/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }

:root {
  /* 背景渐变色 */
  --bg-from:  #dde8f5;
  --bg-mid:   #e8dff5;
  --bg-to:    #f5e8d8;

  /* 气泡色 */
  --orb-1: rgba(160, 190, 255, 0.55);
  --orb-2: rgba(200, 160, 255, 0.45);
  --orb-3: rgba(255, 200, 150, 0.45);

  /* Apple 色彩体系 */
  --blue:      #0071e3;
  --blue-light: rgba(0, 113, 227, 0.12);
  --blue-mid:   rgba(0, 113, 227, 0.22);

  /* 文字 */
  --text-primary:   #1d1d1f;
  --text-secondary: #6e6e73;
  --text-tertiary:  #aeaeb2;

  /* 毛玻璃卡片 */
  --card-bg:      rgba(255, 255, 255, 0.62);
  --card-border:  rgba(255, 255, 255, 0.85);
  --card-shadow:  0 8px 40px rgba(0, 0, 0, 0.12), 0 2px 8px rgba(0, 0, 0, 0.06);

  /* 按钮 */
  --btn-ghost-bg:     rgba(255, 255, 255, 0.5);
  --btn-ghost-border: rgba(0, 0, 0, 0.1);
  --btn-ghost-hover:  rgba(255, 255, 255, 0.75);

  --radius-xl: 22px;
  --radius-lg: 14px;
  --radius-md: 10px;
}

/* ── 背景 ── */
html, body {
  height: 100%;
  font-family: -apple-system, 'SF Pro Display', 'SF Pro Text', 'PingFang SC', 'Helvetica Neue', sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  overscroll-behavior: none;
  background: linear-gradient(145deg, var(--bg-from) 0%, var(--bg-mid) 50%, var(--bg-to) 100%);
  color: var(--text-primary);
}

/* 动态光晕气泡 */
.bg-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
  animation: float 12s ease-in-out infinite alternate;
  will-change: transform;
}
.orb-1 {
  width: 480px; height: 480px;
  top: -120px; left: -100px;
  background: var(--orb-1);
  animation-duration: 14s;
}
.orb-2 {
  width: 400px; height: 400px;
  top: 30%; right: -120px;
  background: var(--orb-2);
  animation-duration: 10s;
  animation-delay: -4s;
}
.orb-3 {
  width: 360px; height: 360px;
  bottom: -80px; left: 25%;
  background: var(--orb-3);
  animation-duration: 16s;
  animation-delay: -8s;
}
@keyframes float {
  from { transform: translate(0, 0) scale(1);   }
  to   { transform: translate(30px, 20px) scale(1.08); }
}

/* ── 布局 ── */
.game-wrapper {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
  min-height: 100dvh;
  padding: max(44px, env(safe-area-inset-top, 44px))
           max(20px, env(safe-area-inset-right, 20px))
           max(48px, env(safe-area-inset-bottom, 48px))
           max(20px, env(safe-area-inset-left, 20px));
  gap: 0;
}

/* ── 标题 ── */
.game-header {
  text-align: center;
  margin-bottom: 30px;
}

.eyebrow {
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 8px;
}

#title {
  font-size: clamp(2rem, 5vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  line-height: 1.05;
  transition: color 0.4s ease;
}

#title.win  {
  background: linear-gradient(135deg, #34c759, #30d158);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
#title.lose {
  background: linear-gradient(135deg, #ff3b30, #ff453a);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
#title.draw {
  color: var(--text-secondary);
}

.subtitle {
  margin-top: 8px;
  font-size: 0.82rem;
  font-weight: 400;
  color: var(--text-secondary);
  letter-spacing: 0.01em;
  min-height: 1.4em;
  transition: color 0.3s;
}

.shortcuts-hint {
  margin-top: 10px;
  font-size: 0.72rem;
  color: var(--text-tertiary);
  letter-spacing: 0.02em;
  opacity: 0.7;
}

/* 桌面端显示快捷键，移动端隐藏 */
@media (max-width: 768px) {
  .shortcuts-hint {
    display: none;
  }
}

/* ══════════════════════════════════════
   模式切换（点击标题区）
   ══════════════════════════════════════ */
.mode-toggle {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  margin: -6px -12px 0;          /* 抵消内边距，保持视觉居中不变 */
  border: none;
  background: transparent;
  border-radius: var(--radius-lg);
  cursor: pointer;
  font-family: inherit;
  outline: none;
  transition: background 0.18s ease;
  -webkit-tap-highlight-color: transparent;
}
.mode-toggle:hover {
  background: rgba(255, 255, 255, 0.42);
}
.mode-toggle:active {
  transform: scale(0.985);
}
.mode-toggle:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
}

/* 模式徽章：提示「点击可切换」 */
.mode-badge {
  font-size: 0.64rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--blue);
  background: var(--blue-light);
  border: 1px solid rgba(0, 113, 227, 0.18);
  border-radius: 999px;
  padding: 2px 10px;
  white-space: nowrap;
  transition: opacity 0.2s, transform 0.2s;
}
.mode-toggle:hover .mode-badge {
  opacity: 0.86;
}

/* ══════════════════════════════════════
   功能开关（音效 / 提示）
   ══════════════════════════════════════ */
.toggles {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 12px;
  max-width: 720px;
  width: 100%;
}

.toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  min-height: 36px;
  border-radius: 999px;
  border: 1px solid var(--btn-ghost-border);
  background: var(--btn-ghost-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  font-family: inherit;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  outline: none;
  -webkit-appearance: none;
  appearance: none;
  touch-action: manipulation;
  transition: background 0.16s, border-color 0.16s, color 0.16s,
              box-shadow 0.16s, transform 0.1s;
}
.toggle-btn svg { flex: none; }
.toggle-btn:hover:not(.active) {
  background: var(--btn-ghost-hover);
  border-color: rgba(0, 0, 0, 0.12);
  color: var(--text-primary);
}
.toggle-btn:active {
  transform: scale(0.97);
}
.toggle-btn.active {
  color: var(--blue);
  background: var(--blue-light);
  border-color: rgba(0, 113, 227, 0.22);
}
.toggle-btn:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

/* ── 棋盘卡片（毛玻璃） ── */
.board-card {
  width: 100%;
  max-width: 720px;
  background: var(--card-bg);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--card-shadow);
  padding: 16px;
  box-sizing: border-box;
  transition: box-shadow 0.3s ease;
}
.board-card:hover {
  box-shadow: 0 12px 56px rgba(0,0,0,0.15), 0 3px 12px rgba(0,0,0,0.08);
}

#Gomoku {
  display: block;
  border-radius: var(--radius-lg);
  cursor: crosshair;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
}

/* ── 操作区 ── */
.controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-top: 16px;
  flex-wrap: wrap;
  max-width: 720px;
  width: 100%;
}

/* ── 按钮 ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 9px 18px;
  min-height: 44px;
  border-radius: var(--radius-lg);
  font-size: 0.875rem;
  font-weight: 500;
  font-family: inherit;
  letter-spacing: -0.01em;
  cursor: pointer;
  border: 1px solid transparent;
  outline: none;
  -webkit-appearance: none;
  appearance: none;
  touch-action: manipulation;
  transition: background 0.16s, border-color 0.16s, opacity 0.16s,
              transform 0.1s, box-shadow 0.16s;
  white-space: nowrap;
}

.btn-primary {
  background: var(--blue-light);
  border-color: rgba(0, 113, 227, 0.18);
  color: var(--blue);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.btn-primary:hover:not(:disabled) {
  background: var(--blue-mid);
  border-color: rgba(0, 113, 227, 0.35);
  box-shadow: 0 4px 16px rgba(0, 113, 227, 0.18);
  transform: translateY(-1px);
}
.btn-primary:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: none;
}

.btn-ghost {
  background: var(--btn-ghost-bg);
  border-color: var(--btn-ghost-border);
  color: var(--text-secondary);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.btn-ghost:hover:not(:disabled) {
  background: var(--btn-ghost-hover);
  border-color: rgba(0,0,0,0.15);
  color: var(--text-primary);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}
.btn-ghost:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: none;
}

.btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}
.btn:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

/* ── 桌面端优化 (≥769px) ── */
@media (min-width: 769px) and (max-width: 1023px) {
  .game-wrapper {
    padding: 50px 32px 60px;
  }
  .board-card {
    max-width: min(600px, calc(100vw - 64px));
  }
  .game-header {
    margin-bottom: 28px;
  }
  #title {
    font-size: clamp(1.8rem, 4vw, 2.4rem);
  }
  .controls,
  .toggles,
  .quote-area {
    max-width: min(600px, calc(100vw - 64px));
  }
}

/* ── 标准桌面 (≥1024px) ── */
@media (min-width: 1024px) {
  .game-wrapper {
    padding: 60px 40px 72px;
    justify-content: flex-start;
    padding-top: max(60px, calc(50vh - 400px));
  }
  .board-card {
    max-width: min(680px, calc(100vw - 80px));
  }
  .game-header {
    margin-bottom: 36px;
  }
  #title {
    font-size: clamp(1.8rem, 3vw, 2.4rem);
  }
  .subtitle {
    font-size: 0.9rem;
  }
  .controls {
    margin-top: 18px;
    gap: 10px;
    max-width: min(680px, calc(100vw - 80px));
  }
  .quote-area {
    margin-top: 32px;
    max-width: min(680px, calc(100vw - 80px));
  }
  .quote-text {
    font-size: 0.95rem;
  }
}

/* ── 大屏幕 (≥1280px) ── */
@media (min-width: 1280px) {
  .game-wrapper {
    padding: 80px 60px 80px;
    padding-top: max(80px, calc(50vh - 420px));
  }
  .board-card {
    max-width: 640px;
    padding: 18px;
  }
  .game-header {
    margin-bottom: 40px;
  }
  #title {
    font-size: 2.4rem;
  }
  .subtitle {
    font-size: 0.95rem;
  }
  .controls,
  .toggles,
  .quote-area {
    width: 640px;
    max-width: 640px;
  }
  .controls {
    gap: 12px;
  }
  .quote-card {
    padding: 20px 24px 16px;
  }
  .quote-text {
    font-size: 1rem;
  }
}

/* ── 超大屏幕 (≥1600px) ── */
@media (min-width: 1600px) {
  .game-wrapper {
    padding: 100px 80px 100px;
    padding-top: max(100px, calc(50vh - 450px));
  }
  .board-card {
    max-width: 700px;
    padding: 22px;
  }
  .game-header {
    margin-bottom: 48px;
  }
  #title {
    font-size: 2.8rem;
  }
  .subtitle {
    font-size: 1rem;
  }
  .controls,
  .toggles,
  .quote-area {
    width: 700px;
    max-width: 700px;
  }
  .controls {
    gap: 12px;
  }
  .btn {
    padding: 10px 18px;
    font-size: 0.88rem;
  }
  .quote-text {
    font-size: 1rem;
  }
  /* 棋盘阴影增强 */
  .board-card {
    box-shadow: 0 12px 60px rgba(0, 0, 0, 0.15), 0 4px 16px rgba(0, 0, 0, 0.08);
  }
  .board-card:hover {
    box-shadow: 0 16px 80px rgba(0, 0, 0, 0.2), 0 6px 20px rgba(0, 0, 0, 0.1);
  }
}

/* ── 超宽屏 (≥1920px) ── */
@media (min-width: 1920px) {
  .game-wrapper {
    padding: 120px 100px 120px;
    padding-top: max(120px, calc(50vh - 480px));
  }
  .board-card {
    max-width: 760px;
  }
  #title {
    font-size: 3.2rem;
  }
  .subtitle {
    font-size: 1.05rem;
  }
  .controls,
  .toggles,
  .quote-area {
    width: 760px;
    max-width: 760px;
  }
  .btn {
    padding: 12px 24px;
    font-size: 0.95rem;
  }
}

/* ── 移动端 ── */
@media (max-width: 480px) {
  .game-wrapper {
    padding-top: max(28px, env(safe-area-inset-top, 28px));
    padding-right: max(12px, env(safe-area-inset-right, 12px));
    padding-bottom: max(36px, env(safe-area-inset-bottom, 36px));
    padding-left: max(12px, env(safe-area-inset-left, 12px));
  }
  .game-header  { margin-bottom: 18px; }
  #title        { font-size: 1.6rem; }
  .subtitle     { font-size: 0.75rem; margin-top: 6px; }
  .shortcuts-hint { display: none; }
  .mode-badge   { font-size: 0.6rem; padding: 2px 8px; }
  .toggles      { margin-top: 8px; gap: 6px; }
  .toggle-btn   { padding: 5px 11px; min-height: 32px; font-size: 0.72rem; gap: 4px; }
  .toggle-btn svg { width: 13px; height: 13px; }
  .board-card   { padding: 8px; border-radius: var(--radius-lg); }
  .controls     { margin-top: 10px; gap: 6px; }
  .btn          { padding: 8px 12px; font-size: 0.78rem; min-height: 40px; gap: 4px; }
  .btn svg       { width: 13px; height: 13px; }
  .bg-orb       { filter: blur(48px); }
  .orb-1        { width: 280px; height: 280px; }
  .orb-2        { width: 240px; height: 240px; }
  .orb-3        { width: 220px; height: 220px; }
}
@media (max-width: 360px) {
  .btn      { padding: 7px 10px; font-size: 0.75rem; min-height: 38px; }
  .toggle-btn { padding: 4px 9px; font-size: 0.68rem; min-height: 30px; }
  .toggles  { gap: 4px; }
  #title    { font-size: 1.4rem; }
}

/* ── 超小屏幕 (< 320px) ── */
@media (max-width: 320px) {
  .game-wrapper { padding: 20px 8px 30px; }
  .game-header  { margin-bottom: 14px; }
  #title        { font-size: 1.3rem; }
  .subtitle     { font-size: 0.7rem; }
  .board-card   { padding: 6px; }
  .controls     { gap: 4px; }
  .btn          { padding: 6px 8px; font-size: 0.72rem; min-height: 36px; }
  .quote-area   { margin-top: 12px; }
  .quote-card   { padding: 10px 12px 8px; }
  .quote-text   { font-size: 0.8rem; }
}

/* ── 中等设备：平板竖屏 / 手机横屏 (481px–768px) ── */
@media (min-width: 481px) and (max-width: 768px) {
  .game-wrapper {
    padding-top:    max(36px, env(safe-area-inset-top,    36px));
    padding-right:  max(20px, env(safe-area-inset-right,  20px));
    padding-bottom: max(40px, env(safe-area-inset-bottom, 40px));
    padding-left:   max(20px, env(safe-area-inset-left,   20px));
  }
  .board-card {
    max-width: min(540px, calc(100vw - 40px));
  }
  .controls,
  .toggles,
  .quote-area {
    max-width: min(540px, calc(100vw - 40px));
  }
}

/* ── 低功耗模式：减少动画 ── */
@media (prefers-reduced-motion: reduce) {
  .bg-orb   { animation: none; }
  .btn      { transition: none; }
  .toggle-btn, .mode-toggle { transition: none; }
  .quote-text, .quote-source { transition: none; }
}

/* ── 名言区 ── */
.quote-area {
  margin-top: 24px;
  width: 100%;
  max-width: 720px;
  padding: 0 4px;
}

.quote-card {
  background: rgba(255, 255, 255, 0.48);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid rgba(255, 255, 255, 0.78);
  border-radius: 16px;
  padding: 18px 20px 14px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.07);
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: box-shadow 0.25s;
}
.quote-card:hover {
  box-shadow: 0 6px 28px rgba(0,0,0,0.11);
}

.quote-body {
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.quote-mark {
  font-size: 2.4rem;
  line-height: 0.8;
  color: rgba(0, 113, 227, 0.25);
  font-family: Georgia, serif;
  flex-shrink: 0;
  margin-top: 2px;
  user-select: none;
}

.quote-content {
  flex: 1;
  min-width: 0;
}

.quote-text {
  font-size: 0.93rem;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.65;
  letter-spacing: 0.03em;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}
.quote-text.visible {
  opacity: 1;
  transform: translateY(0);
}

.quote-source {
  margin-top: 7px;
  font-size: 0.74rem;
  color: var(--text-tertiary);
  letter-spacing: 0.06em;
  opacity: 0;
  transition: opacity 0.4s ease 0.1s;
}
.quote-source.visible {
  opacity: 1;
}

.quote-btn {
  align-self: flex-end;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 12px;
  min-height: 36px;
  border-radius: 20px;
  border: 1px solid rgba(0,0,0,0.08);
  background: rgba(255,255,255,0.6);
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-family: inherit;
  cursor: pointer;
  outline: none;
  -webkit-appearance: none;
  appearance: none;
  touch-action: manipulation;
  transition: background 0.15s, color 0.15s, transform 0.1s;
}
.quote-btn:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}
.quote-btn:hover {
  background: rgba(255,255,255,0.9);
  color: var(--text-primary);
  transform: translateY(-1px);
}
.quote-btn:active {
  transform: translateY(0);
}

@media (max-width: 480px) {
  .quote-area   { margin-top: 16px; }
  .quote-card   { padding: 14px 16px 12px; }
  .quote-text   { font-size: 0.87rem; }
  .quote-mark   { font-size: 2rem; }
}

/* 换一句按钮图标旋转动画 */
@keyframes spin-once {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}
.spin-once {
  animation: spin-once 0.42s ease forwards;
}

/* ── 触摸反馈动画 ── */
@keyframes touchRipple {
  0%   { transform: translate(-50%, -50%) scale(0); opacity: 1; }
  100% { transform: translate(-50%, -50%) scale(1.5); opacity: 0; }
}

/* ── 按钮触摸状态 ── */
.btn.touching {
  transform: scale(0.95) !important;
  opacity: 0.85;
}

/* ── 触摸设备优化：禁用hover效果 ── */
@media (hover: none) and (pointer: coarse) {
  .board-card:hover {
    box-shadow: var(--card-shadow);
  }
  .quote-card:hover {
    box-shadow: 0 4px 20px rgba(0,0,0,0.07);
  }
  .btn:hover:not(:disabled) {
    transform: none;
    box-shadow: none;
  }
  .btn-ghost:hover:not(:disabled) {
    background: var(--btn-ghost-bg);
    border-color: var(--btn-ghost-border);
    color: var(--text-secondary);
  }
}

/* ── 防止iOS橡皮筋效果 ── */
html, body {
  overscroll-behavior: contain;
}