/* ============================================================
   算法模板库 · 全局样式
   与 blog 同一套配色 / 字体 / 交互语言
   ============================================================ */

:root {
  /* 配色（浅色）— 暖米白 + 石墨灰蓝 */
  --bg: #f6f5f2;
  --bg-soft: #eeedea;
  --card: #ffffff;
  --text: #1f2226;
  --text-soft: #5a6067;
  --text-faint: #8b9098;
  --accent: #5c6b7c;
  --accent-soft: rgba(92, 107, 124, 0.1);
  --border: #e5e3de;
  --shadow: 0 1px 2px rgba(31, 35, 40, 0.05);

  --font-serif: "Songti SC", "Noto Serif SC", "Source Han Serif SC",
    "STSong", SimSun, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", "Segoe UI",
    sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Code", Consolas,
    "Courier New", monospace;

  --maxw: 1200px;
  --radius: 14px;
  --gap: 1.5rem;

  /* 代码块：两种主题下都保持深色 */
  --code-bg: #0d0d12;
  --code-border: #23232b;
}

html[data-theme="dark"] {
  --bg: #000000;
  --bg-soft: #17171e;
  --card: #131318;
  --text: #e7e9ec;
  --text-soft: #a8b0ba;
  --text-faint: #6d7683;
  --accent: #f0f4f8;
  --accent-soft: rgba(255, 255, 255, 0.08);
  --border: #26262e;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  min-height: 100vh;
  line-height: 1.65;
  transition: background 0.25s ease, color 0.25s ease;
}

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 1.25rem;
}

::selection { background: var(--accent); color: var(--bg); }
a { color: inherit; }

/* ---------- 顶部导航 ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(14px) saturate(1.1);
  -webkit-backdrop-filter: blur(14px) saturate(1.1);
  border-bottom: 1px solid var(--border);
}
.site-header .nav {
  display: flex;
  align-items: center;
  gap: 1rem;
  height: 58px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  text-decoration: none;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.06rem;
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.brand svg { color: var(--accent); }
.back-home {
  font-size: 0.8rem;
  color: var(--text-faint);
  text-decoration: none;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.18rem 0.7rem;
  white-space: nowrap;
  transition: color 0.2s, border-color 0.2s;
}
.back-home:hover { color: var(--accent); border-color: var(--accent); }

.nav-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.search-box {
  position: relative;
  display: flex;
  align-items: center;
}
.search-icon {
  position: absolute;
  left: 0.6rem;
  display: flex;
  color: var(--text-faint);
  pointer-events: none;
}
.search-box input {
  width: 190px;
  padding: 0.42rem 0.75rem 0.42rem 2rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-soft);
  color: var(--text);
  font-size: 0.84rem;
  transition: width 0.25s ease, border-color 0.2s;
}
.search-box input:focus {
  outline: none;
  border-color: var(--accent);
  width: 240px;
}
.search-box input::placeholder { color: var(--text-faint); }

.theme-toggle,
.nav-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: transparent;
  color: var(--text-soft);
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
}
.theme-toggle:hover,
.nav-toggle:hover { color: var(--accent); border-color: var(--accent); }
.nav-toggle { display: none; }

/* 主题切换过渡（View Transition，右上圆形揭示） */
::view-transition-old(root) { animation: vt-fade 0.25s ease both; }
::view-transition-new(root) { animation: vt-reveal 0.4s ease both; }
@keyframes vt-fade { to { opacity: 0; } }
@keyframes vt-reveal {
  from { clip-path: circle(0 at 100% 0); }
  to   { clip-path: circle(150% at 100% 0); }
}

/* ---------- 布局 ---------- */

.layout {
  display: grid;
  grid-template-columns: 210px 1fr;
  gap: var(--gap);
  padding-top: 1.6rem;
  padding-bottom: 3rem;
}

/* 左侧分类栏 */
.side-col { position: sticky; top: 76px; align-self: start; }

.side-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 0.9rem 0.85rem;
  margin-bottom: 1rem;
}

/* 个人卡片（与 blog 一致） */
.profile-card { padding: 1.4rem 1.1rem; text-align: center; }
.avatar-img {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  object-fit: cover;
  display: block;
  margin: 0 auto 0.9rem;
  border: 3px solid var(--card);
  box-shadow: 0 0 0 3px var(--accent-soft), 0 4px 14px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.profile-card:hover .avatar-img {
  transform: scale(1.04);
  box-shadow: 0 0 0 3px var(--accent), 0 6px 18px rgba(0, 0, 0, 0.14);
}
.profile-name {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  margin-bottom: 0.35rem;
}
.profile-desc {
  color: var(--text-soft);
  font-size: 0.86rem;
  line-height: 1.7;
  margin-bottom: 0.85rem;
}
.profile-links {
  list-style: none;
  border-top: 1px solid var(--border);
  padding-top: 0.8rem;
  display: flex;
  flex-direction: column;
  gap: 0.42rem;
}
.profile-links a {
  color: var(--text-soft);
  font-size: 0.82rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.38rem;
  transition: color 0.2s;
}
.profile-links a:hover { color: var(--accent); text-decoration: none; }
.side-title {
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--text-faint);
  letter-spacing: 0.08em;
  margin-bottom: 0.55rem;
  padding-left: 0.35rem;
}
.cat-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  padding: 0.44rem 0.6rem;
  border-radius: 9px;
  font-size: 0.86rem;
  color: var(--text-soft);
  text-decoration: none;
  transition: background 0.15s, color 0.15s;
}
.cat-item b {
  font-size: 0.72rem;
  color: var(--text-faint);
  font-weight: 600;
}
.cat-item:hover { background: var(--accent-soft); color: var(--text); }
.cat-item.active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }

/* 移动端顶部分类条（桌面隐藏） */
.cat-chips {
  display: none;
  gap: 0.45rem;
  overflow-x: auto;
  padding: 0.7rem 1.25rem 0.2rem;
  scrollbar-width: none;
}
.cat-chips::-webkit-scrollbar { display: none; }
.chip {
  flex-shrink: 0;
  font-size: 0.78rem;
  color: var(--text-soft);
  text-decoration: none;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.28rem 0.8rem;
  background: var(--card);
  transition: color 0.15s, border-color 0.15s;
}
.chip.active { color: var(--accent); border-color: var(--accent); }

/* ---------- Hero ---------- */

.hero { padding: 1.4rem 0 1.7rem; }
.hero h1 {
  font-family: var(--font-serif);
  font-size: 2.1rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}
.hero .subtitle {
  color: var(--text-soft);
  font-size: 0.92rem;
  margin-top: 0.35rem;
}
.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 0.85rem;
}
.hero-stats span {
  font-size: 0.76rem;
  color: var(--text-soft);
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 999px;
  padding: 0.22rem 0.78rem;
}

/* ---------- 分类区块 ---------- */

.section-title {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  font-family: var(--font-serif);
  font-size: 1.22rem;
  font-weight: 700;
  margin: 2.1rem 0 0.95rem;
}
.section-title:first-child { margin-top: 0; }
.section-title .cnt {
  font-family: var(--font-sans);
  font-size: 0.74rem;
  font-weight: 500;
  color: var(--text-faint);
}

/* ---------- 模板卡片 ---------- */

.tpl-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 1rem;
  overflow: hidden;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.tpl-card:hover {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
}

.tpl-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  padding: 0.85rem 1rem 0.3rem;
}
.tpl-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.15rem 0;
  color: var(--text);
  font-family: inherit;
  text-align: left;
}
.tpl-toggle h3 {
  font-size: 0.98rem;
  font-weight: 600;
  transition: color 0.2s;
}
.tpl-toggle:hover h3 { color: var(--accent); }
.tpl-toggle .en {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 400;
  color: var(--text-faint);
  margin-left: 0.45rem;
}
.chev {
  flex-shrink: 0;
  color: var(--text-faint);
  transition: transform 0.25s ease;
}
.tpl-card.open .chev { transform: rotate(90deg); }

.tpl-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}
.badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 999px;
  padding: 0.16rem 0.62rem;
  white-space: nowrap;
}
.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.32rem;
  font-size: 0.76rem;
  color: var(--text-soft);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.26rem 0.66rem;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
}
.copy-btn:hover { color: var(--accent); border-color: var(--accent); }
.copy-btn.done { color: #4ade80; border-color: rgba(74, 222, 128, 0.5); }

.tpl-desc {
  padding: 0.15rem 1rem 0;
  font-size: 0.86rem;
  color: var(--text-soft);
}
.tpl-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  padding: 0.55rem 1rem 0;
}
.tag {
  font-size: 0.72rem;
  color: var(--text-faint);
  border: 1px dashed var(--border);
  border-radius: 999px;
  padding: 0.1rem 0.6rem;
}

/* 代码区：默认收起，open 展开 */
.code-wrap {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, opacity 0.25s ease, margin 0.3s ease;
}
.tpl-card.open .code-wrap {
  max-height: 2600px;
  opacity: 1;
  margin-top: 0.75rem;
}
pre {
  background: var(--code-bg);
  border-top: 1px solid var(--code-border);
  overflow-x: auto;
  padding: 1rem 1.1rem;
}
code {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.6;
  color: #d5d9e0;
  white-space: pre;
  tab-size: 4;
}

/* 高亮配色（One Dark 系） */
.tk-k { color: #c678dd; }              /* 关键字 */
.tk-t { color: #56b6c2; }              /* 类型/容器 */
.tk-s { color: #98c379; }              /* 字符串 */
.tk-n { color: #d19a66; }              /* 数字 */
.tk-c { color: #7a828e; font-style: italic; } /* 注释 */
.tk-p { color: #e5c07b; }              /* 预处理 */

#search-hint {
  color: var(--text-faint);
  text-align: center;
  padding: 2.5rem 0;
  font-size: 0.9rem;
}

.empty-hint {
  color: var(--text-faint);
  text-align: center;
  padding: 3rem 0;
}

/* ---------- 页脚 ---------- */

.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 1.5rem;
  padding: 1.4rem 0 1.8rem;
}
.site-footer .container {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-faint);
}
.site-footer a { color: var(--text-faint); text-decoration: none; }
.site-footer a:hover { color: var(--accent); }

/* ---------- 回到顶部 ---------- */

#back-to-top {
  position: fixed;
  right: 1.4rem;
  bottom: 1.6rem;
  z-index: 60;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity 0.25s, transform 0.25s, color 0.2s, border-color 0.2s;
}
#back-to-top.show {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}
#back-to-top:hover { color: var(--accent); border-color: var(--accent); }

/* ---------- 星空 + 流星（暗色专属） ---------- */

html[data-theme="dark"] #starfield {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}
.star {
  position: absolute;
  border-radius: 50%;
  background: #fff;
  opacity: 0.5;
  display: none;
}
html[data-theme="dark"] .star { display: block; }
.meteor {
  position: fixed;
  z-index: 0;
  width: 130px;
  height: 1px;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.85), transparent);
  transform: rotate(-24deg);
  animation: meteor-fly 1.8s cubic-bezier(0.2, 0.6, 0.3, 1) both;
  pointer-events: none;
  display: none;
}
html[data-theme="dark"] .meteor { display: block; }
@keyframes meteor-fly {
  0%   { opacity: 0; translate: 60px -30px; }
  12%  { opacity: 1; }
  100% { opacity: 0; translate: -340px 150px; }
}
@keyframes twinkle {
  0%, 100% { opacity: 0.15; transform: scale(0.85); }
  50%      { opacity: 0.85; transform: scale(1.15); }
}

/* ---------- 滚动渐入 ---------- */

html.js .reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
html.js .reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 响应式 ---------- */

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; padding-top: 0.6rem; }
  .side-col { position: static; display: none; }
  .cat-chips { display: flex; }
  .nav-toggle { display: flex; }

  /* 菜单展开时把侧栏抽出来盖在内容上方 */
  body.menu-open .layout { grid-template-columns: 1fr; }
  body.menu-open .side-col {
    display: block;
    position: sticky;
    top: 64px;
    z-index: 40;
    margin-bottom: 0.8rem;
  }

  .hero h1 { font-size: 1.7rem; }
  .search-box input { width: 130px; }
  .search-box input:focus { width: 160px; }
}

@media (max-width: 560px) {
  .container { padding: 0 0.9rem; }
  .cat-chips { padding-left: 0.9rem; padding-right: 0.9rem; }
  .tpl-head { flex-wrap: wrap; row-gap: 0.4rem; }
  .tpl-meta { margin-left: 1.65rem; }
  code { font-size: 0.74rem; }
  pre { padding: 0.85rem 0.9rem; }
}

/* ---------- 减少动效偏好 ---------- */

@media (prefers-reduced-motion: reduce) {
  ::view-transition-old(root),
  ::view-transition-new(root),
  .meteor,
  .star { animation: none !important; }
  html.js .reveal { opacity: 1; transform: none; transition: none; }
  .code-wrap { transition: none; }
}