/* ============================================================
   双拼训练 - 全局样式（CSS 自定义属性 + 深色模式）
   ============================================================ */

/* =========================== CSS 变量 =========================== */
:root {
  /* 暖色调色板 */
  --color-bg:            #fdf8f2;
  --color-bg-card:       #fffaf5;
  --color-surface:       #ffffff;
  --color-surface-hover: #fff8f0;
  --color-border:        #e8d0b8;
  --color-border-light:  #f0d5ba;
  --color-border-strong: #d4855c;

  /* 文字 */
  --color-text:          #3a2a1a;
  --color-text-secondary:#6b5544;
  --color-text-muted:    #9c8470;
  --color-text-inverse:  #fffaf5;

  /* 主色调 */
  --color-primary:       #c86a3a;
  --color-primary-light: #d4855c;
  --color-primary-dark:  #a0582e;
  --color-primary-bg:    #fff8f0;
  --color-primary-border:#d4855c;
  --color-primary-100:   #ffe8d6;

  /* 语义色 */
  --color-success:       #4a9e5c;
  --color-success-bg:    #eaf5ec;
  --color-error:         #d4534a;
  --color-error-bg:      #fde8e6;
  --color-info:          #3b82f6;
  --color-warning:       #f59e0b;

  /* 间距 */
  --space-xs:  4px;
  --space-sm:  8px;
  --space-md:  16px;
  --space-lg:  24px;
  --space-xl:  32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  /* 圆角 */
  --radius-sm:  6px;
  --radius-md:  8px;
  --radius-lg:  12px;
  --radius-xl:  16px;
  --radius-2xl: 24px;

  /* 阴影 */
  --shadow-sm:  0 1px 3px rgba(160,120,80,0.08);
  --shadow-md:  0 4px 12px rgba(160,120,80,0.1);
  --shadow-lg:  0 8px 32px rgba(160,120,80,0.15);
  --shadow-xl:  0 12px 48px rgba(160,120,80,0.2);

  /* 字体 */
  --font-sans:  -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
  --font-mono:  'SF Mono', 'Cascadia Code', 'Consolas', monospace;

  /* 过渡 */
  --transition-fast: 0.15s ease;
  --transition-base: 0.25s ease;
  --transition-slow: 0.4s ease;
}

/* =========================== 深色模式 =========================== */
.dark {
  --color-bg:            #1a1512;
  --color-bg-card:       #241e1a;
  --color-surface:       #2d2622;
  --color-surface-hover: #342d28;
  --color-border:        #3d3530;
  --color-border-light:  #4a403a;
  --color-border-strong: #8a6050;

  --color-text:          #e8d5c8;
  --color-text-secondary:#b8a090;
  --color-text-muted:    #7a6a5a;
  --color-text-inverse:  #1a1512;

  --color-primary:       #d4855c;
  --color-primary-light: #e0a080;
  --color-primary-dark:  #b06848;
  --color-primary-bg:    #2a2018;
  --color-primary-border:#8a6050;
  --color-primary-100:   #3a2820;

  --color-success:       #5cba6e;
  --color-success-bg:    #1a2e20;
  --color-error:         #e0605a;
  --color-error-bg:      #2e1a18;
  --color-info:          #4a90d9;
  --color-warning:       #d9a040;

  --shadow-sm:  0 1px 3px rgba(0,0,0,0.2);
  --shadow-md:  0 4px 12px rgba(0,0,0,0.25);
  --shadow-lg:  0 8px 32px rgba(0,0,0,0.3);
  --shadow-xl:  0 12px 48px rgba(0,0,0,0.35);
}

/* =========================== 基础重置 =========================== */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  transition: background var(--transition-base), color var(--transition-base);
  overflow-x: hidden;
}

section[id] {
  scroll-margin-top: 64px;
}

/* =========================== 深色模式切换按钮 =========================== */
#darkModeToggle {
  cursor: pointer;
  transition: transform var(--transition-fast);
}

#darkModeToggle:hover {
  transform: scale(1.1);
}

/* =========================== 导航栏 =========================== */
.nav-link {
  transition: color var(--transition-fast), background var(--transition-fast);
}

.nav-link.active-nav {
  color: var(--color-primary);
  font-weight: 600;
}

/* =========================== 键盘 =========================== */
.keyboard-row {
  display: flex;
  gap: 6px;
  justify-content: center;
}

.key {
  width: 64px;
  height: 64px;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
  cursor: default;
}

.key .sheng {
  color: var(--color-primary);
  font-weight: 700;
  font-size: 17px;
  line-height: 1;
}

.key .yun {
  color: var(--color-text-secondary);
  font-size: 14px;
  font-weight: 500;
  line-height: 1;
}

.key.hide-yun .yun { visibility: hidden; }
.key.hide-sheng .sheng { visibility: hidden; }

.key.home-row {
  border-color: var(--color-primary-border);
  background: var(--color-primary-bg);
}

.key.active {
  border-color: var(--color-primary-light);
  background: var(--color-primary-bg);
  box-shadow: 0 0 16px rgba(200,106,58,0.3);
}

.key.highlight {
  border-color: var(--color-success);
  background: var(--color-success-bg);
}

.key.wrong-key {
  border-color: var(--color-error);
  background: var(--color-error-bg);
}

.key.keyboard-press {
  background: var(--color-primary-bg);
  box-shadow: 0 0 0 2px var(--color-primary), 0 2px 8px rgba(200,106,58,0.4);
  transform: translateY(2px);
  transition: all 0.05s;
}

.key.blind-hint .yun {
  animation: pulse-hint 2s infinite;
}

@keyframes pulse-hint {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}

/* =========================== 练习区 =========================== */
.current-char {
  font-size: 130px;
  font-weight: 700;
  color: var(--color-text);
  min-height: 170px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--transition-fast);
  word-break: break-all;
}

.current-char.has-multi {
  font-size: 80px;
  min-height: 110px;
  letter-spacing: 6px;
}

.current-char.article-text {
  font-size: 22px;
  line-height: 2;
  text-align: left;
  word-break: break-all;
  min-height: auto;
  display: block;
  letter-spacing: normal;
}

.current-char.correct { color: var(--color-success); }
.current-char.wrong   { color: var(--color-error); }

.article-text {
  font-size: 22px;
  line-height: 2;
  text-align: left;
  word-break: break-all;
}

/* =========================== 字符高亮（文章/测速共用） =========================== */
.char-span {
  display: inline;
  padding: 0 1px;
  border-radius: 2px;
  transition: background var(--transition-fast);
}

.char-span.current {
  background: var(--color-primary-100);
  border-bottom: 3px solid var(--color-primary);
}

.char-span.done-correct { color: var(--color-success); }
.char-span.done-wrong   { color: var(--color-error); }

/* 测速特有 */
.speed-done { color: var(--color-text); }
.speed-wrong {
  color: var(--color-error);
  background: var(--color-error-bg);
  border-radius: 2px;
  text-decoration: underline;
}
.speed-current {
  background: var(--color-primary-bg);
  border-bottom: 2px solid var(--color-primary);
  color: var(--color-primary);
  font-weight: 700;
  animation: blink-cursor 0.8s infinite;
}

@keyframes blink-cursor {
  0%, 100% { border-bottom-color: var(--color-primary); }
  50% { border-bottom-color: transparent; }
}

/* =========================== 标签导航 =========================== */
.stage-tab {
  position: relative;
  white-space: nowrap;
}

.stage-tab.active-tab::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-primary);
  border-radius: 2px;
}

/* =========================== 按钮 =========================== */
.btn-primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border: none;
  border-radius: var(--radius-lg);
  padding: 8px 20px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-primary:active {
  transform: scale(0.96);
}

/* =========================== 难度选择器 =========================== */
.diff-active {
  transform: scale(1.05);
  box-shadow: var(--shadow-md);
}

.diff-btn:not(.diff-active) { opacity: 0.65; }
.diff-btn:not(.diff-active):hover { opacity: 0.9; }

/* =========================== 易混淆键位徽章 =========================== */
.badge-key {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  font-size: 0.8rem;
  font-weight: 700;
  background: var(--color-border-light);
  color: var(--color-text);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

/* =========================== Tooltip =========================== */
.kb-tooltip {
  position: fixed;
  z-index: 9999;
  background: var(--color-text);
  color: var(--color-bg);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-family: var(--font-sans);
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition-fast);
  white-space: nowrap;
  box-shadow: var(--shadow-lg);
}

.kb-tooltip.show { opacity: 1; }

/* =========================== 测速模块 =========================== */
.text-active {
  background: var(--color-primary) !important;
  color: var(--color-text-inverse) !important;
  border-color: var(--color-primary) !important;
}

/* =========================== 结果弹窗 =========================== */
@keyframes popIn {
  from { opacity: 0; transform: scale(0.9) translateY(20px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

#resultOverlay > div {
  animation: popIn 0.3s ease-out;
}

/* =========================== 卡片通用 =========================== */
.compare-card,
.path-card,
.resource-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.compare-card:hover,
.path-card:hover,
.resource-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

/* =========================== FAQ =========================== */
.faq-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  transition: box-shadow var(--transition-base);
}

.faq-item:hover {
  box-shadow: var(--shadow-sm);
}

.faq-item .faq-toggle i {
  transition: transform 0.3s;
}

.faq-item.open .faq-toggle i {
  transform: rotate(180deg);
}

.faq-body { display: none; }
.faq-body.show { display: block; }

/* =========================== 页面加载动画 =========================== */
section {
  animation: fadeInUp 0.5s ease-out both;
}

section:nth-child(2) { animation-delay: 0.05s; }
section:nth-child(3) { animation-delay: 0.1s; }
section:nth-child(4) { animation-delay: 0.15s; }
section:nth-child(5) { animation-delay: 0.2s; }
section:nth-child(6) { animation-delay: 0.25s; }
section:nth-child(7) { animation-delay: 0.3s; }
section:nth-child(8) { animation-delay: 0.35s; }
section:nth-child(9) { animation-delay: 0.4s; }

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

/* =========================== 实用动画 =========================== */
.animate-in {
  animation: popIn 0.2s ease-out;
}

/* 按钮脉冲 */
@keyframes btnPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(200,106,58,0.3); }
  50% { box-shadow: 0 0 0 8px rgba(200,106,58,0); }
}

/* =========================== 响应式 =========================== */

/* --- 平板 --- */
@media (max-width: 768px) {
  .stage-tabs-scroll {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .stage-tabs-scroll::-webkit-scrollbar { display: none; }

  section {
    padding-top: 2.5rem;
    padding-bottom: 2.5rem;
  }

  .current-char {
    font-size: 90px;
    min-height: 120px;
  }
  .current-char.has-multi {
    font-size: 56px;
    min-height: 80px;
    letter-spacing: 4px;
  }
  .current-char.article-text {
    font-size: 18px;
    line-height: 1.8;
  }

  .key {
    width: 48px;
    height: 48px;
    font-size: 10px;
  }
  .key .sheng { font-size: 13px; }
  .key .yun   { font-size: 10px; }
}

/* --- 手机（小屏） --- */
@media (max-width: 480px) {
  html { font-size: 15px; }

  section {
    padding-top: 2rem;
    padding-bottom: 2rem;
  }

  .current-char {
    font-size: 64px;
    min-height: 90px;
  }
  .current-char.has-multi {
    font-size: 36px;
    min-height: 56px;
    letter-spacing: 2px;
  }
  .current-char.article-text {
    font-size: 15px;
    line-height: 1.7;
  }

  .key {
    width: 32px;
    height: 32px;
    border-width: 1.5px;
    border-radius: 5px;
  }
  .key .sheng { font-size: 8px; }
  .key .yun   { font-size: 7px; }

  .keyboard-row { gap: 3px; }

  /* 统计卡片紧凑 */
  #practice .flex.justify-center .bg-warm-50 {
    min-width: 70px;
    padding: 0.5rem 0.75rem;
  }

  /* 导航栏自适应 */
  nav .flex.gap-1 { gap: 2px; }
  nav .nav-link { padding: 4px 6px; font-size: 0.8rem; }

  /* 测速文本区 */
  #speedTarget {
    font-size: 0.95rem;
    max-height: 150px;
  }

  /* 弹窗 */
  #resultOverlay > div {
    padding: 1.5rem;
    max-width: 90vw;
  }
}

/* =========================== 深色模式 Tailwind 覆盖 =========================== */
.dark nav {
  background: rgba(30, 27, 24, 0.95);
  border-bottom-color: #3d3530;
}

.dark .bg-white   { background: var(--color-surface) !important; }
.dark .bg-white\/50,
.dark .bg-white\/95 { background: rgba(45, 38, 34, 0.95) !important; }
.dark .bg-warm-50 { background: var(--color-bg-card) !important; }
.dark .bg-warm-100 { background: #2a2420 !important; }
.dark .bg-warm-200 { background: #302824 !important; }

.dark .border-warm-300 { border-color: var(--color-border) !important; }
.dark .border-warm-400 { border-color: var(--color-border-light) !important; }
.dark .border-warm-500 { border-color: var(--color-border-strong) !important; }
.dark .border-t-warm-300 { border-top-color: var(--color-border) !important; }
.dark .border-b-warm-400 { border-bottom-color: var(--color-border-light) !important; }

.dark .text-warm-400 { color: var(--color-text-muted) !important; }
.dark .text-warm-500 { color: var(--color-text-muted) !important; }
.dark .text-warm-600 { color: var(--color-text-secondary) !important; }
.dark .text-warm-700 { color: var(--color-primary) !important; }
.dark .text-warm-800 { color: var(--color-primary-dark) !important; }
.dark .text-warm-900 { color: var(--color-text) !important; }

.dark .text-gray-500 { color: var(--color-text-muted) !important; }

.dark .hover\:bg-warm-100:hover { background: #3a3028 !important; }

.dark .from-warm-100 { --tw-gradient-from: #1a1512; }
.dark .via-warm-200  { --tw-gradient-stops: var(--tw-gradient-from), #1e1814; }
.dark .to-warm-300    { --tw-gradient-to: #241e1a; }

.dark #schemeSelect {
  background: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-border-strong);
}

.dark #darkModeToggle {
  background: #3d3530;
  border-color: #5a4a40;
  color: #e0c8a8;
}

.dark .kb-tooltip {
  background: var(--color-bg-card);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.dark #speedTarget {
  background: var(--color-surface) !important;
  border-color: var(--color-border) !important;
}

.dark #speedInput {
  background: var(--color-surface) !important;
  border-color: var(--color-border) !important;
  color: var(--color-text) !important;
}

.dark #speedInput:focus {
  border-color: var(--color-primary) !important;
}

.dark #speedInput::placeholder {
  color: var(--color-text-muted) !important;
}

.dark #speedInput:disabled {
  background: #1a1512 !important;
  color: var(--color-text-muted) !important;
}

.dark .speed-wrong { background: rgba(239, 68, 68, 0.15); }

/* =========================== 导航栏移动端适配 =========================== */
@media (max-width: 480px) {
  nav .container,
  nav .max-w-5xl { padding-left: 8px; padding-right: 8px; }

  #schemeSelect { font-size: 0.7rem; padding: 3px 6px; }
  #showKeysBtn   { font-size: 0.7rem; padding: 3px 6px; }
  #darkModeToggle { width: 28px; height: 28px; }
}