/* =========================================================
   /assets/site.css — 澳门新京葡中文站 共享外壳
   深海蓝海港夜色 · 鎏金坐标 · 珊瑚橙状态
   ========================================================= */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 20px);
}

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

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

img, svg, video, canvas { display: block; max-width: 100%; }
button, input, textarea, select { font: inherit; color: inherit; }

[hidden] { display: none !important; }

/* ---------- 变量 ---------- */
:root {
  --deep: #0B2239;
  --teal: #0F3B4C;
  --gold: #D9A441;
  --coral: #F26B4E;
  --sage: #A8B7A6;
  --cream: #F6F1E7;
  --ink: #101820;
  --mist: #DCE8F0;
  --green: #2F7D5C;
  --amber: #8A5A2B;
  --red: #B23A3A;

  --header-h: 78px;
  --shell: 1180px;
  --gutter: clamp(18px, 4vw, 46px);

  --font-display: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Source Han Sans SC", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Source Han Sans SC", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "Menlo", "Consolas", "Courier New", monospace;

  --shadow-hard: 8px 8px 0 rgba(11, 34, 57, 0.82);
  --shadow-soft: 8px 8px 0 rgba(11, 34, 57, 0.16);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 基础排版 ---------- */
body {
  font-family: var(--font-body);
  font-size: clamp(16px, 0.35vw + 15px, 17.5px);
  line-height: 1.85;
  color: var(--ink);
  background: var(--cream);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -0.01em;
}

a { color: inherit; }

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

#main-content { padding-top: var(--header-h); }

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

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  inset-block-start: 8px;
  inset-inline-start: 8px;
  z-index: 1200;
  padding: 10px 18px;
  background: var(--gold);
  color: var(--deep);
  font-weight: 900;
  font-size: 14px;
  letter-spacing: 0.06em;
  text-decoration: none;
  border: 2px solid var(--deep);
  transform: translateY(-160%);
  transition: transform 0.2s var(--ease);
}
.skip-link:focus-visible { transform: translateY(0); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  padding: 0.82em 1.35em;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.05em;
  line-height: 1.2;
  text-decoration: none;
  color: var(--ink);
  background: var(--cream);
  border: 2px solid var(--ink);
  box-shadow: 4px 4px 0 var(--ink);
  cursor: pointer;
  transition: transform 0.18s var(--ease), box-shadow 0.18s var(--ease),
    background-color 0.18s var(--ease), color 0.18s var(--ease);
}
.btn:hover { transform: translate(-2px, -2px); box-shadow: 6px 6px 0 var(--ink); }
.btn:active { transform: translate(2px, 2px); box-shadow: 2px 2px 0 var(--ink); }

.btn--gold {
  background: var(--gold);
  color: var(--deep);
  border-color: var(--deep);
  box-shadow: 4px 4px 0 var(--coral);
}
.btn--gold:hover { box-shadow: 6px 6px 0 var(--coral); }
.btn--gold:active { box-shadow: 2px 2px 0 var(--coral); }

.btn--ghost {
  background: transparent;
  color: var(--cream);
  border-color: var(--gold);
  box-shadow: none;
}
.btn--ghost:hover { background: rgba(217, 164, 65, 0.16); box-shadow: none; transform: none; }

.btn--sm { padding: 0.58em 1em; font-size: 13.5px; }
.btn--block { width: 100%; }

/* ---------- 头部 ---------- */
.site-header {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: 900;
  color: var(--cream);
  background: linear-gradient(
    180deg,
    rgba(11, 34, 57, 0.94) 0%,
    rgba(11, 34, 57, 0.66) 58%,
    rgba(11, 34, 57, 0) 100%
  );
  transition: background-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.site-header[data-stuck] {
  background-color: var(--deep);
  background-image:
    repeating-linear-gradient(
      115deg,
      rgba(217, 164, 65, 0.09) 0 2px,
      transparent 2px 26px
    );
  box-shadow: 0 3px 0 var(--gold), 0 22px 44px rgba(4, 14, 24, 0.5);
}

.header__bar { position: relative; }

.header__inner {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 34px);
  height: var(--header-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
  flex: 0 0 auto;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--deep);
  background: var(--gold);
  border: 2px solid var(--cream);
  box-shadow: 4px 4px 0 var(--coral);
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.brand:hover .brand__mark {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--coral);
}

.brand__text { display: grid; gap: 2px; }

.brand__name {
  font-family: var(--font-display);
  font-size: 17.5px;
  font-weight: 900;
  letter-spacing: 0.05em;
  line-height: 1.2;
}

.brand__tag {
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.24em;
  line-height: 1.2;
  color: var(--sage);
}

.primary-nav { margin-inline-start: auto; }

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(6px, 1.4vw, 24px);
}

.nav-link {
  position: relative;
  display: inline-block;
  padding: 10px 4px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.18s var(--ease);
}
.nav-link::after {
  content: "";
  position: absolute;
  inset-inline: 4px;
  inset-block-end: 3px;
  height: 2px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.22s var(--ease);
}
.nav-link:hover,
.nav-link:focus-visible { color: var(--gold); }
.nav-link:hover::after,
.nav-link:focus-visible::after { transform: scaleX(1); }

.nav-link[aria-current="page"] {
  color: var(--gold);
}
.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--coral);
}

.header__actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.header__cta { white-space: nowrap; }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 10px 12px;
  background: transparent;
  border: 2px solid var(--gold);
  color: var(--gold);
  font-size: 11.5px;
  font-weight: 800;
  letter-spacing: 0.2em;
  cursor: pointer;
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease);
}
.nav-toggle:hover { background: rgba(217, 164, 65, 0.16); }

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 20px;
  height: 2px;
  background: currentColor;
  transition: background-color 0.2s var(--ease);
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  width: 20px;
  height: 2px;
  background: currentColor;
  transition: transform 0.22s var(--ease);
}
.nav-toggle__bars::before { inset-block-start: -6px; }
.nav-toggle__bars::after { inset-block-start: 6px; }

.site-header[data-open] .nav-toggle__bars { background: transparent; }
.site-header[data-open] .nav-toggle__bars::before { transform: translateY(6px) rotate(45deg); }
.site-header[data-open] .nav-toggle__bars::after { transform: translateY(-6px) rotate(-45deg); }

.nav-toggle__label { line-height: 1; }

.header__progress {
  position: absolute;
  inset-block-end: 0;
  inset-inline-start: 0;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--gold) 0%, var(--coral) 100%);
  transition: width 0.1s linear;
}

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  overflow: hidden;
  background: var(--deep);
  color: var(--mist);
  padding-block: clamp(52px, 7vw, 90px) 28px;
}

.footer__contour {
  position: absolute;
  inset-block-end: 0;
  inset-inline: 0;
  height: 210px;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(
      115deg,
      rgba(217, 164, 65, 0.14) 0 2px,
      rgba(217, 164, 65, 0) 2px 24px
    ),
    repeating-linear-gradient(
      65deg,
      rgba(242, 107, 78, 0.1) 0 1px,
      rgba(242, 107, 78, 0) 1px 46px
    ),
    radial-gradient(120% 130% at 82% 100%, rgba(242, 107, 78, 0.22), rgba(11, 34, 57, 0) 62%);
}

.footer__inner { position: relative; z-index: 1; }

.footer__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.75fr) minmax(0, 1fr);
  gap: clamp(26px, 4vw, 58px);
  align-items: start;
}

.footer__brand {
  border-inline-start: 3px solid var(--gold);
  padding-inline-start: clamp(14px, 1.6vw, 22px);
}

.footer__mark {
  display: inline-grid;
  place-items: center;
  width: 42px;
  height: 42px;
  margin-block-end: 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--gold);
  border: 2px solid var(--gold);
  background: rgba(217, 164, 65, 0.1);
}

.footer__title {
  font-family: var(--font-display);
  font-size: clamp(22px, 2.2vw, 27px);
  font-weight: 900;
  letter-spacing: 0.03em;
  color: var(--cream);
  line-height: 1.2;
}

.footer__motto {
  margin-block-start: 8px;
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.26em;
  color: var(--sage);
}

.footer__hint {
  margin-block-start: 16px;
  max-width: 34ch;
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(220, 232, 240, 0.72);
}

.footer__label {
  margin-block-end: 16px;
  font-size: 11.5px;
  font-weight: 800;
  letter-spacing: 0.24em;
  color: var(--gold);
}

.footer__list {
  display: grid;
  gap: 11px;
}

.footer__link {
  display: inline-block;
  font-size: 14.5px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--mist);
  text-decoration: none;
  border-block-end: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.footer__link:hover,
.footer__link:focus-visible {
  color: var(--gold);
  border-block-end-color: var(--coral);
}

.footer__value {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(220, 232, 240, 0.82);
  word-break: break-word;
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

.footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  margin-block-start: clamp(34px, 5vw, 60px);
  padding-block-start: 20px;
  border-block-start: 1px solid rgba(220, 232, 240, 0.18);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: rgba(220, 232, 240, 0.66);
}

.footer__copy { font-weight: 700; }
.footer__icp { font-family: var(--font-mono); }
.footer__note { font-family: var(--font-mono); color: rgba(168, 183, 166, 0.86); }

/* ---------- 返回顶部 ---------- */
.backtop {
  position: fixed;
  inset-block-end: 22px;
  inset-inline-end: 22px;
  z-index: 800;
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  font-size: 19px;
  font-weight: 900;
  color: var(--deep);
  background: var(--gold);
  border: 2px solid var(--deep);
  box-shadow: 4px 4px 0 rgba(11, 34, 57, 0.62);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.24s var(--ease), transform 0.24s var(--ease),
    visibility 0.24s var(--ease), box-shadow 0.18s var(--ease);
}
.backtop[data-visible] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.backtop:hover { box-shadow: 6px 6px 0 var(--coral); }

/* ---------- 章节色带 ---------- */
.section { padding-block: clamp(52px, 7vw, 100px); }
.section--cream { background: var(--cream); color: var(--ink); }
.section--deep { background: var(--deep); color: var(--cream); }
.section--teal { background: var(--teal); color: var(--cream); }
.section--mist { background: var(--mist); color: var(--ink); }

.section__head {
  display: grid;
  gap: 14px;
  max-width: 66ch;
  margin-block-end: clamp(26px, 4vw, 48px);
}

.section__index {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.26em;
  color: var(--gold);
}
.section__index::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--coral);
}
.section--cream .section__index,
.section--mist .section__index { color: var(--amber); }

.section__title {
  font-size: clamp(27px, 3.6vw, 44px);
  font-weight: 900;
}

.section__lead {
  max-width: 46ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: inherit;
  opacity: 0.86;
}

/* ---------- 正文排版 ---------- */
.prose { max-width: 42em; }
.prose > * + * { margin-block-start: 1.1em; }
.prose h2 {
  margin-block-start: 1.9em;
  font-size: clamp(22px, 2.4vw, 30px);
  padding-block-end: 0.4em;
  border-block-end: 3px solid var(--gold);
}
.prose h3 {
  margin-block-start: 1.6em;
  font-size: clamp(18px, 1.8vw, 22px);
}
.prose ul,
.prose ol {
  padding-inline-start: 1.2em;
  display: grid;
  gap: 0.5em;
}
.prose li { list-style: disc; }
.prose ol li { list-style: decimal; }
.prose a {
  color: var(--amber);
  font-weight: 700;
  text-decoration: none;
  border-block-end: 2px solid var(--gold);
}
.prose a:hover { color: var(--coral); border-block-end-color: var(--coral); }
.prose strong { font-weight: 900; }
.prose code {
  font-family: var(--font-mono);
  font-size: 0.92em;
  padding: 0.12em 0.4em;
  background: var(--mist);
  border: 1px solid rgba(16, 24, 32, 0.18);
}
.section--deep .prose a,
.section--teal .prose a { color: var(--gold); }
.section--deep .prose code,
.section--teal .prose code {
  background: rgba(220, 232, 240, 0.14);
  border-color: rgba(220, 232, 240, 0.3);
}

/* ---------- 网格 ---------- */
.grid { display: grid; gap: clamp(18px, 2.6vw, 30px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--asym { grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr); align-items: start; }

/* ---------- 卡片 ---------- */
.card {
  position: relative;
  display: grid;
  gap: 12px;
  align-content: start;
  padding: clamp(20px, 2.6vw, 30px);
  background: var(--cream);
  color: var(--ink);
  border: 3px solid var(--ink);
  box-shadow: var(--shadow-hard);
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.card:hover {
  transform: translate(-3px, -3px);
  box-shadow: 11px 11px 0 var(--gold);
}

.card__index {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.22em;
  color: var(--amber);
}

.card__title {
  font-size: clamp(19px, 2vw, 25px);
  font-weight: 900;
  line-height: 1.3;
}

.card__text {
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(16, 24, 32, 0.82);
}

.card__meta {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: rgba(16, 24, 32, 0.55);
}

/* ---------- 标签与状态 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
  line-height: 1.6;
  border: 2px solid currentColor;
  background: transparent;
}
.tag--gold { color: var(--amber); background: rgba(217, 164, 65, 0.2); }
.tag--coral { color: var(--coral); background: rgba(242, 107, 78, 0.14); }
.tag--green { color: var(--green); background: rgba(47, 125, 92, 0.14); }
.tag--amber { color: var(--amber); background: rgba(138, 90, 43, 0.12); }
.tag--sage { color: var(--teal); background: rgba(168, 183, 166, 0.28); }

.status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 3px 10px;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.1em;
  border: 1px solid currentColor;
  border-radius: 999px;
  white-space: nowrap;
}
.status::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
  flex: 0 0 auto;
}
.status--ok { color: var(--green); }
.status--warn { color: var(--amber); }
.status--bad { color: var(--red); }

/* ---------- 提示框 ---------- */
.notice {
  padding: 16px 20px;
  background: var(--mist);
  border: 2px solid var(--ink);
  border-inline-start: 8px solid var(--gold);
  box-shadow: var(--shadow-soft);
  font-size: 15px;
  line-height: 1.8;
}
.notice--info { border-inline-start-color: var(--teal); }
.notice--warn {
  background: #FCEDE8;
  border-inline-start-color: var(--coral);
  border-color: var(--red);
}

.notice__title {
  margin-block-end: 6px;
  font-size: 14.5px;
  font-weight: 900;
  letter-spacing: 0.08em;
}

/* ---------- 步骤 ---------- */
.steps { display: grid; gap: 18px; }

.step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  align-items: start;
}

.step__num {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 800;
  color: var(--gold);
  background: var(--deep);
  border: 2px solid var(--gold);
}

.step__body {
  display: grid;
  gap: 6px;
  padding-block-end: 16px;
  border-block-end: 1px dashed rgba(16, 24, 32, 0.24);
}
.section--deep .step__body,
.section--teal .step__body { border-block-end-color: rgba(220, 232, 240, 0.28); }

/* ---------- 表格 ---------- */
.table-wrap {
  overflow-x: auto;
  background: var(--cream);
  border: 3px solid var(--ink);
  box-shadow: var(--shadow-soft);
}

.data-table {
  width: 100%;
  min-width: 540px;
  border-collapse: collapse;
  font-size: 15px;
  color: var(--ink);
}

.data-table th,
.data-table td {
  padding: 14px 16px;
  text-align: start;
  border-block-end: 1px solid rgba(16, 24, 32, 0.16);
}

.data-table thead th {
  background: var(--deep);
  color: var(--cream);
  font-size: 11.5px;
  font-weight: 800;
  letter-spacing: 0.18em;
  border-block-end: 0;
  white-space: nowrap;
}

.data-table tbody tr:nth-child(even) { background: var(--mist); }
.data-table tbody tr:last-child td { border-block-end: 0; }

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: rgba(16, 24, 32, 0.62);
}
.section--deep .breadcrumb,
.section--teal .breadcrumb { color: rgba(220, 232, 240, 0.7); }

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  font-family: var(--font-mono);
  color: var(--gold);
}

.breadcrumb__link {
  color: inherit;
  text-decoration: none;
  border-block-end: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.breadcrumb__link:hover,
.breadcrumb__link:focus-visible {
  color: var(--coral);
  border-block-end-color: var(--coral);
}

/* ---------- 浮动索引 ---------- */
.toc {
  display: grid;
  gap: 10px;
  align-content: start;
  position: sticky;
  inset-block-start: calc(var(--header-h) + 24px);
}

.toc__title {
  font-size: 11.5px;
  font-weight: 800;
  letter-spacing: 0.24em;
  color: var(--amber);
}

.toc__list { display: grid; gap: 2px; }

.toc__link {
  display: block;
  padding: 9px 12px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--ink);
  text-decoration: none;
  border-inline-start: 3px solid transparent;
  transition: background-color 0.18s var(--ease), border-color 0.18s var(--ease),
    color 0.18s var(--ease);
}
.toc__link:hover { background: rgba(217, 164, 65, 0.16); }
.toc__link[aria-current="true"] {
  border-inline-start-color: var(--coral);
  background: rgba(217, 164, 65, 0.24);
  font-weight: 800;
}

/* ---------- 图片容器 ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  width: 100%;
  aspect-ratio: 16 / 10;
  background-color: var(--teal);
  background-image:
    repeating-linear-gradient(
      115deg,
      rgba(217, 164, 65, 0.18) 0 2px,
      rgba(217, 164, 65, 0) 2px 24px
    ),
    radial-gradient(120% 120% at 78% 18%, rgba(242, 107, 78, 0.34), rgba(11, 34, 57, 0) 60%),
    linear-gradient(160deg, var(--teal) 0%, var(--deep) 100%);
  border: 3px solid var(--ink);
  box-shadow: var(--shadow-soft);
}

.media img,
.media svg,
.media picture,
.media video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media--wide { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 3 / 4; }

.media__caption {
  margin-block-start: 10px;
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: rgba(16, 24, 32, 0.6);
}

/* ---------- 移动抽屉 ---------- */
@media (max-width: 960px) {
  :root { --header-h: 72px; }

  .nav-toggle { display: inline-flex; }

  .primary-nav {
    position: fixed;
    inset-block-start: var(--header-h);
    inset-inline: 0;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    padding: 14px var(--gutter) 28px;
    background: var(--deep);
    background-image: repeating-linear-gradient(
      115deg,
      rgba(217, 164, 65, 0.1) 0 2px,
      rgba(217, 164, 65, 0) 2px 26px
    );
    border-block-start: 1px solid rgba(217, 164, 65, 0.45);
    box-shadow: 0 24px 44px rgba(4, 14, 24, 0.55);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-14px);
    transition: opacity 0.22s var(--ease), transform 0.22s var(--ease),
      visibility 0.22s var(--ease);
  }

  .site-header[data-open] .primary-nav {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav-link {
    display: block;
    padding: 16px 4px;
    font-size: 17px;
    border-block-end: 1px solid rgba(220, 232, 240, 0.16);
  }
  .nav-link::after { display: none; }
  .nav-link[aria-current="page"] {
    color: var(--coral);
    padding-inline-start: 12px;
  }

  body.is-nav-open { overflow: hidden; }

  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--asym { grid-template-columns: minmax(0, 1fr); }

  .toc {
    position: static;
    inset-block-start: auto;
  }

  .footer__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .footer__brand { grid-column: 1 / -1; }
}

@media (max-width: 680px) {
  :root { --header-h: 64px; }

  .header__cta { display: none; }
  .brand__mark { width: 38px; height: 38px; font-size: 12.5px; }
  .brand__name { font-size: 16px; }
  .brand__tag { font-size: 9.5px; letter-spacing: 0.2em; }

  .grid--2,
  .grid--3 { grid-template-columns: minmax(0, 1fr); }

  .footer__grid { grid-template-columns: minmax(0, 1fr); }
  .footer__legal { flex-direction: column; align-items: flex-start; gap: 6px; }

  .backtop {
    inset-block-end: 16px;
    inset-inline-end: 16px;
    width: 46px;
    height: 46px;
  }

  .step { grid-template-columns: auto minmax(0, 1fr); gap: 12px; }
  .step__num { width: 38px; height: 38px; font-size: 13.5px; }
}

@media (min-width: 961px) {
  .primary-nav { display: block; }
  body.is-nav-open { overflow: auto; }
}

/* ---------- 减少动态 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .card:hover,
  .btn:hover,
  .brand:hover .brand__mark { transform: none; }
}