:root {
  --ink: #020617;
  --text: #334155;
  --muted: #64748b;
  --blue: #2563eb;
  --blue-2: #1d4ed8;
  --blue-soft: #f8faff;
  --green: #059669;
  --green-soft: #f0fdf4;
  --line: rgba(15, 23, 42, 0.08);
  --line-soft: rgba(15, 23, 42, 0.04);
  --panel: rgba(255, 255, 255, 0.85);
  --bg: #fcfdff;

  /* Material Shadows - Inspired by physical objects */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.03);
  --shadow: 0 4px 12px -2px rgba(0, 0, 0, 0.04), 0 2px 6px -1px rgba(0, 0, 0, 0.02);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.03);
  --shadow-xl: 0 35px 60px -15px rgba(0, 0, 0, 0.1);
  /* Inner highlights for "3D" depth */
  --inner-glow: inset 0 1px 1px 0 rgba(255, 255, 255, 0.6);
  --inner-border: 1px solid rgba(255, 255, 255, 0.4);

  --radius: 18px;
  --font-mono: "JetBrains Mono", monospace;

  --ease: cubic-bezier(0.2, 0, 0.2, 1);
  --duration: 0.4s;
  --block-gap: 48px;
  --detail-block-gap: var(--block-gap);
  --faq-card-bg: #f8f9fa;

  /* 首页卡片 / 搜索 / pill 表面色 */
  --surface-elevated: #fff;
  --surface-inset: rgba(255, 255, 255, 0.5);
  --surface-inset-hover: #fff;
  --surface-input: transparent;
  --surface-tint-date: #f1f7ff;
  --surface-tint-math: #f0fdf4;
  --surface-tint-everyday: #faf5ff;
  --surface-converter-top: rgba(38, 100, 233, 0.2);
  --surface-converter-base: #fefefe;
  --surface-section-popular: linear-gradient(145deg, #eef5ff 0%, #ebe6ff 52%, #f7f5ff 100%);
  --pill-border: rgba(15, 23, 42, 0.04);

  /* 页脚：浅色模式浅底深字 */
  --footer-bg: #f8fafc;
  --footer-text: #020617;
  --footer-muted: #64748b;
  --footer-link-hover: #2563eb;
  --footer-divider: rgba(15, 23, 42, 0.08);
  --footer-separator: rgba(15, 23, 42, 0.18);

  /* 目录 / 分类 / 面包屑 */
  --breadcrumb-muted: #64748b;
  --breadcrumb-link: #2563eb;
  --breadcrumb-current: #334155;
  --category-panel-bg: linear-gradient(180deg, rgba(38, 100, 233, 0.2) 0%, rgba(38, 100, 233, 0) 100%), #fefefe;
  --table-row-alt: rgba(248, 250, 255, 0.65);
  --table-row-hover: rgba(37, 99, 235, 0.06);

  /* 计算器结果卡（与 --ink 文字色分离，避免 dark 下浅底白字） */
  --result-surface: #020617;
  --result-fg: #fff;
  --result-label: #3b82f6;
  --result-detail: #94a3b8;
  --result-border: rgba(255, 255, 255, 0.18);
  --result-copy-bg: rgba(255, 255, 255, 0.1);
  --result-copy-border: rgba(255, 255, 255, 0.2);
  --result-glow: rgba(59, 130, 246, 0.15);

  /* 顶栏语言 / 主题控件 */
  --header-control-bg: var(--surface-elevated);
  --header-control-fg: var(--ink);
  --header-control-icon: var(--muted);
}

* {
  box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

[hidden] {
  display: none !important;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 10% 20%, rgba(37, 99, 235, 0.03) 0%, transparent 40%),
    radial-gradient(circle at 90% 80%, rgba(16, 185, 129, 0.03) 0%, transparent 40%),
    var(--bg);
  background-attachment: fixed;
  font-family: Inter, -apple-system, sans-serif;
  line-height: 1.7;
  font-size: 15px;
  overflow-x: hidden;
}

/* The "Soul": Subtle Grain Texture Overlay */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
  opacity: 0.03;
  pointer-events: none;
  z-index: 9999;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(12px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-in {
  animation: fadeIn 0.8s var(--ease) both;
}

.stagger-1 {
  animation-delay: 0.1s;
}

.stagger-2 {
  animation-delay: 0.2s;
}

.stagger-3 {
  animation-delay: 0.3s;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all var(--duration) var(--ease);
}

p,
h1,
h2,
h3 {
  margin: 0;
}

h1 {
  font-size: clamp(40px, 6vw, 68px);
  line-height: 1.15;
  letter-spacing: -0.06em;
  font-weight: 900;
  color: var(--ink);
  background: linear-gradient(135deg, var(--ink) 0%, #1e293b 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  padding-bottom: 0.08em;
  overflow: visible;
}

h2 {
  font-size: 32px;
  line-height: 1.25;
  letter-spacing: -0.03em;
  font-weight: 850;
  color: var(--ink);
  padding-bottom: 0.04em;
  overflow: visible;
}

h3 {
  font-size: 20px;
  line-height: 1.35;
  font-weight: 750;
  color: var(--ink);
  overflow: visible;
}

p {
  color: var(--text);
  opacity: 0.85;
}

button,
input,
select {
  font: inherit;
}

.skip-link {
  position: absolute;
  left: -999px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.ref-wide {
  width: min(1200px, calc(100% - 48px));
  margin: 0 auto;
}

.site-header {
  height: 72px;
  border-bottom: 1px solid var(--line-soft);
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: background 0.3s;
}

.nav-wrap {
  height: 72px;
  display: flex;
  align-items: center;
  gap: 48px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  color: #fff;
  background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
  box-shadow: 0 8px 16px -4px rgba(37, 99, 235, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: transform 0.4s var(--ease);
}

.brand:hover .brand-mark {
  transform: rotate(-8deg) scale(1.1);
}

.brand strong {
  font-size: 20px;
  font-weight: 900;
  color: var(--ink);
  letter-spacing: -0.04em;
}

.brand small {
  display: block;
  color: var(--muted);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1 1 auto;
  min-width: 0;
}

.site-nav a {
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
  padding: 10px 18px;
  border-radius: 12px;
}

.site-nav a:hover {
  background: rgba(37, 99, 235, 0.06);
  color: var(--blue);
}

.site-nav a.is-active {
  color: var(--blue);
  background: rgba(37, 99, 235, 0.08);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  overflow: visible;
  flex-shrink: 0;
}

.theme-toggle,
.language-control {
  height: 44px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--header-control-bg);
  color: var(--header-control-fg);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}

.theme-toggle {
  transition: border-color var(--duration) var(--ease), background-color var(--duration) var(--ease), box-shadow var(--duration) var(--ease), transform var(--duration) var(--ease);
}

.theme-toggle:hover {
  border-color: var(--blue);
  background: var(--blue-soft);
  color: var(--blue);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.theme-toggle:hover .theme-toggle-icon {
  color: var(--blue);
}

.header-search {
  width: 320px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 16px;
  transition: all 0.3s var(--ease);
}

.header-search:focus-within {
  border-color: var(--blue);
  width: 420px;
  box-shadow: var(--shadow);
}

.header-search input {
  width: 100%;
  border: 0;
  outline: 0;
  font-size: 14px;
  color: var(--ink);
}

/* Hero Section */
.ref-home-main {
  position: relative;
  padding: 120px 0 100px;
  text-align: center;
  overflow: hidden;
}

.hero-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  max-width: none;
  height: clamp(480px, 56vw, 720px);
  pointer-events: none;
  z-index: 0;
  background-repeat: no-repeat;
  background-position: center top;
  background-size: cover;
}

.hero-backdrop--pc {
  display: block;
  background-image: url("/assets/hero-bg-pc.png");
}

.hero-backdrop--mobile {
  display: none;
  background-image: url("/assets/hero-bg-mobile.png");
}

html[data-theme='dark'] .hero-backdrop--pc {
  background-image: url("/assets/hero-bg-pc-dark.png");
}

html[data-theme='dark'] .hero-backdrop--mobile {
  background-image: url("/assets/hero-bg-mobile-dark.png");
}

.ref-home-main .hero-content {
  position: relative;
  z-index: 1;
}

.hero-headline-link {
  display: block;
  margin: 0 auto;
  max-width: 720px;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
  border-radius: 12px;
  transition: color 0.3s var(--ease);
}

.hero-headline-link:hover h1,
.hero-headline-link:focus-visible h1 {
  color: var(--blue);
  -webkit-text-fill-color: var(--blue);
}

.hero-headline-link:hover .hero-sub,
.hero-headline-link:focus-visible .hero-sub {
  color: var(--blue-2);
}

.hero-headline-link:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 6px;
}

.ref-home-main h1 {
  margin-bottom: 28px;
  /* 渐变字 + 负字距会在行末裁切笔画；Hero 用大号实色字避免 Tools 尾部被挡 */
  background: none;
  -webkit-background-clip: border-box;
  background-clip: border-box;
  -webkit-text-fill-color: var(--ink);
  color: var(--ink);
  padding-bottom: 0;
  padding-inline: 0.06em;
}

.hero-sub {
  font-size: 22px;
  color: var(--muted);
  max-width: 720px;
  margin: 0 auto 24px;
  line-height: 1.6;
  font-weight: 500;
}

.hero-search {
  width: 100%;
  max-width: 720px;
  height: 72px;
  display: flex;
  align-items: center;
  padding: 8px 8px 8px 32px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--surface-elevated);
  box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.08);
  margin: 0 auto;
  transition: all 0.4s var(--ease);
}

.hero-search:focus-within {
  transform: translateY(-4px);
  box-shadow: 0 30px 60px -12px rgba(0, 0, 0, 0.12);
  border-color: var(--blue);
}

.hero-search input {
  flex: 1;
  min-width: 0;
  border: 0;
  outline: 0;
  font-size: 20px;
  font-weight: 500;
  letter-spacing: -0.02em;
  background: var(--surface-input);
  color: var(--ink);
}

.hero-search input::placeholder {
  color: var(--muted);
  opacity: 1;
}

.hero-search button {
  height: 56px;
  padding: 0 40px;
  border: 0;
  border-radius: 16px;
  color: #fff;
  background: var(--blue);
  font-weight: 800;
  font-size: 16px;
  cursor: pointer;
  transition: all 0.3s var(--ease);
  box-shadow: 0 8px 16px -4px rgba(37, 99, 235, 0.4);
}

.hero-search button:hover {
  background: var(--blue-2);
  transform: scale(1.05);
}

/* Bento Grid - Breaking the Grid */
.home-cat-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 40px;
  margin-top: 100px;
}

/* 首页 Hero：搜索框上下间距一致（与下方区块小间距对齐） */
.ref-home-main .home-cat-grid--hero {
  margin-top: 24px;
}

.ref-home-main .ref-search-row {
  margin: 24px 0;
  margin-bottom: 40px;
}

.ref-home-main .ref-search-row+.home-cat-grid--hero {
  margin-top: 0;
}

/* 分类卡片与 Popular Converters 首块：略加大上间距，避免两块贴太近 */
.ref-home-main .ref-search-row+.home-section {
  margin-top: 72px;
}

.ref-home-main .hero-content>.home-section~.home-section {
  margin-top: 80px;
}

@media (min-width: 1025px) {
  .ref-home-main .hero-content {
    display: flex;
    flex-direction: column;
  }

  .ref-home-main .ref-search-row {
    order: 1;
  }

  .ref-home-main .home-cat-grid--hero {
    order: 2;
    margin-top: 0;
    margin-bottom: 16px;
  }

  .ref-home-main .popular-converters-section {
    margin-top: 72px;
  }

  .ref-home-main .hero-content>.home-section {
    order: 3;
  }

  .ref-home-main .hero-headline-link {
    max-width: min(1200px, 100%);
    overflow: visible;
  }
}

.home-cat {
  position: relative;
  isolation: isolate;
  grid-column: span 3;
  padding: 56px !important;
  background: var(--surface-elevated);
  border: var(--inner-border);
  border-radius: 36px !important;
  transition: all 0.5s var(--ease);
  box-shadow: var(--shadow), var(--inner-glow);
  display: flex;
  flex-direction: column;
  cursor: pointer;
}

/* 整卡跳转 All Calculators 对应区块；内部 tool-pill / View all 保持可单独点击 */
.home-cat-surface {
  position: absolute;
  inset: 0;
  z-index: 0;
  border-radius: inherit;
  pointer-events: auto;
}

.home-cat-surface:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 4px;
}

/* 非链接层穿透点击，落到 home-cat-surface */
.home-cat-head,
.home-cat-list {
  position: relative;
  z-index: 1;
  pointer-events: none;
}

.home-cat .tool-pill,
.home-cat .ref-link {
  position: relative;
  z-index: 1;
  pointer-events: auto;
}

.home-cat.date {
  grid-column: span 4;
  background: linear-gradient(165deg, var(--surface-elevated) 0%, var(--surface-tint-date) 100%);
  transform: rotate(-1.5deg);
}

.home-cat.math {
  grid-column: span 4;
  background: linear-gradient(165deg, var(--surface-elevated) 0%, var(--surface-tint-math) 100%);
  transform: translateY(24px);
}

.home-cat.everyday {
  grid-column: span 4;
  background: linear-gradient(165deg, var(--surface-elevated) 0%, var(--surface-tint-everyday) 100%);
  transform: rotate(1.5deg);
}

.home-cat:hover {
  transform: translateY(-12px) scale(1.03) rotate(0deg) !important;
  box-shadow: var(--shadow-xl);
  z-index: 10;
}

.cat-icon {
  width: 72px;
  height: 72px;
  border-radius: 20px;
  display: grid;
  place-items: center;
  font-size: 32px;
  margin-bottom: 36px;
  background: #fff;
  box-shadow: var(--shadow-sm);
  transition: transform 0.4s var(--ease);
}

/* 首页 Hero 三列分类：蓝底白图标，增强视觉重点 */
.home-cat .cat-icon {
  background: var(--blue);
  color: #fff;
  box-shadow: 0 10px 24px -8px rgba(37, 99, 235, 0.55);
}

.home-cat .cat-icon .icon {
  width: 36px;
  height: 36px;
}

/* Hero 分类卡图标：8px 内边距正方形，禁止被 flex 纵向拉长 */
.home-cat-grid--hero>.home-cat .cat-icon {
  width: auto;
  height: auto;
  min-width: 0;
  min-height: 0;
  padding: 8px;
  aspect-ratio: 1;
  box-sizing: border-box;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  border-radius: 16px;
}

.home-cat-grid--hero>.home-cat .cat-icon .icon {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.home-cat:hover .cat-icon {
  transform: scale(1.15) rotate(5deg);
}

/* PC：Hero 分类卡标题区（图标 + 小标题/说明）在卡顶与工具列表之间垂直居中 */
@media (min-width: 641px) {
  .home-cat-grid--hero>.home-cat {
    display: flex;
    flex-direction: column;
  }

  .home-cat-grid--hero>.home-cat .home-cat-head {
    display: flex;
    align-items: center;
    gap: 24px;
    flex: 1 1 auto;
    margin-bottom: 0;
    padding: 16px 0 24px;
  }

  .home-cat-grid--hero>.home-cat .home-cat-head .cat-icon {
    margin-bottom: 0;
    align-self: center;
  }

  .home-cat-grid--hero>.home-cat .home-cat-list {
    margin-top: 32px;
    flex-shrink: 0;
  }

  /* PC：大模块 split 标题行在大卡顶与内部小卡顶之间居中，整体高度略压低 */
  .wide-card.home-section>.home-section-head--split {
    margin-bottom: 32px;
    padding: 20px 0 28px;
    align-items: center;
  }
}

.home-cat h3 {
  font-size: 28px;
  margin-bottom: 14px;
  letter-spacing: -0.04em;
  color: var(--ink);
}

.home-cat p {
  font-size: 16px;
  color: var(--muted);
  line-height: 1.6;
  font-weight: 500;
}

.home-cat-list {
  margin-top: 40px;
  display: grid;
  gap: 14px;
}

.tool-pill {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background: var(--surface-inset);
  backdrop-filter: blur(8px);
  border-radius: 16px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  border: 1px solid var(--pill-border);
  transition: all 0.3s var(--ease);
}

.tool-pill:hover {
  border-color: var(--blue);
  background: var(--surface-inset-hover);
  color: var(--blue);
  transform: translateX(8px);
  box-shadow: var(--shadow-sm);
}

.green-icon,
.tiny-icon,
.big-blue-icon,
.result-icon,
.side-tool-icon,
.search-mark,
.breadcrumb-sep,
.section-icon,
.heading-icon {
  display: inline-grid;
  place-items: center;
  flex: 0 0 auto;
}

.green-icon {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  color: var(--green);
  background: var(--green-soft);
}

.tiny-icon,
.side-tool-icon {
  width: 32px;
  height: 32px;
  border-radius: 10px;
  color: var(--blue);
  background: var(--blue-soft);
}

.big-blue-icon,
.result-icon {
  width: 48px;
  height: 48px;
  border-radius: 16px;
  color: #fff;
  background: var(--blue);
}

.eyebrow {
  margin-bottom: 16px;
  color: var(--blue);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  opacity: 0.7;
}

.ref-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--blue);
  font-weight: 900;
  margin-top: 32px;
  font-size: 14px;
}

.ref-link:hover {
  color: var(--blue-2);
  transform: translateX(8px);
}

.share-button {
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface-elevated);
  color: var(--blue);
  font-weight: 800;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s var(--ease);
}

a.share-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 18px;
  text-decoration: none;
  white-space: nowrap;
}

.all-directory-page .category-title-row,
.converters-page .category-title-row {
  grid-template-columns: 1fr auto;
}

.share-button:hover {
  border-color: var(--blue);
  background: var(--blue-soft);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.home-section {
  margin-top: 140px;
  text-align: left;
}

.home-section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 40px;
  margin-bottom: 56px;
}

.home-section-head h2 {
  font-size: 48px;
  line-height: 1.15;
  letter-spacing: -0.04em;
  font-weight: 900;
}

.home-section-head p:last-child {
  max-width: 500px;
  color: var(--muted);
  text-align: right;
}

/* 首页模块标题：去 eyebrow，标题左、说明右，标题缩小约三分之一（与 Popular Converters 一致） */
.home-section-head--split {
  align-items: center;
  gap: 24px;
}

.home-section-head--split h2 {
  margin: 0;
  font-size: 32px;
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: -0.03em;
  white-space: nowrap;
  flex: 0 0 auto;
}

.home-section-head--split p:last-child {
  margin: 0;
  flex: 1 1 auto;
  max-width: none;
  text-align: right;
}

.home-section-head--split .home-section-view-all {
  margin: 0;
  flex: 1 1 auto;
  justify-content: flex-end;
  font-size: 15px;
  white-space: nowrap;
}

.popular-converters-section {
  background: var(--surface-section-popular);
}

.converter-feature-grid,
.classification-grid,
.home-guide-grid,
.quick-action-row {
  display: grid;
  gap: 18px;
}

.converter-feature-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.converter-feature-card,
.classification-main,
.quick-action-card {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 32px;
  border: var(--inner-border);
  box-shadow: var(--shadow), var(--inner-glow);
  transition: all 0.4s var(--ease);
}

/* Figma 12:495 — #FEFEFE + #2664E9 自上而下 20%→0% */
.converter-feature-card {
  border-radius: 34px;
  background:
    linear-gradient(180deg, var(--surface-converter-top) 0%, rgba(38, 100, 233, 0) 100%),
    var(--surface-converter-base);
}

.classification-main,
.quick-action-card {
  border-radius: 28px;
  background: var(--surface-elevated);
}

.converter-feature-card:hover,
.classification-main:hover,
.quick-action-card:hover {
  border-color: var(--blue);
  transform: translateY(-8px) scale(1.02);
  box-shadow: var(--shadow-lg);
}

.converter-feature-card span,
.classification-main span,
.quick-action-card span {
  min-width: 0;
}

.converter-feature-card strong,
.classification-main strong,
.quick-action-card strong {
  display: block;
  color: var(--ink);
  font-size: 15px;
}

.converter-feature-card small,
.classification-main small,
.quick-action-card span {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.classification-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  align-items: stretch;
}

.classification-card {
  min-width: 0;
}

.tools-classification-section .classification-card {
  display: flex;
  flex-direction: column;
  height: 100%;
  min-width: 0;
}

.tools-classification-section .classification-main {
  flex: 1 1 auto;
  height: 100%;
  min-height: 136px;
  align-items: center;
  align-self: stretch;
}

/* Tools Classification：方形蓝底白图标 */
.tools-classification-section .classification-main .cat-icon {
  flex-shrink: 0;
  width: 56px;
  height: 56px;
  margin: 0;
  border-radius: 16px;
  background: var(--blue);
  color: #fff;
  box-shadow: 0 8px 20px -8px rgba(37, 99, 235, 0.45);
}

.tools-classification-section .classification-main .cat-icon .icon {
  width: 28px;
  height: 28px;
}

.classification-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  padding: 0 4px;
}

.classification-tags span {
  max-width: 100%;
  padding: 0;
  border: 0;
  border-radius: 0;
  color: var(--muted);
  background: transparent;
  font-size: 12px;
  font-weight: 500;
  line-height: 1.5;
}

.why-use-home {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 420px;
  gap: 36px;
  align-items: center;
}

.why-use-copy p {
  margin: 14px 0 0;
}

.why-use-copy ul {
  margin: 22px 0 0;
  padding-left: 18px;
  color: var(--text);
}

.why-use-copy li {
  margin: 8px 0;
}

.why-use-visual {
  min-height: 280px;
  display: grid;
  gap: 14px;
  padding: 24px;
  border-radius: 28px;
  background:
    radial-gradient(circle at 20% 20%, rgba(59, 130, 246, 0.22), transparent 32%),
    linear-gradient(135deg, #0f172a 0%, #1d4ed8 100%);
  box-shadow: var(--shadow-xl);
}

.why-use-visual div {
  display: grid;
  gap: 4px;
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 16px;
  color: #fff;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
}

.home-guide-card {
  padding: 40px;
  border-radius: 32px;
  background: #fff;
  border: var(--inner-border);
  box-shadow: var(--shadow), var(--inner-glow);
  transition: all 0.4s var(--ease);
}

.home-guide-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-lg);
  border-color: var(--blue);
}

.why-use-visual span {
  color: #bfdbfe;
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.why-use-visual strong {
  font-size: 28px;
  line-height: 1.2;
}

.why-use-visual small {
  color: #dbeafe;
}

.home-guide-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  align-items: stretch;
}

.tools-guides-section .home-guide-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  height: 100%;
}

.tools-guides-section .home-guide-card>.guide-card-read {
  margin-top: auto;
  margin-bottom: 0;
}

.tools-guides-section .home-guide-card>.guide-tool {
  margin-top: 10px;
  max-width: 100%;
}

.home-guide-card,
.guide-list-card,
.content-card,
.contact-ref-card,
.legal-card,
.directory-reference-card {
  position: relative;
  isolation: isolate;
  min-width: 0;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface-elevated);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
}

.contact-form-card {
  max-width: 720px;
  margin: 0 auto;
  padding: 40px 40px 32px;
  cursor: default;
}

.contact-form-head {
  text-align: center;
  margin-bottom: 32px;
}

.contact-form-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  margin-bottom: 16px;
  border-radius: 14px;
  background: var(--blue-soft, #eff6ff);
  color: var(--blue);
}

.contact-form-icon .icon {
  width: 28px;
  height: 28px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.contact-form-head h2 {
  margin: 0 0 8px;
  font-size: 28px;
  font-weight: 800;
  color: var(--ink);
  letter-spacing: -0.02em;
}

.contact-form-head p {
  margin: 0;
  font-size: 15px;
  color: var(--muted);
  line-height: 1.5;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-form-row--split {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.contact-field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.contact-field-label {
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
}

.contact-required {
  color: var(--ink);
}

.contact-field input,
.contact-field select,
.contact-field textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  font-size: 15px;
  color: var(--ink);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.contact-field input,
.contact-field select {
  height: 48px;
  padding: 0 14px;
}

.contact-field select {
  appearance: none;
  padding-right: 40px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
}

.contact-field textarea {
  min-height: 160px;
  padding: 14px;
  resize: vertical;
  line-height: 1.5;
}

.contact-field input::placeholder,
.contact-field textarea::placeholder {
  color: #94a3b8;
}

.contact-field input:focus,
.contact-field select:focus,
.contact-field textarea:focus {
  border-color: var(--blue);
  outline: none;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.contact-submit {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  height: 52px;
  margin-top: 4px;
  border: 0;
  border-radius: 10px;
  background: var(--blue);
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
}

.contact-submit .icon {
  width: 18px;
  height: 18px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.contact-submit:hover {
  background: #1d4ed8;
}

.contact-submit:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
}

.contact-form-status {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
  text-align: center;
}

.contact-form-footnote {
  margin: 24px 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--line-soft);
  font-size: 14px;
  color: var(--muted);
  line-height: 1.6;
  text-align: center;
}

.contact-form-footnote a {
  color: var(--blue);
  text-decoration: underline;
  text-underline-offset: 2px;
}

html[data-theme='dark'] .contact-form-card,
html[data-theme='dark'] .contact-field input,
html[data-theme='dark'] .contact-field select,
html[data-theme='dark'] .contact-field textarea {
  background: var(--surface, #111827);
}

@media (max-width: 640px) {
  .contact-form-card {
    padding: 28px 20px 24px;
  }

  .contact-form-row--split {
    grid-template-columns: 1fr;
  }

  .contact-form-head h2 {
    font-size: 24px;
  }
}

/* 博客小卡整卡跳转文章；Related 计算器链接单独可点 */
.guide-card-surface {
  position: absolute;
  inset: 0;
  z-index: 0;
  border-radius: inherit;
  pointer-events: auto;
}

.guide-card-surface:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 4px;
}

.guide-list-card>p,
.guide-list-card>h2,
.guide-list-card>h3,
.guide-list-card>small,
.guide-list-card>.guide-card-read {
  position: relative;
  z-index: 1;
  pointer-events: none;
}

.guide-list-card .guide-tool {
  position: relative;
  z-index: 1;
  pointer-events: auto;
}

.home-guide-card p,
.guide-list-card p {
  color: var(--blue);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.home-guide-card h3,
.guide-list-card h2 {
  margin-top: 10px;
  font-size: 18px;
}

.home-guide-card small,
.guide-list-card small {
  display: block;
  margin: 12px 0 16px;
  color: var(--muted);
}

.guide-tool {
  display: inline-flex;
  margin-top: 10px;
  padding: 7px 10px;
  border-radius: 999px;
  color: var(--muted);
  background: var(--blue-soft);
  font-size: 12px;
  font-weight: 700;
}

.home-section-button {
  margin-top: 22px;
}

.faq-home-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.faq-home-grid details {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--bg);
}

.faq-home-grid summary {
  cursor: pointer;
  color: var(--ink);
  font-weight: 800;
}

.faq-home-grid p {
  margin-top: 10px;
  color: var(--muted);
}

.quick-action-row {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.quick-action-card {
  justify-content: space-between;
  min-height: 108px;
}

.quick-action-card strong {
  font-size: 20px;
}

.guide-grid-ref {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 0;
}

.guide-list-card--small {
  display: flex;
  flex-direction: column;
  min-height: 246px;
}

.guide-list-card--small .guide-card-read {
  margin-top: auto;
}

/* Result Panel - Modern Look */
.blue-result-card,
.result-panel {
  background: var(--result-surface);
  color: var(--result-fg);
  border-radius: 20px;
  padding: 32px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  display: flex;
  align-items: center;
  gap: 24px;
  border: 1px solid var(--result-border);
}

.blue-result-card::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at center, var(--result-glow) 0%, transparent 70%);
  pointer-events: none;
}

.result-panel strong,
.blue-result-card h2 {
  display: block;
  font-size: 36px;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--result-fg);
  letter-spacing: -0.02em;
  margin: 8px 0;
}

.result-panel span,
.blue-result-card p:first-child {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 700;
  color: var(--result-label);
}

.result-panel em,
.blue-result-card small {
  font-size: 14px;
  color: var(--result-detail);
  font-style: normal;
}

.copy-result {
  position: absolute;
  top: 24px;
  right: 24px;
  background: var(--result-copy-bg);
  border: 1px solid var(--result-copy-border);
  color: var(--result-fg);
  padding: 6px 16px;
  border-radius: 8px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  backdrop-filter: blur(4px);
}

.copy-result:hover {
  background: var(--blue);
  border-color: var(--blue);
}

/* Cards & Layout */
.wide-card,
.side-card,
.why-card,
.date-form-card,
.converter-form-card,
.matrix-column {
  background: var(--surface-elevated);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 32px;
  box-shadow: var(--shadow);
}

/* Figma 13:553 — 分类页大卡片渐变底，内部 .category-mini 使用 surface token */
.category-section {
  background: var(--category-panel-bg);
  border: 1px solid var(--line);
  border-radius: 34px;
  padding: 32px;
  box-shadow: var(--shadow);
}

.split-title h2 {
  font-size: 24px;
}

.button {
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 24px;
  border-radius: 12px;
  font-weight: 700;
  font-size: 14px;
  transition: all 0.2s;
  cursor: pointer;
  border: 1px solid var(--line);
  background: var(--surface-elevated);
}

.button.primary {
  background: var(--blue);
  color: #fff;
  border-color: var(--blue);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

.button.primary:hover {
  background: var(--blue-2);
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.3);
}

/* Responsive Adjustments */
@media (max-width: 768px) {
  .hero-backdrop--pc {
    display: none;
  }

  .hero-backdrop--mobile {
    display: block;
    height: clamp(520px, 72vw, 640px);
  }
}

@media (max-width: 1024px) {

  /* Hero 分类区：手机/平板横向滑动，避免纵向堆叠占屏 */
  .home-cat-grid--hero {
    display: flex;
    flex-wrap: nowrap;
    align-items: stretch;
    gap: 16px;
    margin-top: 56px;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    scroll-snap-type: x mandatory;
    scroll-padding-inline: 16px;
    overscroll-behavior-x: contain;
    margin-inline: -16px;
    padding-inline: 16px;
    padding-bottom: 10px;
    scrollbar-width: thin;
  }

  .home-cat-grid--hero>.home-cat {
    flex: 0 0 min(84vw, 300px);
    width: min(84vw, 300px);
    grid-column: unset !important;
    transform: none !important;
    scroll-snap-align: start;
    scroll-snap-stop: always;
    padding: 28px 24px !important;
  }

  .home-cat-grid--hero>.home-cat:hover {
    transform: translateY(-6px) scale(1.01) !important;
  }

  .home-cat-grid--hero>.home-cat .cat-icon {
    margin-bottom: 20px;
    align-self: flex-start;
  }

  .home-cat-grid--hero>.home-cat .home-cat-head {
    display: flex;
    align-items: flex-start;
    gap: 16px;
  }

  .home-cat-grid--hero>.home-cat .home-cat-head .cat-icon {
    align-self: center;
    flex-shrink: 0;
  }

  .home-cat-grid--hero>.home-cat-list {
    margin-top: 24px;
  }

  .home-cat-grid--hero>.home-cat h3 {
    font-size: 22px;
  }

  .home-cat-grid--hero>.home-cat.everyday {
    flex-direction: column;
    text-align: left;
  }

  .converter-feature-grid,
  .classification-grid,
  .home-guide-grid,
  .guide-grid-ref {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .why-use-home {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  :root {
    --block-gap: 40px;
  }

  .home-lower-grid {
    grid-template-columns: 1fr !important;
  }

  .home-lower-grid>* {
    grid-column: auto !important;
  }

  .home-section-head {
    display: block;
  }

  .home-section-head p:last-child {
    margin-top: 8px;
    text-align: left;
  }

  .home-section-head--split h2 {
    white-space: normal;
  }

  .home-section-head--split p:last-child {
    margin-top: 8px;
    text-align: left;
  }

  .converter-feature-grid,
  .classification-grid,
  .home-guide-grid,
  .faq-home-grid,
  .quick-action-row,
  .guide-grid-ref {
    grid-template-columns: 1fr;
  }

  .more-converters>div {
    grid-template-columns: 1fr;
  }

  .field-grid,
  .field-grid.three {
    grid-template-columns: 1fr;
  }

  .date-form-card,
  .converter-form-card,
  .blue-result-card {
    padding: 24px;
  }

  .why-use-visual {
    min-height: auto;
    padding: 18px;
  }

  .hero-search {
    height: auto;
    min-height: 64px;
    gap: 8px;
    padding: 8px 8px 8px 12px;
    border-radius: 20px;
  }

  .hero-search .search-mark {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
  }

  .hero-search input {
    flex: 1;
    min-width: 0;
    font-size: 15px;
  }

  .hero-search button {
    flex-shrink: 0;
    height: 48px;
    padding: 0 16px;
    font-size: 14px;
  }

  h1 {
    font-size: 36px;
  }

  .ref-home-main {
    padding: 40px 0;
  }

  .site-header .header-search {
    display: none;
  }

  /* Related / More Converters：面包屑下、标题上；横向滑动一行卡片 */
  .ref-detail-page .related-strip>h2,
  .ref-converter-page .related-strip>h2 {
    margin-bottom: 12px;
    font-size: 20px;
  }

  .ref-detail-page .related-strip-track,
  .ref-converter-page .related-strip-track {
    display: flex;
    flex-wrap: nowrap;
    gap: 12px;
    overflow-x: auto;
    overflow-y: hidden;
    padding-bottom: 6px;
    margin: 0 -4px;
    padding-left: 4px;
    padding-right: 4px;
    -webkit-overflow-scrolling: touch;
    scroll-snap-type: x proximity;
    scrollbar-width: thin;
  }

  .ref-detail-page .related-strip .related-card,
  .ref-converter-page .related-strip .related-card {
    flex: 0 0 min(78vw, 280px);
    scroll-snap-align: start;
    flex-direction: row;
    align-items: center;
    gap: 12px;
    padding: 16px 40px 16px 16px;
    position: relative;
  }

  .ref-detail-page .related-strip .related-card .big-blue-icon,
  .ref-converter-page .related-strip .related-card .big-blue-icon {
    flex-shrink: 0;
  }

  .ref-detail-page .related-strip .related-card>span:not(.big-blue-icon),
  .ref-converter-page .related-strip .related-card>span:not(.big-blue-icon) {
    flex: 1 1 auto;
    min-width: 0;
    overflow: hidden;
  }

  .ref-detail-page .related-strip .related-card strong,
  .ref-detail-page .related-strip .related-card small,
  .ref-converter-page .related-strip .related-card strong,
  .ref-converter-page .related-strip .related-card small {
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .ref-detail-page .related-strip .related-card em,
  .ref-converter-page .related-strip .related-card em {
    position: absolute;
    top: 50%;
    right: 14px;
    margin: 0;
    transform: translateY(-50%);
  }

  /* 转换器页：移动端用顶部横滑条，隐藏底部 2×2 网格 */
  .ref-converter-page .more-converters--desktop {
    display: none;
  }
}


/* Category page: reference image 2 */
.ref-category-page,
.ref-detail-page,
.ref-converter-page {
  padding: 18px 0 36px;
}

.ref-two-col {
  width: min(1200px, calc(100% - 48px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 48px;
  align-items: start;
}

.ref-main-col {
  min-width: 0;
}

/* 主内容栏：相邻模块块间距约 40~60px（详情 / 分类 / 转换器 / 目录） */
.ref-detail-page .ref-main-col,
.ref-converter-page .ref-main-col,
.ref-category-page .ref-main-col,
.page-shell--detail .ref-main-col,
.page-shell--converter .ref-main-col,
.page-shell--category .ref-main-col {
  display: flex;
  flex-direction: column;
  row-gap: var(--block-gap);
}

/* row-gap 已负责模块间距，避免 margin 叠加或覆盖 */
.ref-detail-page .ref-main-col>*,
.ref-converter-page .ref-main-col>*,
.ref-category-page .ref-main-col>*,
.page-shell--detail .ref-main-col>*,
.page-shell--converter .ref-main-col>*,
.page-shell--category .ref-main-col>* {
  margin-top: 0;
}

/* 标题区：主标题与副标题保持紧凑（抵消 row-gap） */
.ref-detail-page .ref-main-col>.detail-sub,
.ref-converter-page .ref-main-col>.detail-sub {
  margin-top: calc(12px - var(--block-gap));
}

.ref-detail-page .ref-main-col>h1,
.ref-converter-page .ref-main-col>h1 {
  margin: 0;
  font-size: 32px;
  letter-spacing: -0.03em;
  line-height: 1.2;
}

.ref-detail-page .ref-main-col>.detail-sub,
.ref-converter-page .ref-main-col>.detail-sub {
  margin-bottom: 0;
  max-width: 720px;
  font-size: 15px;
  line-height: 1.65;
  color: var(--text);
}

.ref-detail-page .ref-main-col>section>h2,
.ref-converter-page .ref-main-col>section>h2,
.ref-category-page .ref-main-col>section>h2 {
  margin: 0 0 20px;
}

/* 日期详情：表单 + 结果黑卡略紧（抵消 row-gap） */
.ref-detail-page .ref-main-col>.blue-result-card {
  margin-top: calc(24px - var(--block-gap));
}

.ref-page-hero h1,
.guides-hero h1,
.article-hero h1 {
  line-height: 1.2;
  padding-bottom: 0.08em;
}

.ref-page-hero p,
.guides-hero p,
.article-hero p {
  line-height: 1.65;
}

.page-shell--article .ref-main-col,
.page-shell--guides .page-frame,
.page-shell--content .page-frame {
  display: flex;
  flex-direction: column;
  row-gap: var(--block-gap);
}

.page-shell--article .ref-main-col>*,
.page-shell--guides .page-frame>*,
.page-shell--content .page-frame>* {
  margin-top: 0;
}

.ref-main-col>.breadcrumb,
.page-shell--guides .page-frame>.breadcrumb,
.page-shell--content .page-frame>.breadcrumb {
  margin: 0;
}

.more-converters>h2,
.related-strip>h2,
.converter-content-grid>section>h2,
.calc-copy>h2 {
  margin: 0 0 20px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 4px 0 10px;
  color: var(--breadcrumb-muted);
  font-size: 13px;
}

.breadcrumb a {
  color: var(--breadcrumb-link);
}

.breadcrumb strong {
  color: var(--breadcrumb-current);
  font-weight: 500;
}

.category-title-row {
  display: grid;
  grid-template-columns: 1fr 90px;
  gap: 20px;
  align-items: start;
  margin-bottom: 0;
}

.category-title-row h1 {
  font-size: 32px;
  line-height: 1.2;
}

.category-title-row p {
  max-width: 680px;
  margin-top: 5px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--text);
}

/* Shared Page Components */
.page-shell {
  padding: 40px 0 80px;
}

.page-frame {
  width: min(1200px, calc(100% - 48px));
  margin: 0 auto;
}

.page-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 48px;
  align-items: start;
}

/* Category Styles */
.category-section {
  margin-bottom: 0;
  scroll-margin-top: 96px;
}

.category-section-head {
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--line-soft);
}

.category-section h2 {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-size: 24px;
}

.category-section h2 b {
  font-size: 12px;
  background: var(--blue-soft);
  color: var(--blue);
  padding: 2px 10px;
  border-radius: 999px;
}

.category-mini-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}

.category-section .category-mini {
  padding: 20px;
  background: var(--surface-elevated);
  border: 1px solid var(--line);
  border-radius: 16px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: all 0.2s;
  box-shadow: var(--shadow-sm);
}

.category-mini:hover {
  border-color: var(--blue);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.category-mini strong {
  font-size: 15px;
  color: var(--ink);
}

.category-mini small {
  font-size: 12px;
  color: var(--muted);
}

.why-card h2 {
  margin-bottom: 10px;
}

.why-card>p {
  max-width: 760px;
  color: var(--text);
  line-height: 1.65;
}

.why-card>div {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-top: 22px;
}

.why-card>div>span {
  display: grid;
  gap: 4px;
  padding: 16px;
  border: 1px solid var(--line-soft);
  border-radius: 16px;
  background: var(--soft);
}

.why-card>div>span .icon {
  color: var(--blue);
}

.why-card>div>span b {
  display: block;
  color: var(--ink);
}

.why-card>div>span small {
  display: block;
  color: var(--muted);
}

@media (max-width: 1024px) {
  .why-card>div {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .why-card>div {
    grid-template-columns: 1fr;
  }
}

.more-converters {
  margin-top: 0;
}

.more-converters>div,
.related-strip-track,
.converter-content-grid,
.directory-reference-grid,
.content-card-grid {
  display: grid;
  gap: 16px;
}

.more-converters>div {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.related-strip-track {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

/* 桌面端：Related 仍在说明文案之后（DOM 在面包屑后，用 order 还原） */
@media (min-width: 641px) {
  .ref-detail-page .ref-main-col>.breadcrumb {
    order: 0;
  }

  .ref-detail-page .ref-main-col>h1 {
    order: 1;
  }

  .ref-detail-page .ref-main-col>.detail-sub {
    order: 2;
  }

  .ref-detail-page .ref-main-col>.sr-only {
    order: 3;
  }

  .ref-detail-page .ref-main-col>.date-form-card {
    order: 4;
  }

  .ref-detail-page .ref-main-col>.blue-result-card {
    order: 5;
  }

  .ref-detail-page .ref-main-col>.calc-copy {
    order: 6;
  }

  .ref-detail-page .ref-main-col>.related-strip {
    order: 7;
  }

  .ref-detail-page .ref-main-col>.info-note {
    order: 8;
  }
}

/* 转换器页：桌面端隐藏顶部横滑条，保留底部 More Converters 网格 */
@media (min-width: 641px) {
  .ref-converter-page .more-converters-strip {
    display: none;
  }
}

.converter-content-grid {
  grid-template-columns: minmax(0, 1fr) 260px;
  margin-top: 0;
}

/* 转换器详情：Supported Units 表格展示 */
.conversion-table {
  min-width: 0;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--surface-elevated);
  box-shadow: var(--shadow-sm);
}

.conversion-table>h2 {
  margin: 0 0 20px;
  font-size: 22px;
  letter-spacing: -0.02em;
}

.conversion-table .table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--line);
  border-radius: 12px;
}

.conversion-table table {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  border-spacing: 0;
  table-layout: auto;
}

.conversion-table thead {
  background: var(--blue-soft);
}

.conversion-table th,
.conversion-table td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--line-soft);
  font-size: 14px;
  line-height: 1.45;
  vertical-align: middle;
}

.conversion-table th {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.conversion-table tbody tr:last-child td {
  border-bottom: 0;
}

.conversion-table tbody tr:nth-child(even) td {
  background: var(--table-row-alt);
}

.conversion-table tbody tr:hover td {
  background: var(--table-row-hover);
}

.conversion-table td:nth-child(2) {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--ink);
}

.conversion-table td:nth-child(4) {
  font-weight: 700;
  color: var(--green);
}

/* 转换器详情底部：About 等模块纵向间距 */
.converter-bottom-grid {
  display: flex;
  flex-direction: column;
  row-gap: var(--block-gap);
}

.converter-bottom-grid>section {
  margin-top: 0;
}

.directory-reference-grid,
.content-card-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 0;
}

.more-card,
.related-card,
.reference-row {
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface-elevated);
}

.more-card:hover,
.related-card:hover,
.reference-row:hover {
  border-color: var(--blue);
  color: var(--blue);
  box-shadow: var(--shadow);
}

.more-card span,
.related-card span,
.reference-row span {
  min-width: 0;
}

.more-card strong,
.related-card strong,
.reference-row strong {
  display: block;
  color: var(--ink);
}

.more-card small,
.related-card small {
  display: block;
  color: var(--muted);
  font-size: 12px;
}

/* Sidebar */
.ref-sidebar {
  display: grid;
  gap: 24px;
}

.side-card {
  padding: 28px;
  background: var(--surface-elevated);
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: var(--shadow-sm);
}

.side-card h2 {
  font-size: 18px;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.side-list {
  display: grid;
  gap: 4px;
}

.side-list a {
  padding: 10px 14px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 10px;
  text-align: left;
}

/* 带右侧箭头的侧栏链接仍两端对齐 */
.side-list a:has(em) {
  justify-content: space-between;
}

.side-list a:hover {
  background: var(--blue-soft);
  color: var(--blue);
}

/* 转换器详情侧边栏：全宽按钮 + 当前项蓝底高亮 */
.converter-cats {
  display: grid;
  gap: 6px;
}

.converter-cats a {
  width: 100%;
  min-width: 0;
  padding: 10px 14px;
  border-radius: 12px;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  border: 1px solid transparent;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  transition: background 0.2s, color 0.2s, border-color 0.2s, box-shadow 0.2s;
}

.converter-cats a:hover {
  background: var(--blue-soft);
  color: var(--blue);
}

.converter-cats a.active {
  background: var(--blue);
  color: #fff;
  font-weight: 700;
  border-color: var(--blue);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.18);
}

.converter-cats a.active:hover {
  background: var(--blue-2);
  color: #fff;
}

.converter-cats a:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

/* Calculator Forms */
.date-form-card,
.converter-form-card {
  padding: 40px;
}

.field-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-bottom: 24px;
}

.field-grid.three {
  grid-template-columns: repeat(3, 1fr);
}

/* 转换器：上行 Value + From + 交换按钮，下行 To */
.converter-fields.field-grid.three {
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) 48px;
  grid-template-rows: auto auto;
}

.converter-fields>label:nth-child(1) {
  grid-column: 1;
  grid-row: 1;
}

.converter-fields>label:nth-child(2) {
  grid-column: 2;
  grid-row: 1;
}

.converter-fields>.swap-button {
  grid-column: 3;
  grid-row: 1;
  align-self: center;
  justify-self: center;
}

.converter-fields>label:nth-child(4) {
  grid-column: 1;
  grid-row: 2;
}

.calculator-card label {
  display: block;
  margin-bottom: 8px;
  font-size: 13px;
  font-weight: 700;
  color: var(--ink);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.calculator-card input,
.calculator-card select {
  width: 100%;
  height: 48px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface-elevated);
  font-size: 15px;
  color: var(--ink);
  transition: border-color 0.2s;
}

.calculator-card input:focus,
.calculator-card select:focus {
  border-color: var(--blue);
  outline: 0;
  ring: 3px solid var(--blue-soft);
}

.calc-action-row {
  display: flex;
  gap: 16px;
  padding-top: 32px;
  border-top: 1px solid var(--line-soft);
  margin-top: 8px;
}

/* Article & Typography */
.article-content {
  font-size: 17px;
  line-height: 1.8;
  color: var(--text);
}

.article-content h2 {
  font-size: 28px;
  margin: 40px 0 20px;
}

.article-content h3 {
  font-size: 22px;
  margin: 32px 0 16px;
}

.article-content p {
  margin-bottom: 24px;
}

.article-content a {
  color: var(--blue);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(37, 99, 235, 0.4);
}

.article-content a:hover {
  color: var(--blue-2);
  text-decoration-color: var(--blue-2);
}

.article-content a:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
  border-radius: 2px;
}

.article-content ul {
  padding-left: 24px;
  margin-bottom: 24px;
}

.article-content li {
  margin-bottom: 12px;
}

.blog-article-body img,
.article-content img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  margin: 32px 0;
  border-radius: 12px;
}

/* Blog FAQ — static card list (no accordion) */
.blog-article-body .blog-faq {
  margin-top: 48px;
  margin-bottom: 20px;
}

.blog-article-body .blog-faq-title {
  font-size: 24px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--ink);
  margin: 0 0 16px;
}

.blog-article-body .blog-faq-divider {
  display: block;
  width: 100%;
  height: 1px;
  margin: 0 0 24px;
  background: var(--line);
  border: 0;
}

.blog-article-body .blog-faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.blog-article-body .blog-faq-item {
  margin: 0;
  padding: 20px 24px;
  background: var(--faq-card-bg);
  border: 1px solid var(--line-soft);
  border-radius: 10px;
}

.blog-article-body .blog-faq-q {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink);
  margin: 0 0 8px;
}

.blog-article-body .blog-faq-a {
  font-size: 16px;
  font-weight: 400;
  line-height: 1.6;
  color: var(--text);
  margin: 0;
}

html[data-theme="dark"] .blog-article-body .blog-faq-item {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(255, 255, 255, 0.08);
}

html[data-theme="dark"] .blog-article-body .blog-faq-divider {
  background: rgba(255, 255, 255, 0.1);
}

.note-box {
  padding: 24px;
  background: var(--blue-soft);
  border-left: 4px solid var(--blue);
  border-radius: 0 12px 12px 0;
  margin: 32px 0;
  font-style: italic;
}

/* Footer */
.site-footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  border-top: 1px solid var(--footer-divider);
  padding: 80px 0 40px;
  margin-top: 80px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 60px;
  margin-bottom: 60px;
}

.footer-links {
  display: grid;
  gap: 12px;
}

.footer-links strong {
  color: var(--footer-text);
  font-size: 16px;
  margin-bottom: 12px;
  display: block;
}

.footer-links a {
  color: var(--footer-muted);
  font-size: 14px;
}

.footer-links a:hover {
  color: var(--footer-link-hover);
}

.footer-copy {
  text-align: center;
  padding-top: 40px;
  border-top: 1px solid var(--footer-divider);
  color: var(--footer-muted);
  font-size: 13px;
}

/* 覆盖页脚 tagline 内联 color: var(--muted) */
.site-footer .footer-grid>div:first-child p {
  color: var(--footer-muted) !important;
}

/* Footer 品牌区：图标不被挤压 */
.site-footer .brand strong {
  color: var(--footer-text);
}

.site-footer .brand small {
  color: var(--footer-muted);
}

.site-footer .brand-mark {
  flex: 0 0 40px;
  flex-shrink: 0;
  width: 40px;
  height: 40px;
}

.site-footer .brand-mark .icon {
  width: 22px;
  height: 22px;
}

.site-footer .brand:hover .brand-mark {
  transform: none;
}

/* Mobile & Global Guardrails */
@media (max-width: 900px) {
  .page-grid {
    grid-template-columns: 1fr;
  }

  .ref-two-col {
    width: calc(100% - 32px);
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

  .page-frame {
    width: calc(100% - 32px);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }

  .footer-grid>div:first-child {
    grid-column: 1 / -1;
    min-width: 0;
    overflow: visible;
  }

  .site-footer .brand {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    max-width: 100%;
  }

  .site-footer .brand>span:last-child {
    min-width: 0;
    flex: 1 1 auto;
  }

  .site-footer .brand small {
    white-space: normal;
    word-break: break-word;
  }

  /* Footer 链接：标题单独一行，条目横向排列并用竖线分隔 */
  .footer-links {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    row-gap: 8px;
    column-gap: 0;
  }

  .footer-links strong {
    flex: 0 0 100%;
    width: 100%;
    margin-bottom: 4px;
  }

  .footer-links a {
    display: inline-flex;
    align-items: center;
    font-size: 13px;
    flex: 0 1 auto;
    min-width: 0;
  }

  .footer-links a+a::before {
    content: "|";
    margin: 0 0.5em;
    color: var(--footer-separator);
    font-weight: 400;
    pointer-events: none;
  }

  .ref-wide {
    width: calc(100% - 32px);
  }

  .site-header .nav-wrap {
    width: 100%;
    justify-content: space-between;
    gap: 12px;
    padding: 0 16px;
  }

  .site-header .brand {
    flex: 0 1 auto;
    min-width: 0;
  }

  .site-header .mobile-nav-toggle {
    flex: 0 0 auto;
    margin-left: 0;
  }

  .site-nav {
    display: none;
  }

  .header-actions {
    display: none;
  }

  .converter-content-grid,
  .directory-reference-grid,
  .content-card-grid {
    grid-template-columns: 1fr;
  }
}

.icon {
  width: 1em;
  height: 1em;
  stroke-width: 2.5;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.icon-inline {
  width: 14px;
  height: 14px;
  vertical-align: -2px;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg);
}

::-webkit-scrollbar-thumb {
  background: var(--line);
  border-radius: 10px;
  border: 2px solid var(--bg);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--muted);
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.home-cat,
.wide-card,
.side-card,
.category-mini,
.detail-page h1 {
  animation: fadeIn 0.5s ease out both;
}

.home-cat:nth-child(1) {
  animation-delay: 0.1s;
}

.home-cat:nth-child(2) {
  animation-delay: 0.2s;
}

.home-cat:nth-child(3) {
  animation-delay: 0.3s;
}

.home-cat:nth-child(4) {
  animation-delay: 0.4s;
}

/* Interactive Hover Glow */
.tool-pill:hover,
.category-mini:hover {
  box-shadow: 0 0 20px rgba(37, 99, 235, 0.1);
}

/* Form Polish */
.calculator-card input,
.calculator-card select {
  box-shadow: inset 0 2px 4px 0 rgba(0, 0, 0, 0.05);
}

.calculator-card input:focus {
  background: var(--surface-elevated);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

/* Result Hero Polish */
.blue-result-card h2,
.result-panel strong {
  text-shadow: 0 0 30px rgba(59, 130, 246, 0.3);
}

/* Breadcrumb Polish */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
}

.breadcrumb a {
  color: var(--blue);
}

.breadcrumb a:hover {
  text-decoration: underline;
}

/* High Contrast Adjustments — 见 html[data-theme='dark'] 内 --result-* token */

/* Fixes for UI Glitches */
.calculator-card input[type="checkbox"],
.calculator-card input[type="radio"] {
  width: 20px;
  height: 20px;
  padding: 0;
  border-radius: 4px;
}

.check-row {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  font-weight: 500;
  text-transform: none;
  letter-spacing: normal;
}

.check-row input {
  margin: 0;
}

/* Fix mobile nav visibility */
.mobile-nav-toggle,
.mobile-nav-panel {
  display: none;
}

@media (max-width: 900px) {
  .mobile-nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    padding: 0;
    margin: 0;
    border: 1px solid rgba(15, 23, 42, 0.1);
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.96);
    box-shadow: var(--shadow-sm), var(--inner-glow);
    cursor: pointer;
    position: relative;
    z-index: 10;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease), background 0.2s var(--ease);
  }

  .mobile-nav-toggle:hover {
    border-color: rgba(37, 99, 235, 0.22);
    background: #fff;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.1);
  }

  .mobile-nav-toggle:active {
    transform: scale(0.97);
  }

  .mobile-nav-toggle:focus-visible {
    outline: 2px solid var(--blue);
    outline-offset: 2px;
  }

  .mobile-nav-toggle-icon {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    width: 18px;
    height: 14px;
    pointer-events: none;
  }

  .mobile-nav-toggle-icon span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--ink);
    border-radius: 999px;
    transition: transform 0.22s var(--ease), opacity 0.18s var(--ease);
    transform-origin: center;
  }

  .mobile-nav-toggle[aria-expanded='true'] .mobile-nav-toggle-icon span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }

  .mobile-nav-toggle[aria-expanded='true'] .mobile-nav-toggle-icon span:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
  }

  .mobile-nav-toggle[aria-expanded='true'] .mobile-nav-toggle-icon span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }

  html[data-theme='dark'] .mobile-nav-toggle {
    background: rgba(30, 41, 59, 0.92);
    border-color: rgba(148, 163, 184, 0.2);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.25);
  }

  html[data-theme='dark'] .mobile-nav-toggle-icon span {
    background: #f1f5f9;
  }

  .mobile-nav-panel {
    position: fixed;
    inset: 0;
    width: 100vw;
    height: 100vh;
    z-index: 1200;
  }

  html.mobile-nav-open .mobile-nav-panel {
    display: block;
  }

  .mobile-nav-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
  }

  .mobile-nav-drawer {
    position: absolute;
    top: 0;
    right: 0;
    width: min(300px, 100vw);
    max-width: 100%;
    height: 100vh;
    height: 100dvh;
    max-height: 100dvh;
    background: var(--bg);
    border-left: 1px solid var(--line);
    padding: 24px;
    padding-bottom: max(24px, env(safe-area-inset-bottom));
    display: flex;
    flex-direction: column;
    gap: 24px;
    overflow-y: auto;
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
  }

  .mobile-nav-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .mobile-nav-close {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    font-size: 22px;
    line-height: 1;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: var(--header-control-bg);
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    color: var(--header-control-fg);
    transition: border-color 0.2s, background 0.2s, color 0.2s;
  }

  .mobile-nav-close:hover {
    border-color: rgba(37, 99, 235, 0.22);
    background: var(--blue-soft);
    color: var(--header-control-fg);
  }

  html[data-theme='dark'] .mobile-nav-close {
    background: var(--surface-input);
    color: var(--ink);
    border-color: var(--line);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.35);
  }

  html[data-theme='dark'] .mobile-nav-close:hover {
    background: var(--surface-inset-hover);
    border-color: rgba(96, 165, 250, 0.35);
  }

  .mobile-nav-close:focus-visible {
    outline: 2px solid var(--blue);
    outline-offset: 2px;
  }

  .mobile-nav-links {
    display: flex;
    flex-direction: column;
    gap: 16px;
  }

  .mobile-nav-link {
    font-size: 16px;
    font-weight: 600;
    color: var(--ink);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    border-radius: 8px;
    border: 1px solid var(--line-soft);
    background: var(--panel);
  }

  .mobile-nav-link::after {
    content: "›";
    font-size: 18px;
    color: var(--muted);
  }

  .mobile-display-controls {
    display: grid;
    gap: 12px;
    margin-top: 0;
    flex-shrink: 0;
  }

  /* 移动端：语言列表在抽屉内展开，可随整页菜单滚动 */
  .mobile-display-controls .language-control {
    position: relative;
    display: block;
    width: 100%;
    min-width: 0;
    min-height: 48px;
    height: auto;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: var(--header-control-bg);
    overflow: visible;
    contain: none;
  }

  .mobile-display-controls .language-control.is-open {
    z-index: 1;
    display: flex;
    flex-direction: column;
    gap: 8px;
    min-height: 0;
  }

  .mobile-display-controls .language-control.is-open .language-control__trigger {
    position: relative;
    inset: auto;
    flex: 0 0 48px;
    width: 100%;
    height: 48px;
    border-radius: 10px;
    background: transparent;
  }

  .mobile-display-controls .language-menu {
    position: static;
    top: auto;
    left: auto;
    right: auto;
    margin-top: 0;
    width: 100%;
    max-height: none;
    overflow: visible;
  }

  .mobile-display-controls .mobile-control.theme-toggle {
    width: 100%;
    justify-content: center;
  }
}

/* Fix header control labels */
.language-control,
.theme-toggle {
  text-transform: none;
  letter-spacing: normal;
  margin: 0;
  display: inline-flex;
}

.header-actions .language-control,
.header-actions .theme-toggle {
  margin-bottom: 0;
}

.header-actions .language-control {
  width: 9.5rem;
  min-width: 9.5rem;
  flex: 0 0 9.5rem;
}

.header-actions .theme-toggle {
  flex: 0 0 auto;
  flex-shrink: 0;
  min-width: 6.75rem;
  white-space: nowrap;
}

.header-actions .theme-toggle>span[data-i18n] {
  flex-shrink: 0;
}

.related-card,
.more-card,
.converter-feature-card,
.category-mini {
  justify-content: flex-start;
}

/* 语言选择：自定义圆角菜单（原生 select 下拉无法统一样式） */
.language-control {
  position: relative;
  min-width: 8.75rem;
  padding: 0;
  justify-content: stretch;
  overflow: visible;
  z-index: 1;
  contain: layout style;
}

/* 首屏即隐藏原生 select，避免 nav.js 初始化前或切换时闪出系统下拉 */
.language-control>select[data-language-select] {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
}

.language-control.is-open {
  z-index: 1100;
}

.language-control>.icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  pointer-events: none;
  z-index: 2;
  color: var(--header-control-icon);
}

.language-control__native {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
}

.language-control__trigger {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0 2rem 0 2.5rem;
  border: 0;
  outline: 0;
  border-radius: inherit;
  background-color: transparent;
  -webkit-tap-highlight-color: transparent;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 12px;
  color: var(--header-control-fg);
  font: inherit;
  font-weight: 800;
  text-align: left;
  cursor: pointer;
  z-index: 1;
}

.language-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  min-width: 100%;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface-elevated);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  gap: 6px;
  z-index: 2;
}

.language-menu__item {
  display: block;
  width: 100%;
  margin: 0;
  padding: 12px 14px;
  border: 0;
  border-radius: 10px;
  background: transparent;
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.35;
  text-align: left;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.language-menu__item:hover,
.language-menu__item.is-selected {
  background: var(--blue-soft);
  color: var(--blue);
}

.mobile-display-controls .language-control {
  width: 100%;
  min-width: 0;
}

.hero-search input,
.header-search input {
  height: 100%;
}

.date-side a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  min-width: 0;
  overflow: hidden;
  text-align: left;
}

.date-side .side-link-leading {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  flex: 1 1 auto;
}

.date-side .side-link-label {
  min-width: 0;
  text-align: left;
  overflow: hidden;
  text-overflow: ellipsis;
}

.date-side a .side-tool-icon {
  flex: 0 0 32px;
}

.date-side a em {
  flex: 0 0 auto;
  align-self: center;
}

.swap-button {
  margin-top: 10px;
  width: 48px;
  height: 48px;
  min-height: 0;
  padding: 0;
  border-radius: 12px;
}

.related-card>span:not(.big-blue-icon),
.more-card>span:not(.green-icon),
.converter-feature-card>span:not(.green-icon),
.category-mini>span:not(.tiny-icon) {
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
}

.category-mini>span:not(.tiny-icon) {
  display: grid;
  gap: 4px;
}

.related-card strong,
.related-card small,
.more-card strong,
.more-card small,
.converter-feature-card strong,
.converter-feature-card small,
.category-mini strong,
.category-mini small {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
}

@media (max-width: 640px) {

  .field-grid,
  .field-grid.three {
    grid-template-columns: 1fr;
  }

  .converter-fields.field-grid.three {
    grid-template-columns: 1fr;
    grid-template-rows: auto;
  }

  .converter-fields>label:nth-child(1),
  .converter-fields>label:nth-child(2),
  .converter-fields>.swap-button,
  .converter-fields>label:nth-child(4) {
    grid-column: 1;
    grid-row: auto;
  }

  .converter-fields>.swap-button {
    justify-self: start;
    align-self: center;
  }

  .date-form-card,
  .converter-form-card,
  .blue-result-card,
  .result-panel {
    padding: 20px;
  }

  /* 结果卡：移动端网格排版，Copy 与文案不重叠 */
  .result-panel {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-areas:
      "label copy"
      "value value"
      "detail detail";
    align-items: center;
    gap: 10px 12px;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    overflow: visible;
  }

  .result-panel>span {
    grid-area: label;
    margin: 0;
  }

  .result-panel>.copy-result {
    position: static;
    grid-area: copy;
    justify-self: end;
    align-self: center;
    flex-shrink: 0;
    white-space: nowrap;
  }

  .result-panel>strong {
    grid-area: value;
    font-size: clamp(22px, 7vw, 30px);
    margin: 0;
    word-break: break-word;
    overflow-wrap: anywhere;
    line-height: 1.2;
  }

  .result-panel>em {
    grid-area: detail;
    display: block;
    margin: 0;
    font-size: 13px;
    line-height: 1.45;
    word-break: break-word;
    overflow-wrap: anywhere;
    color: var(--result-detail);
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .site-footer {
    padding: 48px 0 32px;
    margin-top: 48px;
  }

  .calc-action-row {
    flex-wrap: wrap;
  }
}

/* Dark theme */
html[data-theme='dark'] {
  color-scheme: dark;
  --ink: #f1f5f9;
  --text: #cbd5e1;
  --muted: #94a3b8;
  --blue-soft: rgba(37, 99, 235, 0.18);
  --green-soft: rgba(5, 150, 105, 0.15);
  --line: rgba(148, 163, 184, 0.18);
  --line-soft: rgba(148, 163, 184, 0.1);
  --panel: rgba(30, 41, 59, 0.92);
  --bg: #0f172a;
  --faq-card-bg: rgba(30, 41, 59, 0.6);

  --surface-elevated: #1e293b;
  --surface-inset: rgba(15, 23, 42, 0.55);
  --surface-inset-hover: rgba(30, 41, 59, 0.95);
  --surface-input: #0f172a;
  --surface-tint-date: rgba(37, 99, 235, 0.14);
  --surface-tint-math: rgba(5, 150, 105, 0.14);
  --surface-tint-everyday: rgba(139, 92, 246, 0.14);
  --surface-converter-top: rgba(37, 99, 235, 0.22);
  --surface-converter-base: #1e293b;
  --surface-section-popular: linear-gradient(145deg, #1e293b 0%, rgba(37, 99, 235, 0.1) 52%, #172033 100%);
  --pill-border: rgba(148, 163, 184, 0.16);
  --inner-border: 1px solid rgba(148, 163, 184, 0.12);
  --inner-glow: inset 0 1px 1px 0 rgba(255, 255, 255, 0.04);

  --footer-bg: #020617;
  --footer-text: #f1f5f9;
  --footer-muted: #94a3b8;
  --footer-link-hover: #93c5fd;
  --footer-divider: rgba(148, 163, 184, 0.14);
  --footer-separator: rgba(255, 255, 255, 0.28);

  --breadcrumb-muted: #94a3b8;
  --breadcrumb-link: #60a5fa;
  --breadcrumb-current: #e2e8f0;
  --category-panel-bg: linear-gradient(180deg, rgba(37, 99, 235, 0.22) 0%, rgba(37, 99, 235, 0) 100%), #1e293b;
  --table-row-alt: rgba(15, 23, 42, 0.55);
  --table-row-hover: rgba(37, 99, 235, 0.12);

  --result-surface: linear-gradient(145deg, #1e3a8a 0%, #1e293b 52%, #0f172a 100%);
  --result-fg: #f8fafc;
  --result-label: #60a5fa;
  --result-detail: #94a3b8;
  --result-border: rgba(96, 165, 250, 0.22);
  --result-copy-bg: rgba(255, 255, 255, 0.08);
  --result-copy-border: rgba(148, 163, 184, 0.35);
  --result-glow: rgba(59, 130, 246, 0.28);

  --header-control-bg: var(--surface-elevated);
  --header-control-fg: var(--ink);
  --header-control-icon: var(--muted);
}

html[data-theme='dark'] body {
  background:
    radial-gradient(circle at 10% 20%, rgba(37, 99, 235, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 90% 80%, rgba(16, 185, 129, 0.06) 0%, transparent 40%),
    var(--bg);
}

html[data-theme='dark'] .site-header {
  background: rgba(15, 23, 42, 0.92);
  border-bottom-color: var(--line);
}

html[data-theme='dark'] .theme-toggle,
html[data-theme='dark'] .language-control,
html[data-theme='dark'] .header-search,
html[data-theme='dark'] .home-guide-card,
html[data-theme='dark'] .guide-list-card,
html[data-theme='dark'] .content-card,
html[data-theme='dark'] .contact-ref-card,
html[data-theme='dark'] .legal-card,
html[data-theme='dark'] .date-form-card,
html[data-theme='dark'] .converter-form-card,
html[data-theme='dark'] .calculator-card,
html[data-theme='dark'] .side-card,
html[data-theme='dark'] .wide-card,
html[data-theme='dark'] .mobile-nav-drawer {
  background: var(--surface-elevated);
  border-color: var(--line);
}

html[data-theme='dark'] .calculator-card input,
html[data-theme='dark'] .calculator-card select,
html[data-theme='dark'] .contact-field input,
html[data-theme='dark'] .contact-field select,
html[data-theme='dark'] .contact-field textarea,
html[data-theme='dark'] .header-search input {
  background: var(--surface-input);
  color: var(--ink);
  border-color: var(--line);
}

/* Hero 搜索：input 与外壳同色，避免深色块嵌套 */
html[data-theme='dark'] .hero-search input {
  background: transparent;
  color: var(--ink);
}

html[data-theme='dark'] .hero-search,
html[data-theme='dark'] .home-cat,
html[data-theme='dark'] .converter-feature-card,
html[data-theme='dark'] .classification-main,
html[data-theme='dark'] .quick-action-card {
  border-color: var(--line);
}

html[data-theme='dark'] .hero-search input::placeholder {
  color: var(--muted);
  opacity: 1;
}

html[data-theme='dark'] .hero-search .search-mark {
  color: var(--muted);
}

html[data-theme='dark'] .hero-search {
  box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.35);
}

html[data-theme='dark'] .popular-converters-section {
  background: var(--surface-section-popular);
}

html[data-theme='dark'] .home-cat:hover {
  box-shadow: var(--shadow-xl);
}

html[data-theme='dark'] .site-footer {
  background: var(--footer-bg);
  border-top-color: var(--footer-divider);
}

html[data-theme='dark'] .category-section {
  border-color: var(--line);
}

html[data-theme='dark'] .matrix-column,
html[data-theme='dark'] .category-section .category-mini,
html[data-theme='dark'] .conversion-table,
html[data-theme='dark'] .directory-reference-card,
html[data-theme='dark'] .more-card,
html[data-theme='dark'] .related-card,
html[data-theme='dark'] .reference-row,
html[data-theme='dark'] .share-button {
  border-color: var(--line);
}

html[data-theme='dark'] .site-nav a.is-active {
  background: var(--blue-soft);
}

html[data-theme='dark'] .note-box {
  background: var(--blue-soft);
}

html[data-theme='dark'] .language-control__trigger {
  color: var(--header-control-fg);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
}

html[data-theme='dark'] .theme-toggle,
html[data-theme='dark'] .language-control {
  color: var(--header-control-fg);
}

html[data-theme='dark'] .theme-toggle:hover {
  color: #93c5fd;
}

html[data-theme='dark'] .theme-toggle:hover .theme-toggle-icon {
  color: #93c5fd;
}

html[data-theme='dark'] .language-menu__item {
  color: var(--header-control-fg);
}

html[data-theme='dark'] .language-menu__item:hover,
html[data-theme='dark'] .language-menu__item.is-selected {
  color: #93c5fd;
}

html[data-theme='dark'] .language-menu {
  background: #1e293b;
  border-color: var(--line);
  box-shadow: 0 20px 40px -12px rgba(0, 0, 0, 0.45);
}

.theme-toggle-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--header-control-icon);
}

.theme-toggle-icon .icon {
  width: 18px;
  height: 18px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* RTL layout */
html[dir='rtl'] .mobile-nav-drawer {
  right: auto;
  left: 0;
  border-left: none;
  border-right: 1px solid var(--line);
}

html[dir='rtl'] .breadcrumb,
html[dir='rtl'] .site-nav,
html[dir='rtl'] .footer-links {
  direction: rtl;
}

html[dir='rtl'] .guide-list-card::after,
html[dir='rtl'] .mobile-nav-link::after {
  transform: scaleX(-1);
}

html[dir='rtl'] .contact-field select {
  background-position: left 14px center;
  padding-left: 40px;
  padding-right: 14px;
}

html[dir='rtl'] .language-control>.icon {
  left: auto;
  right: 14px;
}

html[dir='rtl'] .language-control__trigger {
  padding: 0 2.5rem 0 2rem;
  background-position: left 12px center;
  text-align: right;
}

html[dir='rtl'] .header-actions {
  flex-direction: row-reverse;
}

html[dir='rtl'] .theme-toggle {
  flex-direction: row-reverse;
}