/* ============================================================
   XBET国际站 · 共享站点样式 /assets/site.css
   深海底色 + 电光青检索主线 + 琥珀橙反馈 + 洋红版本标签
   ============================================================ */

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

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

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

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

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

button { font: inherit; color: inherit; background: none; border: 0; }

/* ---------- 2. 变量 ---------- */
:root {
  /* 色彩 */
  --c-abyss: #061826;
  --c-panel: #0B2239;
  --c-steel: #1C4560;
  --c-ice: #E9F4F8;
  --c-mist: #9DB4C4;
  --c-cyan: #19E3C6;
  --c-amber: #FFB23E;
  --c-magenta: #FF3F8E;
  --c-cyan-soft: #8BF3E6;
  --c-paper: #F2E9D8;

  /* 字体 */
  --font-display: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", "Heiti SC", sans-serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", "SFMono-Regular", "Menlo", "Consolas", "Liberation Mono", monospace;

  /* 尺度 */
  --wrap: 1220px;
  --gutter: clamp(1rem, 4vw, 2.5rem);
  --radius: 2px;

  /* 边框与阴影 */
  --line: 2px solid var(--c-steel);
  --line-thick: 3px solid var(--c-steel);
  --shadow-hard: 8px 8px 0 rgba(6, 24, 38, 0.92);

  /* 动效 */
  --t-fast: 160ms ease;
  --t-base: 200ms ease;
}

/* ---------- 3. 基础排版 ---------- */
body {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.85;
  color: var(--c-ice);
  background-color: var(--c-abyss);
  background-image:
    linear-gradient(rgba(28, 69, 96, 0.32) 1px, transparent 1px),
    linear-gradient(90deg, rgba(28, 69, 96, 0.32) 1px, transparent 1px);
  background-size: 72px 72px;
  background-position: center top;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--c-ice);
  margin-bottom: 0.6em;
}

h1 { font-size: clamp(2.6rem, 7vw, 5.4rem); line-height: 1.03; }
h2 { font-size: clamp(1.9rem, 3.6vw, 3.1rem); }
h3 { font-size: clamp(1.3rem, 2vw, 1.8rem); line-height: 1.25; }
h4 { font-size: 1.125rem; line-height: 1.35; }

p {
  max-width: 38em;
  margin-bottom: 1.1em;
}

p:last-child { margin-bottom: 0; }

a {
  color: var(--c-cyan);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color var(--t-fast);
}

a:hover { color: var(--c-cyan-soft); }

strong, b { font-weight: 700; color: var(--c-ice); }

small { font-size: 0.8em; }

hr { border: 0; }

::selection {
  background: var(--c-cyan);
  color: var(--c-abyss);
}

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

/* ---------- 4. 通用工具 ---------- */
.container,
.header-top__inner,
.masthead__inner,
.primary-nav__inner,
.footer-top,
.footer-legal__inner {
  width: min(var(--wrap), calc(100% - var(--gutter) * 2));
  margin-inline: auto;
}

.mono {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--c-mist);
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--c-cyan);
  margin-bottom: 0.9rem;
}

.section-no {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.4rem, 5vw, 4.2rem);
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--c-steel);
}

.prose { max-width: 42em; }

.site-main { display: block; position: relative; }

#main-content { display: block; }

.divider {
  height: 3px;
  border: 0;
  margin: 2.5rem 0;
  background: linear-gradient(90deg, var(--c-cyan), var(--c-steel) 45%, transparent);
}

/* ---------- 5. 跳过链接 ---------- */
.skip-link {
  position: absolute;
  left: var(--gutter);
  top: -140px;
  z-index: 300;
  padding: 0.75rem 1.15rem;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--c-abyss);
  background: var(--c-cyan);
  border: 2px solid var(--c-cyan-soft);
  border-radius: var(--radius);
  text-decoration: none;
  transition: top var(--t-fast);
}

.skip-link:focus,
.skip-link:focus-visible {
  top: 0.75rem;
  color: var(--c-abyss);
}

/* ---------- 6. 页头 ---------- */
.site-header {
  position: relative;
  z-index: 60;
  background: linear-gradient(180deg, rgba(11, 34, 57, 0.98), rgba(6, 24, 38, 0.98));
  border-bottom: 3px solid var(--c-steel);
}

/* 顶部工具条 */
.header-top {
  background: rgba(6, 24, 38, 0.78);
  border-bottom: 1px solid var(--c-steel);
}

.header-top__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 40px;
  padding-block: 0.35rem;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--c-mist);
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  white-space: nowrap;
}

.status__dot {
  width: 8px;
  height: 8px;
  flex: none;
  border-radius: 50%;
  background: var(--c-amber);
  box-shadow: 0 0 0 3px rgba(255, 178, 62, 0.18);
}

.status__text {
  color: var(--c-mist);
  letter-spacing: 0.12em;
}

.header-top__icp {
  color: var(--c-steel);
  letter-spacing: 0.1em;
  white-space: nowrap;
}

.utility-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.15rem;
}

.utility-links a {
  display: inline-block;
  padding: 0.3rem 0.6rem;
  color: var(--c-mist);
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius);
  transition: color var(--t-fast), background var(--t-fast), border-color var(--t-fast);
}

.utility-links a:hover,
.utility-links a:focus-visible {
  color: var(--c-abyss);
  background: var(--c-cyan);
  border-color: var(--c-cyan);
}

/* 刊头 */
.masthead {
  border-bottom: 2px solid var(--c-steel);
}

.masthead__inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 1rem;
  padding-block: 1.15rem;
}

/* 检索快捷入口 */
.search-shortcut {
  justify-self: start;
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.55rem 0.9rem;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-mist);
  text-decoration: none;
  background: rgba(11, 34, 57, 0.85);
  border: 2px solid var(--c-steel);
  border-radius: var(--radius);
  transition: color var(--t-fast), border-color var(--t-fast), background var(--t-fast), box-shadow var(--t-fast);
}

.search-shortcut__icon {
  position: relative;
  width: 12px;
  height: 12px;
  flex: none;
  border: 2px solid currentColor;
  border-radius: 50%;
}

.search-shortcut__icon::after {
  content: "";
  position: absolute;
  right: -5px;
  bottom: -3px;
  width: 6px;
  height: 2px;
  background: currentColor;
  transform: rotate(45deg);
}

.search-shortcut__text { white-space: nowrap; }

.search-shortcut:hover,
.search-shortcut:focus-visible {
  color: var(--c-cyan);
  border-color: var(--c-cyan);
  background: rgba(25, 227, 198, 0.08);
  box-shadow: 4px 4px 0 rgba(25, 227, 198, 0.16);
}

/* 品牌报头 */
.brand {
  justify-self: center;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 0.45rem;
  text-decoration: none;
  color: var(--c-ice);
  text-align: center;
}

.brand__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.65rem, 3.4vw, 2.4rem);
  line-height: 1;
  letter-spacing: 0.14em;
  color: var(--c-ice);
  transition: color var(--t-fast), text-shadow var(--t-fast);
}

.brand:hover .brand__name,
.brand:focus-visible .brand__name {
  color: var(--c-cyan);
}

.brand__sub {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--c-mist);
  padding-top: 0.45rem;
  border-top: 1px solid var(--c-steel);
  width: 100%;
}

/* 刊头右侧操作 */
.masthead__actions {
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.masthead__cta { white-space: nowrap; }

/* 移动菜单按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.55rem;
  padding: 0.55rem 0.8rem;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-mist);
  background: rgba(11, 34, 57, 0.9);
  border: 2px solid var(--c-steel);
  border-radius: var(--radius);
  cursor: pointer;
  transition: color var(--t-fast), border-color var(--t-fast), background var(--t-fast);
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
  color: var(--c-ice);
  border-color: var(--c-cyan);
  background: rgba(25, 227, 198, 0.08);
}

.nav-toggle[aria-expanded="true"] {
  color: var(--c-amber);
  border-color: var(--c-amber);
  background: rgba(255, 178, 62, 0.1);
}

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 16px;
  flex: none;
}

.nav-toggle__bars span {
  display: block;
  height: 2px;
  width: 100%;
  background: currentColor;
  transition: transform var(--t-fast), opacity var(--t-fast);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:first-child {
  transform: translateY(3px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:last-child {
  transform: translateY(-3px) rotate(-45deg);
}

.nav-toggle__label { white-space: nowrap; }

/* 导航 */
.primary-nav {
  background: rgba(6, 24, 38, 0.62);
  border-top: 1px solid rgba(28, 69, 96, 0.7);
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: stretch;
}

.nav-link {
  position: relative;
  display: block;
  padding: 0.95rem 1.5rem;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--c-mist);
  text-decoration: none;
  transition: color var(--t-fast), background var(--t-fast);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 1.5rem;
  right: 1.5rem;
  bottom: 0.5rem;
  height: 2px;
  background: var(--c-cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--t-fast), background var(--t-fast);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--c-ice);
  background: rgba(25, 227, 198, 0.07);
}

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

.nav-link[aria-current="page"] {
  color: var(--c-cyan);
  background: rgba(25, 227, 198, 0.06);
}

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

/* ---------- 7. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(3rem, 6vw, 5.5rem);
  background-color: var(--c-panel);
  background-image:
    linear-gradient(rgba(28, 69, 96, 0.42) 1px, transparent 1px),
    linear-gradient(90deg, rgba(28, 69, 96, 0.42) 1px, transparent 1px);
  background-size: 48px 48px;
  border-top: 3px solid var(--c-cyan);
  color: var(--c-ice);
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, minmax(0, 0.85fr)) 1.25fr;
  gap: clamp(1.5rem, 3vw, 2.5rem);
  padding-block: clamp(2.5rem, 5vw, 4rem) clamp(2rem, 4vw, 3rem);
}

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

.footer-brand__name {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.5rem;
  letter-spacing: 0.1em;
  line-height: 1.1;
  color: var(--c-ice);
  margin-bottom: 0.85rem;
}

.footer-brand__desc {
  font-size: 14px;
  line-height: 1.85;
  color: var(--c-mist);
  max-width: 22em;
  margin-bottom: 1.1rem;
}

.footer-brand__link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 2px;
}

.footer-brand__link:hover,
.footer-brand__link:focus-visible { color: var(--c-cyan-soft); }

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

.footer-col__title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-mist);
  line-height: 1.4;
  margin-bottom: 1.1rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--c-steel);
}

.footer-links { display: grid; gap: 0.15rem; }

.footer-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.3rem 0;
  font-size: 15px;
  color: var(--c-ice);
  text-decoration: none;
  transition: color var(--t-fast);
}

.footer-links a::before {
  content: "";
  width: 6px;
  height: 6px;
  flex: none;
  background: var(--c-steel);
  transition: background var(--t-fast), transform var(--t-fast);
}

.footer-links a:hover,
.footer-links a:focus-visible { color: var(--c-cyan); }

.footer-links a:hover::before,
.footer-links a:focus-visible::before {
  background: var(--c-cyan);
  transform: translateX(2px);
}

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

.contact-list {
  display: grid;
  gap: 0.7rem;
  font-size: 14px;
}

.contact-list li {
  display: grid;
  grid-template-columns: 3.2rem minmax(0, 1fr);
  gap: 0.6rem;
  align-items: baseline;
}

.contact-list__key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-mist);
}

.contact-list__val {
  color: var(--c-ice);
  line-height: 1.7;
  overflow-wrap: anywhere;
}

.footer-legal {
  border-top: 1px solid var(--c-steel);
  background: rgba(6, 24, 38, 0.72);
}

.footer-legal__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem 1.5rem;
  padding-block: 1.15rem;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--c-mist);
}

.footer-legal__copy { margin: 0; max-width: none; }

.footer-legal__note {
  margin: 0;
  max-width: none;
  color: var(--c-steel);
}

/* ---------- 8. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 0.8rem 1.35rem;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  line-height: 1.4;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--c-abyss);
  background: var(--c-cyan);
  border: 2px solid var(--c-cyan);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background var(--t-fast), color var(--t-fast),
              border-color var(--t-fast), box-shadow var(--t-fast),
              transform var(--t-fast);
}

.btn:hover,
.btn:focus-visible {
  color: var(--c-abyss);
  background: var(--c-cyan-soft);
  border-color: var(--c-cyan-soft);
  box-shadow: 5px 5px 0 rgba(28, 69, 96, 0.95);
  transform: translate(-2px, -2px);
}

.btn:active {
  transform: none;
  box-shadow: none;
}

.btn--ghost {
  color: var(--c-cyan);
  background: transparent;
  border-color: var(--c-cyan);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  color: var(--c-cyan-soft);
  background: rgba(25, 227, 198, 0.12);
  border-color: var(--c-cyan-soft);
}

.btn--amber {
  color: var(--c-amber);
  background: transparent;
  border-color: var(--c-amber);
}

.btn--amber:hover,
.btn--amber:focus-visible {
  color: var(--c-abyss);
  background: var(--c-amber);
  border-color: var(--c-amber);
  box-shadow: 5px 5px 0 rgba(255, 63, 142, 0.35);
}

.btn--sm {
  padding: 0.48rem 0.85rem;
  font-size: 11px;
  letter-spacing: 0.12em;
}

.btn-block {
  display: flex;
  width: 100%;
}

/* ---------- 9. 卡片与标签 ---------- */
.card {
  position: relative;
  padding: clamp(1.2rem, 2.5vw, 1.9rem);
  background: var(--c-panel);
  border: var(--line);
  border-radius: var(--radius);
}

.card--raised { box-shadow: var(--shadow-hard); }

.card--accent {
  border-left: 6px solid var(--c-cyan);
}

.card__meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.07em;
  color: var(--c-mist);
  margin-bottom: 0.8rem;
}

.card__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.25rem;
  line-height: 1.3;
  color: var(--c-ice);
  margin-bottom: 0.6rem;
}

.card__body {
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-mist);
  max-width: none;
  margin: 0;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.2rem 0.55rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  line-height: 1.6;
  white-space: nowrap;
  color: var(--c-mist);
  background: rgba(6, 24, 38, 0.6);
  border: 1px solid var(--c-steel);
  border-radius: var(--radius);
}

.tag--cyan {
  color: var(--c-abyss);
  background: var(--c-cyan);
  border-color: var(--c-cyan);
}

.tag--amber {
  color: var(--c-abyss);
  background: var(--c-amber);
  border-color: var(--c-amber);
}

.tag--magenta {
  color: var(--c-ice);
  background: var(--c-magenta);
  border-color: var(--c-magenta);
}

/* ---------- 10. 媒体容器 ---------- */
.media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background:
    linear-gradient(135deg, rgba(28, 69, 96, 0.92), rgba(11, 34, 57, 0.92)),
    var(--c-panel);
  border: var(--line);
  border-radius: var(--radius);
}

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

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

.media--cut {
  clip-path: polygon(0 0, 100% 0, 100% 82%, 88% 100%, 0 100%);
}

.media__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 0.4rem 0.7rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--c-mist);
  background: rgba(6, 24, 38, 0.88);
  border-top: 1px solid var(--c-steel);
  border-right: 1px solid var(--c-steel);
}

/* ---------- 11. 网格与章节 ---------- */
.grid {
  display: grid;
  gap: clamp(1rem, 2.4vw, 1.75rem);
}

.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, 0.85fr); }
.grid--auto { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

.section {
  padding-block: clamp(3rem, 6vw, 5.5rem);
}

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1.1rem;
  margin-bottom: clamp(1.5rem, 3vw, 2.25rem);
}

/* ---------- 12. 面包屑 ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  padding-block: 1.1rem;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.07em;
  color: var(--c-mist);
  border-bottom: 1px solid var(--c-steel);
}

.breadcrumbs a {
  color: var(--c-mist);
  text-decoration: none;
  transition: color var(--t-fast);
}

.breadcrumbs a:hover,
.breadcrumbs a:focus-visible { color: var(--c-cyan); }

.breadcrumbs__sep {
  color: var(--c-steel);
  user-select: none;
}

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

/* ---------- 13. 滚动进度条 ---------- */
.scroll-progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 3px;
  z-index: 120;
  pointer-events: none;
  background: rgba(28, 69, 96, 0.55);
}

.scroll-progress__bar {
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--c-cyan), var(--c-cyan-soft) 55%, var(--c-amber));
  transition: transform 120ms linear;
}

/* ---------- 14. 响应式 ---------- */
@media (max-width: 1080px) {
  .footer-top {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .footer-brand { grid-column: 1 / -1; }
  .footer-contact { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  body { font-size: 16px; background-size: 56px 56px; }

  .header-top__inner { font-size: 11px; }

  .masthead__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-areas:
      "brand actions"
      "search search";
    row-gap: 0.9rem;
    padding-block: 0.95rem 1rem;
  }

  .brand {
    grid-area: brand;
    justify-self: start;
    align-items: flex-start;
    text-align: left;
  }

  .brand__sub {
    width: auto;
    letter-spacing: 0.22em;
  }

  .masthead__actions { grid-area: actions; }

  .masthead__cta { display: none; }

  .search-shortcut {
    grid-area: search;
    justify-self: stretch;
    justify-content: center;
  }

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

  .primary-nav {
    display: none;
    border-top: 2px solid var(--c-steel);
    background: rgba(6, 24, 38, 0.96);
  }

  .primary-nav[data-open] {
    display: block;
    animation: nav-drop var(--t-base) ease-out;
  }

  .nav-list { flex-direction: column; }

  .nav-list__item { border-bottom: 1px solid rgba(28, 69, 96, 0.65); }

  .nav-link { padding: 1rem 1.25rem; font-size: 14px; letter-spacing: 0.12em; }

  .nav-link::after { left: 1.25rem; right: auto; width: 1.75rem; bottom: 0.75rem; }

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

@keyframes nav-drop {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 720px) {
  .header-top__icp { display: none; }
  .status__text { letter-spacing: 0.06em; }
  .utility-links a { padding: 0.25rem 0.45rem; }
  .brand__name { letter-spacing: 0.1em; }
  .footer-legal__inner { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 640px) {
  .footer-top { grid-template-columns: minmax(0, 1fr); }
  .footer-brand,
  .footer-contact { grid-column: auto; }
}

/* ---------- 15. 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;
    scroll-behavior: auto !important;
  }

  .btn:hover,
  .btn--amber:hover,
  .footer-links a:hover::before,
  .footer-links a:focus-visible::before {
    transform: none;
  }

  .primary-nav[data-open] { animation: none; }
}