/* 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:'PingFang SC','Microsoft YaHei','Noto Sans SC',-apple-system,BlinkMacSystemFont,'Segoe UI',Arial,sans-serif;
  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(--teal);
  outline-offset: 3px;
}

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

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

.skip-link {
  position: absolute;
  left: 16px;
  top: -4rem;
  z-index: 100;
  padding: 9.6px 16px;
  background: var(--teal);
  color: var(--white);
  border-radius: var(--radius);
  transition: top var(--dur) var(--ease);
}
.skip-link:focus { top: 16px; }

/* ---------- 站点头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: color-mix(in srgb, var(--paper) 96%, transparent);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 32px;
  min-height: 78px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10.4px;
  flex-shrink: 0;
  font-family: var(--font-serif);
  font-size: 21.6px;
  letter-spacing: 0.14em;
  color: var(--ink);
}

.logo svg { width: 34px; height: 34px; color: var(--teal); }

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

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(14.4px, 1.9vw, 27.2px);
  font-size: var(--text-sm);
}

.nav-list a {
  position: relative;
  display: inline-block;
  white-space: nowrap;
  padding: 14.4px 0;
  color: var(--ink-soft);
  letter-spacing: 0.04em;
  transition: color var(--dur) var(--ease);
}
.nav-list a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 8px;
  width: 100%;
  height: 1px;
  background: var(--teal);
  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: 5px; }
.nav-list .dropdown > a::after { bottom: 6px; }
.nav-list .caret {
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-top: -3px;
  border-right: 1.4px solid currentColor;
  border-bottom: 1.4px 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: -18px;
  top: 100%;
  z-index: var(--z-menu);
  min-width: 208px;
  max-height: 360px;
  overflow-y: auto;
  padding: 8px 6px;
  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: 8.8px 13.6px;
  border-radius: var(--radius);
  color: var(--ink-soft);
  font-size: var(--text-sm);
  line-height: 1.5;
  white-space: normal;
}
.dropdown-menu a::after { display: none; }
.dropdown-menu a:hover {
  background: var(--teal-soft);
  color: var(--teal-deep);
}

.header-note {
  flex-shrink: 0;
  font-family:'PingFang SC','Microsoft YaHei','Noto Sans SC',-apple-system,BlinkMacSystemFont,'Segoe UI',Arial,sans-serif;
  font-size: 10.88px;
  letter-spacing: 0.1em;
  color: var(--muted);
  border-left: 1px solid var(--line-strong);
  padding-left: 16px;
  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: 8px;
  min-height: 46px;
  padding: 10.4px 21.6px;
  border: 1px solid var(--teal);
  border-radius: var(--radius);
  background: var(--teal);
  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(--teal-deep); transform: translateY(-1px); }

.btn--ghost {
  background: transparent;
  color: var(--teal);
  border-color: var(--line-strong);
}
.btn--ghost:hover { background: var(--paper-raised); border-color: var(--teal); }

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

/* ---------- 章节标题 ---------- */
.section { padding-block: clamp(44px, 5vw, 68px); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px 32px;
  margin-bottom: clamp(28px, 3vw, 40px);
}

.section-title {
  position: relative;
  padding-left: 16.8px;
  font-size: clamp(24px, 2.4vw, 32px);
}
.section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.16em;
  bottom: 0.16em;
  width: 3px;
  background: var(--teal);
}

.section-title .num {
  display: inline-block;
  margin-right: 10.4px;
  font-family:'PingFang SC','Microsoft YaHei','Noto Sans SC',-apple-system,BlinkMacSystemFont,'Segoe UI',Arial,sans-serif;
  font-size: 0.68em;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--copper);
  vertical-align: 0.25em;
}

.section-lede {
  max-width: 64ch;
  margin-top: 14.4px;
  padding-left: 16.8px;
  color: var(--muted);
  font-size: var(--text-sm);
  line-height: 1.9;
}

.section-link {
  display: inline-flex;
  align-items: center;
  gap: 6.4px;
  font-size: var(--text-sm);
  color: var(--teal);
  border-bottom: 1px solid var(--teal-soft);
  padding-bottom: 3.2px;
  transition: border-color var(--dur) var(--ease);
}
.section-link:hover { border-color: var(--teal); }

.eyebrow {
  display: inline-block;
  font-family:'PingFang SC','Microsoft YaHei','Noto Sans SC',-apple-system,BlinkMacSystemFont,'Segoe UI',Arial,sans-serif;
  font-size: 11.2px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ---------- 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 1.6px 8.8px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: var(--paper-raised);
  color: var(--muted);
  font-size: 11.2px;
  letter-spacing: 0.08em;
  white-space: nowrap;
}
.tag--accent {
  background: var(--copper-soft);
  border-color: transparent;
  color: #7d4a2a;
}
.tag--teal {
  background: var(--teal-soft);
  border-color: transparent;
  color: var(--teal);
}

/* ---------- 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: 9.6px;
  padding: 17.6px 18.4px 20px;
}

.card-title {
  font-size: 17.92px;
  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: 9.6px;
  margin-top: auto;
  padding-top: 5.6px;
  font-family:'PingFang SC','Microsoft YaHei','Noto Sans SC',-apple-system,BlinkMacSystemFont,'Segoe UI',Arial,sans-serif;
  font-size: 10.88px;
  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: 78px;
  z-index: 20;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  padding: 13.6px 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: 8px;
  overflow-x: auto;
  padding-bottom: 2px;
  scrollbar-width: none;
}
.chip-row::-webkit-scrollbar { display: none; }

.chip {
  flex-shrink: 0;
  min-height: 36px;
  padding: 4.8px 15.2px;
  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(--teal); color: var(--teal); }
.chip[aria-pressed="true"] {
  background: var(--teal);
  border-color: var(--teal);
  color: var(--white);
}

.toolbar-right {
  display: flex;
  align-items: center;
  gap: 13.6px;
  margin-left: auto;
  font-size: var(--text-sm);
  color: var(--muted);
}

.count { font-family:'PingFang SC','Microsoft YaHei','Noto Sans SC',-apple-system,BlinkMacSystemFont,'Segoe UI',Arial,sans-serif; 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: 4.8px 32px 4.8px 13.6px;
  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: 12px;
  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: 7.2px;
  padding-block: 17.6px;
  font-family:'PingFang SC','Microsoft YaHei','Noto Sans SC',-apple-system,BlinkMacSystemFont,'Segoe UI',Arial,sans-serif;
  font-size: 11.2px;
  color: var(--muted);
  letter-spacing: 0.05em;
}
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--teal); }
.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: 15.2px 17.6px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}
.spec-table thead th {
  background: var(--teal);
  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(--teal);
  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: 24px;
  padding: 17.6px 4px;
  font-family: var(--font-serif);
  font-size: 16.8px;
  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(--teal);
  border-bottom: 1.5px solid var(--teal);
  transform: rotate(45deg);
  transition: transform var(--dur) var(--ease);
}
.faq-item[open] summary::after { transform: rotate(-135deg); }
.faq-item p {
  padding: 0 40px 20px 4px;
  color: var(--muted);
  font-size: var(--text-sm);
  line-height: 1.88;
}

/* ---------- 页脚 ---------- */
.site-footer {
  margin-top: var(--section-gap);
  background: var(--teal-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: 32px 40px;
  padding-block: 52px 36px;
}

.footer-col {
  flex: 1 1 180px;
  min-width: 170px;
}
.footer-col--brand { flex: 2 1 280px; max-width: 420px; }

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10.4px;
  margin-bottom: 16px;
  font-family: var(--font-serif);
  font-size: 21.6px;
  letter-spacing: 0.14em;
  color: var(--paper-raised);
}
.footer-brand svg { width: 32px; height: 32px; }

.footer-desc { max-width: 46ch; font-size: var(--text-sm); line-height: 1.9; }

.footer-nav-title {
  font-family:'PingFang SC','Microsoft YaHei','Noto Sans SC',-apple-system,BlinkMacSystemFont,'Segoe UI',Arial,sans-serif;
  font-size: 10.88px;
  letter-spacing: 0.2em;
  color: color-mix(in srgb, var(--paper-raised) 55%, transparent);
  margin-bottom: 13.6px;
}

.footer-nav {
  display: flex;
  flex-direction: column;
  gap: 7px;
  font-size: var(--text-sm);
  line-height: 1.6;
}
.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: 8px 24px;
  padding-block: 18.4px;
  border-top: 1px solid color-mix(in srgb, var(--paper-raised) 16%, transparent);
  font-family:'PingFang SC','Microsoft YaHei','Noto Sans SC',-apple-system,BlinkMacSystemFont,'Segoe UI',Arial,sans-serif;
  font-size: 10.88px;
  letter-spacing: 0.04em;
  color: color-mix(in srgb, var(--paper-raised) 55%, transparent);
}

/* ---------- 工具类 ---------- */
.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; }

@media (max-width: 960px) {
  .header-note { display: none; }
  .menu-toggle { display: inline-flex; }
  .site-nav {
    position: fixed;
    inset: 78px 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: 8px var(--gutter) 24px;
    font-size: var(--text-base);
  }
  .nav-list a { padding: 13.6px 0; border-bottom: 1px solid var(--line); }
  .nav-list a::after { display: none; }
  .nav-list a[aria-current="page"] { color: var(--teal); }

  .nav-list .dropdown { display: block; }
  .nav-list .dropdown > a { justify-content: space-between; }
  .nav-list .caret { display: none; }
  .dropdown-menu {
    position: static;
    max-height: none;
    padding: 0 0 6px 14px;
    border: 0;
    box-shadow: none;
    background: transparent;
  }
  .nav-list .dropdown:hover > .dropdown-menu,
  .dropdown-menu { display: block; }
  .dropdown-menu a { padding: 8px 0; border-bottom: 0; color: var(--muted); }

  .footer-inner { flex-direction: column; gap: 28px; }
  .footer-col, .footer-col--brand { flex: 1 1 auto; max-width: none; width: 100%; }
}

@media (max-width: 600px) {
  .header-inner { min-height: 68px; gap: 16px; }
  .logo { font-size: 18.4px; }
  .logo svg { width: 28px; height: 28px; }
  .site-nav { inset: 68px 0 0; }
  .toolbar { top: 68px; }
  .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;
  }
}