/* ==========================================================================
   开博赛场 · 共享 Site Kit
   /assets/site.css
   ========================================================================== */

/* ---------- 1. 变量 ---------- */
:root {
  --frost: #F4FAFF;
  --ice: #8FD8FF;
  --cyan: #20F0D0;
  --deep: #071A2F;
  --orange: #FF6B2C;
  --rock: #3A444A;
  --moss: #6F7F63;
  --clay: #B96A4B;
  --sand: #EFE8DA;
  --ink: #0B1724;

  --deep-a10: rgba(7, 26, 47, 0.1);
  --deep-a16: rgba(7, 26, 47, 0.16);
  --deep-a32: rgba(7, 26, 47, 0.32);
  --ice-a22: rgba(143, 216, 255, 0.22);
  --cyan-a16: rgba(32, 240, 208, 0.16);
  --cyan-a55: rgba(32, 240, 208, 0.55);

  --font-sans: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --width: 1180px;
  --gutter: clamp(1rem, 4vw, 3rem);
  --header-h: 72px;

  --r-sm: 4px;
  --r-md: 10px;
  --r-lg: 18px;

  --dur: 320ms;
  --dur-fast: 180ms;
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);

  --shadow-glass: 0 1px 0 rgba(255, 255, 255, 0.65) inset, 0 18px 40px -30px rgba(7, 26, 47, 0.6);
}

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

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: clamp(15px, 0.42vw + 14px, 17px);
  line-height: 1.75;
  color: var(--ink);
  background-color: var(--frost);
  background-image:
    radial-gradient(1180px 620px at 10% -12%, rgba(143, 216, 255, 0.36), transparent 62%),
    radial-gradient(900px 540px at 94% 2%, rgba(32, 240, 208, 0.14), transparent 60%),
    repeating-linear-gradient(112deg, rgba(7, 26, 47, 0.028) 0 1px, transparent 1px 7px);
  background-attachment: fixed;
  overflow-x: hidden;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-weight: 800;
  letter-spacing: -0.015em;
  line-height: 1.25;
  color: var(--deep);
}

p, figure, blockquote, dl, dd {
  margin: 0;
}

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

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

a {
  color: inherit;
}

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

:focus-visible {
  outline: 3px solid var(--cyan);
  outline-offset: 2px;
  box-shadow: 0 0 0 5px rgba(255, 107, 44, 0.72);
  border-radius: 2px;
}

/* ---------- 3. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 0.5rem;
  left: 0.5rem;
  z-index: 200;
  padding: 0.62rem 1.05rem;
  background: var(--deep);
  color: var(--frost);
  font-size: 0.86rem;
  font-weight: 700;
  text-decoration: none;
  border-radius: var(--r-sm);
  border-left: 3px solid var(--orange);
  transform: translateY(-180%);
  transition: transform var(--dur-fast) var(--ease);
}

.skip-link:focus {
  transform: translateY(0);
  color: var(--frost);
}

/* ---------- 4. 头部框架 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(244, 250, 255, 0.86);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  backdrop-filter: blur(16px) saturate(150%);
  border-bottom: 1px solid var(--deep-a16);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.7) inset;
}

.site-header::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--orange) 0%, rgba(255, 107, 44, 0.18) 100%);
  pointer-events: none;
}

.site-header::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  height: 1px;
  width: min(38vw, 340px);
  background: linear-gradient(90deg, transparent, var(--cyan));
  pointer-events: none;
}

.header-frame {
  position: relative;
  display: flex;
  align-items: center;
  gap: clamp(0.65rem, 1.8vw, 1.6rem);
  width: 100%;
  max-width: calc(var(--width) + var(--gutter) * 2);
  min-height: var(--header-h);
  margin-inline: auto;
  padding: 0.5rem var(--gutter) 0.5rem calc(var(--gutter) + 0.35rem);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  min-width: 0;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--deep);
}

.brand-glyph {
  position: relative;
  flex: none;
  width: 28px;
  height: 28px;
  border-radius: 3px;
  background: linear-gradient(140deg, #0d3552, var(--deep));
  transform: skewX(-12deg);
  box-shadow: inset 0 0 0 1px var(--cyan-a55);
}

.brand-glyph::after {
  content: "";
  position: absolute;
  inset: 7px 6px 7px 11px;
  background: var(--cyan);
  clip-path: polygon(0 0, 100% 50%, 0 100%);
  opacity: 0.92;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
  min-width: 0;
}

.brand-name {
  font-size: 1.05rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--deep);
  white-space: nowrap;
}

.brand-tag {
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.16em;
  color: var(--moss);
  text-transform: uppercase;
  white-space: nowrap;
}

.brand-tagline {
  padding-left: 0.85rem;
  border-left: 1px solid var(--deep-a16);
  font-size: 0.74rem;
  font-weight: 500;
  color: var(--rock);
  white-space: nowrap;
}

/* 导航 */
.site-nav {
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 0.12rem;
}

.nav-item {
  display: flex;
}

.nav-link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
  padding: 0.42rem 0.62rem;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  font-size: 0.83rem;
  font-weight: 600;
  color: var(--rock);
  text-decoration: none;
  white-space: nowrap;
  box-shadow: inset 0 -2px 0 0 transparent;
  transition:
    color var(--dur) var(--ease),
    background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.nav-index {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.06em;
  color: var(--moss);
  transition: color var(--dur) var(--ease);
}

.nav-link:hover {
  color: var(--deep);
  background: var(--ice-a22);
}

.nav-link:hover .nav-index {
  color: var(--clay);
}

.nav-link[aria-current="page"] {
  color: var(--deep);
  background: var(--cyan-a16);
  border-color: var(--cyan-a55);
  box-shadow: inset 0 -2px 0 0 var(--orange);
}

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

/* 快捷入口 */
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex: none;
  padding-left: clamp(0.4rem, 1.4vw, 1rem);
  border-left: 1px solid var(--deep-a16);
}

.action-link {
  padding: 0.42rem 0.5rem;
  border-radius: var(--r-sm);
  font-size: 0.79rem;
  font-weight: 600;
  color: var(--rock);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.action-link:hover {
  color: var(--deep);
  background: rgba(143, 216, 255, 0.3);
}

.action-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.5rem 0.95rem;
  background: var(--orange);
  color: #0B1724;
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  text-decoration: none;
  white-space: nowrap;
  border: 1px solid rgba(11, 23, 36, 0.22);
  border-radius: var(--r-sm);
  box-shadow: inset 0 -3px 0 rgba(7, 26, 47, 0.26);
  transition:
    background-color var(--dur) var(--ease),
    transform var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.action-cta:hover {
  background: #FF8347;
  transform: translateY(-1px);
  box-shadow: 0 12px 24px -14px rgba(255, 107, 44, 0.95), inset 0 -3px 0 rgba(7, 26, 47, 0.26);
}

/* 滚动进度 */
.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan), var(--ice) 55%, var(--orange));
  pointer-events: none;
  will-change: transform;
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.45rem;
  margin-left: auto;
  padding: 0.46rem 0.72rem;
  background: rgba(7, 26, 47, 0.06);
  border: 1px solid var(--deep-a16);
  border-radius: var(--r-sm);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--deep);
  cursor: pointer;
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.nav-toggle:hover {
  background: var(--cyan-a16);
  border-color: var(--cyan-a55);
}

.nav-toggle-bars {
  position: relative;
  display: block;
  width: 16px;
  height: 10px;
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--deep);
  transition: transform var(--dur) var(--ease);
}

.nav-toggle-bars::before { top: 0; }
.nav-toggle-bars::after { bottom: 0; }

.site-header[data-open] .nav-toggle-bars::before {
  transform: translateY(4px) rotate(45deg);
}

.site-header[data-open] .nav-toggle-bars::after {
  transform: translateY(-4px) rotate(-45deg);
}

/* ---------- 5. 页脚 ---------- */
.site-footer {
  position: relative;
  isolation: isolate;
  margin-top: clamp(3.5rem, 8vw, 7rem);
  overflow: hidden;
  color: rgba(244, 250, 255, 0.76);
  background: linear-gradient(170deg, #08203A 0%, var(--deep) 44%, #04101D 100%);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image: repeating-linear-gradient(115deg, rgba(32, 240, 208, 0.075) 0 1px, transparent 1px 15px);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.95), transparent 72%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.95), transparent 72%);
}

.site-footer::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--ice) 42%, transparent 88%);
}

.footer-inner {
  display: grid;
  grid-template-columns:
    minmax(230px, 1.45fr)
    repeat(3, minmax(104px, 0.72fr))
    minmax(215px, 1.15fr);
  gap: clamp(1.4rem, 3vw, 2.75rem);
  width: 100%;
  max-width: calc(var(--width) + var(--gutter) * 2);
  margin-inline: auto;
  padding: clamp(2.4rem, 5vw, 3.9rem) var(--gutter) clamp(1.6rem, 3vw, 2.4rem);
}

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

.footer-brand-name {
  font-size: 1.4rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--frost);
}

.footer-brand-tag {
  margin-top: 0.2rem;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.footer-note {
  margin-top: 0.9rem;
  max-width: 34ch;
  font-size: 0.84rem;
  line-height: 1.78;
  color: rgba(244, 250, 255, 0.62);
}

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

.footer-col-title {
  margin-bottom: 0.85rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(143, 216, 255, 0.24);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.13em;
  color: var(--ice);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.footer-link {
  display: inline-block;
  padding: 0.2rem 0;
  font-size: 0.87rem;
  color: rgba(244, 250, 255, 0.72);
  text-decoration: none;
  transition: color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.footer-link:hover {
  color: var(--cyan);
  transform: translateX(3px);
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  min-width: 0;
}

.contact-row {
  display: flex;
  flex-direction: column;
  gap: 0.02rem;
}

.contact-label {
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(143, 216, 255, 0.78);
}

.contact-value {
  font-size: 0.84rem;
  line-height: 1.6;
  color: rgba(244, 250, 255, 0.85);
  word-break: break-word;
}

.contact-value--mono {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem 1.6rem;
  width: 100%;
  max-width: calc(var(--width) + var(--gutter) * 2);
  margin-inline: auto;
  padding: 1.05rem var(--gutter);
  border-top: 1px solid rgba(143, 216, 255, 0.18);
  font-size: 0.75rem;
  color: rgba(244, 250, 255, 0.54);
}

.footer-copy {
  font-family: var(--font-mono);
  letter-spacing: 0.03em;
}

.footer-icp {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  color: rgba(143, 216, 255, 0.92);
}

.footer-icp::before {
  content: "";
  display: inline-block;
  width: 14px;
  height: 2px;
  margin-right: 0.5rem;
  vertical-align: middle;
  background: var(--orange);
}

/* ---------- 6. 布局容器与网格 ---------- */
.shell {
  width: 100%;
  max-width: var(--width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.shell--narrow {
  max-width: 820px;
}

.section {
  padding-block: clamp(2.5rem, 6vw, 4.5rem);
}

.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--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* ---------- 7. 排版辅助 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--moss);
}

.eyebrow::before {
  content: "";
  flex: none;
  width: 22px;
  height: 2px;
  background: var(--orange);
}

.label-mono {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--moss);
}

.lede {
  max-width: 62ch;
  font-size: clamp(1rem, 0.5vw + 0.9rem, 1.14rem);
  line-height: 1.8;
  color: var(--rock);
}

.rule-line {
  height: 1px;
  border: 0;
  margin: 0;
  background: linear-gradient(90deg, var(--deep-a32), transparent);
}

/* ---------- 8. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.72rem 1.35rem;
  font-size: 0.9rem;
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  cursor: pointer;
  transition:
    transform var(--dur) var(--ease),
    background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease),
    color var(--dur) var(--ease);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn--primary {
  background: var(--orange);
  color: #0B1724;
  box-shadow: 0 12px 26px -18px rgba(255, 107, 44, 0.95);
}

.btn--primary:hover {
  background: #FF8347;
}

.btn--ghost {
  background: transparent;
  color: var(--deep);
  border-color: var(--deep-a32);
}

.btn--ghost:hover {
  border-color: var(--cyan-a55);
  background: var(--cyan-a16);
}

.btn--quiet {
  background: rgba(7, 26, 47, 0.06);
  color: var(--deep);
}

.btn--quiet:hover {
  background: rgba(7, 26, 47, 0.11);
}

/* ---------- 9. 面包屑 ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--rock);
}

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

.crumb:hover {
  color: var(--deep);
  border-bottom-color: var(--cyan);
}

.crumb[aria-current="page"] {
  color: var(--clay);
  border-bottom-color: transparent;
}

.crumb-sep {
  color: var(--moss);
}

/* ---------- 10. 媒体容器基础 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-md);
  border: 1px solid var(--deep-a16);
  background:
    linear-gradient(135deg, rgba(143, 216, 255, 0.3), rgba(7, 26, 47, 0.14)),
    var(--sand);
  box-shadow: var(--shadow-glass);
}

.media-frame > img {
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 16 / 10;
  filter: saturate(0.94) contrast(1.04);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(112deg, rgba(255, 255, 255, 0.42) 0%, rgba(255, 255, 255, 0) 40%);
  mix-blend-mode: screen;
}

.media-frame--wide > img { aspect-ratio: 21 / 9; }
.media-frame--tall > img { aspect-ratio: 3 / 4; }
.media-frame--square > img { aspect-ratio: 1 / 1; }

.media-caption {
  margin-top: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--moss);
}

/* ---------- 11. 数据与标签 ---------- */
.stat {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.stat-value {
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 2.2vw, 2rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--deep);
}

.stat-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--moss);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.16rem 0.55rem;
  border-radius: 999px;
  border: 1px solid rgba(143, 216, 255, 0.7);
  background: rgba(143, 216, 255, 0.3);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--deep);
  text-decoration: none;
}

.tag--moss {
  background: rgba(111, 127, 99, 0.16);
  border-color: rgba(111, 127, 99, 0.48);
  color: #3d4834;
}

.tag--clay {
  background: rgba(185, 106, 75, 0.14);
  border-color: rgba(185, 106, 75, 0.48);
  color: #7c4128;
}

.tag--cyan {
  background: rgba(32, 240, 208, 0.18);
  border-color: var(--cyan-a55);
  color: #0a4a45;
}

.tag--signal {
  background: var(--orange);
  border-color: var(--orange);
  color: #0B1724;
}

/* ---------- 12. 滚动显现 ---------- */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity 420ms var(--ease) var(--reveal-delay, 0ms),
    transform 420ms var(--ease) var(--reveal-delay, 0ms);
}

html.js [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* ---------- 13. 响应式 ---------- */
@media (max-width: 1200px) {
  .brand-tagline {
    display: none;
  }
}

@media (max-width: 1080px) {
  .nav-index {
    display: none;
  }
  .action-link {
    display: none;
  }
  .footer-inner {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .footer-brand,
  .footer-contact {
    grid-column: 1 / -1;
  }
}

@media (max-width: 960px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin-left: 0;
    display: block;
    padding: 0.7rem var(--gutter) 1.2rem;
    background: rgba(244, 250, 255, 0.97);
    -webkit-backdrop-filter: blur(18px) saturate(150%);
    backdrop-filter: blur(18px) saturate(150%);
    border-top: 1px solid var(--deep-a16);
    border-bottom: 1px solid var(--deep-a16);
    box-shadow: 0 26px 40px -32px rgba(7, 26, 47, 0.9);
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    visibility: hidden;
    opacity: 0;
    transform: translateY(-10px);
    pointer-events: none;
    transition:
      opacity var(--dur) var(--ease),
      transform var(--dur) var(--ease),
      visibility 0s linear var(--dur);
  }

  .site-header[data-open] .site-nav {
    visibility: visible;
    opacity: 1;
    transform: none;
    pointer-events: auto;
    transition-delay: 0s;
  }

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

  .nav-item {
    display: block;
  }

  .nav-link {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.75rem;
    padding: 0.78rem 0.4rem;
    font-size: 0.98rem;
    border: 0;
    border-bottom: 1px solid var(--deep-a10);
    border-radius: 0;
    box-shadow: none;
  }

  .nav-index {
    display: inline;
    order: 2;
    color: var(--moss);
  }

  .nav-link[aria-current="page"] {
    background: transparent;
    border-color: transparent;
    border-bottom: 1px solid var(--cyan-a55);
    box-shadow: inset 3px 0 0 0 var(--orange);
    padding-left: 0.75rem;
  }

  .header-actions {
    border-left: 0;
    padding-left: 0;
  }
}

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

@media (max-width: 1024px) {
  .grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

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

@media (max-width: 680px) {
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 620px) {
  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
  }
  .footer-base {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 560px) {
  .brand-tag {
    display: none;
  }
  .brand-name {
    font-size: 0.98rem;
  }
  .action-cta {
    padding: 0.46rem 0.72rem;
    font-size: 0.78rem;
  }
  .nav-toggle {
    padding: 0.42rem 0.6rem;
  }
  .nav-toggle-label {
    display: none;
  }
}

/* ---------- 14. 减少动效 ---------- */
@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;
  }

  html.js [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }

  .btn:hover,
  .footer-link:hover,
  .action-cta:hover,
  .nav-link:hover {
    transform: none;
  }
}