  animation: floatSuit 20s ease-in-out infinite;
}
.bg-suit.s1 { top:-5%; left:-5%; animation-delay: 0s;    color: #fff; }
.bg-suit.s2 { top:10%; right:-5%; animation-delay: 5s;   color: #E84055; }
.bg-suit.s3 { bottom:5%; left:10%; animation-delay: 10s; color: #E84055; }
.bg-suit.s4 { bottom:-5%; right:5%; animation-delay:15s; color: #fff; }
@keyframes floatSuit {
  0%,100% { transform: rotate(0deg) scale(1); }
  50%      { transform: rotate(15deg) scale(1.08); }
}

/* ── 大厅容器 ───────────────────────────────── */
.lobby-wrap {
  position: relative; z-index: 1;
  width: 100%; max-width: 480px;
  display: flex; flex-direction: column; align-items: center; gap: 1.5rem;
}

/* LOGO */
.lobby-header { text-align: center; }
.logo-mark {
  font-size: clamp(1.8rem, 6vw, 2.8rem); letter-spacing: .1em;
  text-shadow: 0 0 30px rgba(212,175,55,.5);
}
.logo-suit      { color: #fff; }
.logo-suit.red  { color: var(--red); }
.logo-title {
  font-size: clamp(1.8rem, 6vw, 2.6rem); font-weight: 800;
  background: linear-gradient(135deg, var(--gold-light) 0%, var(--gold) 50%, var(--gold-dark) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  letter-spacing: .06em;
  filter: drop-shadow(0 0 20px rgba(212,175,55,.4));
}
.logo-sub { color: var(--text-muted); font-size: .9rem; margin-top: .3rem; }

/* ── 面板卡片 ───────────────────────────────── */
.lobby-main { width: 100%; }
.card-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: clamp(.85rem, 3.5vw, 1.75rem);
  box-shadow: var(--shadow-md), 0 0 0 1px rgba(255,255,255,.03) inset;
}
.panel-title {
  font-size: 1rem; font-weight: 600; color: var(--gold);
  display: flex; align-items: center; gap: .5rem;
  margin-bottom: 1.1rem;
}
.panel-title svg { width: 18px; height: 18px; }

/* ── 输入框 ─────────────────────────────────── */
.text-input {
  width: 100%;
  background: var(--surface-2);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  padding: .75rem 1rem;
  font-size: 1rem;
  transition: border-color .2s, box-shadow .2s;
  margin-bottom: 1rem;
}
.text-input:focus {
  outline: none;
  border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(212,175,55,.15);
}
.text-input::placeholder { color: var(--text-faint); }

/* ── 按钮 ───────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: .45rem;
  padding: .7rem 1.4rem;
  border-radius: var(--radius-sm);
  font-size: .9rem; font-weight: 600;
  transition: all .2s;
  cursor: pointer;
}
.btn svg { width: 16px; height: 16px; }
.btn-primary {
  background: linear-gradient(135deg, var(--gold) 0%, var(--gold-dark) 100%);
  color: #1A1100;
  box-shadow: 0 4px 15px rgba(212,175,55,.3);
}
.btn-primary:hover { filter: brightness(1.12); transform: translateY(-1px); box-shadow: 0 6px 20px rgba(212,175,55,.45); }
.btn-secondary {
  background: var(--surface-2);
  border: 1.5px solid var(--border-glow);
  color: var(--gold-light);
}
.btn-secondary:hover { background: var(--surface-3); transform: translateY(-1px); }
.btn-ghost {
  background: transparent;
  border: 1.5px solid var(--border);
  color: var(--text-muted);
}
.btn-ghost:hover { border-color: var(--gold); color: var(--gold-light); }
.btn-danger {
  background: rgba(232,64,85,.15);
  border: 1.5px solid rgba(232,64,85,.4);
  color: var(--red-soft);
}
.btn-danger:hover { background: rgba(232,64,85,.25); }
.btn-success {
  background: rgba(46,204,113,.15);
  border: 1.5px solid rgba(46,204,113,.4);
  color: var(--green);
}
.btn-success:hover { background: rgba(46,204,113,.25); }

.btn-row { display: flex; gap: .75rem; }
.btn-icon {
  background: transparent; border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  padding: .35rem; color: var(--text-muted);
  transition: color .2s;
}
.btn-icon:hover { color: var(--gold-light); }
.btn-icon svg { width: 16px; height: 16px; display: block; }

/* ── 房间码 ─────────────────────────────────── */
.room-id-row {
  display: flex; align-items: center; gap: .75rem;
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: .6rem 1rem;
  margin-bottom: 1.2rem;
}
.room-label { font-size: .75rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: .08em; }
.room-code {
  font-size: 1.6rem; font-weight: 800; letter-spacing: .35em;
  color: var(--gold-light);
  text-shadow: 0 0 20px rgba(212,175,55,.4);
  flex: 1;
}

/* ── 座位选择 ───────────────────────────────── */
.seat-table {
  display: flex; flex-direction: column; align-items: center; gap: .5rem;
  margin: 0 0 1rem;
  /* 小窗口整体缩放 */
  transform-origin: center top;
}
.seat-col     { display: flex; justify-content: center; }
.seat-row-mid { display: flex; align-items: center; gap: clamp(3px, 1vw, 8px); }
.table-center {
  width: clamp(44px, 9.5vw, 86px); height: clamp(44px, 9.5vw, 86px);
  background: radial-gradient(circle, var(--felt-2), var(--felt));
  border-radius: 50%;
  border: 2px solid var(--border-glow);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.table-felt-mini {
  font-size: clamp(.7rem, 1.8vw, 1.3rem); line-height: 1.5;
  text-align: center; color: rgba(255,255,255,.4);
}
.table-felt-mini .red { color: rgba(232,64,85,.5); }

.seat-slot {
  position: relative;
  width: clamp(54px, 11.5vw, 100px); text-align: center;
  background: var(--surface-2);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: clamp(.28rem, .8vw, .65rem) clamp(.15rem, .6vw, .4rem);
  cursor: pointer;
  transition: border-color .2s, background .2s, transform .15s;
}
.seat-slot:hover { border-color: var(--gold); transform: scale(1.03); }
.seat-slot.occupied { border-color: rgba(46,204,113,.4); background: rgba(46,204,113,.07); cursor: default; }
.seat-slot.mine { border-color: var(--gold); background: rgba(212,175,55,.08); }
.seat-leave {
  display: none; position: absolute; top: -7px; right: -7px; z-index: 3;
  width: 19px; height: 19px; padding: 0; border-radius: 50%;
  border: 1px solid rgba(224,92,92,.85); background: #4b1d22; color: #fecaca;
  font-size: 16px; line-height: 15px; cursor: pointer;
}
.seat-slot.mine .seat-leave { display: block; }
.seat-leave:hover { background: #7f1d1d; color: #fff; transform: scale(1.08); }
.seat-kick {
  display: none; position: absolute; top: -7px; left: -7px; z-index: 3;
  width: 19px; height: 19px; padding: 0; border-radius: 50%;
  border: 1px solid rgba(224,92,92,.85); background: #4b1d22; color: #fecaca;
  font-size: 13px; line-height: 15px; cursor: pointer;
}
.seat-kick:hover { background: #7f1d1d; color: #fff; transform: scale(1.08); }
.seat-slot.ready-done .seat-ready::after { content: '✓'; color: var(--green); font-size: .8rem; }

.seat-icon svg { width: clamp(14px, 2.2vw, 22px); height: clamp(14px, 2.2vw, 22px); color: var(--text-muted); }
.seat-pos  { font-size: clamp(.58rem, .9vw, .7rem); color: var(--text-muted); margin: .1rem 0; }
.seat-name { font-size: clamp(.68rem, 1.1vw, .85rem); font-weight: 600; color: var(--text); word-break: break-all; }
.seat-ready { font-size: clamp(.6rem, 1.5vw, .7rem); min-height: 1rem; }

/* 小窗口：座位区域整体缩放（用 zoom 真正影响布局尺寸） */
@media (max-width: 900px) {
  .lobby-header { margin-bottom: -.2rem; }
  .logo-mark { font-size: 1.6rem; }
  .logo-title { font-size: 1.6rem; }
  .logo-sub { font-size: .78rem; }
  .card-panel { padding: .7rem .85rem; }
  .room-id-row { margin-bottom: .8rem; padding: .45rem .75rem; }
  .room-code { font-size: 1.35rem; }
  .seat-table { zoom: 0.85; }
  .mode-grid { zoom: 0.9; }
  .hint-text { font-size: .72rem; }
}
@media (max-width: 640px) {
  .logo-mark { font-size: 1.3rem; }
  .logo-title { font-size: 1.25rem; }
  .card-panel { padding: .55rem .7rem; }
  .room-id-row { margin-bottom: .6rem; }
  .seat-table { zoom: 0.72; }
  .mode-grid { zoom: 0.78; }
}
@media (max-width: 480px) {
  .seat-table { zoom: 0.62; }
  .mode-grid { zoom: 0.65; }
}
@media (max-width: 360px) {
  .mode-grid { zoom: 0.55; }
}

/* 小窗口高度响应式：防止垂直截断 */
@media (max-height: 600px) {
  .lobby-wrap { gap: .7rem; }
  .logo-mark { font-size: 1.2rem; }
  .logo-title { font-size: 1.15rem; }
  .logo-sub { display: none; }
  .card-panel { padding: .5rem .75rem; }
  .room-id-row { margin-bottom: .5rem; padding: .3rem .6rem; }
  .seat-table { zoom: 0.80; margin-bottom: .1rem; }
  .mode-grid { zoom: 0.82; }
  .hint-text { margin-bottom: .2rem; }
}
@media (max-height: 480px) {
  .lobby-body { padding-top: .3rem; padding-bottom: .3rem; }
  .logo-sub { display: none; }
  .seat-table { zoom: 0.68; }
  .hint-text { display: none; }
}

/* ── Toast 提示 ─────────────────────────────── */
.toast {
  position: fixed; bottom: 2rem; left: 50%; transform: translateX(-50%);
  background: var(--surface-3);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-sm);
  padding: .7rem 1.4rem;
  color: var(--text); font-size: .9rem;
  box-shadow: var(--shadow-md);
  z-index: 9999;
  animation: toastIn .3s ease;
}
@keyframes toastIn { from { opacity:0; transform: translateX(-50%) translateY(10px); } to { opacity:1; transform: translateX(-50%) translateY(0); } }

/* ── Hint / Footer ──────────────────────────── */
.hint-text    { font-size: .8rem; color: var(--text-muted); text-align: center; margin-bottom: .8rem; }
.hint-center  { font-size: .9rem; color: var(--text-muted); text-align: center; padding: 1rem; }
.lobby-footer { font-size: .75rem; color: var(--text-faint); text-align: center; }

/* ── 弹窗 ───────────────────────────────────── */
.modal-overlay {
  position: fixed; inset: 0; z-index: 1000;
  background: rgba(0,0,0,.75);
  display: flex; align-items: center; justify-content: center;
  backdrop-filter: blur(4px);
  animation: fadeIn .2s ease;
}
@keyframes fadeIn { from{opacity:0} to{opacity:1} }

.modal {
  background: var(--surface);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius);
  padding: 1.75rem;
  width: min(92vw, 480px);
  box-shadow: var(--shadow-lg);
  animation: slideUp .25s ease;
}
.modal-sm   { width: min(92vw, 360px); }
.modal-wide { width: min(96vw, 680px); }

@keyframes slideUp { from{transform:translateY(24px);opacity:0} to{transform:translateY(0);opacity:1} }

.modal-title {
  font-size: 1.1rem; font-weight: 700; color: var(--gold-light);
  display: flex; align-items: center; gap: .5rem; margin-bottom: 1rem;
}
.modal-title svg { width: 20px; height: 20px; }
.modal-desc   { color: var(--text-muted); font-size: .9rem; margin-bottom: .75rem; }
.modal-label  { display: block; font-size: .8rem; color: var(--text-muted); margin-bottom: .35rem; }
.modal-textarea {
  width: 100%; background: var(--surface-2);
  border: 1.5px solid var(--border); border-radius: var(--radius-sm);
  color: var(--text); padding: .6rem .85rem; font-size: .9rem; resize: none;
  margin-bottom: 1rem;
}
.modal-textarea:focus { outline: none; border-color: var(--gold); }
.modal-btn-row { display: flex; gap: .75rem; justify-content: flex-end; }

/* ── 扑克牌样式 ─────────────────────────────── */
.card {
  display: inline-flex; flex-direction: column; justify-content: space-between;
  position: relative; z-index: 1;
  width: var(--card-w); height: var(--card-h);
  background: #fff;
  border-radius: clamp(4px, 0.5vw, 7px);
  border: 1px solid #ddd;
  padding: clamp(2px, 0.3vw, 4px) clamp(2px, 0.4vw, 5px);
  box-shadow: 0 2px 8px rgba(0,0,0,.45);
  cursor: pointer;
  transition: transform .15s, box-shadow .15s;
  user-select: none;
  position: relative;
  flex-shrink: 0;
}
.card:hover { transform: translateY(-8px); box-shadow: 0 10px 24px rgba(0,0,0,.55); z-index: 50; }
.card:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
  transform: translateY(-6px);
  box-shadow: 0 0 0 3px rgba(212,175,55,.35), 0 8px 20px rgba(0,0,0,.5);
}
.card.disabled { cursor: default; } /* 废除半透明机制 */
.card.disabled:hover { transform: none; box-shadow: 0 2px 8px rgba(0,0,0,.45); }
.card.card-inert { cursor: default; }
.card.card-inert:hover { transform: none; box-shadow: 0 2px 8px rgba(0,0,0,.45); }
.card.dummy-inactive { cursor: default; opacity: 1; }
.card.dummy-inactive:hover { transform: none; box-shadow: 0 2px 8px rgba(0,0,0,.45); }
.card.selected { transform: translateY(-12px); box-shadow: 0 0 0 2px var(--gold), 0 12px 28px rgba(212,175,55,.5); }
.card.played { opacity: .65; pointer-events: none; }

.card-tl, .card-br {
  display: flex; flex-direction: column; align-items: flex-start;
  line-height: 1;
}
.card-br { transform: rotate(180deg); }
.card-rank  { font-size: calc(var(--card-w) * 0.28); font-weight: 800; line-height: 1; }
.card-suit-sm { font-size: calc(var(--card-w) * 0.23); line-height: 1; }
.card-suit-center { font-size: calc(var(--card-w) * 0.48); text-align: center; position: absolute; top:50%; left:50%; transform:translate(-50%,-50%); }

.card.red  { color: var(--red); }
.card.black { color: #1A1A2E; }

/* 背面：暗绿底 + 极细金色菱格 */
.card-back {
  background:
    repeating-linear-gradient(
      45deg,
      rgba(201,168,76,.07) 0px, rgba(201,168,76,.07) 1px,
      transparent 1px, transparent 9px
    ),
    repeating-linear-gradient(
      -45deg,
      rgba(201,168,76,.07) 0px, rgba(201,168,76,.07) 1px,
      transparent 1px, transparent 9px
    ),
    #102A1E;
  border: 2px solid rgba(201,168,76,.22);
  cursor: default;
}
.card-back:hover { transform: none; }

/* ── 声称手牌展示 ────────────────────────────── */
.claim-hands-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: .4rem; margin: .4rem 0;
}
.claim-hand-block { background: var(--surface-2); border-radius: var(--radius-sm); padding: .35rem; }
.claim-hand-label { font-size: .75rem; color: var(--text-muted); margin-bottom: .4rem; }
.claim-hand-cards { display: flex; flex-wrap: wrap; gap: 3px; }
.claim-hand-cards .card { transform: scale(.75); transform-origin: top left; margin-bottom: -20px; }

/* 声称接收弹窗：高度约束，防止溢出屏幕 */
#modal-claim-recv .modal {
  max-height: 85vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

/* 上一墩展示：采用 3x3 十字网格 */
.trick-display-grid {
  display: grid; grid-template-columns: 1fr 1fr 1fr; grid-template-rows: auto auto auto;
  gap: .5rem; margin: .75rem 0;
}
.trick-card-slot { display: flex; flex-direction: column; align-items: center; gap: .3rem; }
.trick-seat-label { font-size: .75rem; color: var(--text-muted); }
.trick-winner-mark { font-size: .75rem; color: var(--green); font-weight: 600; }

/* 声称墩数选择 */
.claim-tricks-row { display: flex; gap: .4rem; flex-wrap: wrap; margin-bottom: .75rem; }
.claim-trick-btn {
  width: 40px; height: 40px;
  border-radius: var(--radius-xs);
  background: var(--surface-2);
  border: 1.5px solid var(--border);
  color: var(--text);
  font-size: .95rem; font-weight: 700;
  transition: all .15s;
}
.claim-trick-btn:hover        { border-color: var(--gold); color: var(--gold-light); }
.claim-trick-btn:focus-visible { outline: 2px solid var(--gold); outline-offset: 2px; border-color: var(--gold); }
.claim-trick-btn.selected      { background: var(--gold); color: #1A1100; border-color: var(--gold); }

/* 就绪状态指示 */
.ready-indicator { font-size: .8rem; color: var(--text-muted); margin-top: .5rem; }

/* ── 模式选择 ────────────────────────────────────────────────── */
.mode-select-row {
  display: flex;
  gap: .8rem;
  justify-content: center;
  margin-bottom: 1rem;
}
.mode-btn {
  flex: 1;
  max-width: 160px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .3rem;
  padding: 1rem .6rem;
  background: var(--surface-2, rgba(255,255,255,.04));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  cursor: pointer;
  transition: border-color .15s, transform .12s;
}
.mode-btn:hover { border-color: var(--gold); transform: translateY(-2px); }
.mode-btn-ult   { border-color: #c084fc44; }
.mode-btn-ult:hover { border-color: #c084fc; }
.mode-icon  { font-size: 1.8rem; }
.mode-name  { font-weight: 700; font-size: .9rem; }
.mode-desc  { font-size: .72rem; color: var(--text-muted); text-align: center; }

/* ── 角色选择 ────────────────────────────────────────────────── */
.char-select-title {
  font-size: .8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-align: center;
  margin-bottom: .4rem;
}
.char-grid {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  justify-content: center;
  margin-bottom: .3rem;
}
.char-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .15rem;
  padding: .35rem .6rem;
  background: var(--surface-2, rgba(255,255,255,.04));
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  cursor: pointer;
  font-size: .78rem;
  transition: border-color .12s;
  min-width: 70px;
}
.char-btn:hover  { border-color: #c084fc; }
.char-btn.selected { border-color: #c084fc; background: rgba(192,132,252,.12); }
.char-name { font-weight: 700; font-size: .82rem; }
.char-desc { font-size: .68rem; color: var(--text-muted); text-align: center; }
.char-chosen-label {
  font-size: .72rem;
  color: #c084fc;
  text-align: center;
  min-height: 1em;
}

/* ── 模式格 (四格) ────────────────────────────────────────────── */
.mode-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .6rem;
  margin-top: .8rem;
}
.mode-tile {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: .7rem .6rem .6rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .2rem;
  transition: border-color .15s;
  background: var(--surface-2, rgba(255,255,255,.03));
}
.mode-tile:hover:not(.disabled) { border-color: var(--gold); }
.mode-tile-ult   { border-color: #c084fc44; }
.mode-tile-ult:hover { border-color: #c084fc !important; }
.mode-tile-complex { position:relative; overflow:visible; border-color: #60a5fa66; }
.mode-tile-complex:hover { border-color: #60a5fa !important; }
.complex-info { position:absolute; top:.35rem; right:.4rem; z-index:20; }
.complex-info summary { list-style:none; cursor:pointer; width:1.25rem; height:1.25rem; display:grid; place-items:center; border-radius:50%; border:1px solid rgba(147,197,253,.65); color:#bfdbfe; font-size:.86rem; background:rgba(15,36,58,.84); }
.complex-info summary::-webkit-details-marker { display:none; }
.complex-info[open] summary { color:#fff; border-color:#93c5fd; background:#1d4ed8; }
.complex-info-panel { position:absolute; top:1.55rem; right:0; width:min(360px,78vw); padding:.8rem .9rem; border-radius:8px; border:1px solid rgba(147,197,253,.6); background:#0b1d2c; color:var(--text); text-align:left; box-shadow:var(--shadow-lg); font-size:.72rem; line-height:1.45; }
.complex-info-panel strong { color:#bfdbfe; font-size:.78rem; }.complex-info-panel p { margin:.38rem 0; color:var(--text-muted); }.complex-info-panel b { color:var(--text); }
.mode-tile-teach { border-color: #34d39944; }
.mode-tile-teach:hover { border-color: #34d399 !important; }
.mode-tile.disabled { opacity: .45; pointer-events: none; }
.mode-tile-icon  { font-size: 1.5rem; }
.mode-tile-name  { font-weight: 700; font-size: .85rem; color: var(--text); }
.mode-tile-desc  { font-size: .68rem; color: var(--text-muted); text-align: center; margin-bottom: .25rem; }
.mode-tile-btns  { display: flex; gap: .4rem; }
.btn-sm { font-size: .75rem; padding: .3rem .6rem; }

/* ── 房间模式标签 ────────────────────────────────────────────── */
.room-mode-tag {
  display: inline-block;
  font-size: .65rem;
  font-weight: 700;
  padding: .1em .45em;
  border-radius: 3px;
  background: rgba(255,255,255,.12);
  color: var(--text-muted);
  margin-left: .4em;
  vertical-align: middle;
  letter-spacing: .03em;
}
.mode-tag-ult   { background: rgba(192,132,252,.25); color: #c084fc; }
.mode-tag-complex { background: rgba(96,165,250,.2); color: #93c5fd; }
.mode-tag-teach { background: rgba(52,211,153,.25);  color: #34d399; }
.mode-tag-quiz  { background: rgba(240,192,64,.2);   color: #f0c040; }

/* ── 教学模式提示 ─────────────────────────────────────────────── */
.teaching-hint {
  font-size: .75rem;
  color: #34d399;
  background: rgba(52,211,153,.08);
  border: 1px solid rgba(52,211,153,.25);
  border-radius: 6px;
  padding: .4rem .6rem;
  margin: .3rem 0;
  text-align: center;
}