/* =========================================================
   辉煌CN · 共享样式表 /assets/site.css
   结构：1 变量与重置 · 2 排版 · 3 基础件 · 4 页头 · 5 页脚
        6 响应式 · 7 焦点与动效降级
   ========================================================= */

/* ---------- 1. 变量与重置 ---------- */
:root {
  /* 色彩 */
  --ink: #0E1B2C;
  --ink-deep: #07111F;
  --paper: #F7F1E6;
  --paper-white: #FFFDF8;
  --gold: #D96A12;
  --gold-deep: #A84A08;
  --gold-light: #F2A65A;
  --teal: #00B8A9;
  --teal-deep: #007A70;
  --violet: #6C4DFF;
  --slate: #5B6775;
  --line: #D9CFC0;

  --text: var(--ink);
  --text-muted: var(--slate);

  /* 字体 */
  --font-display: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "HarmonyOS Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", Consolas, "Liberation Mono", monospace;

  /* 尺度 */
  --edge: clamp(20px, 6vw, 88px);
  --max: 1280px;
  --gap: clamp(16px, 2.4vw, 28px);
  --radius: 2px;

  /* 材质 */
  --shadow-soft: 0 1px 0 rgba(14, 27, 44, .04), 0 22px 44px -34px rgba(14, 27, 44, .45);
  --ease: cubic-bezier(.22, .8, .3, 1);
  --dur: 160ms;
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  margin: 0;
  min-height: 100%;
  background-color: var(--paper);
  background-image:
    radial-gradient(circle at 14% 0%, rgba(217, 106, 18, .07), transparent 46%),
    radial-gradient(circle at 88% 8%, rgba(0, 184, 169, .05), transparent 42%);
  background-repeat: no-repeat;
  background-attachment: fixed;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  font-weight: 400;
  letter-spacing: .012em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd { margin: 0; }
ul, ol { margin: 0; padding: 0; }
ul[class], ol[class] { list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; }
a { color: inherit; }

::selection { background: var(--gold); color: var(--ink-deep); }

/* ---------- 2. 排版 ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: .06em;
  color: var(--ink);
}

h1 { font-size: clamp(34px, 5.4vw, 64px); font-weight: 900; letter-spacing: .08em; }
h2 { font-size: clamp(24px, 3.2vw, 40px); font-weight: 700; }
h3 { font-size: clamp(19px, 2.2vw, 24px); font-weight: 600; letter-spacing: .05em; }

p { max-width: 72ch; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--gold-deep);
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 2px;
  background: var(--gold);
}

.lede {
  max-width: 60ch;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.9;
  color: var(--slate);
}

.meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--slate);
}

.rule {
  height: 1px;
  border: 0;
  margin: 0;
  background: var(--line);
}

.stack > * + * { margin-top: var(--gap); }

/* ---------- 3. 基础件 ---------- */
.container {
  width: min(100% - 2 * var(--edge), var(--max));
  margin-inline: auto;
}

.section { padding-block: clamp(40px, 6vw, 88px); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 14px 32px;
  padding-bottom: 14px;
  margin-bottom: clamp(20px, 3vw, 36px);
  border-bottom: 1px solid var(--line);
}

.section-index {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .26em;
  color: var(--gold-deep);
}

.section-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 2.8vw, 34px);
  letter-spacing: .06em;
  line-height: 1.3;
}

.section-note {
  max-width: 38ch;
  font-size: 13px;
  line-height: 1.8;
  letter-spacing: .06em;
  color: var(--slate);
}

/* 网格 */
.grid { display: grid; gap: var(--gap); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-7-5 { grid-template-columns: 7fr 5fr; }
.grid-5-7 { grid-template-columns: 5fr 7fr; }
.grid-8-4 { grid-template-columns: 8fr 4fr; }
.grid-4-8 { grid-template-columns: 4fr 8fr; }

/* 色带 */
.band {
  padding-block: clamp(24px, 4vw, 44px);
  background: var(--ink);
  color: var(--paper-white);
}

.band--gold { background: var(--gold); color: var(--ink-deep); }
.band--teal { background: var(--teal-deep); color: var(--paper-white); }

.band-inner {
  width: min(100% - 2 * var(--edge), var(--max));
  margin-inline: auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px 44px;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 26px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .1em;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  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(--gold);
  border-color: var(--gold);
  color: var(--ink-deep);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--gold-light);
  border-color: var(--gold-light);
}

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

.btn-ghost:hover,
.btn-ghost:focus-visible {
  border-color: var(--gold);
  color: var(--gold-deep);
}

.btn-night {
  background: transparent;
  border-color: rgba(217, 207, 192, .42);
  color: var(--paper-white);
}

.btn-night:hover,
.btn-night:focus-visible {
  border-color: var(--teal);
  color: var(--teal);
}

/* 链接 */
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding-bottom: 2px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--gold-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.link-arrow:hover,
.link-arrow:focus-visible {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

/* 面包屑 */
.breadcrumb {
  padding-block: 18px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--slate);
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.breadcrumb-item { display: inline-flex; align-items: center; }

.breadcrumb-item a {
  color: var(--slate);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.breadcrumb-item a:hover,
.breadcrumb-item a:focus-visible {
  color: var(--gold-deep);
  border-bottom-color: var(--gold);
}

.breadcrumb-item [aria-current="page"] {
  color: var(--ink);
  font-weight: 600;
}

.breadcrumb-sep { color: var(--line); }

/* 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 4px 11px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--teal-deep);
  background: rgba(0, 184, 169, .1);
  border: 1px solid rgba(0, 184, 169, .32);
  border-radius: 999px;
}

.tag::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

.tag--gold {
  color: var(--gold-deep);
  background: rgba(217, 106, 18, .1);
  border-color: rgba(217, 106, 18, .34);
}

/* 卡片面 */
.surface {
  padding: clamp(20px, 2.6vw, 32px);
  background: var(--paper-white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.surface:hover {
  border-color: var(--gold-light);
  box-shadow: 0 1px 0 rgba(14, 27, 44, .05), 0 26px 48px -32px rgba(14, 27, 44, .5);
}

/* 图片容器 */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  margin: 0;
  background: var(--paper-white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
}

.media > img,
.media > picture,
.media > svg,
.media > .media-placeholder {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame { aspect-ratio: 16 / 10; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--banner { aspect-ratio: 21 / 9; }

.media-placeholder {
  display: grid;
  place-items: center;
  padding: 20px;
  background:
    linear-gradient(135deg, rgba(217, 106, 18, .16), rgba(0, 184, 169, .13)),
    var(--paper);
  color: var(--slate);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  text-align: center;
}

.media-caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: .06em;
  color: var(--slate);
}

/* ---------- 4. 页头 ---------- */
.skip-link {
  position: fixed;
  top: 12px;
  left: 50%;
  z-index: 200;
  padding: 10px 22px;
  background: var(--gold);
  color: var(--ink-deep);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .1em;
  text-decoration: none;
  border-radius: 999px;
  transform: translate(-50%, -200%);
  transition: transform var(--dur) var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translate(-50%, 0);
  outline: 3px solid var(--paper-white);
  outline-offset: 2px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: var(--ink);
  color: var(--paper-white);
  border-bottom: 1px solid rgba(217, 207, 192, .16);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.site-header[data-scrolled] {
  background: rgba(7, 17, 31, .97);
  box-shadow: 0 16px 44px -32px rgba(7, 17, 31, .95);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--gap);
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding: 15px var(--edge);
}

/* 品牌锁 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  color: inherit;
  text-decoration: none;
  transition: opacity var(--dur) var(--ease);
}

.brand:hover { opacity: .82; }

.brand-mark {
  width: 26px;
  height: 26px;
  flex: 0 0 auto;
  border-radius: 1px;
  background-color: var(--gold);
  background-image: repeating-linear-gradient(
    180deg,
    transparent 0 4px,
    rgba(7, 17, 31, .92) 4px 7px
  );
  box-shadow: 0 0 0 1px rgba(242, 166, 90, .5);
  transition: transform var(--dur) var(--ease);
}

.brand:hover .brand-mark { transform: translateY(-1px); }

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 900;
  letter-spacing: .16em;
  color: var(--paper-white);
}

.brand-note {
  margin-top: 3px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .3em;
  color: rgba(255, 253, 248, .48);
}

/* 右区 */
.header-right {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 18px;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-item { display: flex; }

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 10px 13px;
  font-family: var(--font-body);
  font-size: 14.5px;
  font-weight: 500;
  letter-spacing: .06em;
  color: rgba(255, 253, 248, .7);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.nav-index {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .1em;
  color: var(--gold-light);
  opacity: 0;
  transform: translateY(3px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.nav-label { display: inline-block; }

.nav-link::after {
  content: "";
  position: absolute;
  left: 13px;
  right: 13px;
  bottom: 3px;
  height: 1px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease);
}

.nav-link:hover,
.nav-link:focus-visible { color: var(--paper-white); }

.nav-link:hover .nav-index,
.nav-link:focus-visible .nav-index {
  opacity: .92;
  transform: none;
}

.nav-link:hover::after,
.nav-link:focus-visible::after { transform: scaleX(1); }

.nav-link[aria-current="page"] { color: var(--paper-white); }

.nav-link[aria-current="page"] .nav-index {
  opacity: 1;
  transform: none;
  color: var(--teal);
}

.nav-link[aria-current="page"]::after {
  height: 2px;
  background: var(--teal);
  transform: scaleX(1);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  background: var(--gold);
  color: var(--ink-deep);
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: .08em;
  text-decoration: none;
  border: 1px solid var(--gold);
  border-radius: var(--radius);
  white-space: nowrap;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.nav-cta:hover,
.nav-cta:focus-visible {
  background: var(--gold-light);
  border-color: var(--gold-light);
  color: var(--ink-deep);
}

/* 移动端开关 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: transparent;
  border: 1px solid rgba(217, 207, 192, .3);
  border-radius: var(--radius);
  color: var(--paper-white);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .2em;
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
  border-color: var(--gold);
  background: rgba(217, 106, 18, .16);
}

.nav-toggle-bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 16px;
  height: 14px;
}

.nav-toggle-bar {
  display: block;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: transform var(--dur) var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) { transform: translateY(3px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) { transform: translateY(-3px) rotate(-45deg); }

/* 进度条与遮罩 */
.header-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--gold) 0%, var(--gold-light) 55%, var(--teal) 100%);
  transform: scaleX(0);
  transform-origin: left center;
  pointer-events: none;
}

.nav-scrim {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 5;
  background: rgba(7, 17, 31, .6);
  border: 0;
  padding: 0;
  cursor: pointer;
}

/* ---------- 5. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(64px, 10vw, 120px);
  background: var(--ink-deep);
  color: rgba(255, 253, 248, .78);
  border-top: 3px solid var(--gold);
}

.footer-inner {
  width: min(100% - 2 * var(--edge), var(--max));
  margin-inline: auto;
  padding-block: clamp(40px, 6vw, 72px) 26px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.7fr 1fr 0.9fr 1.5fr;
  gap: clamp(26px, 4vw, 56px);
  padding-bottom: clamp(28px, 4vw, 44px);
  border-bottom: 1px solid rgba(217, 207, 192, .18);
}

.footer-wordmark {
  max-width: none;
  margin-bottom: 12px;
  font-family: var(--font-display);
  font-size: clamp(28px, 3.4vw, 38px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: .16em;
  color: var(--paper-white);
}

.footer-summary {
  max-width: 34ch;
  margin-bottom: 20px;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(255, 253, 248, .6);
}

.footer-feedback {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--teal);
  text-decoration: none;
  border: 1px solid rgba(0, 184, 169, .45);
  border-radius: var(--radius);
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}

.footer-feedback:hover,
.footer-feedback:focus-visible {
  background: var(--teal);
  border-color: var(--teal);
  color: var(--ink-deep);
}

.footer-feedback-arrow {
  transition: transform var(--dur) var(--ease);
}

.footer-feedback:hover .footer-feedback-arrow,
.footer-feedback:focus-visible .footer-feedback-arrow {
  transform: translateX(4px);
}

.footer-note {
  max-width: 32ch;
  margin-top: 12px;
  font-size: 12px;
  line-height: 1.8;
  color: rgba(255, 253, 248, .42);
}

.footer-heading {
  max-width: none;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .28em;
  color: var(--gold-light);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.footer-links a {
  display: inline-block;
  font-size: 14px;
  color: rgba(255, 253, 248, .74);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--paper-white);
  border-bottom-color: var(--gold);
}

.footer-contact-list {
  display: flex;
  flex-direction: column;
  gap: 11px;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(255, 253, 248, .66);
  overflow-wrap: anywhere;
}

.contact-key {
  display: block;
  margin-bottom: 2px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .24em;
  color: rgba(217, 207, 192, .55);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  padding-top: 22px;
  font-size: 12.5px;
  letter-spacing: .05em;
  color: rgba(255, 253, 248, .45);
}

.footer-copy,
.footer-icp { max-width: none; }

.footer-icp {
  font-family: var(--font-mono);
  letter-spacing: .12em;
}

/* ---------- 6. 响应式 ---------- */
@media (max-width: 1180px) {
  .header-inner { padding-inline: clamp(18px, 4vw, 48px); }
  .site-nav { gap: 10px; }
  .nav-link { padding: 10px 9px; font-size: 13.5px; letter-spacing: .03em; }
  .nav-link::after { left: 9px; right: 9px; }
  .nav-index { display: none; }
  .nav-cta { padding: 9px 14px; font-size: 13px; }
}

@media (max-width: 1023px) {
  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 10;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    max-height: 88vh;
    overflow-y: auto;
    padding: 20px var(--edge) calc(24px + env(safe-area-inset-bottom, 0px));
    background: var(--ink-deep);
    border-top: 1px solid rgba(217, 207, 192, .22);
    border-radius: 18px 18px 0 0;
    box-shadow: 0 -26px 60px -22px rgba(7, 17, 31, .85);
    transform: translateY(105%);
    visibility: hidden;
    transition: transform 280ms var(--ease), visibility 0s linear 280ms;
  }

  .site-nav[data-open] {
    transform: translateY(0);
    visibility: visible;
    transition: transform 280ms var(--ease), visibility 0s linear 0s;
  }

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

  .nav-item {
    display: block;
    border-bottom: 1px solid rgba(217, 207, 192, .14);
  }

  .nav-item:first-child { border-top: 1px solid rgba(217, 207, 192, .14); }

  .nav-link {
    justify-content: space-between;
    width: 100%;
    padding: 15px 0;
    font-size: 17px;
    color: rgba(255, 253, 248, .82);
  }

  .nav-link::after { display: none; }

  .nav-index {
    display: inline-block;
    order: 2;
    opacity: 1;
    transform: none;
    font-size: 11px;
    letter-spacing: .16em;
  }

  .nav-link[aria-current="page"] { color: var(--teal); }
  .nav-link[aria-current="page"] .nav-index { color: var(--teal); }

  .nav-cta {
    width: 100%;
    margin-top: 20px;
    padding: 14px 20px;
    font-size: 14px;
  }

  .nav-scrim {
    display: block;
    opacity: 0;
    visibility: hidden;
    transition: opacity 260ms var(--ease), visibility 0s linear 260ms;
  }

  .nav-scrim[data-open] {
    opacity: 1;
    visibility: visible;
    transition: opacity 260ms var(--ease), visibility 0s linear 0s;
  }

  body.nav-open { overflow: hidden; }

  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 860px) {
  .grid-2,
  .grid-3,
  .grid-7-5,
  .grid-5-7,
  .grid-8-4,
  .grid-4-8 { grid-template-columns: minmax(0, 1fr); }

  html { scroll-padding-top: 84px; }
}

@media (max-width: 640px) {
  body { font-size: 15.5px; }

  .brand-name { font-size: 19px; letter-spacing: .13em; }
  .brand-note { display: none; }

  .header-inner { padding-block: 12px; }

  .section-head { flex-direction: column; align-items: flex-start; }

  .footer-grid { grid-template-columns: minmax(0, 1fr); gap: 30px; }
  .footer-base { flex-direction: column; align-items: flex-start; }
  .footer-feedback { width: 100%; justify-content: space-between; }
}

/* ---------- 7. 焦点与动效降级 ---------- */
:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
  border-radius: 1px;
}

.site-header :focus-visible { outline-color: var(--gold-light); }
.site-footer :focus-visible { outline-color: var(--teal); }

#main-content:focus { outline: none; }
#main-content:focus-visible { outline: 2px solid var(--gold); outline-offset: -4px; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    transition-delay: 0s !important;
  }

  .site-nav,
  .site-nav[data-open],
  .nav-scrim,
  .nav-scrim[data-open] {
    transition: none !important;
  }
}