/* ============================================================
   大江赛场 · 共享外壳样式  /assets/site.css
   ============================================================ */

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

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

body,
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; }

:where(a, button, [tabindex]):focus-visible {
  outline: 2px solid #22E0C4;
  outline-offset: 3px;
  border-radius: 2px;
}

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

/* ---------- 2. 变量 ---------- */
:root {
  /* 色彩 */
  --c-900: #06233F;
  --c-700: #0E3E6B;
  --c-400: #2C74B3;
  --c-orange: #FF6A13;
  --c-orange-soft: #FFB27A;
  --c-cyan: #22E0C4;
  --c-cyan-soft: #C9FBF2;
  --c-paper: #F5F7FA;
  --c-ink: #1B2733;
  --c-muted: #6B7B8C;
  --c-alert: #E8452C;
  --c-white: #FFFFFF;

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

  --fs-1: clamp(2.5rem, 5.6vw, 4rem);
  --fs-2: clamp(1.9rem, 4vw, 2.75rem);
  --fs-3: clamp(1.45rem, 2.6vw, 1.875rem);
  --fs-4: 1.375rem;
  --fs-5: 1.125rem;
  --fs-body: 1rem;
  --fs-sm: 0.875rem;
  --fs-xs: 0.75rem;

  --lh-body: 1.75;
  --lh-tight: 1.15;

  /* 尺度 */
  --gutter: clamp(16px, 3.4vw, 44px);
  --container: 1280px;
  --header-h: 72px;
  --radius: 2px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur: 200ms;
  --shadow-lift: 0 24px 48px -32px rgba(6, 35, 63, 0.65);
}

/* ---------- 3. 中文排版与基础 ---------- */
body {
  background-color: var(--c-paper);
  color: var(--c-ink);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  font-weight: 400;
  line-height: var(--lh-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

@media (max-width: 640px) {
  body { font-size: 0.9375rem; line-height: 1.8; }
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 900;
  line-height: var(--lh-tight);
  letter-spacing: -0.02em;
  color: inherit;
  text-wrap: balance;
}

h1 { font-size: var(--fs-1); }
h2 { font-size: var(--fs-2); }
h3 { font-size: var(--fs-3); }
h4 { font-size: var(--fs-4); }
h5 { font-size: var(--fs-5); }

strong { font-weight: 700; }

/* ---------- 4. 布局容器与栅格 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.grid {
  display: grid;
  gap: clamp(16px, 2vw, 28px);
}

.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

.grid-2  { grid-column: span 2; }
.grid-3  { grid-column: span 3; }
.grid-4  { grid-column: span 4; }
.grid-5  { grid-column: span 5; }
.grid-6  { grid-column: span 6; }
.grid-7  { grid-column: span 7; }
.grid-8  { grid-column: span 8; }
.grid-12 { grid-column: 1 / -1; }

@media (max-width: 1024px) {
  .grid-5, .grid-6, .grid-7, .grid-8 { grid-column: span 12; }
  .grid-3, .grid-4 { grid-column: span 6; }
  .grid-2 { grid-column: span 6; }
}

@media (max-width: 640px) {
  .grid--12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .grid-2, .grid-3, .grid-4, .grid-5, .grid-6, .grid-7, .grid-8 { grid-column: span 6; }
}

.section { padding-block: clamp(48px, 7vw, 96px); }
.section--dark { background-color: var(--c-900); color: rgba(255, 255, 255, 0.82); }
.section--mist { background-color: var(--c-paper); }

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 46px;
  padding: 0.78rem 1.5rem;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.01em;
  text-decoration: none;
  text-align: center;
  color: var(--c-900);
  background-color: var(--c-orange);
  border: 1px solid transparent;
  border-radius: var(--radius);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%);
  cursor: pointer;
  transition: background-color var(--dur) var(--ease),
              color var(--dur) var(--ease),
              transform var(--dur) var(--ease);
}

.btn:hover { background-color: var(--c-orange-soft); }
.btn:active { transform: translateY(1px); }
.btn:focus-visible { outline: none; box-shadow: 0 0 0 3px rgba(34, 224, 196, 0.6); }

.btn--accent { background-color: var(--c-orange); color: var(--c-900); }
.btn--accent:hover { background-color: var(--c-orange-soft); }

.btn--ghost {
  background-color: transparent;
  color: var(--c-white);
  border-color: rgba(255, 255, 255, 0.34);
}
.btn--ghost:hover {
  background-color: rgba(34, 224, 196, 0.14);
  border-color: var(--c-cyan);
  color: var(--c-white);
}

.btn--outline {
  background-color: transparent;
  color: var(--c-900);
  border-color: var(--c-900);
}
.btn--outline:hover {
  background-color: var(--c-900);
  color: var(--c-white);
}

.btn--sm { min-height: 40px; padding: 0.55rem 1.05rem; font-size: 0.875rem; }
.btn--block { width: 100%; }

/* ---------- 6. 索引与标签 ---------- */
.eyebrow {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-400);
}
.eyebrow::before {
  content: "";
  flex: 0 0 auto;
  width: 26px;
  height: 2px;
  background-color: var(--c-orange);
}

.label-mono {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-400);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.22rem 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-900);
  background-color: var(--c-cyan-soft);
  border-radius: 1px;
}
.tag--accent { background-color: var(--c-orange); color: var(--c-900); }
.tag--dark { background-color: rgba(255, 255, 255, 0.1); color: var(--c-cyan); }

/* ---------- 7. 卡片 ---------- */
.card {
  position: relative;
  padding: clamp(18px, 2.2vw, 28px);
  background-color: var(--c-white);
  border: 1px solid rgba(27, 39, 51, 0.1);
  border-radius: var(--radius);
}

.card--dark {
  background-color: var(--c-700);
  border-color: rgba(34, 224, 196, 0.26);
  color: rgba(255, 255, 255, 0.82);
}

.card--glass {
  background-color: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(34, 224, 196, 0.28);
  -webkit-backdrop-filter: blur(12px) saturate(140%);
  backdrop-filter: blur(12px) saturate(140%);
  color: var(--c-white);
}

/* ---------- 8. 正文 / 面包屑 ---------- */
.prose {
  max-width: 68ch;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--c-ink);
}
.prose > * + * { margin-top: 1.15em; }
.prose h2 { font-size: var(--fs-3); margin-top: 2.1em; }
.prose h3 { font-size: var(--fs-5); margin-top: 1.7em; }
.prose ul, .prose ol { padding-left: 1.3em; list-style: revert; }
.prose li + li { margin-top: 0.4em; }
.prose a { color: var(--c-700); text-underline-offset: 3px; }
.prose a:hover { color: var(--c-orange); }
.prose strong { color: var(--c-900); }
.prose code {
  padding: 0.1em 0.4em;
  font-family: var(--font-mono);
  font-size: 0.9em;
  background-color: var(--c-cyan-soft);
  color: var(--c-900);
}

.prose--on-dark { color: rgba(255, 255, 255, 0.82); }
.prose--on-dark h2,
.prose--on-dark h3,
.prose--on-dark strong { color: var(--c-white); }
.prose--on-dark a { color: var(--c-cyan); }
.prose--on-dark code { background-color: rgba(34, 224, 196, 0.16); color: var(--c-cyan-soft); }

.breadcrumbs {
  padding-block: 1rem;
  font-size: 0.8125rem;
  color: var(--c-muted);
}
.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
}
.breadcrumbs__list li { display: flex; align-items: center; gap: 0.45rem; }
.breadcrumbs__list li + li::before {
  content: "/";
  font-family: var(--font-mono);
  color: var(--c-400);
}
.breadcrumbs a { color: var(--c-400); text-decoration: none; }
.breadcrumbs a:hover { color: var(--c-orange); text-decoration: underline; }
.breadcrumbs [aria-current="page"] { color: var(--c-ink); font-weight: 500; }

/* ---------- 9. 图片容器基础 ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  isolation: isolate;
  aspect-ratio: 16 / 10;
  background-image: linear-gradient(135deg, var(--c-700), var(--c-900));
  border-radius: var(--radius);
}
.media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: contrast(1.06) saturate(1.08);
}
.media::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(180deg, rgba(6, 35, 63, 0) 42%, rgba(6, 35, 63, 0.58) 100%);
  pointer-events: none;
}
.media--wide { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 3 / 4; }
.media--square { aspect-ratio: 1 / 1; }

.media__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 1;
  padding: 0.55rem 0.8rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--c-cyan-soft);
  background-color: rgba(6, 35, 63, 0.7);
}

/* ---------- 10. 展开组 ---------- */
.expand { border-top: 1px solid rgba(27, 39, 51, 0.12); }
.expand:last-of-type { border-bottom: 1px solid rgba(27, 39, 51, 0.12); }

.expand__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: 100%;
  padding: 1.05rem 0;
  text-align: left;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--c-900);
  cursor: pointer;
  transition: color var(--dur) var(--ease);
}
.expand__trigger:hover { color: var(--c-700); }

.expand__icon {
  position: relative;
  flex: 0 0 auto;
  width: 16px;
  height: 16px;
}
.expand__icon::before,
.expand__icon::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 2px;
  margin-top: -1px;
  background-color: var(--c-orange);
  transform-origin: center;
  transition: transform 0.24s var(--ease);
}
.expand__icon::after { transform: rotate(90deg); }
.expand[data-open] .expand__icon::after { transform: rotate(0deg); }

.expand__panel {
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  transition: max-height 0.24s var(--ease), opacity 0.24s var(--ease);
}
.expand[data-open] .expand__panel { opacity: 1; }

.expand__body {
  padding: 0 0 1.4rem;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--c-ink);
}

/* ---------- 11. 跳转链接 ---------- */
.skip-link {
  position: absolute;
  left: 16px;
  top: -80px;
  z-index: 200;
  padding: 0.7rem 1.15rem;
  font-weight: 700;
  text-decoration: none;
  color: var(--c-900);
  background-color: var(--c-orange);
  border-radius: 0 0 var(--radius) var(--radius);
  transition: top 0.18s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible { top: 0; outline: none; }

/* ---------- 12. 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  color: var(--c-white);
  background-color: rgba(6, 35, 63, 0.76);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  backdrop-filter: blur(16px) saturate(150%);
  border-bottom: 1px solid rgba(34, 224, 196, 0.22);
  transition: background-color var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease);
}

.site-header[data-scrolled] {
  background-color: var(--c-900);
  box-shadow: 0 1px 0 rgba(34, 224, 196, 0.35), 0 20px 40px -32px rgba(0, 0, 0, 0.95);
}

.site-header__rail {
  display: block;
  width: 100%;
  height: 3px;
  background-image: repeating-linear-gradient(90deg,
      rgba(34, 224, 196, 0.55) 0 1px,
      transparent 1px 12px);
  opacity: 0.55;
}

.header-inner {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.4vw, 34px);
  min-height: var(--header-h);
  padding-block: 0.5rem;
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  flex: 0 0 auto;
  text-decoration: none;
  color: var(--c-white);
}

.brand__mark {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 40px;
  height: 40px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--c-900);
  background-color: var(--c-orange);
  clip-path: polygon(0 0, 100% 0, 100% 72%, 86% 100%, 0 100%);
}

.brand__text { display: flex; flex-direction: column; line-height: 1.1; }
.brand__name { font-size: 1.0625rem; font-weight: 900; letter-spacing: 0.02em; }
.brand__sub {
  margin-top: 0.28rem;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(201, 251, 242, 0.72);
}

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

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(12px, 1.7vw, 26px);
}

.site-nav__item { position: relative; }

.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 0;
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  white-space: nowrap;
  text-decoration: none;
  color: rgba(255, 255, 255, 0.74);
  transition: color 0.18s var(--ease);
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background-color: var(--c-orange);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.2s var(--ease);
}

.site-nav__link:hover { color: var(--c-white); }
.site-nav__link:hover::after,
.site-nav__link[aria-current="page"]::after { transform: scaleX(1); }

.site-nav__link[aria-current="page"] {
  color: var(--c-white);
  font-weight: 600;
}

.site-nav__link[aria-current="page"]::before {
  content: "";
  flex: 0 0 auto;
  width: 5px;
  height: 5px;
  margin-right: 0.45rem;
  border-radius: 50%;
  background-color: var(--c-cyan);
  box-shadow: 0 0 8px rgba(34, 224, 196, 0.9);
}

.site-nav__foot { display: none; }

/* 右侧动作 */
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  flex: 0 0 auto;
}

/* 移动按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  min-height: 40px;
  padding: 0.45rem 0.7rem;
  color: var(--c-white);
  background-color: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(34, 224, 196, 0.35);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.nav-toggle:hover { background-color: rgba(34, 224, 196, 0.14); }

.nav-toggle__box {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 18px;
  height: 12px;
}
.nav-toggle__box span {
  display: block;
  height: 2px;
  background-color: currentColor;
  transition: transform 0.2s var(--ease), opacity 0.2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__box span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__box span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__box span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

.nav-toggle__text {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
}

/* 滚动进度刻度 */
.scroll-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background-image: linear-gradient(90deg, var(--c-orange), var(--c-cyan));
  transform: scaleX(0);
  transform-origin: left center;
  will-change: transform;
}

/* ---------- 13. 移动吸底快捷条 ---------- */
.quickbar { display: none; }

.quickbar__main {
  flex: 1 1 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.5rem 1rem;
  font-size: 0.9375rem;
  font-weight: 700;
  text-decoration: none;
  color: var(--c-900);
  background-color: var(--c-orange);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
}

.quickbar__alt {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.5rem 0.9rem;
  text-decoration: none;
  color: var(--c-cyan);
  border: 1px solid rgba(34, 224, 196, 0.45);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
}

/* ---------- 14. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 8vw, 110px);
  overflow: hidden;
  color: rgba(255, 255, 255, 0.72);
  background-color: var(--c-900);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 0 auto;
  width: min(520px, 46%);
  background-image: linear-gradient(200deg, rgba(14, 62, 107, 0.85), rgba(6, 35, 63, 0) 70%);
  clip-path: polygon(30% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.site-footer > .container { position: relative; z-index: 1; }

.footer-scale {
  height: 10px;
  background-image: repeating-linear-gradient(90deg,
      rgba(34, 224, 196, 0.55) 0 1px,
      transparent 1px 18px);
  border-bottom: 1px solid rgba(34, 224, 196, 0.16);
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.45fr);
  gap: clamp(28px, 5vw, 72px);
  padding-block: clamp(40px, 6vw, 72px);
}

.footer-eyebrow {
  margin-bottom: 1rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.footer-line {
  max-width: 20ch;
  font-size: clamp(1.25rem, 2.2vw, 1.625rem);
  font-weight: 900;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--c-white);
}

.footer-note {
  max-width: 34ch;
  margin-top: 0.85rem;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.6);
}

.footer-cta { margin-top: 1.4rem; }

.footer-contact {
  margin-top: 1.5rem;
  padding-top: 1.1rem;
  font-size: 0.8125rem;
  line-height: 1.95;
  color: rgba(255, 255, 255, 0.55);
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 40px);
}

.footer-col__title {
  margin-bottom: 1rem;
  padding-bottom: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-cyan);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.footer-col__list { display: flex; flex-direction: column; gap: 0.55rem; }

.footer-col__list a {
  display: inline-block;
  font-size: 0.9375rem;
  text-decoration: none;
  color: rgba(255, 255, 255, 0.72);
  transition: color 0.18s var(--ease), transform 0.18s var(--ease);
}
.footer-col__list a:hover {
  color: var(--c-orange-soft);
  transform: translateX(4px);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.7rem 1.5rem;
  padding-block: 1.25rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-legal,
.footer-mono {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: rgba(255, 255, 255, 0.5);
}

.footer-mono { color: rgba(34, 224, 196, 0.7); }

/* ---------- 15. 响应式 ---------- */
@media (max-width: 1024px) {
  .footer-top { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 960px) {
  :root { --header-h: 64px; }

  .brand__mark { width: 36px; height: 36px; font-size: 0.75rem; }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    margin-left: 0;
    max-height: calc(100dvh - var(--header-h));
    overflow-y: auto;
    padding: 0.9rem var(--gutter) 1.4rem;
    background-color: var(--c-900);
    border-top: 1px solid rgba(34, 224, 196, 0.22);
    border-bottom: 1px solid rgba(34, 224, 196, 0.22);
    box-shadow: 0 28px 44px -30px rgba(0, 0, 0, 0.95);
  }

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

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-nav__item + .site-nav__item { border-top: 1px solid rgba(255, 255, 255, 0.08); }

  .site-nav__link {
    display: flex;
    width: 100%;
    padding: 0.95rem 0;
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.82);
  }

  .site-nav__link::after { display: none; }

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

  .site-nav__link[aria-current="page"]::before {
    background-color: var(--c-orange);
    box-shadow: 0 0 8px rgba(255, 106, 19, 0.9);
  }

  .site-nav__foot { display: block; margin-top: 1.2rem; }

  .nav-toggle { display: inline-flex; }
  .header-cta { display: none; }
}

@media (max-width: 760px) {
  .quickbar {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 85;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.55rem max(12px, env(safe-area-inset-left))
             calc(0.55rem + env(safe-area-inset-bottom))
             max(12px, env(safe-area-inset-right));
    background-color: rgba(6, 35, 63, 0.96);
    -webkit-backdrop-filter: blur(14px);
    backdrop-filter: blur(14px);
    border-top: 1px solid rgba(34, 224, 196, 0.3);
  }

  body { padding-bottom: 68px; }
}

@media (max-width: 640px) {
  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .brand__sub { display: none; }
}

/* ---------- 16. 动效降级 ---------- */
@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;
  }
  .scroll-progress { transition: none !important; }
}