/* ========== 科技感 UI · 昼夜自适应 · 字体美化版 ========== */
:root {
  --bg: #f4f7fc;
  --surface: rgba(255, 255, 255, 0.75);
  --surface-solid: #ffffff;
  --border: rgba(0, 120, 255, 0.15);
  --text: #1a2634;
  --text-dim: #5b6b7c;
  --primary: #0d8bf0;
  --primary-glow: rgba(13, 139, 240, 0.3);
  --radius: 14px;
  --shadow: 0 8px 30px rgba(0, 80, 180, 0.08);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
}
body.dark {
  --bg: #0b0f14;
  --surface: rgba(18, 26, 36, 0.8);
  --surface-solid: #121a24;
  --border: rgba(0, 180, 255, 0.2);
  --text: #e8f0fe;
  --text-dim: #8fa3b8;
  --primary: #2fa8ff;
  --primary-glow: rgba(47, 168, 255, 0.4);
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.5);
}

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

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.7;
  letter-spacing: 0.3px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
  transition: background 0.3s, color 0.3s;
  padding: 12px;
  -webkit-tap-highlight-color: transparent;
}

/* 应用容器 */
.app {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* 顶栏 */
.app-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: var(--surface);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 1.15rem;
}
.brand img { height: 34px; width: auto; }
.brand-name sup { font-size: 0.6em; color: var(--primary); }

/* 主题按钮 */
.theme-btn {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 42px;
  height: 42px;
  cursor: pointer;
  color: var(--text);
  font-size: 1.2rem;
  display: grid;
  place-items: center;
  transition: all 0.2s;
}
.theme-btn:hover { border-color: var(--primary); box-shadow: 0 0 12px var(--primary-glow); }
.theme-btn::before { content: "🌙"; }
body.dark .theme-btn::before { content: "☀️"; }

/* 卡片 */
.card {
  background: var(--surface);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: 0 4px 20px rgba(0, 80, 180, 0.06);
  padding: 18px;
}
body.dark .card {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

/* 按钮 */
.qq_button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 18px;
  background: var(--surface-solid);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 0.95rem;
  font-family: var(--font);
  letter-spacing: 0.5px;
  cursor: pointer;
  user-select: none;
  transition: all 0.2s;
  min-height: 44px;
  text-align: center;
  text-decoration: none;
}
.qq_button:hover {
  border-color: var(--primary);
  box-shadow: 0 0 14px var(--primary-glow);
  transform: translateY(-1px);
  text-decoration: none;
}
.qq_button:active { transform: scale(0.97); }
.qq_button.primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.qq_button.primary:hover { filter: brightness(1.1); }

/* 模式入口卡片 - 2x2 网格横向布局 */
.mode-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}
.mode-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: 0 4px 20px rgba(0, 80, 180, 0.06);
  padding: 18px 16px;
  display: flex;
  align-items: center;
  gap: 14px;
  cursor: pointer;
  text-align: left;
  color: var(--text);
  font-family: var(--font);
  transition: all 0.25s;
  min-height: 88px;
  overflow: hidden;
}
body.dark .mode-card { box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4); }
.mode-card::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 4px;
  background: var(--primary);
  opacity: 0;
  transition: opacity 0.25s;
}
.mode-card:hover {
  border-color: var(--primary);
  box-shadow: 0 8px 28px var(--primary-glow);
  transform: translateY(-3px);
}
.mode-card:hover::before { opacity: 1; }

.mode-icon {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  display: grid;
  place-items: center;
  background: var(--primary);
  color: #fff;
  border-radius: 14px;
  font-size: 1.45rem;
  box-shadow: 0 4px 12px var(--primary-glow);
}
/* 每个模式不同配色 */
.mode-card[data-color="purple"] .mode-icon { background: linear-gradient(135deg, #8b5cf6, #6d28d9); box-shadow: 0 4px 12px rgba(139,92,246,0.35); }
.mode-card[data-color="teal"]   .mode-icon { background: linear-gradient(135deg, #14b8a6, #0d9488); box-shadow: 0 4px 12px rgba(20,184,166,0.35); }
.mode-card[data-color="orange"] .mode-icon { background: linear-gradient(135deg, #f97316, #ea580c); box-shadow: 0 4px 12px rgba(249,115,22,0.35); }
.mode-card[data-color="purple"]:hover { border-color: #8b5cf6; }
.mode-card[data-color="teal"]:hover   { border-color: #14b8a6; }
.mode-card[data-color="orange"]:hover { border-color: #f97316; }
.mode-card[data-color="purple"]:hover::before { background: #8b5cf6; }
.mode-card[data-color="teal"]:hover::before   { background: #14b8a6; }
.mode-card[data-color="orange"]:hover::before { background: #f97316; }

.mode-text {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
  flex: 1;
}
.mode-name {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.mode-desc {
  font-size: 0.8rem;
  color: var(--text-dim);
  line-height: 1.35;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

/* 小屏幕：1 列 */
@media (max-width: 560px) {
  .mode-grid {
    grid-template-columns: 1fr;
    gap: 10px;
  }
  .mode-card {
    padding: 14px 14px;
    min-height: 76px;
    gap: 12px;
  }
  .mode-icon {
    width: 42px;
    height: 42px;
    font-size: 1.25rem;
  }
  .mode-name { font-size: 1rem; }
  .mode-desc { font-size: 0.76rem; -webkit-line-clamp: 1; }
}

/* 表单元素 */
input[type="text"], input[type="number"], input[type="password"], input[type="search"] {
  font-size: 1rem;
  font-family: var(--font);
  letter-spacing: 0.5px;
  height: 44px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface-solid);
  color: var(--text);
  outline: none;
  transition: border 0.2s, box-shadow 0.2s;
  width: 100%;
  max-width: 100%;
}
input:focus { border-color: var(--primary); box-shadow: 0 0 10px var(--primary-glow); }
select {
  width: 100%;
  font-size: 1rem;
  font-family: var(--font);
  letter-spacing: 0.5px;
  height: 44px;
  padding: 0 10px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface-solid);
  color: var(--text);
}
label { font-size: 0.95rem; color: var(--text); }

/* 页面通用 */
.page { display: flex; flex-direction: column; gap: 16px; }
.btn-row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-top: 10px; }
.tip { font-size: 0.8rem; color: var(--text-dim); }
hr {
  border: none;
  height: 1px;
  background: var(--border);
  margin: 14px 0;
}
small { color: var(--text-dim); font-size: 0.8rem; }

/* 列表与选项 */
ol, ul { padding-left: 1.4em; }
li { margin: 6px 0; }
.answer { font-size: 0.9rem; font-weight: 600; margin-top: 10px; }
.notetitle {
  font-size: 0.9rem;
  background: var(--surface-solid);
  padding: 8px 12px;
  border-radius: 8px;
  margin-top: 0;
  cursor: pointer;
  border: 1px solid var(--border);
}
.notetitle:hover { border-color: var(--primary); }

/* 底部 */
.app-footer {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-dim);
  padding: 16px 0;
  border-top: 1px solid var(--border);
  margin-top: 8px;
}
.brand-line { font-weight: 600; color: var(--text); margin-bottom: 4px; }

/* 折叠面板：改为"浅底 + 边框"，不用大面积蓝底 */
.collapse-header {
  background: var(--surface-solid);
  color: var(--text);
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  user-select: none;
  font-size: 0.9rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s;
}
.collapse-header:hover {
  border-color: var(--primary);
  background: var(--primary-glow);
  color: var(--primary);
}
.collapse-header small {
  color: inherit !important;
  font-size: 0.92rem;
}
.collapse-body {
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-top: none;
  border-radius: 0 0 8px 8px;
  background: var(--surface-solid);
}

/* 水墨屏下：折叠标题也走黑白 */
body.ink .collapse-header {
  background: #ffffff !important;
  color: #000000 !important;
  border: 1.5px solid #000000 !important;
}
body.ink .collapse-header:hover {
  background: #eeeeee !important;
}

/* ===== 标题字体层级美化 ===== */
h1, h2, h3, h4 {
  font-weight: 600;
  letter-spacing: -0.5px;
  color: var(--text);
  margin-bottom: 0.5em;
}
h2 { font-size: 1.3rem; }
h3 { font-size: 1.1rem; }
p { font-size: 1.05rem; line-height: 1.7; }

/* ============================================================
   ★ 新增 1：文字链接统一美化
   ============================================================ */
a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s, background 0.2s, transform 0.15s;
}
a:hover {
  color: var(--primary);
  text-decoration: underline;
  text-decoration-thickness: 1.5px;
  text-underline-offset: 3px;
  text-decoration-color: var(--primary);
}
/* 按钮型链接不要下划线 */
a.qq_button, a.btn-sm, a.mode-card, a.brand { text-decoration: none !important; }

/* 显式的 text-link 类：更精致的下划线动画 + 悬停背景 */
.text-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 8px;
  transition: background 0.2s, transform 0.15s;
  position: relative;
}
.text-link:hover {
  background: var(--primary-glow);
  color: var(--primary);
  text-decoration: none;
}
.text-link:active { transform: scale(0.96); }

/* ============================================================
   ★ 新增 2：右下角浮动按钮（返回首页 + 返回顶部）
   ============================================================ */
.float-btns {
  position: fixed;
  right: 16px;
  bottom: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 900;
  pointer-events: none;
}
.float-btn {
  pointer-events: auto;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--surface-solid);
  border: 1px solid var(--border);
  box-shadow: 0 4px 16px rgba(0, 80, 180, 0.15);
  display: grid;
  place-items: center;
  font-size: 1.15rem;
  cursor: pointer;
  color: var(--text);
  text-decoration: none !important;
  transition: all 0.25s;
  user-select: none;
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}
.float-btn:hover {
  border-color: var(--primary);
  box-shadow: 0 6px 22px var(--primary-glow);
  transform: translateY(-2px);
  text-decoration: none;
}
.float-btn:active { transform: scale(0.94); }
body.dark .float-btn {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.5);
  background: rgba(18, 26, 36, 0.9);
}
#floatTop {
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.25s, visibility 0.25s, transform 0.25s;
}
#floatTop.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
@media (max-width: 480px) {
  .float-btns { right: 12px; bottom: 16px; gap: 8px; }
  .float-btn { width: 42px; height: 42px; font-size: 1.05rem; }
}

/* ============================================================
   ★ 新增 3：注册页专用美化
   ============================================================ */
.register-wrap {
  max-width: 480px;
  margin: 40px auto;
  animation: fadeInUp 0.55s cubic-bezier(0.16, 1, 0.3, 1);
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}
.register-card {
  background: var(--surface);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: 0 12px 40px rgba(0, 80, 180, 0.1);
  padding: 34px 28px 26px;
}
body.dark .register-card {
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
}
.register-card h2 {
  font-size: 1.5rem;
  margin: 0 0 6px;
  text-align: center;
  letter-spacing: -0.5px;
}
.register-card .subtitle {
  text-align: center;
  color: var(--text-dim);
  font-size: 0.88rem;
  margin-bottom: 24px;
}
.form-item { margin-bottom: 14px; }
.form-item label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 6px;
  font-weight: 500;
}
.form-item input {
  width: 100%;
  height: 46px;
  padding: 0 14px;
  font-size: 1rem;
  font-family: var(--font);
  color: var(--text);
  background: var(--surface-solid);
  border: 1.5px solid var(--border);
  border-radius: 11px;
  outline: none;
  transition: all 0.22s;
}
.form-item input::placeholder { color: var(--text-dim); opacity: 0.55; }
.form-item input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-glow);
  transform: translateY(-1px);
}
.register-btn {
  width: 100%;
  height: 50px;
  margin-top: 12px;
  background: linear-gradient(135deg, var(--primary) 0%, #0570cc 100%);
  color: #fff;
  font-size: 1.02rem;
  font-weight: 700;
  font-family: var(--font);
  letter-spacing: 3px;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.25s;
  box-shadow: 0 8px 20px var(--primary-glow);
}
.register-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px var(--primary-glow);
  filter: brightness(1.08);
}
.register-btn:active { transform: translateY(0); }
.register-bottom {
  text-align: center;
  margin-top: 22px;
  font-size: 0.9rem;
  color: var(--text-dim);
}
.err-box {
  background: rgba(239, 68, 68, 0.1);
  color: #ef4444;
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 0.9rem;
  margin-bottom: 16px;
  animation: shake 0.4s;
}
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-6px); }
  75% { transform: translateX(6px); }
}

/* 响应式 */
@media (max-width: 480px) {
  body { padding: 8px; font-size: 14px; }
  .mode-card { padding: 16px; }
  .qq_button { padding: 8px 14px; font-size: 0.9rem; }
  .brand img { height: 28px; }
  .brand-name { font-size: 1rem; }
  .register-card { padding: 26px 20px 20px; border-radius: 16px; }
}

/* ========== 底部备案样式 ========== */
.app-footer .footer-icp { margin-top: 4px; font-size: 0.85em; }
.app-footer .footer-icp a {
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.2s;
}
.app-footer .footer-icp a:hover {
  color: var(--primary);
  text-decoration: underline;
}
.app-footer .footer-extra { margin-top: 4px; font-size: 0.85em; opacity: 0.85; }

/* 答题页题干字号与选项一致 */
#desc {
  font-size: inherit;
  line-height: 1.7;
}

/* ★ 返回首页按钮（和夜间模式按钮同款样式） */
.home-btn {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 42px;
  height: 42px;
  cursor: pointer;
  color: var(--text);
  font-size: 1.2rem;
  display: grid;
  place-items: center;
  transition: all 0.2s;
  text-decoration: none !important;
}
.home-btn:hover {
  border-color: var(--primary);
  box-shadow: 0 0 12px var(--primary-glow);
  transform: scale(1.05);
}
.home-btn:active { transform: scale(0.95); }

/* ============================================================
   ★ 水墨屏（E-Ink）主题：高对比、无彩色、无动画
   ============================================================ */
body.ink {
  --bg: #ffffff;
  --surface: #ffffff;
  --surface-solid: #ffffff;
  --border: #000000;
  --text: #000000;
  --text-dim: #444444;
  --primary: #000000;
  --primary-glow: rgba(0, 0, 0, 0.1);
  --radius: 6px;
  --shadow: none;
}

/* 关闭所有过渡、阴影、发光、模糊 */
body.ink * {
  transition: none !important;
  animation: none !important;
  backdrop-filter: none !important;
  -webkit-backdrop-filter: none !important;
  text-shadow: none !important;
}
body.ink .card,
body.ink .mode-card,
body.ink .qq_button {
  box-shadow: none !important;
}

/* 主按钮：黑底白字 */
body.ink .qq_button.primary,
body.ink .mode-icon,
body.ink .step-num,
body.ink .toc-num {
  background: #000000 !important;
  color: #ffffff !important;
  border-color: #000000 !important;
  filter: none !important;
  box-shadow: none !important;
  transform: none !important;
}

/* 模式卡片：悬停时黑边框，不做位移 */
body.ink .mode-card::before { display: none !important; }
body.ink .mode-card:hover {
  border-color: #000000 !important;
  background: #eeeeee !important;
  transform: none !important;
  box-shadow: none !important;
}

/* 主题按钮图标：水墨屏 */
body.ink .theme-btn::before { content: "◐"; }

body.ink .tip-tag {
  background: #ffffff !important;
  border: 1px solid #000000 !important;
  color: #000000 !important;
}

/* ★ 关键：内联的彩色文字全部变成黑/灰高对比 */
body.ink [style*="color:green"],
body.ink [style*="color: green"],
body.ink [style*="color:#16a34a"],
body.ink [style*="color: #16a34a"],
body.ink [style*="color:#15803d"],
body.ink [style*="color: #15803d"] {
  color: #000000 !important;
  font-weight: 700 !important;
}
body.ink [style*="color:#e74c3c"],
body.ink [style*="color: #e74c3c"],
body.ink [style*="color:red"],
body.ink [style*="color: red"],
body.ink [style*="color:#c0392b"],
body.ink [style*="color: #c0392b"] {
  color: #000000 !important;
  font-weight: 700 !important;
  text-decoration: underline !important;
}
body.ink [style*="color:#e67e22"],
body.ink [style*="color: #e67e22"],
body.ink [style*="color:#b45309"],
body.ink [style*="color: #b45309"] {
  color: #000000 !important;
  font-style: italic !important;
}

/* 排行榜里的名次徽章（🥇🥈🥉）不变，分数颜色由上面内联规则接管 */

/* 表单、输入框：黑边白底 */
body.ink input,
body.ink select,
body.ink textarea {
  border: 1.5px solid #000000 !important;
  background: #ffffff !important;
  color: #000000 !important;
}
body.ink input:focus,
body.ink select:focus,
body.ink textarea:focus {
  border-color: #000000 !important;
  box-shadow: 0 0 0 2px #000000 !important;
}

/* 文字链接下划线 */
body.ink .text-link,
body.ink a { color: #000000 !important; }
body.ink .text-link:hover { background: #eeeeee !important; }

/* ============================================================
   ★ 红与黑主题：暗黑背景 + 红色点缀，赛博朋克风
   ============================================================ */
body.crimson {
  --bg: #0A0F16;
  --surface: rgba(26, 35, 50, 0.85);
  --surface-solid: #1A2332;
  --border: rgba(245, 63, 63, 0.2);
  --text: #E5E9F2;
  --text-dim: #8899AA;
  --primary: #F53F3F;
  --primary-glow: rgba(245, 63, 63, 0.35);
  --radius: 14px;
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.6);
}

/* 背景加一点径向红光 */
body.crimson {
  background-image: radial-gradient(ellipse at 50% 0%, rgba(245, 63, 63, 0.06) 0%, transparent 60%);
  background-attachment: fixed;
}

/* 顶栏：深色玻璃 + 红边 */
body.crimson .app-bar {
  background: rgba(26, 35, 50, 0.9);
  border-color: rgba(245, 63, 63, 0.25);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(245, 63, 63, 0.08) inset;
}

/* 卡片：暗黑底 + 红边光晕 */
body.crimson .card {
  background: rgba(26, 35, 50, 0.85);
  border: 1px solid rgba(245, 63, 63, 0.15);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(245, 63, 63, 0.05) inset;
}

/* 主按钮：红色渐变 */
body.crimson .qq_button.primary {
  background: linear-gradient(135deg, #F53F3F 0%, #B91C1C 100%);
  border-color: #F53F3F;
  box-shadow: 0 4px 16px rgba(245, 63, 63, 0.4);
}
body.crimson .qq_button.primary:hover {
  filter: brightness(1.12);
  box-shadow: 0 6px 22px rgba(245, 63, 63, 0.55);
}

/* 普通按钮：暗底红边 */
body.crimson .qq_button {
  background: #1A2332;
  border-color: rgba(245, 63, 63, 0.25);
  color: #E5E9F2;
}
body.crimson .qq_button:hover {
  border-color: #F53F3F;
  box-shadow: 0 0 14px rgba(245, 63, 63, 0.35);
}

/* 模式图标：红色渐变 */
body.crimson .mode-icon {
  background: linear-gradient(135deg, #F53F3F 0%, #B91C1C 100%);
  box-shadow: 0 4px 12px rgba(245, 63, 63, 0.45);
}

/* 模式卡片：悬停红光 */
body.crimson .mode-card {
  background: rgba(26, 35, 50, 0.85);
  border-color: rgba(245, 63, 63, 0.15);
}
body.crimson .mode-card::before {
  background: #F53F3F;
}
body.crimson .mode-card:hover {
  border-color: #F53F3F;
  box-shadow: 0 8px 28px rgba(245, 63, 63, 0.3);
}

/* 主题按钮图标 */
body.crimson .theme-btn::before { content: "🔥"; }
body.crimson .theme-btn {
  border-color: rgba(245, 63, 63, 0.35);
  color: #F53F3F;
}

/* 折叠标题 */
body.crimson .collapse-header {
  background: rgba(26, 35, 50, 0.85);
  color: #E5E9F2;
  border-color: rgba(245, 63, 63, 0.2);
}
body.crimson .collapse-header:hover {
  border-color: #F53F3F;
  background: rgba(245, 63, 63, 0.1);
  color: #FF6B6B;
}
body.crimson .collapse-body {
  background: rgba(26, 35, 50, 0.85);
  border-color: rgba(245, 63, 63, 0.2);
}

/* 品牌名上标 */
body.crimson .brand-name sup { color: #F53F3F; }

/* 文字链接 */
body.crimson a { color: #FF6B6B; }
body.crimson .text-link { color: #FF6B6B; }
body.crimson .text-link:hover {
  background: rgba(245, 63, 63, 0.15);
  color: #FF6B6B;
}

/* 浮动按钮 */
body.crimson .float-btn {
  background: rgba(26, 35, 50, 0.9);
  border-color: rgba(245, 63, 63, 0.3);
  color: #E5E9F2;
}
body.crimson .float-btn:hover {
  border-color: #F53F3F;
  box-shadow: 0 6px 22px rgba(245, 63, 63, 0.4);
}

/* 输入框 */
body.crimson input,
body.crimson select,
body.crimson textarea {
  background: #0F1A2A;
  border-color: rgba(245, 63, 63, 0.25);
  color: #E5E9F2;
}
body.crimson input:focus,
body.crimson select:focus,
body.crimson textarea:focus {
  border-color: #F53F3F;
  box-shadow: 0 0 0 3px rgba(245, 63, 63, 0.25);
}
body.crimson input::placeholder,
body.crimson textarea::placeholder {
  color: #667788;
}

/* 分割线 */
body.crimson hr { background: rgba(245, 63, 63, 0.15); }

/* 底部 */
body.crimson .app-footer {
  border-top-color: rgba(245, 63, 63, 0.15);
}

/* 收藏、跳转等复选框 */
body.crimson input[type="checkbox"] { accent-color: #F53F3F; }

/* 排行表格 */
body.crimson .rank-row:hover { background: rgba(245, 63, 63, 0.05); }