/* components.css — 跨页面共享组件
   页面级布局在 style.css；这里只放 container / header / footer / 卡片 / 工具条等。 */

*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; height: auto; }

a { color: inherit; text-decoration: none; }

button, input, select { font: inherit; color: inherit; }

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.22;
  margin: 0;
  letter-spacing: 0.01em;
}

p { margin: 0; }

ul, ol { margin: 0; padding: 0; list-style: none; }

:focus-visible {
  outline: 2px solid var(--brick);
  outline-offset: 3px;
}

::selection { background: var(--olive); color: var(--paper-raised); }

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 100;
  padding: 0.6rem 1rem;
  background: var(--olive);
  color: var(--white);
  border-radius: var(--radius);
  transition: top var(--dur) var(--ease);
}
.skip-link:focus { top: 1rem; }

/* ---------- 站点头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: color-mix(in srgb, var(--paper) 98%, transparent);
  border-bottom: 1px solid var(--line);
  /* 注意：这里不能用 backdrop-filter —— 它会让页头成为 fixed 子元素（移动抽屉）的包含块，
     抽屉的 inset 将相对页头计算，高度塌成 1px。 */
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 2rem;
  min-height: 76px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  flex-shrink: 0;
  font-family: var(--font-serif);
  font-size: 1.3rem;
  letter-spacing: 0.1em;
  color: var(--ink);
}

.logo svg { width: 32px; height: 32px; color: var(--olive); }

.site-nav { margin-left: auto; }

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(0.8rem, 1.7vw, 1.6rem);
  font-size: var(--text-sm);
}

.nav-list a {
  position: relative;
  display: inline-block;
  padding: 0.9rem 0;
  color: var(--ink-soft);
  letter-spacing: 0.03em;
  transition: color var(--dur) var(--ease);
}
.nav-list a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0.45rem;
  width: 100%;
  height: 1px;
  background: var(--brick);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur) var(--ease);
}
.nav-list a:hover,
.nav-list a[aria-current="page"] { color: var(--ink); }
.nav-list a:hover::after,
.nav-list a[aria-current="page"]::after { transform: scaleX(1); }

/* 导航下拉 */
.nav-list .dropdown { position: relative; }
.nav-list .dropdown > a { display: inline-flex; align-items: center; gap: 4px; white-space: nowrap; }
.nav-list .caret {
  display: inline-block; width: 5px; height: 5px; margin-top: -3px;
  border-right: 1.3px solid currentColor; border-bottom: 1.3px solid currentColor;
  transform: rotate(45deg); transition: transform var(--dur) var(--ease);
}
.nav-list .dropdown:hover .caret { transform: translateY(2px) rotate(225deg); }
.dropdown-menu {
  display: none; position: absolute; left: -0.85rem; top: 100%; z-index: 60;
  min-width: 200px; max-height: 340px; overflow-y: auto;
  padding: 0.5rem 0.35rem; margin: 0; list-style: none;
  background: var(--paper-raised); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow-lift);
}
.nav-list .dropdown:hover > .dropdown-menu { display: block; }
.dropdown-menu li { display: block; }
.dropdown-menu a {
  display: block; padding: 0.5rem 0.7rem; border-bottom: 0;
  font-size: var(--text-sm); line-height: 1.5; color: var(--ink-soft); white-space: normal;
}
.dropdown-menu a::after { display: none; }
.dropdown-menu a:hover { background: var(--paper-deep); color: var(--ink); }

.header-note {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--muted);
  border-left: 1px solid var(--line-strong);
  padding-left: 1rem;
  white-space: nowrap;
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  margin-left: auto;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: transparent;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}
.menu-toggle svg { width: 22px; height: 22px; }
.menu-toggle .icon-close { display: none; }
.menu-toggle[aria-expanded="true"] .icon-open { display: none; }
.menu-toggle[aria-expanded="true"] .icon-close { display: block; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 46px;
  padding: 0.65rem 1.4rem;
  border: 1px solid var(--brick);
  border-radius: var(--radius);
  background: var(--brick);
  color: var(--white);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.btn:hover { background: var(--brick-deep); transform: translateY(-1px); }

.btn--ghost {
  background: transparent;
  color: var(--white);
  border-color: color-mix(in srgb, var(--white) 55%, transparent);
}
.btn--ghost:hover { background: color-mix(in srgb, var(--white) 14%, transparent); border-color: var(--white); }

.btn--ink {
  background: transparent;
  color: var(--olive);
  border-color: var(--line-strong);
}
.btn--ink:hover { background: var(--paper-raised); border-color: var(--olive); color: var(--olive-deep); }

.btn .arrow { transition: transform var(--dur) var(--ease); }
.btn:hover .arrow { transform: translateX(4px); }

/* ---------- 章节标题 ---------- */
.section { padding-block: clamp(2.5rem, 4.6vw, 3.9rem); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem 2rem;
  margin-bottom: clamp(1.6rem, 2.8vw, 2.3rem);
}

.section-title {
  position: relative;
  padding-left: 1.05rem;
  font-size: clamp(1.45rem, 2.3vw, 1.95rem);
}
.section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.16em;
  bottom: 0.16em;
  width: 3px;
  background: var(--olive);
}

.section-title .num {
  display: inline-block;
  margin-right: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.66em;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--brick);
  vertical-align: 0.25em;
}

.section-lede {
  max-width: 64ch;
  margin-top: 0.85rem;
  padding-left: 1.05rem;
  color: var(--muted);
  font-size: var(--text-sm);
  line-height: 1.9;
}

.section-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: var(--text-sm);
  color: var(--olive);
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 0.2rem;
  transition: border-color var(--dur) var(--ease);
}
.section-link:hover { border-color: var(--olive); }

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ---------- 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 0.1rem 0.55rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: var(--paper-raised);
  color: var(--muted);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  white-space: nowrap;
}
.tag--accent {
  background: var(--brick-soft);
  border-color: transparent;
  color: #7d3225;
}
.tag--olive {
  background: var(--olive-soft);
  border-color: transparent;
  color: var(--olive);
}

/* ---------- 卡片 ---------- */
.card {
  display: flex;
  flex-direction: column;
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.card:hover {
  transform: translateY(-4px);
  border-color: var(--line-strong);
  box-shadow: var(--shadow-lift);
}

.card-media {
  position: relative;
  overflow: hidden;
  background: var(--paper-deep);
  aspect-ratio: 16 / 10;
}
.card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 600ms var(--ease);
}
.card:hover .card-media img { transform: scale(1.035); }

.card-body {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  padding: 1.05rem 1.1rem 1.2rem;
}

.card-title {
  font-size: 1.1rem;
  line-height: 1.5;
}

.card-text {
  color: var(--muted);
  font-size: var(--text-sm);
  line-height: 1.78;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-top: auto;
  padding-top: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--muted);
  letter-spacing: 0.06em;
}

/* ---------- 链接箭头 ---------- */
.arrow {
  display: inline-block;
  width: 1em;
  height: 1em;
  flex-shrink: 0;
}

/* ---------- 筛选条 ---------- */
.toolbar {
  position: sticky;
  top: 76px;
  z-index: 20;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  padding: 0.85rem 0;
  background: color-mix(in srgb, var(--paper) 94%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.chip-row {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 2px;
  scrollbar-width: none;
}
.chip-row::-webkit-scrollbar { display: none; }

.chip {
  flex-shrink: 0;
  min-height: 36px;
  padding: 0.3rem 0.95rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: transparent;
  color: var(--ink-soft);
  font-size: var(--text-sm);
  cursor: pointer;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.chip:hover { border-color: var(--olive); color: var(--olive); }
.chip[aria-pressed="true"] {
  background: var(--olive);
  border-color: var(--olive);
  color: var(--white);
}

.toolbar-right {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin-left: auto;
  font-size: var(--text-sm);
  color: var(--muted);
}

.count { font-family: var(--font-mono); font-variant-numeric: tabular-nums; color: var(--ink-soft); }

.select-wrap {
  position: relative;
  display: inline-flex;
  align-items: center;
}
.select-wrap select {
  appearance: none;
  min-height: 36px;
  padding: 0.3rem 2rem 0.3rem 0.85rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--paper-raised);
  font-size: var(--text-sm);
  cursor: pointer;
}
.select-wrap::after {
  content: "";
  position: absolute;
  right: 0.75rem;
  width: 6px;
  height: 6px;
  border-right: 1.5px solid var(--muted);
  border-bottom: 1.5px solid var(--muted);
  transform: translateY(-2px) rotate(45deg);
  pointer-events: none;
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  padding-block: 1.1rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--muted);
  letter-spacing: 0.05em;
}
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--olive); }
.breadcrumb .sep { color: var(--line-strong); }
.breadcrumb [aria-current="page"] { color: var(--ink-soft); }

/* ---------- 表格 ---------- */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--paper-raised);
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
  min-width: 720px;
}
.spec-table th,
.spec-table td {
  padding: 0.9rem 1.05rem;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}
.spec-table thead th {
  background: var(--olive);
  color: var(--paper-raised);
  font-weight: 500;
  letter-spacing: 0.08em;
  font-size: var(--text-xs);
}
.spec-table tbody th {
  font-weight: 600;
  color: var(--olive);
  white-space: nowrap;
}
.spec-table tbody tr:last-child th,
.spec-table tbody tr:last-child td { border-bottom: 0; }
.spec-table tbody tr:nth-child(even) { background: color-mix(in srgb, var(--paper) 55%, transparent); }

/* ---------- FAQ ---------- */
.faq-list { border-top: 1px solid var(--line); }

.faq-item { border-bottom: 1px solid var(--line); }

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1.05rem 0.25rem;
  font-family: var(--font-serif);
  font-size: 1.05rem;
  cursor: pointer;
  list-style: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "";
  width: 8px;
  height: 8px;
  flex-shrink: 0;
  border-right: 1.5px solid var(--olive);
  border-bottom: 1.5px solid var(--olive);
  transform: rotate(45deg);
  transition: transform var(--dur) var(--ease);
}
.faq-item[open] summary::after { transform: rotate(-135deg); }
.faq-item p {
  padding: 0 2.5rem 1.2rem 0.25rem;
  color: var(--muted);
  font-size: var(--text-sm);
  line-height: 1.88;
}

/* ---------- 页脚 ---------- */
.site-footer {
  margin-top: var(--section-gap);
  background: var(--olive-deep);
  color: color-mix(in srgb, var(--paper-raised) 82%, transparent);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-start;
  gap: 2rem 2.5rem;
  padding-block: 3.1rem 2.15rem;
}
.footer-col { flex: 1 1 11rem; min-width: 10rem; }
.footer-col--brand { flex: 2 1 17rem; max-width: 24rem; }

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.95rem;
  font-family: var(--font-serif);
  font-size: 1.3rem;
  letter-spacing: 0.1em;
  color: var(--paper-raised);
}
.footer-brand svg { width: 30px; height: 30px; }

.footer-desc { max-width: 48ch; font-size: var(--text-sm); line-height: 1.9; }

.footer-nav-title {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  color: color-mix(in srgb, var(--paper-raised) 55%, transparent);
  margin-bottom: 0.8rem;
}

.footer-nav {
  display: flex;
  flex-direction: column;
  gap: 0.42rem;
  font-size: var(--text-sm);
}
.footer-nav a { color: color-mix(in srgb, var(--paper-raised) 88%, transparent); }
.footer-nav a:hover { color: var(--white); text-decoration: underline; text-underline-offset: 5px; }

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding-block: 1.1rem;
  border-top: 1px solid color-mix(in srgb, var(--paper-raised) 16%, transparent);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  color: color-mix(in srgb, var(--paper-raised) 55%, transparent);
}

/* ---------- 正文配图与上下篇 ---------- */
.article-figure { overflow: hidden; }
.article-figure img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }

.article-body figure { margin: 1.4rem 0 1.7rem; }
.article-body figure img { width: 100%; border-radius: var(--radius); object-fit: cover; }

.article-nav {
  display: flex; flex-wrap: nowrap; justify-content: space-between; align-items: stretch;
  gap: 1rem; margin-top: 2.4rem; padding-top: 1.3rem; border-top: 1px solid var(--line);
}
.article-nav a {
  flex: 1 1 0; min-width: 0; max-width: calc(50% - 0.5rem); display: block;
  padding: 0.85rem 1rem; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--paper-raised); transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.article-nav a:hover { border-color: var(--line-strong); transform: translateY(-2px); }
.article-nav .nav-label {
  display: block; margin-bottom: 0.3rem; font-family: var(--font-mono);
  font-size: 0.64rem; letter-spacing: 0.14em; color: var(--muted);
}
.article-nav h3 { font-size: var(--text-sm); line-height: 1.5; }
.article-nav .nav-next { text-align: right; margin-left: auto; }

/* ---------- 分页 ---------- */
.pager { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.45rem; margin-top: 2.1rem; }
.pager a, .pager .pager-current, .pager .pager-gap {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 2.25rem; min-height: 2.25rem; padding: 0.25rem 0.7rem;
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--paper-raised); font-size: var(--text-sm); color: var(--ink-soft);
}
.pager a:hover { border-color: var(--olive); color: var(--olive); }
.pager .pager-current { background: var(--olive); border-color: var(--olive); color: var(--white); }
.pager .pager-gap { border: 0; background: transparent; color: var(--muted); }

/* ---------- 首页：最新笔记带缩略图 ---------- */
.note-item .thumb {
  display: block; flex: none; width: 4.2rem; aspect-ratio: 4 / 3;
  overflow: hidden; border-radius: var(--radius); background: var(--paper-deep);
}
.note-item .thumb img { width: 100%; height: 100%; object-fit: cover; }
.note-item .body { align-items: center; }

/* ---------- 工具类 ---------- */
.nw { white-space: nowrap; }

.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;
}

[hidden] { display: none !important; }

body.nav-open { overflow: hidden; }

@media (max-width: 1100px) {
  .nav-list { gap: 0.8rem; font-size: 0.82rem; }
  .header-note { display: none; }
}

@media (max-width: 960px) {
  .menu-toggle { display: inline-flex; }
  .site-nav {
    position: fixed;
    inset: 76px 0 0;
    z-index: var(--z-menu);
    display: none;
    overflow-y: auto;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-lift);
  }
  .site-nav.is-open { display: block; }
  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.5rem var(--gutter) 1.5rem;
    font-size: var(--text-base);
  }
  .nav-list a { padding: 0.8rem 0; border-bottom: 1px solid var(--line); }
  .nav-list a::after { display: none; }
  .nav-list a[aria-current="page"] { color: var(--olive); }
  .nav-list .dropdown { display: block; }
  .nav-list .dropdown > a { justify-content: space-between; }
  .nav-list .caret { display: none; }
  .dropdown-menu {
    position: static; display: block; min-width: 0; max-height: none;
    padding: 0 0 0.4rem 0.85rem; border: 0; box-shadow: none; background: transparent;
  }
  .dropdown-menu a { padding: 0.45rem 0; border-bottom: 0; color: var(--muted); }

  .footer-inner { grid-template-columns: 1fr; gap: 2rem; }
}

@media (max-width: 600px) {
  .header-inner { min-height: 66px; gap: 1rem; }
  .logo { font-size: 1.12rem; }
  .logo svg { width: 26px; height: 26px; }
  .site-nav { inset: 66px 0 0; }
  .toolbar { top: 66px; }
  .toolbar-right { width: 100%; margin-left: 0; justify-content: space-between; }
  .section-lede { padding-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}