/* 夜景摄影 · 组件 */
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 20px); }
body {
  font-family:'PingFang SC','Microsoft YaHei','Noto Sans SC',-apple-system,BlinkMacSystemFont,'Segoe UI',Arial,sans-serif;
  font-size: var(--fs-md);
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; height: auto; }
ul, ol { list-style: none; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 3px; border-radius: 4px; }
.container { width: min(var(--container), 100% - 40px); margin-inline: auto; }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(7, 14, 30, .88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; gap: clamp(14px, 2.4vw, 30px); height: var(--header-h); }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); }
.brand-mark { width: 28px; height: 28px; color: var(--accent); flex: none; }
.brand-name { font-family: var(--font-serif); font-size: 17px; font-weight: 700; letter-spacing: .04em; white-space: nowrap; }
.nav ul { display: flex; gap: clamp(10px, 1.6vw, 22px); }
.nav a { font-size: var(--fs-sm); color: var(--text-dim); padding: 6px 2px; border-bottom: 2px solid transparent; transition: color .15s; white-space: nowrap; }
.nav a:hover { color: var(--text); }
.nav li[aria-current="page"] a { color: var(--accent); border-bottom-color: var(--accent); }
.header-actions { margin-left: auto; display: flex; gap: 6px; }
.header-actions button { width: 36px; height: 36px; display: grid; place-items: center; border-radius: 8px; color: var(--text-dim); transition: color .15s, background .15s; }
.header-actions button:hover { color: var(--text); background: var(--card); }
.header-actions svg { width: 18px; height: 18px; }
.menu-toggle { display: none; }

/* 搜索 */
.search-inner { padding: 14px 0 16px; }
.search-inner input {
  width: 100%; padding: 10px 14px; font: inherit; color: var(--text);
  background: var(--card); border: 1px solid var(--line-strong); border-radius: 10px;
}
.search-inner input::placeholder { color: var(--text-faint); }
.search-results { margin-top: 10px; display: grid; gap: 6px; max-height: 300px; overflow: auto; }
.search-results a { display: flex; justify-content: space-between; gap: 16px; padding: 8px 12px; border-radius: 8px; background: var(--card); border: 1px solid var(--line); }
.search-results a:hover { border-color: var(--accent); }
.search-results strong { font-size: var(--fs-sm); font-weight: 600; }
.search-results span { font-size: var(--fs-xs); color: var(--text-faint); white-space: nowrap; }
.search-empty { padding: 10px 12px; font-size: var(--fs-sm); color: var(--text-dim); }

/* ---------- 通用 ---------- */
.eyebrow { font-family:'PingFang SC','Microsoft YaHei','Noto Sans SC',-apple-system,BlinkMacSystemFont,'Segoe UI',Arial,sans-serif; font-size: var(--fs-xs); letter-spacing: .18em; color: var(--accent); text-transform: uppercase; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 10px 20px; border-radius: 999px; font-size: var(--fs-sm); font-weight: 600; transition: transform .15s, background .15s, border-color .15s; }
.btn--primary { background: var(--accent); color: var(--accent-ink); }
.btn--primary:hover { background: #ffb76e; transform: translateY(-1px); }
.btn--ghost { border: 1px solid var(--line-strong); color: var(--text); }
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); }
.text-link { display: inline-block; margin-top: 10px; font-size: var(--fs-sm); color: var(--accent); }
.text-link:hover { text-decoration: underline; }
.meta { font-size: var(--fs-xs); color: var(--text-faint); }
.section-head--line { display: flex; align-items: baseline; gap: 18px; margin-bottom: 10px; }
.section-head--line .eyebrow { flex: none; }
.section-line-text { min-width: 0; }
.section-line-text h2 { font-family: var(--font-serif); font-size: var(--fs-lg); font-weight: 600; line-height: 1.4; }
.section-line-text .section-lead { margin-top: 2px; font-size: var(--fs-sm); color: var(--text-dim); }

/* ---------- 卡片 ---------- */
.note-card { display: flex; flex-direction: column; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; transition: transform .18s, border-color .18s, box-shadow .18s; }
.note-card:hover { transform: translateY(-3px); border-color: var(--line-strong); box-shadow: var(--shadow-s); }
.note-media { display: block; aspect-ratio: 2 / 1; overflow: hidden; background: var(--bg-2); }
.note-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .3s; }
.note-card:hover .note-media img { transform: scale(1.04); }
.note-body { padding: 10px 12px 12px; display: grid; gap: 4px; }
.note-card h3 { font-size: 14px; line-height: 1.45; font-weight: 600; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.note-card p { font-size: var(--fs-xs); line-height: 1.6; color: var(--text-dim); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.note-meta { font-size: var(--fs-xs); color: var(--text-faint); }
.pick-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; transition: transform .18s, border-color .18s; }
.pick-card:hover { transform: translateY(-3px); border-color: var(--line-strong); }
.pick-media { display: block; aspect-ratio: 16 / 9; overflow: hidden; background: var(--bg-2); }
.pick-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .3s; }
.pick-card:hover .pick-media img { transform: scale(1.04); }
.pick-body { padding: 11px 13px 13px; display: grid; gap: 5px; }
.pick-card h3 { font-size: 15px; line-height: 1.45; font-weight: 600; }
.pick-card h3 a:hover { color: var(--accent); }
.pick-card p { font-size: var(--fs-xs); color: var(--text-dim); line-height: 1.6; }

/* ---------- 表格 / 清单 / FAQ ---------- */
.params-table { width: 100%; border-collapse: collapse; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; font-size: var(--fs-sm); }
.params-table th, .params-table td { padding: 8px 12px; text-align: left; border-bottom: 1px solid var(--line); }
.params-table thead th { font-size: var(--fs-xs); letter-spacing: .08em; color: var(--accent); background: var(--card-2); }
.params-table tbody th { font-weight: 600; white-space: nowrap; }
.params-table td { color: var(--text-dim); }
.params-table td:nth-child(2), .params-table td:nth-child(3), .params-table td:nth-child(4) { font-family:'PingFang SC','Microsoft YaHei','Noto Sans SC',-apple-system,BlinkMacSystemFont,'Segoe UI',Arial,sans-serif; font-size: 12.5px; color: var(--text); }
.params-table tbody tr:last-child th, .params-table tbody tr:last-child td { border-bottom: 0; }
.table-wrap { overflow-x: auto; }

.care-col { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 10px 13px; min-width: 0; }
.care-col h2 { font-family: var(--font-serif); font-size: var(--fs-lg); margin-bottom: 2px; }
.col-lead { font-size: var(--fs-xs); color: var(--text-faint); margin-bottom: 8px; }
.check-list li + li { border-top: 1px solid var(--line); }
.check-item { position: relative; display: flex; gap: 8px; align-items: flex-start; padding: 3px 0; }
.check-item input { position: absolute; opacity: 0; width: 18px; height: 18px; margin: 0; cursor: pointer; }
.check-box { flex: none; width: 18px; height: 18px; margin-top: 3px; border: 1.5px solid var(--line-strong); border-radius: 5px; transition: background .15s, border-color .15s; pointer-events: none; }
.check-box::after { content: ""; display: block; width: 9px; height: 5px; margin: 4px auto 0; border-left: 2px solid var(--accent-ink); border-bottom: 2px solid var(--accent-ink); transform: rotate(-45deg) scale(0); transition: transform .15s; }
.check-item input:checked + .check-box { background: var(--accent); border-color: var(--accent); }
.check-item input:checked + .check-box::after { transform: rotate(-45deg) scale(1); }
.check-item input:focus-visible + .check-box { outline: 2px solid var(--focus); outline-offset: 2px; }
.check-item strong { font-size: var(--fs-sm); font-weight: 600; display: block; }
.check-desc { display: block; font-size: 10.5px; color: var(--text-dim); line-height: 1.45; display: -webkit-box; -webkit-line-clamp: 1; -webkit-box-orient: vertical; overflow: hidden; }
.checklist-note { margin-top: 8px; font-size: var(--fs-xs); color: var(--text-faint); }
.checklist-note span { color: var(--accent); }

.faq-list { display: grid; gap: 2px; }
.faq-item { border-top: 1px solid var(--line); }
.faq-item:last-child { border-bottom: 1px solid var(--line); }
.faq-item summary { list-style: none; cursor: pointer; display: flex; justify-content: space-between; align-items: center; gap: 10px; padding: 5px 0; font-size: 12px; font-weight: 600; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; flex: none; width: 20px; height: 20px; display: grid; place-items: center; border: 1px solid var(--line-strong); border-radius: 50%; color: var(--accent); font-weight: 400; transition: transform .2s; }
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item p { padding: 0 0 7px; font-size: 10.5px; color: var(--text-dim); line-height: 1.5; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }

/* ---------- 分类页 ---------- */
.breadcrumb ol { display: flex; flex-wrap: wrap; gap: 6px; font-size: var(--fs-xs); color: var(--text-faint); margin-bottom: 12px; }
.breadcrumb li + li::before { content: "/"; margin-right: 6px; color: var(--line-strong); }
.breadcrumb a:hover { color: var(--accent); }
.page-hero { padding: 26px 0 20px; border-bottom: 1px solid var(--line); background: linear-gradient(180deg, var(--bg-2), var(--bg)); }
.page-hero h1 { font-family: var(--font-serif); font-size: var(--fs-2xl); line-height: 1.3; margin-top: 6px; }
.page-lead { margin-top: 8px; max-width: 40em; color: var(--text-dim); font-size: var(--fs-md); }
.article-meta { margin-top: 8px; font-size: var(--fs-xs); color: var(--text-faint); }

.chip { padding: 6px 14px; border-radius: 999px; border: 1px solid var(--line-strong); font-size: var(--fs-sm); color: var(--text-dim); transition: all .15s; }
.chip:hover { color: var(--text); border-color: var(--accent); }
.chip[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); font-weight: 600; }
.filter-bar { position: sticky; top: var(--header-h); z-index: 40; background: rgba(10, 20, 40, .92); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.filter-inner { display: flex; align-items: center; gap: 14px; padding: 10px 0; flex-wrap: wrap; }
.chips { display: flex; gap: 8px; flex-wrap: wrap; }
.filter-side { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.sort-label { font-size: var(--fs-xs); color: var(--text-faint); cursor: pointer; }
.filter-side select { font: inherit; font-size: var(--fs-sm); color: var(--text); background: var(--card); border: 1px solid var(--line-strong); border-radius: 8px; padding: 5px 10px; }
.result-count { font-size: var(--fs-xs); color: var(--text-faint); white-space: nowrap; }

.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; counter-reset: step; }
.step { display: flex; gap: 12px; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; }
.step-num { font-family:'PingFang SC','Microsoft YaHei','Noto Sans SC',-apple-system,BlinkMacSystemFont,'Segoe UI',Arial,sans-serif; font-size: var(--fs-lg); color: var(--accent); line-height: 1.2; }
.step h3 { font-size: var(--fs-md); margin-bottom: 2px; }
.step p { font-size: var(--fs-xs); color: var(--text-dim); line-height: 1.6; }

.cat-desc { border-top: 1px solid var(--line); background: var(--bg-2); }
.cat-desc h2 { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
.cat-desc p { font-size: var(--fs-sm); color: var(--text-dim); line-height: 1.9; max-width: 72em; }

.continue-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.continue-card { display: grid; gap: 6px; padding: 14px 16px; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); transition: border-color .15s, transform .15s; }
.continue-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.continue-tag { font-family:'PingFang SC','Microsoft YaHei','Noto Sans SC',-apple-system,BlinkMacSystemFont,'Segoe UI',Arial,sans-serif; font-size: var(--fs-xs); color: var(--accent); }
.continue-card strong { font-size: var(--fs-sm); line-height: 1.5; }
.continue-card > span:last-child { font-size: var(--fs-xs); color: var(--text-faint); }
.continue-note { margin-top: 12px; font-size: var(--fs-xs); color: var(--text-faint); }

/* ---------- 详情页 ---------- */
.progress-track { position: sticky; top: var(--header-h); height: 3px; background: var(--line); z-index: 30; }
.progress-bar { height: 100%; width: 0; background: linear-gradient(90deg, var(--blue), var(--accent)); transition: width .1s linear; }
.article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 240px; gap: 40px; padding: 34px 0 44px; align-items: start; }
.article-body { min-width: 0; font-size: 15px; }
.article-body h2 { font-family: var(--font-serif); font-size: var(--fs-xl); margin: 34px 0 12px; scroll-margin-top: calc(var(--header-h) + 24px); }
.article-body h2:first-child { margin-top: 0; }
.article-body p { color: var(--text-dim); }
.article-body p + p { margin-top: 12px; }
.article-toc { position: sticky; top: calc(var(--header-h) + 24px); display: grid; gap: 14px; }
.toc { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; }
.toc h2 { font-size: var(--fs-sm); color: var(--text-faint); margin-bottom: 8px; }
.toc ol { display: grid; gap: 6px; }
.toc a { font-size: var(--fs-sm); color: var(--text-dim); display: inline-block; padding: 3px 0 3px 12px; border-left: 2px solid var(--line); transition: color .15s, border-color .15s; }
.toc a:hover { color: var(--text); }
.toc a.is-active { color: var(--accent); border-left-color: var(--accent); }

/* ---------- 页脚 ---------- */
.site-footer { border-top: 1px solid var(--line); background: #061024; }
.footer-grid { display: flex; flex-wrap: wrap; gap: 10px 34px; padding: 14px 0 8px; align-items: flex-start; }
.footer-brand { flex: 1 1 300px; max-width: 420px; }
.footer-brand p { margin-top: 4px; font-size: var(--fs-xs); color: var(--text-faint); line-height: 1.6; }
.footer-col h3 { font-size: var(--fs-xs); letter-spacing: .1em; color: var(--text-faint); margin-bottom: 4px; }
.footer-col ul { display: flex; flex-wrap: wrap; gap: 2px 16px; }
.footer-col a, .footer-col li { font-size: var(--fs-sm); color: var(--text-dim); }
.footer-col a:hover { color: var(--accent); }
.footer-col--plain p { font-size: var(--fs-sm); color: var(--text-dim); max-width: 22em; }
.footer-bottom { display: flex; flex-wrap: wrap; gap: 4px 18px; padding: 8px 0 12px; border-top: 1px solid var(--line); font-size: var(--fs-xs); color: var(--text-faint); }

/* ---------- 移动 ---------- */
@media (max-width: 1020px) {
  .menu-toggle { display: grid; }
  .nav { position: absolute; top: 100%; inset-inline: 0; background: rgba(7, 14, 30, .98); border-bottom: 1px solid var(--line); display: none; }
  .nav.is-open { display: block; }
  .nav ul { flex-direction: column; gap: 0; padding: 8px 20px 14px; }
  .nav li + li { border-top: 1px solid var(--line); }
  .nav a { display: block; padding: 11px 0; }
  .article-layout { grid-template-columns: 1fr; }
  .article-toc { position: static; }
  .steps { grid-template-columns: 1fr; }
  .continue-grid { grid-template-columns: 1fr; }
  .filter-side { margin-left: 0; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
  html { scroll-behavior: auto; }
}

/* ============================================================
   对接数据补充：导航下拉 / 页脚 flex 四栏 / 分页 / 上下篇
   ============================================================ */

/* 导航下拉（hover 展开，固定高度可滚动） */
.nav > ul > li { position: relative; }
.nav > ul > li > a { white-space: nowrap; }
.nav > ul > li.has-sub > a::after {
  content: "";
  display: inline-block;
  width: 5px;
  height: 5px;
  margin-left: 4px;
  vertical-align: 2px;
  border-right: 1.4px solid currentColor;
  border-bottom: 1.4px solid currentColor;
  transform: rotate(45deg);
  opacity: 0.55;
}
.nav-sub {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  left: -12px;
  z-index: 120;
  min-width: 15rem;
  max-height: 384px;
  overflow-y: auto;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card, #0a1428);
  box-shadow: 0 14px 36px -18px rgba(0, 0, 0, 0.7);
}
.nav > ul > li:hover > .nav-sub { display: block; }
.nav-sub a {
  display: block;
  padding: 7px 10px;
  border-radius: 6px;
  font-size: var(--fs-sm);
  color: var(--text-dim);
  white-space: normal;
}
.nav-sub a:hover { background: rgba(242, 169, 92, 0.14); color: var(--text); }

/* 页脚：四栏一行 */
.footer-grid > .footer-col { flex: 1 1 170px; min-width: 160px; }
.footer-grid > .footer-brand { flex: 1.7 1 260px; }
@media (max-width: 520px) {
  .footer-grid { flex-direction: column; }
}

/* 分页 */
.pager {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 26px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: var(--fs-sm);
}
.pager a,
.pager span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 34px;
  height: 34px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--text-dim);
  background: var(--card);
}
.pager a:hover { border-color: var(--accent); color: var(--text); }
.pager .pager-current { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); font-weight: 600; }
.pager .pager-gap { border: 0; background: transparent; }

/* 上一篇 / 下一篇：同一行左右分布 */
.article-nav {
  display: flex;
  flex-wrap: nowrap;
  gap: 12px;
  margin-top: 30px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}
.article-nav a {
  flex: 1 1 0;
  min-width: 0;
  max-width: calc(50% - 6px);
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card);
  transition: border-color .15s;
}
.article-nav a:hover { border-color: var(--accent); }
.article-nav .nav-label {
  display: block;
  margin-bottom: 4px;
  font-size: var(--fs-xs);
  letter-spacing: 0.1em;
  color: var(--text-faint);
}
.article-nav h3 { font-size: var(--fs-sm); font-weight: 600; line-height: 1.55; color: var(--text); }
.article-nav .nav-next { margin-left: auto; text-align: right; }
.article-nav .nav-next .nav-label { text-align: right; }

@media (max-width: 860px) {
  .nav-sub { display: none !important; }
  .nav > ul > li.has-sub > a::after { display: none; }
}
@media (max-width: 620px) {
  .article-nav { flex-wrap: wrap; }
  .article-nav a { flex: 1 1 100%; max-width: 100%; }
  .article-nav .nav-next { margin-left: 0; }
}