/* ==========================================================================
   UC赛场 · /assets/site.css
   共享外壳：设计令牌 / 重置 / 中文排版 / 刊头 / 页脚 / 通用组件
   视觉语言：高原夜赛仪表盘 —— 深空底 + 细网格 + 极细刻度 + 斜切信号色
   ========================================================================== */

/* 1. 设计令牌 -------------------------------------------------------------- */
:root {
  --ink-900: #070B14;
  --ink-800: #0D1524;
  --ink-700: #111C30;
  --line: #2A3A55;
  --line-soft: rgba(42, 58, 85, 0.6);
  --orange: #FF5A1F;
  --cyan: #22D3EE;
  --violet: #8B5CF6;
  --lime: #D7FF3F;
  --warn: #FFB020;
  --text: #F4F7FF;
  --text-2: #A9B6CC;
  --text-3: #7C8AA5;

  --font-display: "Noto Sans SC", "Archivo Black", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --font-serif: "Noto Serif SC", Georgia, "Songti SC", serif;

  --maxw: 1180px;
  --pad: clamp(18px, 4vw, 40px);
  --radius: 2px;
  --ease: cubic-bezier(0.3, 0.7, 0.4, 1);
  --dur: 260ms;
}

/* 2. 重置 ------------------------------------------------------------------ */
*,
*::before,
*::after { box-sizing: border-box; }

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

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

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

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

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

a { color: inherit; }

button { font: inherit; color: inherit; }

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: var(--radius);
}

::selection {
  background: var(--orange);
  color: var(--ink-900);
}

/* 3. 基础排版 -------------------------------------------------------------- */
body {
  min-height: 100vh;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  letter-spacing: 0.01em;
  background-color: var(--ink-900);
  background-image:
    linear-gradient(to right, rgba(42, 58, 85, 0.26) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42, 58, 85, 0.18) 1px, transparent 1px);
  background-size: 96px 96px;
  background-position: center top;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.015em;
  color: var(--text);
}

h1 { font-size: clamp(32px, 6vw, 76px); }
h2 { font-size: clamp(24px, 3.4vw, 40px); }
h3 { font-size: clamp(19px, 2vw, 26px); letter-spacing: -0.01em; }

p { max-width: 38em; }

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

/* 4. 布局工具 -------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--pad);
}

.section { padding-block: clamp(48px, 8vw, 104px); }

.section--band {
  background: var(--ink-800);
  border-block: 1px solid var(--line);
}

.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
  grid-template-columns: minmax(0, 1fr);
}

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

/* 5. 通用组件 -------------------------------------------------------------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.eyebrow::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--orange);
  transform: skewX(-14deg);
}

.panel {
  position: relative;
  padding: clamp(16px, 2.4vw, 26px);
  background: var(--ink-700);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow:
    inset 0 1px 0 rgba(244, 247, 255, 0.04),
    0 24px 48px -40px #000;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.panel:hover {
  border-color: rgba(34, 211, 238, 0.55);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: 0.08em;
  color: var(--text-2);
  background: rgba(17, 28, 48, 0.7);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.tag--orange { color: var(--orange); border-color: rgba(255, 90, 31, 0.45); background: rgba(255, 90, 31, 0.1); }
.tag--cyan   { color: var(--cyan);   border-color: rgba(34, 211, 238, 0.4); background: rgba(34, 211, 238, 0.08); }
.tag--violet { color: #B69CFF;      border-color: rgba(139, 92, 246, 0.45); background: rgba(139, 92, 246, 0.12); }
.tag--lime   { color: var(--lime);   border-color: rgba(215, 255, 63, 0.42); background: rgba(215, 255, 63, 0.1); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.06em;
  color: var(--text);
  text-decoration: none;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.btn--lime {
  color: var(--ink-900);
  background: var(--lime);
  border-color: var(--lime);
}
.btn--lime:hover { box-shadow: 0 0 0 3px rgba(215, 255, 63, 0.22); }

.btn--orange {
  color: var(--ink-900);
  background: var(--orange);
  border-color: var(--orange);
}
.btn--orange:hover { box-shadow: 0 0 0 3px rgba(255, 90, 31, 0.24); }

.btn--ghost:hover {
  color: var(--cyan);
  border-color: var(--cyan);
  background: rgba(34, 211, 238, 0.08);
}

.breadcrumbs {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--text-2);
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.breadcrumbs li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.breadcrumbs li + li::before {
  content: "/";
  color: var(--line);
}

.breadcrumbs a {
  color: var(--text-2);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.breadcrumbs a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.breadcrumbs [aria-current="page"] { color: var(--text); }

.prose {
  max-width: 68ch;
  color: var(--text-2);
  font-size: clamp(15px, 1.05vw, 17px);
  line-height: 1.8;
}

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

.prose h2,
.prose h3 {
  font-style: normal;
  color: var(--text);
  margin-top: 1.9em;
}

.prose h3 { font-size: clamp(18px, 1.7vw, 22px); }

.prose ul,
.prose ol {
  list-style: disc;
  padding-left: 1.3em;
}

.prose ol { list-style: decimal; }

.prose li + li { margin-top: 0.4em; }

.prose a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 211, 238, 0.4);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.prose a:hover { border-bottom-color: var(--cyan); }

.prose strong { color: var(--text); }

.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background-color: var(--ink-700);
  background-image:
    linear-gradient(135deg, rgba(255, 90, 31, 0.16), transparent 46%),
    repeating-linear-gradient(90deg, rgba(42, 58, 85, 0.85) 0 1px, transparent 1px 28px),
    repeating-linear-gradient(0deg, rgba(42, 58, 85, 0.65) 0 1px, transparent 1px 28px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.media-frame > img,
.media-frame > picture,
.media-frame > picture > img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

.media-frame__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  line-height: 1.6;
  letter-spacing: 0.06em;
  color: var(--text-2);
}

.kpi {
  display: grid;
  gap: 3px;
}

.kpi__value {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.kpi__label {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-2);
}

.toc {
  display: grid;
  gap: 2px;
  padding-left: 14px;
  border-left: 1px solid var(--line);
}

.toc__link {
  display: block;
  margin-left: -16px;
  padding: 6px 0 6px 16px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-2);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.toc__link:hover { color: var(--text); }

.toc__link[aria-current="true"] {
  color: var(--lime);
  border-left-color: var(--lime);
  background: rgba(215, 255, 63, 0.06);
}

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

/* 6. 刊头 ------------------------------------------------------------------ */
.site-header {
  position: relative;
  z-index: 40;
  background:
    radial-gradient(62% 130% at 50% -40%, rgba(255, 90, 31, 0.22), transparent 70%),
    radial-gradient(40% 90% at 88% -10%, rgba(34, 211, 238, 0.12), transparent 72%),
    linear-gradient(180deg, rgba(13, 21, 36, 0.96), rgba(7, 11, 20, 0.98));
  border-bottom: 1px solid var(--line);
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -72px;
  z-index: 80;
  padding: 11px 18px;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--ink-900);
  text-decoration: none;
  background: var(--lime);
  border-radius: var(--radius);
  transition: top var(--dur) var(--ease);
}

.skip-link:focus { top: 12px; }

.scroll-meter {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 60;
  background: rgba(42, 58, 85, 0.35);
  pointer-events: none;
}

.scroll-meter__fill {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan), var(--orange) 58%, var(--lime));
  transition: transform 140ms linear;
}

.masthead {
  position: relative;
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--pad);
}

.masthead__bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 18px;
  padding-block: 12px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-2);
  border-bottom: 1px solid var(--line-soft);
}

.masthead__kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  max-width: none;
  margin: 0;
}

.pulse {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 2px rgba(215, 255, 63, 0.18);
  animation: uc-pulse 2.4s ease-in-out infinite;
}

@keyframes uc-pulse {
  0%, 100% { box-shadow: 0 0 0 2px rgba(215, 255, 63, 0.18); }
  50%      { box-shadow: 0 0 0 6px rgba(215, 255, 63, 0.05); }
}

.masthead__utility {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
}

.util-link {
  position: relative;
  color: var(--text-2);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.util-link::before {
  content: "//";
  margin-right: 6px;
  color: var(--line);
}

.util-link:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.masthead__brandrow {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 12px;
  padding-block: 16px 6px;
}

.brand {
  grid-column: 2;
  display: grid;
  justify-items: center;
  gap: 6px;
  text-align: center;
  text-decoration: none;
}

.brand__mark {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(30px, 5vw, 52px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--text);
  text-shadow: 0 0 30px rgba(34, 211, 238, 0.2);
}

.brand__mark::before {
  content: "";
  display: inline-block;
  width: 0.15em;
  height: 0.72em;
  margin-right: 0.22em;
  background: var(--orange);
  transform: skewX(-14deg);
}

.brand__line {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--text-2);
}

.masthead__cta {
  grid-column: 3;
  grid-row: 1;
  justify-self: end;
  padding: 10px 16px;
  font-size: 13px;
}

.nav-toggle {
  grid-column: 1;
  grid-row: 1;
  justify-self: start;
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 11px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--text);
  background: rgba(17, 28, 48, 0.8);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.nav-toggle:hover,
.nav-toggle[aria-expanded="true"] {
  color: var(--lime);
  border-color: var(--lime);
}

.nav-toggle__bars {
  display: grid;
  gap: 3px;
  width: 16px;
}

.nav-toggle__bars i {
  display: block;
  height: 2px;
  background: currentColor;
}

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

.site-nav { display: block; }

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}

.site-nav__list li { display: flex; }

.site-nav__list li + li a { border-left: 1px solid rgba(42, 58, 85, 0.55); }

.site-nav__list a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 16px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text-2);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.site-nav__idx {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--line);
  transition: color var(--dur) var(--ease);
}

.site-nav__list a:hover {
  color: var(--text);
  background: rgba(34, 211, 238, 0.06);
  border-bottom-color: var(--cyan);
}

.site-nav__list a:hover .site-nav__idx { color: var(--cyan); }

.site-nav__list a[aria-current="page"] {
  color: var(--text);
  background: rgba(255, 90, 31, 0.1);
  border-bottom-color: var(--orange);
}

.site-nav__list a[aria-current="page"] .site-nav__idx { color: var(--orange); }

.masthead__ruler {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-block: 9px 11px;
  border-top: 1px solid var(--line-soft);
}

.ruler__ticks {
  flex: 1 1 auto;
  height: 8px;
  background: repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 12px);
  opacity: 0.85;
}

.ruler__status {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--warn);
  white-space: nowrap;
}

.ruler__status::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--warn);
  transform: skewX(-14deg);
}

/* 7. 页脚 ------------------------------------------------------------------ */
.site-footer {
  position: relative;
  z-index: 1;
  margin-top: clamp(48px, 8vw, 96px);
  color: var(--text);
  background: linear-gradient(180deg, var(--ink-800), var(--ink-900) 72%);
  border-top: 1px solid var(--line);
}

.footer__cut {
  height: 10px;
  background: repeating-linear-gradient(
    90deg,
    var(--orange) 0 22px,
    transparent 22px 26px,
    var(--cyan) 26px 30px,
    transparent 30px 56px
  );
  opacity: 0.85;
}

.footer__inner {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: clamp(32px, 5vw, 56px) var(--pad) 26px;
}

.footer__top {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 0.8fr 1.3fr;
  gap: clamp(20px, 3vw, 40px);
  align-items: start;
}

.footer__summary {
  margin-top: 14px;
  max-width: 32ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-2);
}

.footer__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.brand--footer {
  grid-column: auto;
  justify-items: start;
  text-align: left;
}

.brand--footer .brand__mark { font-size: clamp(26px, 3.4vw, 36px); }

.footer__col { display: block; }

.footer__col-title {
  margin-bottom: 14px;
  padding-bottom: 10px;
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 12px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-2);
  border-bottom: 1px solid var(--line);
}

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

.footer__links a {
  display: inline-block;
  padding: 5px 0;
  font-size: 14px;
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer__links a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.footer__contact {
  padding: clamp(14px, 2vw, 20px);
  background: rgba(17, 28, 48, 0.72);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.footer__contact-row {
  display: grid;
  grid-template-columns: 5.2em minmax(0, 1fr);
  gap: 10px;
  padding: 9px 0;
  font-size: 13px;
  line-height: 1.65;
  border-bottom: 1px dashed rgba(42, 58, 85, 0.7);
}

.footer__contact-row:last-child { border-bottom: 0; padding-bottom: 0; }

.footer__label {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.footer__value {
  color: var(--text-2);
  overflow-wrap: anywhere;
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  margin-left: 4px;
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--cyan);
  background: transparent;
  border: 1px solid rgba(34, 211, 238, 0.4);
  border-radius: var(--radius);
  cursor: pointer;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.copy-btn:hover {
  color: var(--ink-900);
  background: var(--cyan);
  border-color: var(--cyan);
}

.copy-btn[data-copied] {
  color: var(--ink-900);
  background: var(--lime);
  border-color: var(--lime);
}

.footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  margin-top: clamp(24px, 4vw, 40px);
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  line-height: 1.7;
  color: var(--text-2);
}

.footer__legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.footer__legal-links a {
  color: var(--text-2);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer__legal-links a:hover {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.footer__legal-meta {
  max-width: none;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--text-3);
}

/* 8. 响应式 ---------------------------------------------------------------- */
@media (max-width: 980px) {
  .footer__top { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer__contact { grid-column: 1 / -1; }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 860px) {
  .nav-toggle { display: inline-flex; }

  .site-nav {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    z-index: 50;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
    padding: 8px var(--pad) 18px;
    background: var(--ink-800);
    border-block: 1px solid var(--line);
    box-shadow: 0 34px 64px -28px #000;
  }

  .site-nav[data-open] { display: block; }

  .site-nav__list { display: block; }

  .site-nav__list li + li a {
    border-left: 0;
    border-top: 1px solid rgba(42, 58, 85, 0.55);
  }

  .site-nav__list a { padding: 15px 4px; }

  .masthead__bar { font-size: 10px; letter-spacing: 0.12em; }
  .masthead__utility { gap: 12px; }

  .masthead__brandrow { padding-block: 12px 4px; gap: 8px; }
  .masthead__cta { padding: 9px 12px; font-size: 12px; letter-spacing: 0.02em; }

  .ruler__status { font-size: 10px; letter-spacing: 0.08em; }
}

@media (max-width: 720px) {
  .grid--2, .grid--3 { grid-template-columns: minmax(0, 1fr); }
  .footer__top { grid-template-columns: minmax(0, 1fr); }
  .footer__contact-row { grid-template-columns: minmax(0, 1fr); gap: 2px; }
  .footer__legal { justify-content: flex-start; }
}

@media (max-width: 420px) {
  .brand__line { font-size: 10px; letter-spacing: 0.14em; }
  .masthead__cta { padding: 8px 10px; font-size: 11px; }
  .nav-toggle { padding: 7px 9px; font-size: 11px; }
}

/* 9. 减少动效 -------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}