/* ============================================================
   澳门沙金服务 · /assets/site.css
   共享外壳：蓝图网格底、侧边轨道导航、页脚、通用组件
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body,
h1, h2, h3, h4, h5, h6,
p, figure, blockquote, dl, dd, ol, ul {
  margin: 0;
}

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

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

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

a { color: inherit; }

main { display: block; }

/* ---------- 2. 变量 ---------- */
:root {
  --shajin: #D4A017;
  --shajin-deep: #A97C10;
  --copper: #C67C3E;
  --ink: #1F3B2D;
  --ink-deep: #13251C;
  --mist: #E8E5DF;
  --warm: #F7F4EE;
  --graphite: #2A2A26;
  --teal: #2F8B7A;
  --metal: #C9C6BD;

  --rail-w: 236px;
  --page-max: 1320px;
  --gutter: clamp(1.15rem, 4vw, 3rem);
  --blu: 8px;

  --font-display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "Noto Sans Mono", "JetBrains Mono", ui-monospace, "SFMono-Regular", Consolas, monospace;

  --line: rgba(31, 59, 45, 0.14);
  --line-strong: rgba(31, 59, 45, 0.3);
  --line-light: rgba(201, 198, 189, 0.22);
  --ease: cubic-bezier(0.22, 0.68, 0.24, 1);
  --radius: 2px;

  --shadow-card: 0 14px 34px rgba(19, 37, 28, 0.08);
  --shadow-rail: -18px 0 48px rgba(19, 37, 28, 0.34);
}

/* ---------- 3. 基准排版 ---------- */
body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--graphite);
  background-color: var(--mist);
  background-image:
    linear-gradient(to right, rgba(31, 59, 45, 0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(31, 59, 45, 0.05) 1px, transparent 1px);
  background-size: 72px 72px;
  background-position: -1px -1px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--ink);
  line-height: 1.18;
  font-weight: 700;
  letter-spacing: 0.01em;
}

h1 { font-size: clamp(2.6rem, 6vw, 5.6rem); line-height: 1.05; }
h2 { font-size: clamp(1.8rem, 3.2vw, 3rem); }
h3 {
  font-family: var(--font-body);
  font-size: clamp(1.15rem, 1.6vw, 1.5rem);
  font-weight: 600;
  line-height: 1.35;
}

p { text-wrap: pretty; }

strong { font-weight: 700; color: var(--ink); }

.mono {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
}

/* ---------- 4. 焦点与可访问性 ---------- */
a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--shajin);
  outline-offset: 3px;
  border-radius: var(--radius);
}

.skip-link {
  position: absolute;
  top: 0;
  left: -9999px;
  z-index: 200;
  display: inline-block;
  padding: 0.7rem 1.15rem;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--ink-deep);
  background: var(--shajin);
  border-radius: 0 0 var(--radius) 0;
  text-decoration: none;
}

.skip-link:focus {
  left: 0;
  top: 0;
}

/* ---------- 5. 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.72rem 1.3rem;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  line-height: 1.2;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition:
    background-color 0.2s var(--ease),
    color 0.2s var(--ease),
    border-color 0.2s var(--ease),
    transform 0.2s var(--ease);
}

.btn--primary {
  color: var(--ink-deep);
  background: var(--shajin);
  border-color: var(--shajin);
}

.btn--primary:hover {
  background: var(--copper);
  border-color: var(--copper);
  transform: translateY(-2px);
}

.btn--ghost {
  color: var(--ink);
  background: transparent;
  border-color: var(--line-strong);
}

.btn--ghost:hover {
  color: var(--shajin-deep);
  background: rgba(212, 160, 23, 0.08);
  border-color: rgba(212, 160, 23, 0.6);
}

.btn--rail {
  margin-top: 0.6rem;
  padding: 0.52rem 0.8rem;
  font-size: 0.78rem;
  color: var(--shajin);
  background: rgba(212, 160, 23, 0.14);
  border-color: rgba(212, 160, 23, 0.5);
}

.btn--rail:hover {
  color: var(--ink-deep);
  background: var(--shajin);
  border-color: var(--shajin);
}

/* ---------- 6. 头部：移动端顶栏 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.7rem var(--gutter);
  color: var(--warm);
  background: linear-gradient(180deg, #1F3B2D 0%, #162B21 100%);
  border-bottom: 1px solid rgba(212, 160, 23, 0.32);
}

.rail-brand {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: 100%;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
  color: inherit;
}

.brand-mark {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 2.2rem;
  height: 2.2rem;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--ink-deep);
  background: var(--shajin);
  border-radius: var(--radius);
  box-shadow: inset 0 -2px 0 rgba(19, 37, 28, 0.26);
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  line-height: 1.2;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--warm);
}

.brand-line {
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  color: rgba(212, 160, 23, 0.92);
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.5rem 0.8rem;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--warm);
  background: rgba(247, 244, 238, 0.06);
  border: 1px solid rgba(212, 160, 23, 0.5);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.nav-toggle:hover {
  background: rgba(212, 160, 23, 0.16);
  border-color: var(--shajin);
}

.nav-toggle-bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: background-color 0.2s var(--ease);
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: transform 0.24s var(--ease);
}

.nav-toggle-bars::before { top: -6px; }
.nav-toggle-bars::after { top: 6px; }

.nav-toggle[aria-expanded="true"] .nav-toggle-bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { transform: translateY(-6px) rotate(-45deg); }

/* ---------- 7. 导航：移动端抽屉 ---------- */
.site-nav {
  position: fixed;
  inset-block: 0;
  inset-inline-end: 0;
  z-index: 90;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  width: min(88vw, 340px);
  padding: 5.4rem 1.15rem 1.75rem;
  background: linear-gradient(170deg, #1F3B2D 0%, #13251C 100%);
  border-inline-start: 1px solid rgba(212, 160, 23, 0.32);
  box-shadow: var(--shadow-rail);
  transform: translateX(102%);
  visibility: hidden;
  overflow-y: auto;
  overscroll-behavior: contain;
  transition: transform 0.34s var(--ease), visibility 0.34s var(--ease);
}

.site-nav[data-open] {
  transform: none;
  visibility: visible;
}

.nav-caption {
  padding-inline-start: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  color: rgba(201, 198, 189, 0.6);
}

.nav-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.nav-list a {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  padding: 0.62rem 0.75rem;
  font-size: 0.95rem;
  color: rgba(247, 244, 238, 0.78);
  text-decoration: none;
  border-inline-start: 2px solid transparent;
  border-radius: var(--radius);
  transition:
    color 0.18s var(--ease),
    background-color 0.18s var(--ease),
    border-color 0.18s var(--ease),
    transform 0.18s var(--ease);
}

.nav-list a:hover {
  color: var(--warm);
  background: rgba(212, 160, 23, 0.12);
  border-inline-start-color: var(--copper);
  transform: translateX(2px);
}

.nav-list a[aria-current="page"] {
  color: var(--shajin);
  font-weight: 600;
  background: rgba(212, 160, 23, 0.15);
  border-inline-start-color: var(--shajin);
}

.nav-idx {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.08em;
  color: rgba(201, 198, 189, 0.55);
}

.nav-list a[aria-current="page"] .nav-idx { color: var(--shajin); }

.nav-label { flex: 1 1 auto; }

.rail-meta {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1rem 0.75rem 0;
  border-top: 1px solid rgba(212, 160, 23, 0.24);
}

.rail-badge {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  letter-spacing: 0.05em;
  color: var(--shajin);
}

.rail-note {
  font-size: 0.72rem;
  line-height: 1.55;
  letter-spacing: 0.05em;
  color: rgba(201, 198, 189, 0.72);
}

/* ---------- 8. 头部：桌面端侧边轨道 ---------- */
@media (min-width: 1024px) {
  body {
    padding-inline-start: var(--rail-w);
    background-attachment: fixed;
  }

  .site-header {
    position: fixed;
    inset-block: 0;
    inset-inline-start: 0;
    z-index: 80;
    width: var(--rail-w);
    flex-direction: column;
    align-items: stretch;
    gap: 1.5rem;
    padding: 1.6rem 1.05rem 1.2rem;
    border-bottom: 0;
    border-inline-end: 1px solid rgba(212, 160, 23, 0.26);
    background: linear-gradient(180deg, #1F3B2D 0%, #13251C 100%);
    overflow-y: auto;
    overscroll-behavior: contain;
    scrollbar-width: thin;
  }

  .rail-brand {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.85rem;
    width: auto;
  }

  .nav-toggle { display: none; }

  .site-nav {
    position: static;
    inset: auto;
    z-index: auto;
    flex: 1 1 auto;
    width: auto;
    padding: 1.1rem 0 0;
    background: transparent;
    border-inline-start: 0;
    border-top: 1px solid rgba(212, 160, 23, 0.22);
    box-shadow: none;
    transform: none;
    visibility: visible;
    overflow: visible;
    transition: none;
  }

  .nav-caption { padding-inline-start: 0.7rem; }

  .rail-meta { padding-inline: 0.7rem; }
}

@media (max-width: 1023px) {
  body.nav-open { overflow: hidden; }
}

/* ---------- 9. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(3.5rem, 8vw, 7rem);
  color: rgba(247, 244, 238, 0.78);
  background: radial-gradient(140% 120% at 8% 0%, #1F3B2D 0%, #13251C 58%, #0E1C15 100%);
  border-top: 2px solid var(--shajin);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(212, 160, 23, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(212, 160, 23, 0.07) 1px, transparent 1px);
  background-size: 72px 72px;
  pointer-events: none;
}

.site-footer > * { position: relative; }

.footer-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(2rem, 4vw, 3rem);
  width: 100%;
  max-width: var(--page-max);
  margin-inline: auto;
  padding: clamp(2.5rem, 5vw, 4.25rem) var(--gutter) clamp(2rem, 4vw, 3rem);
}

.footer-name {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 2.4vw, 1.9rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--warm);
}

.footer-line {
  margin-top: 0.35rem;
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  color: var(--shajin);
}

.footer-desc {
  max-width: 34ch;
  margin-top: 1rem;
  font-size: 0.9rem;
  line-height: 1.72;
  color: rgba(247, 244, 238, 0.66);
}

.footer-stamp {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin-top: 1.25rem;
  padding: 0.4rem 0.7rem;
  background: rgba(212, 160, 23, 0.08);
  border: 1px solid rgba(212, 160, 23, 0.4);
  border-radius: var(--radius);
}

.footer-stamp .mono {
  font-size: 0.82rem;
  letter-spacing: 0.05em;
  color: var(--shajin);
}

.footer-stamp-note {
  font-size: 0.7rem;
  color: rgba(247, 244, 238, 0.6);
}

.footer-groups {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 1.75rem 1.25rem;
  align-content: start;
}

.footer-group { min-width: 0; }

.footer-title {
  margin-bottom: 0.85rem;
  padding-bottom: 0.55rem;
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--shajin);
  border-bottom: 1px solid rgba(212, 160, 23, 0.24);
}

.footer-list li + li { margin-top: 0.5rem; }

.footer-list a {
  display: inline-block;
  font-size: 0.875rem;
  color: rgba(247, 244, 238, 0.72);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.footer-list a:hover {
  color: var(--warm);
  border-bottom-color: var(--copper);
}

.footer-list--contact {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.footer-list--contact li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.3rem 0.55rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px dashed rgba(201, 198, 189, 0.18);
}

.footer-list--contact li + li { margin-top: 0; }

.contact-key {
  flex: 0 0 auto;
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: rgba(212, 160, 23, 0.85);
}

.contact-val {
  flex: 1 1 12rem;
  min-width: 0;
  font-size: 0.85rem;
  line-height: 1.6;
  color: rgba(247, 244, 238, 0.82);
  word-break: break-word;
}

.copy-btn {
  margin-inline-start: auto;
  padding: 0.18rem 0.5rem;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: rgba(247, 244, 238, 0.62);
  background: transparent;
  border: 1px solid rgba(201, 198, 189, 0.3);
  border-radius: var(--radius);
  cursor: pointer;
  transition:
    color 0.18s var(--ease),
    background-color 0.18s var(--ease),
    border-color 0.18s var(--ease);
}

.copy-btn:hover {
  color: var(--ink-deep);
  background: var(--shajin);
  border-color: var(--shajin);
}

.copy-btn[data-copied] {
  color: var(--warm);
  background: var(--teal);
  border-color: var(--teal);
}

.footer-note {
  margin-top: 0.9rem;
  font-size: 0.78rem;
  line-height: 1.65;
  color: rgba(201, 198, 189, 0.6);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1.5rem;
  width: 100%;
  max-width: var(--page-max);
  margin-inline: auto;
  padding: 1.15rem var(--gutter) 1.6rem;
  font-size: 0.76rem;
  color: rgba(201, 198, 189, 0.62);
  border-top: 1px solid rgba(201, 198, 189, 0.16);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
}

.footer-legal a {
  color: rgba(247, 244, 238, 0.72);
  text-decoration: none;
  border-bottom: 1px solid rgba(212, 160, 23, 0.3);
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.footer-legal a:hover {
  color: var(--shajin);
  border-bottom-color: var(--shajin);
}

.footer-icp {
  margin-inline-start: auto;
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: rgba(201, 198, 189, 0.55);
}

@media (min-width: 720px) {
  .footer-inner { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-brand { grid-column: 1 / -1; }
}

@media (min-width: 1100px) {
  .footer-inner { grid-template-columns: 1.15fr 1.35fr 1.1fr; }
  .footer-brand { grid-column: auto; }
}

/* ---------- 10. 容器与网格 ---------- */
.container {
  width: 100%;
  max-width: var(--page-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--narrow { max-width: 880px; }
.container--wide { max-width: 1560px; }

.grid {
  display: grid;
  gap: clamp(1.25rem, 2.4vw, 2rem);
}

.grid--2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr)); }
.grid--asym { grid-template-columns: 1fr; }

@media (min-width: 900px) {
  .grid--asym { grid-template-columns: 5fr 11fr; }
}

/* ---------- 11. 章节头与展签 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--shajin-deep);
}

.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--copper);
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem 2rem;
  padding-bottom: 1rem;
  margin-bottom: clamp(1.4rem, 3vw, 2.25rem);
  border-bottom: 1px solid var(--line);
}

.section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 2.8vw, 2.4rem);
  line-height: 1.2;
}

/* ---------- 12. 卡片与标签 ---------- */
.card {
  position: relative;
  padding: clamp(1.15rem, 2.2vw, 1.75rem);
  background: var(--warm);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition:
    border-color 0.2s var(--ease),
    box-shadow 0.2s var(--ease),
    transform 0.2s var(--ease);
}

.card:hover {
  border-color: rgba(212, 160, 23, 0.6);
  box-shadow: var(--shadow-card);
  transform: translateY(-3px);
}

.card--glass {
  background: rgba(247, 244, 238, 0.62);
  border-color: rgba(255, 255, 255, 0.5);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.24rem 0.55rem;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--ink);
  background: var(--warm);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
}

.tag--gold {
  color: var(--shajin-deep);
  background: rgba(212, 160, 23, 0.12);
  border-color: rgba(212, 160, 23, 0.55);
}

/* ---------- 13. 面包屑 ---------- */
.breadcrumb {
  font-size: 0.78rem;
  color: var(--graphite);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.breadcrumb li + li::before {
  content: "/";
  font-family: var(--font-mono);
  color: var(--metal);
}

.breadcrumb a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.18s var(--ease);
}

.breadcrumb a:hover { border-bottom-color: var(--copper); }
.breadcrumb [aria-current="page"] { color: var(--graphite); }

/* ---------- 14. 长文 ---------- */
.prose { max-width: 68ch; }

.prose > * + * { margin-top: 1.05em; }

.prose h2 {
  margin-top: 2.25em;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.4vw, 2rem);
  line-height: 1.26;
}

.prose h3 {
  margin-top: 1.9em;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--ink);
}

.prose ul,
.prose ol {
  padding-inline-start: 1.25rem;
  list-style: disc;
}

.prose ol { list-style: decimal; }
.prose li + li { margin-top: 0.35em; }

.prose a {
  color: var(--shajin-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(212, 160, 23, 0.5);
}

.prose a:hover { color: var(--copper); }

.prose blockquote {
  margin-top: 1.5em;
  padding: 0.9rem 1.2rem;
  color: var(--ink);
  background: var(--warm);
  border-inline-start: 3px solid var(--shajin);
}

/* ---------- 15. 图片容器基础 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background: linear-gradient(140deg, #1F3B2D 0%, #13251C 60%, #0E1C15 100%);
  border: 1px solid var(--metal);
  border-radius: var(--radius);
}

.media-frame > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame::before {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid rgba(212, 160, 23, 0.22);
  pointer-events: none;
}

.media-frame::after {
  content: "";
  position: absolute;
  left: 8px;
  bottom: 8px;
  width: 44px;
  height: 2px;
  background: linear-gradient(90deg, var(--shajin), transparent);
  pointer-events: none;
}

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }

/* ---------- 16. 滚动显现 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity 0.48s var(--ease),
    transform 0.48s var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
  will-change: opacity, transform;
}

[data-reveal].is-revealed {
  opacity: 1;
  transform: none;
  will-change: auto;
}

/* ---------- 17. 减弱动效 ---------- */
@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;
    transition-delay: 0ms !important;
    scroll-behavior: auto !important;
  }

  [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }

  .card:hover,
  .btn--primary:hover,
  .nav-list a:hover {
    transform: none;
  }
}