/* ============================================
   Yeo 工具箱 — 全局样式系统
   世界：桌面文具 · 计算器按键与便签纸
   纸白基底 · 墨灰文字 · 黛绿点缀 · 按键与刻度
   ============================================ */

/* ---------- Design tokens ---------- */
:root {
  --c-primary: #2f6b5e;
  --c-primary-hover: #275b50;
  --c-primary-soft: #e9f1ee;
  --c-bg: #f6f7f5;
  --c-bg-secondary: #eef0ed;
  --c-bg-tertiary: #e3e6e2;
  --c-text: #20241f;
  --c-text-secondary: #4e5750;
  --c-text-muted: #68736b;
  --c-border: #d9ddd8;
  --c-success: #2f6b5e;
  --c-warning: #a26a22;
  --c-error: #b6402f;
  --c-code-bg: #1d221e;
  --c-code-text: #e4e8e3;
  --c-ink: #20241f;
  --c-paper: #ffffff;
  --shadow-sm: 0 1px 2px rgba(32,36,31,0.05);
  --shadow-md: 0 6px 16px -4px rgba(32,36,31,0.10);
  --shadow-lg: 0 16px 36px -8px rgba(32,36,31,0.14);
  --radius-sm: 6px;   /* 小标签 / 角标 */
  --radius: 10px;      /* 按键 / 输入框 / 按钮 */
  --radius-lg: 14px;   /* 卡片 / 面板 */
  --max-width: 1200px;
  --header-h: 64px;
  --transition: 0.2s ease;
}

/* 暗色外壳（跟随系统偏好，工具面板保持浅色优先） */
@media (prefers-color-scheme: dark) {
  :root {
    --c-primary: #3e7d6f;
    --c-primary-hover: #4f9081;
    --c-primary-soft: #22302c;
    --c-bg: #161917;
    --c-bg-secondary: #1d211e;
    --c-bg-tertiary: #262b27;
    --c-text: #e7ebe6;
    --c-text-secondary: #aeb6af;
    --c-text-muted: #8f9891;
    --c-border: #333a35;
    --c-paper: #20241f;
    --c-ink: #e7ebe6;
    --c-code-bg: #0e110f;
    --c-code-text: #d8ddd7;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 6px 16px -4px rgba(0,0,0,0.4);
    --shadow-lg: 0 16px 36px -8px rgba(0,0,0,0.5);
  }
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Microsoft YaHei", "Helvetica Neue", sans-serif;
  line-height: 1.65;
  color: var(--c-text);
  background: var(--c-bg);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3 { font-weight: 700; letter-spacing: 0; }
h1 { font-size: 2.25rem; line-height: 1.2; }
h2 { font-size: 1.5rem; line-height: 1.25; }
h3 { font-size: 1.1rem; line-height: 1.35; }
a { color: var(--c-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; }
input, textarea, select, button { font-family: inherit; font-size: inherit; }
.idx, .stat-num { font-variant-numeric: tabular-nums; }

/* ---------- Layout ---------- */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; width: 100%; }
.main-content { flex: 1; padding: 40px 0 72px; }

/* ---------- Header ---------- */
.site-header {
  height: var(--header-h);
  background: var(--c-bg);
  border-bottom: 1px solid var(--c-border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.18rem;
  font-weight: 700;
  color: var(--c-text);
  white-space: nowrap;
}
.logo:hover { text-decoration: none; color: var(--c-text); }
.logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
}
.logo-mark svg {
  width: 100%;
  height: 100%;
  display: block;
}
.header-search {
  display: flex;
  align-items: center;
  background: var(--c-paper);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 0 14px;
  width: 320px;
  max-width: 40%;
  transition: var(--transition);
}
.header-search:focus-within {
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(47,107,94,0.12);
}
.header-search input {
  border: none;
  background: transparent;
  padding: 9px 0;
  outline: none;
  flex: 1;
  font-size: 14px;
  color: var(--c-text);
}
.header-search button {
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  color: var(--c-text-muted);
  font-size: 16px;
}

/* ---------- Mobile nav ---------- */
.nav-toggle {
  display: none;
}
.mobile-nav {
  display: none;
}
@media (max-width: 768px) {
  .nav-toggle {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    width: 40px;
    height: 40px;
    flex: none;
    background: none;
    border: 1px solid var(--c-border);
    border-radius: var(--radius);
    cursor: pointer;
    padding: 0;
  }
  .nav-toggle-bar {
    display: block;
    width: 18px;
    height: 2px;
    background: var(--c-text);
    border-radius: 2px;
    transition: transform var(--transition), opacity var(--transition);
  }
  .nav-toggle.is-active .nav-toggle-bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
  .nav-toggle.is-active .nav-toggle-bar:nth-child(2) { opacity: 0; }
  .nav-toggle.is-active .nav-toggle-bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
  .mobile-nav {
    display: block;
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 90;
    background: var(--c-bg);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
  }
  .mobile-nav.is-open {
    opacity: 1;
    visibility: visible;
    transform: none;
  }
  .mobile-nav-inner {
    padding: 16px 12px 48px;
    max-width: var(--max-width);
    margin: 0 auto;
  }
  .mobile-search {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--c-paper);
    border: 1px solid var(--c-border);
    border-radius: var(--radius);
    padding: 0 12px;
    margin-bottom: 14px;
  }
  .mobile-search input {
    flex: 1;
    min-width: 0;
    border: none;
    outline: none;
    background: transparent;
    padding: 13px 0;
    font-size: 15px;
    color: var(--c-text);
  }
  .mobile-search button {
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    color: var(--c-text-muted);
    font-size: 16px;
  }
  .mobile-nav-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }
  .mobile-nav-link {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--c-paper);
    border: 1px solid var(--c-border);
    border-radius: var(--radius);
    padding: 13px 14px;
    font-size: 14px;
    font-weight: 600;
    color: var(--c-text);
  }
  .mobile-nav-link:hover {
    text-decoration: none;
    border-color: var(--c-primary);
    color: var(--c-primary);
  }
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--c-bg-secondary);
  border-top: 1px solid var(--c-border);
  padding: 24px 0;
  text-align: center;
  font-size: 13px;
  color: var(--c-text-muted);
  margin-top: auto;
}
.site-footer a { color: var(--c-text-secondary); }
.site-footer a:hover { color: var(--c-primary); }

/* ---------- Footer 全站工具导航 ---------- */
.footer-tools {
  background: var(--c-bg-secondary);
  border-top: 1px solid var(--c-border);
  padding: 40px 0 32px;
}
.footer-tools-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}
.footer-tools-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: 22px;
}
.footer-tools-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px 26px;
}
.footer-tools-col strong {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14.5px;
  font-weight: 700;
  color: var(--c-text);
  padding-bottom: 10px;
  margin-bottom: 10px;
  border-bottom: 1px solid var(--c-border);
}
.footer-tools-col strong::before {
  content: "";
  width: 7px;
  height: 7px;
  background: var(--c-primary);
  border-radius: 2px;
}
.footer-tools-count {
  margin-left: auto;
  font-size: 11px;
  font-weight: 400;
  color: var(--c-text-muted);
  background: var(--c-bg-tertiary);
  border-radius: var(--radius-sm);
  padding: 1px 8px;
}
.footer-tools-col a {
  display: block;
  font-size: 12.5px;
  color: var(--c-text-secondary);
  line-height: 1.9;
  text-decoration: none;
  transition: color var(--transition);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.footer-tools-col a:hover {
  color: var(--c-primary);
  text-decoration: underline;
}
.footer-tools-col summary {
  list-style: none;
  cursor: pointer;
}
.footer-tools-col summary::-webkit-details-marker { display: none; }
.footer-tools-col summary:focus-visible {
  outline: 2px solid var(--c-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}
@media (max-width: 900px) {
  .footer-tools-grid { grid-template-columns: repeat(2, 1fr); gap: 24px 18px; }
}
@media (max-width: 480px) {
  .footer-tools-grid { grid-template-columns: 1fr; }
  .footer-tools-col summary {
    display: flex;
    align-items: center;
  }
  .footer-tools-col summary::after {
    content: "+";
    margin-left: auto;
    font-size: 18px;
    line-height: 1;
    color: var(--c-text-muted);
  }
  .footer-tools-col[open] summary::after { content: "−"; }
  .footer-tools-links { padding: 2px 0 10px; }
}

/* ---------- Buttons（计算器按键手感） ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  font-weight: 600;
  transition: var(--transition);
  text-decoration: none;
}
.btn-primary {
  background: var(--c-primary);
  color: #fff;
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover { background: var(--c-primary-hover); text-decoration: none; }
.btn-primary:active { transform: scale(0.98); }
.btn-outline {
  background: var(--c-paper);
  color: var(--c-ink);
  border: 1px solid var(--c-border);
}
.btn-outline:hover { border-color: var(--c-primary); color: var(--c-primary); text-decoration: none; }
.btn-outline:active { transform: scale(0.98); }
.btn-sm { padding: 6px 14px; font-size: 13px; }
.btn-lg { padding: 14px 28px; font-size: 16px; }
.btn-success { background: var(--c-success); color: #fff; }

/* ---------- Cards ---------- */
.card {
  background: var(--c-paper);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: var(--transition);
}
.card:hover { border-color: var(--c-primary); }
.card h3 { margin-bottom: 12px; }
.card p { margin-bottom: 8px; }
.card input { margin-bottom: 8px; }

/* ---------- Tool Card（便签纸） ---------- */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 14px;
  margin: 26px 0;
}
.tool-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 20px 20px 18px;
  background: var(--c-paper);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  transition: var(--transition);
  text-decoration: none;
  color: var(--c-text);
  overflow: hidden;
}
.tool-card:hover {
  border-color: var(--c-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  text-decoration: none;
}
.tool-card:hover .tool-card-title { color: var(--c-primary); }
.tool-card-icon { font-size: 26px; margin-bottom: 10px; }
.tool-card-title { font-size: 16px; font-weight: 700; margin-bottom: 4px; transition: color var(--transition); }
.tool-card-desc { font-size: 13px; color: var(--c-text-muted); }

/* ---------- 首页 ---------- */
.home-hero {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 48px;
  align-items: start;
  padding: 36px 0 48px;
}
.hero-main h1 {
  font-size: 2.6rem;
  line-height: 1.18;
  margin-bottom: 16px;
  animation: hero-in 0.6s cubic-bezier(0.22, 1, 0.36, 1) both;
}
.hero-sub {
  font-size: 1.04rem;
  color: var(--c-text-secondary);
  max-width: 46ch;
  margin-bottom: 26px;
}
.hero-cta { margin-bottom: 8px; }
.hero-index {
  background: var(--c-paper);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 18px 22px 10px;
  box-shadow: var(--shadow-sm);
}
.hero-index-item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px solid var(--c-border);
  color: var(--c-text);
  font-size: 14px;
}
.hero-index-item:last-child { border-bottom: none; }
.hero-index-item .idx { font-size: 11px; color: var(--c-text-muted); }
.hero-index-item:hover { color: var(--c-primary); text-decoration: none; }
@keyframes hero-in { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .hero-main h1 { animation: none; } }

.cat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.cat-card {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--c-paper);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 14px 16px;
  font-weight: 600;
  color: var(--c-text);
  transition: var(--transition);
}
.cat-card:hover {
  border-color: var(--c-primary);
  background: var(--c-primary-soft);
  text-decoration: none;
}
.cat-card:hover .cat-count { color: var(--c-primary); }
.cat-card .cat-icon { font-size: 20px; }
.cat-card .cat-count { margin-left: auto; font-size: 12px; color: var(--c-text-muted); font-weight: 400; }

.tool-card { position: relative; }
.badge-new {
  position: absolute;
  top: 10px;
  right: 10px;
  background: var(--c-primary);
  color: #fff;
  font-size: 11px;
  padding: 2px 7px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  letter-spacing: 0.04em;
}
.new-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
}
.new-strip-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 12px;
  border-left: 1px solid var(--c-border);
  color: var(--c-text);
  font-size: 14px;
}
.new-strip-item:first-child { border-left: none; padding-left: 0; }
.new-strip-item:hover { text-decoration: none; }
.new-strip-item:hover .new-strip-name { color: var(--c-primary); }
.new-strip-idx { font-size: 11px; color: var(--c-text-muted); }
.new-strip-name { font-weight: 600; transition: color var(--transition); }
.new-chip {
  margin-left: auto;
  background: var(--c-primary);
  color: #fff;
  font-size: 10px;
  padding: 2px 7px;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
}
.topic-card {
  display: block;
  padding: 20px 22px 18px 0;
  border-left: 1px solid var(--c-border);
  color: var(--c-text);
  transition: var(--transition);
}
.topic-card:first-child { border-left: none; padding-left: 0; }
.topic-card:hover { text-decoration: none; }
.topic-card:hover h3 { color: var(--c-primary); }
.topic-card h3 { margin-bottom: 8px; font-size: 1.05rem; transition: color var(--transition); }
.topic-card p { font-size: 13px; color: var(--c-text-muted); }
.topic-card::after {
  content: "→";
  display: block;
  margin-top: 12px;
  font-size: 15px;
  color: var(--c-text-muted);
  transition: color var(--transition);
}
.topic-card:hover::after { color: var(--c-primary); }

.scenario-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0 30px; }
.scenario-card {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  border-top: 1px solid var(--c-border);
  padding: 16px 4px;
  color: var(--c-text);
  transition: var(--transition);
}
.scenario-card:hover { text-decoration: none; }
.scenario-card:hover strong { color: var(--c-primary); }
.scenario-card .s-icon { font-size: 19px; color: var(--c-text-muted); }
.scenario-card strong { transition: color var(--transition); }
.collection-intro { max-width: 760px; }

/* ---------- 全部工具：分类切换 ---------- */
.all-tools-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}
.all-tools-tab {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: var(--c-paper);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 13.5px;
  color: var(--c-text);
  cursor: pointer;
  transition: var(--transition);
}
.all-tools-tab:hover {
  border-color: var(--c-primary);
  color: var(--c-primary);
}
.all-tools-tab.is-active {
  background: var(--c-primary);
  border-color: var(--c-primary);
  color: #fff;
}
.all-tools-tab-count {
  font-size: 11px;
  font-weight: 400;
  opacity: 0.78;
}
.all-tools-panel {
  display: block;
}
.js .all-tools-panel {
  display: none;
}
.js .all-tools-panel.is-active {
  display: block;
}

/* ---------- Section ---------- */
.section { margin-bottom: 48px; }
.section-title {
  font-size: 1.45rem;
  font-weight: 700;
  margin: 56px 0 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--c-border);
}
.section-desc { color: var(--c-text-muted); margin-bottom: 22px; font-size: 14px; }

/* ---------- 工具页正文 ---------- */
.tool-content h2 {
  font-size: 1.3rem;
  font-weight: 700;
  margin: 40px 0 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--c-border);
}
.tool-content h3 { margin: 20px 0 8px; }
.tool-content ul, .tool-content ol { margin: 0 0 14px 22px; }
.tool-content li { margin-bottom: 5px; }
.tool-content p { margin-bottom: 12px; }

/* ---------- Breadcrumb ---------- */
.breadcrumb { font-size: 13px; color: var(--c-text-muted); margin-bottom: 20px; }
.breadcrumb a { color: var(--c-text-secondary); }
.breadcrumb a:hover { color: var(--c-primary); }
.breadcrumb .crumb-current { color: var(--c-text); }
.breadcrumb .crumb-sep { margin: 0 7px; color: var(--c-text-muted); }

/* ---------- Code Block ---------- */
.code-block {
  background: var(--c-code-bg);
  color: var(--c-code-text);
  padding: 16px;
  border-radius: var(--radius);
  font-family: "SF Mono", "Fira Code", "Consolas", monospace;
  font-size: 14px;
  line-height: 1.5;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
  margin-bottom: 12px;
}

/* ---------- Toast ---------- */
.toast {
  position: fixed;
  top: 80px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--c-code-bg);
  color: var(--c-code-text);
  padding: 12px 24px;
  border-radius: var(--radius);
  font-size: 14px;
  z-index: 1000;
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}
.toast.show { opacity: 1; }
.toast.success { background: var(--c-success); color: #fff; }
.toast.error { background: var(--c-error); color: #fff; }

/* ---------- Tag ---------- */
.tag {
  display: inline-block;
  padding: 2px 10px;
  background: var(--c-bg-tertiary);
  border-radius: var(--radius-sm);
  font-size: 12px;
  color: var(--c-text-secondary);
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .home-hero { grid-template-columns: 1fr; gap: 30px; }
  .cat-grid, .scenario-grid { grid-template-columns: repeat(2, 1fr); }
  .topic-grid { grid-template-columns: 1fr; }
  .topic-card { border-left: none; border-top: 1px solid var(--c-border); padding: 18px 0; }
  .topic-card:first-child { border-top: none; }
  .new-strip { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .tool-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .header-search { width: 200px; max-width: 60%; }
  .header-inner { padding: 0 12px; }
  .container { padding: 0 12px; }
  .logo { font-size: 1.05rem; }
}
@media (max-width: 480px) {
  .tool-grid { grid-template-columns: 1fr; }
  .header-search { display: none; }
  .cat-grid, .scenario-grid { grid-template-columns: 1fr; }
  .new-strip { grid-template-columns: 1fr; }
  .hero-main h1 { font-size: 1.8rem; }
  .btn-sm { padding: 10px 16px; font-size: 14px; }
  .breadcrumb .crumb, .breadcrumb .crumb-sep { display: none; }
  .breadcrumb .crumb:last-child { display: inline; }
}