:root {
  --color-surface: #fcfcfc;
  --color-surface-alt: #f2f2f2;
  --color-surface-deep: #e4e4e5;
  --color-ink: #31353a;
  --color-ink-soft: #5a6068;
  --color-ink-muted: #757c85;
  --color-line: #d7d8d9;
  --color-primary: #0f72eb;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #dbe9fa;
  --color-accent: #318400;
  --color-accent-ink: #ffffff;
  --color-highlight: #d7e6cf;
  --color-focus: #2f8000;
  --color-contrast-surface: #14212f;
  --color-contrast-ink: #e4e5e7;
  --color-contrast-line: #424c57;
  --color-contrast-accent: #5dfe01;
  --overlay-scrim: linear-gradient(180deg, rgba(20, 33, 47, 0.35) 0%, rgba(20, 33, 47, 0.72) 55%, rgba(20, 33, 47, 0.92) 100%);
  --font-heading: "Source Han Sans SC", "Noto Sans SC", SimHei, "Microsoft YaHei", sans-serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, Menlo, Consolas, monospace;
  --text-xs: 11.0px;
  --text-sm: 14.7px;
  --text-base: 17px;
  --text-lg: 22.7px;
  --text-xl: 30.2px;
  --text-2xl: 40.3px;
  --text-3xl: 53.7px;
  --text-4xl: 71.5px;
  --text-display: clamp(38px, 7.7vw, 99px);
  --text-figure: clamp(31px, 5.5vw, 71px);
  --weight-heading: 809;
  --weight-body: 400;
  --leading-body: 1.65;
  --leading-heading: 1.16;
  --tracking-heading: -0.007em;
  --radius-sm: 62px;
  --radius-md: 514px;
  --radius-lg: 966px;
  --radius-pill: 999px;
  --border-thin: 2px;
  --border-thick: 2px;
  --shadow-1: none;
  --shadow-2: none;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1120px;
  --measure: 68ch;
  --gutter: 32px;
  --section-y: 93px;
  --section-y-lg: 130px;
}

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

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

body {
  margin: 0;
  background: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-body);
  line-height: var(--leading-body);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd, ul, ol { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; height: auto; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; }
a { color: inherit; text-decoration: none; }
table { width: 100%; border-collapse: collapse; }
abbr { text-decoration: none; }

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

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

.section-deep :focus-visible,
.site-footer :focus-visible {
  outline-color: var(--color-contrast-accent);
}

/* ---------- 中文排版 ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  text-wrap: balance;
}

h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }

.display {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 1.02;
  letter-spacing: -0.02em;
}

.figure-num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
}

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

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-ink-muted);
}

.lead {
  max-width: var(--measure);
  font-size: var(--text-lg);
  line-height: 1.5;
  color: var(--color-ink-soft);
}

.prose { max-width: var(--measure); }
.prose p + p { margin-top: var(--space-3); }
.prose h2 { margin-top: var(--space-6); margin-bottom: var(--space-3); }
.prose h3 { margin-top: var(--space-4); margin-bottom: var(--space-2); }
.prose ul, .prose ol { margin-block: var(--space-3); padding-left: 1.3em; }
.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }
.prose li + li { margin-top: var(--space-1); }
.prose a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.prose a:hover { color: var(--color-accent); }

/* ---------- 布局 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

.section { padding-block: var(--section-y); }
.section-lg { padding-block: var(--section-y-lg); }
.section-alt { background: var(--color-surface-alt); }
.section-deep {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.section-primary {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}
.section-accent {
  background: var(--color-accent);
  color: var(--color-accent-ink);
}

.section-deep h1, .section-deep h2, .section-deep h3, .section-deep h4,
.section-primary h1, .section-primary h2, .section-primary h3, .section-primary h4,
.section-accent h1, .section-accent h2, .section-accent h3, .section-accent h4 {
  color: inherit;
}
.section-deep .lead,
.section-primary .lead,
.section-accent .lead {
  color: color-mix(in srgb, currentColor 84%, transparent);
}
.section-deep .eyebrow,
.section-primary .eyebrow,
.section-accent .eyebrow {
  color: color-mix(in srgb, currentColor 70%, transparent);
}
.section-deep .figure-num { color: var(--color-contrast-accent); }
.section-primary .figure-num,
.section-accent .figure-num { color: currentColor; }

.block-divider,
.header-band {
  display: flex;
  height: var(--space-1);
}
.block-divider > span,
.header-band > span { display: block; height: 100%; }
.block-divider > span:nth-child(1),
.header-band > span:nth-child(1) { flex: 3 1 0; background: var(--color-primary); }
.block-divider > span:nth-child(2),
.header-band > span:nth-child(2) { flex: 2 1 0; background: var(--color-accent); }
.block-divider > span:nth-child(3),
.header-band > span:nth-child(3) { flex: 1 1 0; background: var(--color-contrast-surface); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: var(--space-3) var(--space-4);
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-3);
  border-bottom: var(--border-thick) solid var(--color-line);
}
.section-deep .section-head { border-bottom-color: var(--color-contrast-line); }
.section-head .section-title {
  margin: 0;
  font-size: var(--text-2xl);
}
.section-head__meta {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}
.section-deep .section-head__meta {
  color: color-mix(in srgb, var(--color-contrast-ink) 66%, transparent);
}

.grid-8 {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: var(--space-4) var(--gutter);
}
.col-1 { grid-column: span 1; }
.col-2 { grid-column: span 2; }
.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: 1 / -1; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: 14px var(--space-4);
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 900;
  line-height: 1;
  letter-spacing: 0.04em;
  text-align: center;
  cursor: pointer;
  transition: background-color 200ms ease, color 200ms ease, border-color 200ms ease;
}
.btn-sm {
  padding: 10px var(--space-3);
  font-size: var(--text-xs);
}
.btn-primary {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}
.btn-primary:hover {
  background: color-mix(in srgb, var(--color-primary) 84%, var(--color-contrast-surface));
}
.btn-accent {
  background: var(--color-accent);
  color: var(--color-accent-ink);
}
.btn-accent:hover {
  background: color-mix(in srgb, var(--color-accent) 84%, var(--color-contrast-surface));
}
.btn-ghost {
  background: transparent;
  color: var(--color-ink);
  border-color: var(--color-ink);
}
.btn-ghost:hover { background: var(--color-surface-deep); }
.btn-invert {
  background: var(--color-contrast-accent);
  color: var(--color-contrast-surface);
  border-color: var(--color-contrast-accent);
}
.btn-invert:hover {
  background: var(--color-contrast-ink);
  border-color: var(--color-contrast-ink);
  color: var(--color-contrast-surface);
}

/* ---------- 标签页 ---------- */
.tab-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin-bottom: var(--space-4);
  border-bottom: var(--border-thin) solid var(--color-line);
}
.tab {
  padding: var(--space-2) var(--space-3);
  border-bottom: 4px solid transparent;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 900;
  letter-spacing: 0.04em;
  color: var(--color-ink-soft);
  cursor: pointer;
  transition: background-color 180ms ease, color 180ms ease, border-color 180ms ease;
}
.tab:hover {
  background: var(--color-surface-alt);
  color: var(--color-ink);
}
.tab[aria-selected="true"] {
  background: var(--color-primary-soft);
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}
.tab-panel { padding-top: var(--space-2); }
.tab-panel[hidden] { display: none; }

/* ---------- 显现 ---------- */
html[data-js="true"] [data-reveal] {
  opacity: 0;
  transform: translate3d(0, 18px, 0);
  transition: opacity 240ms ease-out, transform 240ms ease-out;
}
html[data-js="true"] [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 卡片 / 标签 / 图片 ---------- */
.card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-4);
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: calc(var(--radius-sm) / 4);
  transition: background-color 180ms ease, border-color 180ms ease;
}
.card:hover {
  background: var(--color-surface-alt);
  border-color: var(--color-primary);
}
.card-title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
}
.card-text { color: var(--color-ink-soft); }
.card-meta {
  margin-top: auto;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.06em;
}
.tag-accent {
  background: var(--color-highlight);
  color: var(--color-accent);
}
.tag-dark {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-accent);
}

.image-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-sm);
  background: var(--color-surface-deep);
}
.image-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.image-frame--wide { aspect-ratio: 16 / 9; }
.image-frame--tall { aspect-ratio: 3 / 4; }
.image-frame--square { aspect-ratio: 1 / 1; }
.image-frame[data-overlay]::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
  pointer-events: none;
}
.image-caption {
  position: absolute;
  left: var(--space-3);
  right: var(--space-3);
  bottom: var(--space-3);
  z-index: 1;
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
}
.image-frame[data-overlay] .image-caption { z-index: 2; }

/* ---------- 面包屑 ---------- */
.breadcrumbs {
  padding-block: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}
.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
}
.breadcrumbs li {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}
.breadcrumbs li + li::before {
  content: "／";
  color: var(--color-line);
}
.breadcrumbs a:hover { color: var(--color-primary); }
.breadcrumbs [aria-current="page"] { color: var(--color-ink); }

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: absolute;
  top: -120px;
  left: var(--space-3);
  z-index: 100;
  padding: var(--space-2) var(--space-3);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-accent);
  border-radius: var(--radius-pill);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 900;
  transition: top 160ms ease-out;
}
.skip-link:focus {
  top: var(--space-2);
}

/* ---------- 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--color-surface);
  border-bottom: var(--border-thin) solid var(--color-line);
}
.header-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  align-items: center;
  column-gap: var(--space-4);
  padding-top: var(--space-3);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-width: 0;
}
.brand-mark {
  position: relative;
  flex: none;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-pill);
  background: var(--color-primary);
  overflow: hidden;
}
.brand-mark::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 50%;
  background: var(--color-accent);
}
.brand-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.brand-line {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}
.brand-tagline {
  overflow: hidden;
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
  white-space: nowrap;
  text-overflow: ellipsis;
}

.header-service {
  display: flex;
  align-items: center;
  justify-self: end;
  gap: var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}
.service-dot {
  flex: none;
  width: 10px;
  height: 10px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
}

.header-actions {
  display: flex;
  align-items: center;
  justify-self: end;
  gap: var(--space-2);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: var(--space-1);
  padding: 10px var(--space-2);
  border: var(--border-thin) solid var(--color-ink);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  font-weight: 900;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: background-color 200ms ease, color 200ms ease, border-color 200ms ease;
}
.nav-toggle:hover { background: var(--color-surface-deep); }
.nav-toggle-bars {
  display: flex;
  flex-direction: column;
  gap: 3px;
  width: 16px;
}
.nav-toggle-bars > span {
  display: block;
  height: 2px;
  background: currentColor;
  transition: transform 200ms ease, opacity 200ms ease;
}
.nav-toggle-bars > span:nth-child(2) { width: 70%; }
.site-header[data-open="true"] .nav-toggle {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}
.site-header[data-open="true"] .nav-toggle-bars > span:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}
.site-header[data-open="true"] .nav-toggle-bars > span:nth-child(2) { opacity: 0; }
.site-header[data-open="true"] .nav-toggle-bars > span:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

.site-nav {
  grid-column: 1 / -1;
  margin-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
}
.nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
}
.nav-list > li { display: flex; }
.nav-list a {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  border-bottom: 4px solid transparent;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 900;
  color: var(--color-ink);
  transition: background-color 180ms ease, color 180ms ease, border-color 180ms ease;
}
.nav-list a:hover {
  background: var(--color-surface-alt);
  color: var(--color-primary);
}
.nav-index {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 400;
  color: var(--color-ink-muted);
  font-variant-numeric: tabular-nums;
}
.nav-list a[aria-current="page"] {
  background: var(--color-primary);
  color: var(--color-primary-ink);
  border-bottom-color: var(--color-accent);
}
.nav-list a[aria-current="page"] .nav-index {
  color: color-mix(in srgb, var(--color-primary-ink) 72%, transparent);
}

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: 0 50%;
}

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  overflow: hidden;
  padding-block: var(--section-y) var(--space-4);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.footer-geometry {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.fg-circle {
  position: absolute;
  top: calc(var(--space-8) * -1);
  right: calc(var(--space-8) * -1);
  width: clamp(180px, 26vw, 320px);
  aspect-ratio: 1;
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-pill);
}
.fg-half {
  position: absolute;
  left: calc(var(--space-6) * -1);
  bottom: 0;
  width: clamp(140px, 18vw, 220px);
  aspect-ratio: 2 / 1;
  border-radius: var(--radius-pill) var(--radius-pill) 0 0;
  background: var(--color-primary);
  opacity: 0.5;
}
.fg-square {
  position: absolute;
  right: 12%;
  bottom: 18%;
  width: 28px;
  height: 28px;
  background: var(--color-contrast-accent);
  transform: rotate(45deg);
}

.footer-inner {
  position: relative;
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--space-6) var(--gutter);
}
.footer-brand {
  grid-column: span 4;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-2);
}
.footer-brand-line {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 900;
  line-height: 1.1;
  color: var(--color-contrast-ink);
}
.footer-brand-note {
  max-width: 32ch;
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 72%, transparent);
}
.footer-nav {
  grid-column: span 5;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}
.footer-contact { grid-column: span 3; }

.footer-col-title {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin-bottom: var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 900;
  letter-spacing: 0.1em;
  color: var(--color-contrast-ink);
}
.footer-col-title::before {
  content: "";
  flex: none;
  width: 10px;
  height: 10px;
  background: var(--color-contrast-accent);
}
.footer-list li + li { margin-top: var(--space-2); }
.footer-list a {
  padding-bottom: 2px;
  border-bottom: var(--border-thin) solid transparent;
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
  transition: color 180ms ease, border-color 180ms ease;
}
.footer-list a:hover {
  color: var(--color-contrast-accent);
  border-bottom-color: var(--color-contrast-accent);
}

.contact-list { display: grid; gap: var(--space-2); }
.contact-row {
  display: grid;
  grid-template-columns: 5.5em minmax(0, 1fr);
  gap: var(--space-1);
  padding-bottom: var(--space-1);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}
.contact-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-contrast-accent);
}
.contact-value {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.6;
  color: var(--color-contrast-ink);
  word-break: break-word;
}
.footer-note {
  margin-top: var(--space-3);
  font-size: var(--text-xs);
  color: color-mix(in srgb, var(--color-contrast-ink) 66%, transparent);
}

.footer-meta {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-2);
  margin-top: var(--space-8);
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  font-size: var(--text-xs);
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}
.footer-legal,
.footer-copy {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .grid-8 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .col-5, .col-6, .col-7 { grid-column: 1 / -1; }

  .footer-inner { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .footer-brand { grid-column: 1 / -1; }
  .footer-nav { grid-column: span 4; }
  .footer-contact { grid-column: span 2; }
}

@media (max-width: 900px) {
  .header-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    padding-top: var(--space-2);
  }
  .header-service { display: none; }
  .nav-toggle { display: inline-flex; }
  .site-nav {
    display: none;
    margin-top: var(--space-2);
  }
  .site-header[data-open="true"] .site-nav { display: block; }
  .nav-list { flex-direction: column; }
  .nav-list > li { display: block; }
  .nav-list a {
    justify-content: flex-start;
    padding: var(--space-3);
    border-bottom: var(--border-thin) solid var(--color-line);
  }
  .nav-list a[aria-current="page"] { border-bottom-color: var(--color-primary); }
}

@media (max-width: 760px) {
  .container { padding-inline: var(--space-2); }
  .section { padding-block: var(--space-8); }
  .section-lg { padding-block: var(--space-8); }
  .grid-8 { grid-template-columns: minmax(0, 1fr); }
  .col-1, .col-2, .col-3, .col-4, .col-5, .col-6, .col-7, .col-8 { grid-column: 1 / -1; }
  .section-head { margin-bottom: var(--space-4); }
  .section-head__meta { margin-left: 0; }

  .footer-inner { grid-template-columns: minmax(0, 1fr); }
  .footer-brand,
  .footer-nav,
  .footer-contact { grid-column: 1 / -1; }
  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .fg-square { display: none; }
}

@media (max-width: 560px) {
  .brand-tagline { display: none; }
  .header-actions .btn-sm { padding: 8px var(--space-2); }
  .nav-toggle { padding: 8px 12px; }
  .display { letter-spacing: -0.01em; }
}

/* ---------- 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
  html[data-js="true"] [data-reveal] {
    opacity: 1;
    transform: none;
  }
}