:root {
  --bg: #0f172a;
  --card: #111827;
  --card-2: #1f2937;
  --text: #e5e7eb;
  --line: #374151;
  --brand: #22c55e;
  --warn: #f59e0b;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Source Han Sans SC", "Noto Sans SC", sans-serif;
  background: radial-gradient(circle at 20% 0%, #1e293b 0%, #0b1020 55%, #04070f 100%);
  color: var(--text);
}

.duel-page {
  max-width: 1160px;
  margin: 0 auto;
  padding: 20px 14px 28px;
}

.duel-header h1 {
  margin: 0;
}

.duel-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.home-link {
  border: 1px solid rgba(56, 189, 248, 0.45);
  background: rgba(7, 89, 133, 0.36);
  color: #dbeafe;
  text-decoration: none;
  border-radius: 999px;
  padding: 7px 12px;
  font-size: 13px;
  white-space: nowrap;
}

.home-link:hover {
  border-color: rgba(125, 211, 252, 0.75);
  background: rgba(14, 116, 144, 0.48);
}

.duel-header p {
  margin-top: 8px;
  color: #cbd5e1;
}

.duel-layout {
  margin-top: 16px;
  display: grid;
  grid-template-columns: 1.45fr 1fr;
  gap: 14px;
}

.panel {
  background: linear-gradient(165deg, rgba(31, 41, 55, 0.95), rgba(17, 24, 39, 0.96));
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
}

.board-mount {
  margin-top: 10px;
  min-height: 580px;
  display: grid;
  place-items: center;
  background: rgba(2, 6, 23, 0.3);
  border-radius: 10px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.mobile-place-assist {
  display: none;
  margin-top: 10px;
  padding: 10px;
  border: 1px solid rgba(56, 189, 248, 0.35);
  border-radius: 10px;
  background: rgba(7, 89, 133, 0.16);
}

/* 预落子幽灵棋子在移动端要足够显眼 */
.arena-goban .shudan-vertex .shudan-ghost {
  opacity: 0.85;
}

.mobile-place-assist p {
  margin: 0;
  color: #bfdbfe;
  font-size: 13px;
}

.mobile-place-actions {
  margin-top: 8px;
  display: flex;
  gap: 8px;
}

#btnConfirmMove {
  border-color: #15803d;
  background: rgba(21, 128, 61, 0.28);
}

button,
.back-link {
  border: 1px solid var(--line);
  background: var(--card-2);
  color: var(--text);
  border-radius: 8px;
  padding: 8px 12px;
  cursor: pointer;
  text-decoration: none;
}

button:hover,
.back-link:hover {
  border-color: #64748b;
}

#btnJoin {
  border-color: #15803d;
  background: rgba(21, 128, 61, 0.28);
}

#btnResign {
  border-color: #b91c1c;
  background: rgba(153, 27, 27, 0.25);
}

.btn-review {
  border-color: #0ea5e9;
  background: rgba(14, 165, 233, 0.2);
}
.btn-review:hover:not(:disabled) {
  background: rgba(14, 165, 233, 0.38);
}
.btn-review:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.info-list,
.queue-list {
  margin: 8px 0;
  padding-left: 18px;
}

.queue-list li {
  margin-bottom: 6px;
}

.queue-admin-actions {
  display: inline-flex;
  gap: 6px;
  margin-left: 8px;
}

.queue-admin-actions button {
  padding: 3px 8px;
  font-size: 12px;
  border-radius: 6px;
  border: 1px solid rgba(148, 163, 184, 0.45);
  background: rgba(15, 23, 42, 0.85);
}

.queue-admin-actions button:hover {
  border-color: rgba(56, 189, 248, 0.75);
}

.admin-panel {
  margin: 10px 0 12px;
  padding: 10px;
  border: 1px solid rgba(56, 189, 248, 0.35);
  border-radius: 10px;
  background: rgba(7, 89, 133, 0.14);
}

.admin-panel h3 {
  margin: 0;
}

.admin-tip {
  margin: 6px 0 8px;
  color: #bfdbfe;
  font-size: 13px;
}

.admin-kick-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
}

#adminTargetUserId {
  border: 1px solid var(--line);
  background: rgba(17, 24, 39, 0.95);
  color: var(--text);
  border-radius: 8px;
  padding: 8px 10px;
  outline: none;
}

#adminTargetUserId:focus {
  border-color: #38bdf8;
}

#btnAdminKick {
  border-color: #dc2626;
  background: rgba(220, 38, 38, 0.22);
}

.chat-panel {
  border: 1px solid rgba(148, 163, 184, 0.24);
  border-radius: 10px;
  background: rgba(2, 6, 23, 0.36);
  padding: 8px;
}

.chat-list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-height: 220px;
  overflow-y: auto;
}

.chat-list li {
  padding: 6px 8px;
  border-radius: 8px;
  margin-bottom: 6px;
  background: rgba(15, 23, 42, 0.72);
  border: 1px solid rgba(148, 163, 184, 0.15);
  line-height: 1.35;
  font-size: 13px;
}

.chat-list .chat-meta {
  color: #93c5fd;
  font-size: 12px;
  margin-bottom: 2px;
}

.chat-list .chat-empty {
  text-align: center;
  color: #94a3b8;
  background: transparent;
  border: 1px dashed rgba(148, 163, 184, 0.25);
}

.chat-actions {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
  margin-top: 8px;
}

#chatInput {
  border: 1px solid var(--line);
  background: rgba(17, 24, 39, 0.95);
  color: var(--text);
  border-radius: 8px;
  padding: 8px 10px;
  outline: none;
}

#chatInput:focus {
  border-color: #38bdf8;
}

#btnChatSend {
  border-color: #0284c7;
  background: rgba(2, 132, 199, 0.22);
}

#statusText {
  color: #cbd5e1;
  margin: 8px 0 0;
}

#lastResultText {
  margin-top: 6px;
  color: #fde68a;
}

@media (max-width: 900px) {
  .duel-header-row {
    flex-direction: column;
    align-items: flex-start;
  }

  .duel-layout {
    grid-template-columns: 1fr;
  }

  .board-mount {
    min-height: 420px;
  }

  .mobile-place-assist {
    display: block;
  }
}