/* ============ 基础与设计令牌 ============ */
:root {
  --bg: #0b0b0d;
  --bg-2: #101014;
  --panel: #15151a;
  --panel-2: #1b1b21;
  --line: #26262e;
  --line-2: #34343f;
  --text: #ececf2;
  --muted: #8a8a97;
  --accent: #ffd21f;
  --p1: #3aa0ff;
  --p2: #ff2e63;
  --p3: #ffa62b;
  --p4: #2ee36b;
  --danger: #ff5470;
  --radius: 14px;
  --radius-s: 10px;
  --shadow: 0 10px 40px rgba(0, 0, 0, .5);
  --glow: 0 0 24px rgba(255, 210, 31, .18);
  --font: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --mono: ui-monospace, "Cascadia Code", "SF Mono", Consolas, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font);
  background:
    radial-gradient(1200px 700px at 70% -10%, rgba(58, 166, 255, .06), transparent 60%),
    radial-gradient(900px 600px at 10% 110%, rgba(255, 46, 99, .05), transparent 60%),
    var(--bg);
  color: var(--text);
  min-height: 100dvh;
  line-height: 1.5;
  -webkit-tap-highlight-color: transparent;
}

button, input, select { font: inherit; color: inherit; }
button { cursor: pointer; }
::selection { background: rgba(255, 210, 31, .3); }

.screen { display: none; }
.screen.active { display: block; }

/* ============ 首页 ============ */
#screen-home {
  max-width: 980px;
  margin: 0 auto;
  padding: 6vh 20px 60px;
}

.hero { text-align: center; margin-bottom: 40px; position: relative; }

.logo {
  font-size: clamp(44px, 9vw, 76px);
  font-weight: 900;
  letter-spacing: .12em;
  line-height: 1;
  color: #f4f4f8;
  text-shadow: 0 0 30px rgba(255, 210, 31, .25);
}
.logo em { font-style: normal; color: var(--accent); text-shadow: 0 0 34px rgba(255, 210, 31, .55); }

.tagline { color: var(--muted); margin-top: 14px; font-size: 15px; }
.tagline strong { color: var(--text); font-weight: 600; }

/* hero 右上角的小型棋盘装饰 */
.hero-grid {
  position: absolute;
  right: 4%;
  top: -18px;
  display: grid;
  grid-template-columns: repeat(5, 16px);
  gap: 4px;
  opacity: .85;
  pointer-events: none;
}
.hero-grid span {
  width: 16px; height: 16px;
  border-radius: 4px;
  background: #222228;
}
.hero-grid span.goal {
  background: var(--accent);
  box-shadow: 0 0 14px rgba(255, 210, 31, .7);
}

.home-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  align-items: start;
}
@media (max-width: 720px) { .home-grid { grid-template-columns: 1fr; } }

.card {
  background: linear-gradient(180deg, var(--panel-2), var(--panel));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
}
.card h2 { font-size: 15px; letter-spacing: .06em; margin-bottom: 18px; display: flex; align-items: center; gap: 8px; }
.card h3 { font-size: 14px; letter-spacing: .04em; color: var(--text); margin-bottom: 12px; }

.dot-dot {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--p1);
  box-shadow: 0 0 10px var(--p1);
  display: inline-block;
}
.dot-dot.pink { background: var(--p2); box-shadow: 0 0 10px var(--p2); }

.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; flex: 1; min-width: 0; }
.field > span { font-size: 12.5px; color: var(--muted); letter-spacing: .02em; }
.field-group { display: flex; gap: 12px; }

.input {
  background: #0e0e12;
  border: 1px solid var(--line-2);
  border-radius: var(--radius-s);
  padding: 10px 12px;
  outline: none;
  transition: border-color .15s, box-shadow .15s;
  width: 100%;
  min-width: 0;
}
.input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(255, 210, 31, .15); }
select.input { appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--muted) 50%), linear-gradient(135deg, var(--muted) 50%, transparent 50%); background-position: calc(100% - 18px) 55%, calc(100% - 13px) 55%; background-size: 5px 5px; background-repeat: no-repeat; padding-right: 32px; }
.input.code { font-family: var(--mono); font-size: 20px; letter-spacing: .35em; text-transform: uppercase; text-align: center; }

.btn {
  border: 1px solid var(--line-2);
  background: var(--panel-2);
  border-radius: var(--radius-s);
  padding: 11px 16px;
  font-size: 14.5px;
  font-weight: 600;
  transition: transform .12s, box-shadow .15s, border-color .15s, background .15s;
  width: 100%;
}
.btn:hover:not(:disabled) { border-color: var(--line-2); background: #22222a; box-shadow: 0 0 18px rgba(255, 255, 255, .06); }
.btn:active:not(:disabled) { transform: translateY(1px) scale(.99); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn.primary {
  background: linear-gradient(180deg, #ffe066, var(--accent));
  color: #201800;
  border-color: #c99f00;
  box-shadow: 0 4px 20px rgba(255, 210, 31, .22);
}
.btn.primary:hover:not(:disabled) { box-shadow: 0 6px 26px rgba(255, 210, 31, .38); }
.btn.ghost { background: transparent; }
.btn.small { width: auto; padding: 8px 14px; font-size: 13px; }
.btn.danger { color: var(--danger); border-color: rgba(255, 84, 112, .4); }

.hint { color: var(--muted); font-size: 12.5px; margin-top: 12px; }
.hint code { font-family: var(--mono); color: var(--accent); }

.rules { margin-top: 18px; grid-column: 1 / -1; }
.rules ol { padding-left: 20px; color: var(--muted); font-size: 13.5px; display: grid; gap: 6px; }
.rules b { color: var(--text); }
.rules li::marker { color: var(--accent); }

/* ============ 房间页 ============ */
#screen-room {
  display: none;
  min-height: 100dvh;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
  flex-direction: column;
}
#screen-room.active { display: flex; }

.topbar {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 18px;
  border-bottom: 1px solid var(--line);
  background: rgba(11, 11, 13, .8);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 20;
}
.brand { font-weight: 900; letter-spacing: .1em; font-size: 17px; white-space: nowrap; }
.brand em { font-style: normal; color: var(--accent); }

.room-code {
  display: flex; align-items: center; gap: 8px;
  background: #101015;
  border: 1px solid var(--line-2);
  border-radius: 10px;
  padding: 6px 12px;
  /* 点击即复制邀请码，触摸目标给足 40px */
  min-height: 40px;
  color: var(--text);
  transition: box-shadow .15s;
}
.room-code:hover { box-shadow: 0 0 16px rgba(255, 210, 31, .25); }
.rc-label { font-size: 11px; color: var(--muted); }
.room-code strong { font-family: var(--mono); font-size: 17px; letter-spacing: .22em; color: var(--accent); }
.rc-copy { color: var(--muted); }

.topbar-right { margin-left: auto; display: flex; align-items: center; gap: 12px; }
.conn-state { font-size: 12px; color: var(--muted); display: flex; align-items: center; gap: 6px; white-space: nowrap; }
.conn-state .dot { width: 8px; height: 8px; border-radius: 50%; background: #2ee36b; box-shadow: 0 0 8px #2ee36b; }
.conn-state.off .dot { background: var(--danger); box-shadow: 0 0 8px var(--danger); }
.conn-state.off { color: var(--danger); }

.room-main {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 330px;
  gap: 20px;
  padding: 18px;
  align-items: start;
  max-width: 1280px;
  width: 100%;
  margin: 0 auto;
}

/* ============ 棋盘区 ============ */
.board-zone { display: flex; flex-direction: column; gap: 12px; min-width: 0; }

.board-wrap {
  position: relative;
  width: 100%;
  max-width: min(100%, calc(100dvh - 200px));
  aspect-ratio: 1;
  margin: 0 auto;
}
canvas#board {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: 18px;
  touch-action: manipulation;
}

.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(8, 8, 10, .66);
  backdrop-filter: blur(6px);
  border-radius: 18px;
  z-index: 5;
  animation: fadeIn .25s ease;
}
.overlay.hidden { display: none; }
@keyframes fadeIn { from { opacity: 0; } }

/* 通用隐藏开关：app.js 用 classList.toggle('hidden') 控制按钮/表单/提示的显隐，
   所以必须有一条全局规则（只写 .overlay.hidden 会让其它元素的 hidden 完全不生效）。 */
.hidden { display: none !important; }

.overlay-card {
  text-align: center;
  padding: 30px;
  max-width: 86%;
}
.overlay-card h3 { font-size: 22px; margin-bottom: 8px; }
.overlay-card p { color: var(--muted); font-size: 14px; }
.overlay-card p strong { color: var(--accent); font-family: var(--mono); letter-spacing: .2em; }

.pulse-ring {
  width: 54px; height: 54px;
  margin: 0 auto 18px;
  border-radius: 50%;
  border: 2px solid var(--accent);
  box-shadow: 0 0 24px rgba(255, 210, 31, .5);
  animation: pulse 1.8s ease-out infinite;
}
@keyframes pulse {
  0% { transform: scale(.7); opacity: 1; }
  100% { transform: scale(1.5); opacity: 0; }
}

.seats-preview { display: flex; justify-content: center; gap: 10px; margin-top: 20px; flex-wrap: wrap; }
.seat-chip {
  width: 30px; height: 30px; border-radius: 50%;
  border: 2px solid var(--line-2);
  background: #0e0e12;
  display: flex; align-items: center; justify-content: center;
  font-size: 11px; color: var(--muted);
}
.seat-chip.taken { border-color: currentColor; box-shadow: 0 0 12px currentColor; color: #fff; }

.overlay-card.win .crown { font-size: 44px; color: var(--accent); text-shadow: 0 0 30px rgba(255, 210, 31, .8); margin-bottom: 10px; }
.overlay-card.win h3 { font-size: 26px; text-shadow: 0 0 24px currentColor; }
.overlay-actions { margin-top: 22px; display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.overlay-actions .btn { width: auto; }

/* ============ 操作条 ============ */
.actionbar {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  max-width: min(100%, calc(100dvh - 200px));
  margin: 0 auto;
  width: 100%;
}

.turn-indicator {
  flex: 1;
  min-width: 180px;
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  padding: 9px 14px;
  font-size: 14px;
}
.ti-dot {
  width: 11px; height: 11px; border-radius: 50%;
  background: var(--muted);
  flex: none;
}
.ti-timer { margin-left: auto; font-family: var(--mono); color: var(--accent); font-size: 15px; }
.ti-timer.warn { color: var(--danger); animation: blink 1s steps(2) infinite; }
@keyframes blink { 50% { opacity: .35; } }

.mode-switch { display: flex; gap: 8px; }
.mode-btn {
  display: flex; align-items: center; gap: 7px;
  background: var(--panel);
  border: 1px solid var(--line-2);
  border-radius: var(--radius-s);
  color: var(--muted);
  padding: 9px 14px;
  font-size: 14px;
  font-weight: 600;
  transition: all .15s;
}
.mode-btn.active {
  color: var(--text);
  border-color: var(--accent);
  box-shadow: inset 0 0 20px rgba(255, 210, 31, .08), 0 0 14px rgba(255, 210, 31, .15);
}
.mode-btn:disabled { opacity: .4; cursor: not-allowed; }
.badge {
  background: #0e0e12;
  border: 1px solid var(--line-2);
  border-radius: 20px;
  font-size: 11.5px;
  font-family: var(--mono);
  padding: 1px 8px;
  color: var(--accent);
}

/* ============ 侧栏 ============ */
.side { display: flex; flex-direction: column; gap: 14px; min-width: 0; }

.panel {
  background: linear-gradient(180deg, var(--panel-2), var(--panel));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
}
.panel h3 {
  font-size: 13px;
  color: var(--muted);
  letter-spacing: .08em;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.head-extra { font-size: 12px; color: var(--muted); letter-spacing: 0; font-weight: 400; }

.player-list { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.player-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 10px;
  background: #0f0f14;
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  transition: border-color .2s, box-shadow .2s;
  position: relative;
}
.player-item.me::after {
  content: "我";
  position: absolute;
  right: 10px; top: -6px;
  font-size: 9px;
  background: var(--line-2);
  color: var(--text);
  padding: 1px 6px;
  border-radius: 6px;
  letter-spacing: .1em;
}
.player-item.turn { border-color: currentColor; box-shadow: 0 0 16px -4px currentColor; }
.player-item.off { opacity: .55; }
.player-item.spectator { opacity: .8; border-style: dashed; }

.pp-color {
  width: 26px; height: 26px;
  border-radius: 50%;
  flex: none;
  position: relative;
}
.pp-color::after { content: ""; position: absolute; inset: 0; border-radius: 50%; border: 2px solid currentColor; }
.pp-name { font-weight: 600; font-size: 14px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--text); }
.pp-meta { margin-left: auto; display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 12px; white-space: nowrap; }
.pp-crown { color: var(--accent); filter: drop-shadow(0 0 6px rgba(255, 210, 31, .6)); }
.pp-walls { font-family: var(--mono); }
.pp-kick {
  border: none; background: none; color: var(--muted);
  font-size: 11px; padding: 2px 6px; border-radius: 6px;
}
.pp-kick:hover { color: var(--danger); background: rgba(255, 84, 112, .12); }

.settings-view { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 14px; font-size: 13px; }
.settings-view .sv-item { color: var(--muted); }
.settings-view .sv-item b { color: var(--text); font-weight: 600; margin-left: 6px; float: right; }
#settings-form .field-group { gap: 10px; }
#btn-apply-settings { margin-top: 4px; }

.host-actions { display: flex; gap: 10px; }
.host-actions .btn { flex: 1; white-space: nowrap; }

.log-list { list-style: none; display: flex; flex-direction: column; gap: 6px; max-height: 180px; overflow-y: auto; }
.log-list li { font-size: 12.5px; color: var(--muted); padding-left: 10px; position: relative; }
.log-list li::before { content: ""; position: absolute; left: 0; top: 8px; width: 4px; height: 4px; border-radius: 50%; background: var(--line-2); }
.log-list li:last-child { color: var(--text); }

/* ============ 提示条 ============ */
.toast {
  position: fixed;
  left: 50%;
  bottom: max(24px, env(safe-area-inset-bottom));
  transform: translateX(-50%) translateY(20px);
  background: #1d1d24;
  border: 1px solid var(--line-2);
  border-radius: 10px;
  padding: 10px 20px;
  font-size: 14px;
  box-shadow: var(--shadow);
  opacity: 0;
  pointer-events: none;
  transition: all .25s;
  z-index: 100;
  max-width: min(90vw, 420px);
  text-align: center;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.err { border-color: rgba(255, 84, 112, .5); color: #ffb3c0; }

/* ============ 响应式：手机竖屏 ============ */
@media (max-width: 900px) {
  .room-main { grid-template-columns: 1fr; padding: 12px; gap: 14px; }
  .side { order: 2; }
  .board-wrap, .actionbar { max-width: 100%; }

  .topbar { padding: 10px 12px; gap: 10px; }
  .brand { font-size: 14px; }
  .room-code strong { font-size: 15px; letter-spacing: .16em; }
  .conn-state { display: none; }

  .field-group { flex-direction: column; gap: 0; }
  .card { padding: 18px; }
  .settings-view { grid-template-columns: 1fr 1fr; }
  .log-panel { display: none; } /* 手机上收纳动态，避免过长 */
}

@media (max-width: 900px) and (max-height: 900px) {
  /* 矮屏（横屏手机 / 小窗口）：限制棋盘高度留出操作空间 */
  .board-wrap { max-width: min(100%, calc(100dvh - 300px)); min-width: 260px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

/* 触屏时给更大的点击目标 */
@media (pointer: coarse) {
  .mode-btn, .btn, .input { min-height: 44px; }
  .mode-btn { padding: 10px 16px; }
}