/* ============================================================
   金都安装 · 共享样式表 /assets/site.css
   1 基础重置  2 变量  3 中文排版  4 页头  5 页脚
   6 通用组件  7 图片容器  8 响应式  9 无障碍动效
   ============================================================ */

/* ---------- 1 基础重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }

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

body,
h1, h2, h3, h4, h5, p, ul, ol, li, figure, figcaption, blockquote, dl, dd {
  margin: 0;
}

ul[class], ol[class] { list-style: none; padding: 0; }

img, svg, picture, video { display: block; max-width: 100%; }

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

a { color: inherit; }

:focus-visible {
  outline: 2px solid #B23F28;
  outline-offset: 3px;
  border-radius: 1px;
}

/* ---------- 2 变量 ---------- */
:root {
  /* 色彩 */
  --ink: #14253F;
  --indigo: #1E3A66;
  --indigo-mid: #3C5F97;
  --line: #B9C7DE;
  --brick: #B23F28;
  --brick-deep: #993322;
  --brick-soft: #D98A70;
  --sand: #F2E7D6;
  --paper: #FBF7F0;
  --mist: #CFE1DE;
  --graphite: #4A5464;

  /* 尺度 */
  --shell-w: 1180px;
  --gutter: clamp(18px, 4vw, 52px);
  --rule: 1px solid var(--line);

  /* 字体 */
  --font-body: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans SC", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    "Liberation Mono", monospace;

  /* 动效 */
  --ease: cubic-bezier(.2, .7, .3, 1);
  --dur: 160ms;
}

/* ---------- 3 中文排版与页面底 ---------- */
body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  background-color: var(--paper);
  background-image: radial-gradient(rgba(20, 37, 63, .05) 1px, transparent 1px);
  background-size: 22px 22px;
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--brick-soft); color: #fff; }

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .02em;
}

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

/* ---------- 4 页头 ---------- */
.skip-link {
  position: absolute;
  left: 14px;
  top: -72px;
  z-index: 200;
  display: inline-block;
  padding: 10px 20px;
  background: var(--brick);
  color: #fff;
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  border-radius: 2px;
  transition: top var(--dur) var(--ease);
}
.skip-link:focus { top: 14px; }

.site-header {
  position: relative;
  background: var(--paper);
  border-bottom: var(--rule);
}

/* 刊头信息条 */
.header-meta {
  background: var(--ink);
  color: var(--mist);
  font-size: 12px;
  letter-spacing: .07em;
}
.header-meta__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  min-height: 40px;
  padding-block: 6px;
}
.header-meta__issue {
  display: flex;
  align-items: baseline;
  gap: 10px;
  line-height: 1.5;
}
.header-meta__issue .mono {
  color: var(--brick-soft);
  font-size: 12.5px;
}
.header-meta__links {
  display: flex;
  align-items: center;
  gap: 22px;
}
.meta-link {
  color: var(--mist);
  text-decoration: none;
  padding-bottom: 1px;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.meta-link:hover,
.meta-link:focus-visible {
  color: #FFFFFF;
  border-bottom-color: var(--brick-soft);
}

/* 报头 */
.masthead {
  text-align: center;
  padding-block: clamp(30px, 4.4vw, 58px) clamp(16px, 2.4vw, 28px);
}
.masthead__brand {
  display: inline-block;
  text-decoration: none;
  color: var(--ink);
}
.masthead__name {
  display: block;
  font-size: clamp(42px, 7.6vw, 104px);
  font-weight: 200;
  line-height: .92;
  letter-spacing: -.02em;
  transition: color var(--dur) var(--ease);
}
.masthead__brand:hover .masthead__name { color: var(--brick); }
.masthead__sub {
  display: block;
  margin-top: clamp(8px, 1.2vw, 14px);
  font-size: clamp(10px, 1.1vw, 12px);
  font-weight: 500;
  letter-spacing: .52em;
  text-indent: .52em;
  color: var(--graphite);
}
.masthead__tagline {
  max-width: 46ch;
  margin: clamp(14px, 2vw, 22px) auto 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--graphite);
}

/* 栏目导航 */
.site-nav {
  border-top: var(--rule);
  border-bottom: var(--rule);
  background: rgba(242, 231, 214, .55);
}
.site-nav__inner {
  display: flex;
  align-items: center;
  gap: 20px;
  justify-content: center;
}
.nav-note {
  flex: 0 0 auto;
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--graphite);
  white-space: nowrap;
}
.nav-note .mono {
  color: var(--brick);
  font-weight: 500;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2.2vw, 32px);
  margin-inline: auto;
}
.nav-list__item { flex: 0 0 auto; }

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding-block: 15px;
  font-size: 14.5px;
  letter-spacing: .01em;
  color: var(--indigo);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 2px;
  background: var(--brick);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 180ms var(--ease);
}
.nav-link:hover { color: var(--brick); }
.nav-link:hover::after { transform: scaleX(1); }
.nav-link[aria-current="page"] {
  color: var(--brick);
  font-weight: 500;
}
.nav-link[aria-current="page"]::after { transform: scaleX(1); }

.nav-link__idx {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0;
  color: var(--indigo-mid);
}
.nav-link[aria-current="page"] .nav-link__idx { color: var(--brick-soft); }

.nav-cta {
  flex: 0 0 auto;
  display: inline-block;
  padding: 10px 18px;
  background: var(--brick);
  color: #FFFFFF;
  font-size: 13.5px;
  font-weight: 500;
  letter-spacing: .02em;
  text-decoration: none;
  border-radius: 2px;
  white-space: nowrap;
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.nav-cta:hover {
  background: var(--brick-deep);
  transform: translateY(-2px);
}

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 8px 12px;
  background: rgba(251, 247, 240, .8);
  border: 1px solid var(--line);
  border-radius: 2px;
  color: var(--indigo);
  font-size: 13px;
  letter-spacing: .08em;
}
.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: background var(--dur) var(--ease);
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: transform 180ms var(--ease);
}
.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }
.site-nav[data-open] .nav-toggle__bars { background: transparent; }
.site-nav[data-open] .nav-toggle__bars::before { transform: translateY(6px) rotate(45deg); }
.site-nav[data-open] .nav-toggle__bars::after { transform: translateY(-6px) rotate(-45deg); }
.nav-toggle__label { line-height: 1; }

/* ---------- 5 页脚 ---------- */
.site-footer {
  margin-top: clamp(48px, 7vw, 100px);
  background: var(--ink);
  color: #DCE5F2;
  border-top: 4px solid var(--brick);
}
.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: clamp(24px, 3vw, 44px);
  padding-block: clamp(36px, 4.6vw, 60px) clamp(24px, 3vw, 38px);
}
.footer-brand { max-width: 32ch; }
.footer-brand__name {
  display: inline-block;
  font-size: clamp(26px, 3vw, 36px);
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: -.01em;
  color: #FFFFFF;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease);
}
.footer-brand__name:hover { border-bottom-color: var(--brick-soft); }
.footer-brand__sub {
  margin-top: 10px;
  font-size: 11.5px;
  letter-spacing: .34em;
  color: var(--mist);
}
.footer-brand__note {
  margin-top: 18px;
  font-size: 13.5px;
  line-height: 1.75;
  color: #9FB2CE;
}

.footer-col { display: block; }
.footer-col__title {
  margin-bottom: 14px;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .26em;
  color: var(--brick-soft);
}
.footer-col__list { display: grid; gap: 10px; }
.footer-link {
  font-size: 14px;
  color: #DCE5F2;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.footer-link:hover,
.footer-link:focus-visible {
  color: #FFFFFF;
  border-bottom-color: var(--brick-soft);
}

.footer-contact {
  display: grid;
  gap: 6px;
  padding-block: 20px;
  border-top: 1px solid rgba(185, 199, 222, .24);
}
.footer-contact__line {
  font-size: 12.5px;
  line-height: 1.8;
  color: #9FB2CE;
}
.footer-contact__line .mono { color: #DCE5F2; }

.footer-legal {
  border-top: 1px solid rgba(185, 199, 222, .24);
  background: rgba(0, 0, 0, .18);
}
.footer-legal__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-block: 16px;
  font-size: 12px;
  color: #8FA3C0;
}
.footer-legal__copy { margin: 0; }
.footer-legal__mark {
  margin: 0;
  font-family: var(--font-mono);
  letter-spacing: .1em;
  color: #6F87A8;
}

/* ---------- 6 通用组件 ---------- */
/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 26px;
  font-size: 15px;
  font-weight: 500;
  line-height: 1.4;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 2px;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease),
    border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.btn--primary { background: var(--brick); color: #FFFFFF; }
.btn--primary:hover { background: var(--brick-deep); transform: translateY(-2px); }
.btn--ink { background: var(--ink); color: #FFFFFF; }
.btn--ink:hover { background: var(--indigo); transform: translateY(-2px); }
.btn--ghost {
  background: transparent;
  color: var(--indigo);
  border-color: var(--line);
}
.btn--ghost:hover { background: var(--sand); border-color: var(--indigo-mid); }

/* 面包屑 */
.breadcrumb { margin-block: clamp(18px, 2.4vw, 28px); }
.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--graphite);
}
.breadcrumb__item {
  display: flex;
  align-items: center;
  gap: 8px;
}
.breadcrumb__item:not(:last-child)::after {
  content: "／";
  color: var(--line);
}
.breadcrumb__link {
  color: var(--indigo-mid);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.breadcrumb__link:hover {
  color: var(--brick);
  border-bottom-color: var(--brick-soft);
}
.breadcrumb__current { color: var(--ink); }

/* 页面头部 */
.page-head { padding-block: clamp(16px, 2.6vw, 32px) clamp(14px, 2vw, 24px); }
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--brick);
}
.eyebrow::before {
  content: "";
  display: block;
  width: 26px;
  height: 1px;
  background: var(--brick);
}
.page-title {
  font-size: clamp(34px, 6vw, 76px);
  font-weight: 200;
  line-height: 1.02;
  letter-spacing: -.02em;
  color: var(--ink);
}
.page-lede {
  max-width: 62ch;
  margin-top: 18px;
  font-size: 17px;
  line-height: 1.8;
  color: var(--graphite);
}
.section-title {
  font-size: clamp(22px, 2.6vw, 34px);
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: -.01em;
  color: var(--ink);
}

/* 网格 */
.grid { display: grid; gap: clamp(20px, 3vw, 36px); }
.grid--main { grid-template-columns: minmax(0, 7fr) minmax(0, 4fr); }
.grid--thirds { grid-template-columns: repeat(3, minmax(0, 1fr)); }

/* 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--indigo);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 2px;
}
.tag--brick { background: var(--brick); border-color: var(--brick); color: #FFFFFF; }
.tag--soft { background: rgba(217, 138, 112, .24); border-color: var(--brick-soft); color: #8E3320; }
.tag--mist { background: var(--mist); border-color: #B3CBC7; color: #20453F; }

/* 提示条 */
.notice {
  padding: 16px 20px;
  background: var(--mist);
  border-left: 3px solid var(--brick);
  font-size: 14.5px;
  line-height: 1.75;
  color: #1B3733;
}
.notice__title {
  margin-bottom: 4px;
  font-weight: 500;
  color: var(--ink);
}

/* 分段控件 */
.segmented {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0;
  padding: 3px;
  background: var(--sand);
  border: 1px solid var(--line);
  border-radius: 2px;
}
.segmented__btn {
  padding: 9px 18px;
  font-size: 14px;
  color: var(--indigo);
  border-radius: 2px;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}
.segmented__btn:hover { background: rgba(185, 199, 222, .35); }
.segmented__btn[aria-selected="true"] {
  background: var(--ink);
  color: #FFFFFF;
  font-weight: 500;
}
.segmented__panel { padding-top: 24px; }
.segmented__panel[hidden] { display: none; }

/* 折叠块 */
.fold { border-bottom: var(--rule); }
.fold:first-of-type { border-top: var(--rule); }
.fold__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 4px;
  font-size: 16px;
  font-weight: 500;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}
.fold__summary::-webkit-details-marker { display: none; }
.fold__summary::after {
  content: "＋";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--brick);
}
.fold[open] > .fold__summary::after { content: "－"; }
.fold__body {
  padding: 0 4px 20px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--graphite);
}

/* ---------- 7 图片容器基础规则 ---------- */
.media {
  position: relative;
  overflow: hidden;
  background: var(--sand);
  border: 1px solid var(--line);
  box-shadow: 0 1px 0 rgba(20, 37, 63, .04);
}
.media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    135deg,
    rgba(20, 37, 63, .045) 0 1px,
    transparent 1px 7px
  );
}
.media img,
.media svg { display: block; width: 100%; height: auto; }
.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--screen { aspect-ratio: 16 / 10; }
.media--16x9 > img,
.media--4x3 > img,
.media--screen > img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media__caption {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--graphite);
}

/* ---------- 8 响应式 ---------- */
@media (max-width: 1024px) {
  .footer-top { grid-template-columns: 1.4fr 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  .nav-note { display: none; }
  .nav-toggle { display: inline-flex; order: 1; }
  .nav-cta { order: 2; margin: 0; }
  .nav-list {
    order: 3;
    flex-basis: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin: 0;
    display: none;
    border-top: 1px solid var(--line);
  }
  .site-nav[data-open] .nav-list { display: flex; }
  .site-nav__inner {
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 10px;
    padding-block: 10px;
  }
  .nav-link {
    width: 100%;
    padding: 14px 6px;
    gap: 12px;
    font-size: 15px;
    border-bottom: 1px solid rgba(185, 199, 222, .6);
  }
  .nav-link::after { display: none; }
  .nav-link[aria-current="page"] { background: rgba(178, 63, 40, .08); }
  .nav-link:last-child,
  .nav-list__item:last-child .nav-link { border-bottom: 0; }

  .grid--main { grid-template-columns: minmax(0, 1fr); }
  .grid--thirds { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 700px) {
  .header-meta__inner { justify-content: flex-start; gap: 10px; }
  .header-meta__links { gap: 16px; }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .page-lede { font-size: 16px; }
}

@media (max-width: 520px) {
  .footer-top { grid-template-columns: 1fr; gap: 28px; }
  .grid--thirds { grid-template-columns: minmax(0, 1fr); }
  .nav-toggle { padding: 8px 10px; }
  .nav-cta { padding: 9px 14px; font-size: 13px; }
  .btn { width: 100%; justify-content: center; }
}

/* ---------- 9 显现动效与无障碍 ---------- */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 200ms var(--ease), transform 200ms var(--ease);
}
html.js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
  html.js [data-reveal] { opacity: 1; transform: none; }
  .nav-link:hover::after,
  .nav-link[aria-current="page"]::after { transform: scaleX(1); }
}