/* ==========================================================
   3499游戏攻略 · /assets/site.css
   共享层：重置 / 变量 / 中文排版 / 页头 / 页脚 / 基础组件
   ========================================================== */

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

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

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

body { margin: 0; }

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

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

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

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

a { color: inherit; }

table { border-collapse: collapse; }

/* ---------- 2. 变量 ---------- */
:root {
  --ink-900: #0B1626;
  --ink-850: #0D1A2C;
  --ink-800: #0E1B2E;
  --ink-700: #122237;
  --line: #24384F;
  --cyan: #3FD8E0;
  --cyan-soft: rgba(63, 216, 224, 0.09);
  --cyan-line: rgba(63, 216, 224, 0.42);
  --gold: #F2B441;
  --gold-soft: rgba(242, 180, 65, 0.09);
  --gold-line: rgba(242, 180, 65, 0.42);
  --orange: #FF7A45;
  --indigo: #5B4B9E;
  --wine: #6E2440;
  --white: #F5F9FC;
  --muted: #9FB4C7;

  --radius: 3px;
  --shell: 1200px;
  --gutter: clamp(18px, 4vw, 44px);
  --shadow-1: 0 1px 0 rgba(255, 255, 255, 0.03), 0 14px 30px -22px rgba(0, 0, 0, 0.95);
  --shadow-2: 0 20px 46px -30px rgba(0, 0, 0, 1);

  --font-display: "Bahnschrift", "DIN Alternate", "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", "SFMono-Regular", Consolas, "Courier New", monospace;
}

/* ---------- 3. 基础中文排版 ---------- */
body {
  min-height: 100vh;
  background:
    radial-gradient(1080px 520px at 90% -10%, rgba(63, 216, 224, 0.10), transparent 62%),
    radial-gradient(880px 460px at 2% 2%, rgba(91, 75, 158, 0.16), transparent 60%),
    var(--ink-900);
  color: var(--white);
  font-family: var(--font-body);
  font-size: 16.5px;
  line-height: 1.75;
  letter-spacing: 0.005em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.22;
  color: var(--white);
}

p { line-height: 1.78; }

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

::selection { background: rgba(63, 216, 224, 0.28); color: #FFFFFF; }

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

#main-content { display: block; scroll-margin-top: 96px; }
#main-content:focus { outline: none; }

/* ---------- 4. 骨架 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 300;
  padding: 12px 18px;
  background: var(--gold);
  color: #10203A;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  border-radius: var(--radius);
  transform: translateY(-180%);
  transition: transform 0.18s ease;
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 5. 页头 ---------- */
.site-header {
  position: relative;
  z-index: 90;
}

.header-top {
  background: linear-gradient(180deg, #0d1a2c 0%, var(--ink-900) 100%);
  border-bottom: 1px solid var(--line);
}

.header-top__inner {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.4vw, 34px);
  min-height: 84px;
  padding-block: 14px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 13px;
  text-decoration: none;
  color: inherit;
  flex: 0 0 auto;
}

.brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #07131F;
  background: linear-gradient(150deg, var(--cyan) 0%, #2AA8B6 100%);
  border-radius: 2px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 7px), calc(100% - 7px) 100%, 0 100%);
  box-shadow: 0 0 0 1px rgba(63, 216, 224, 0.35), 0 10px 22px -14px rgba(63, 216, 224, 0.95);
}

.brand__text { display: flex; flex-direction: column; gap: 2px; }

.brand__name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--white);
  line-height: 1.2;
}

.brand__line {
  font-size: 12.5px;
  line-height: 1.4;
  letter-spacing: 0.02em;
  color: var(--muted);
}

.quick-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-left: auto;
}

.quick-action {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px 7px 9px;
  font-size: 13px;
  line-height: 1.4;
  color: var(--muted);
  text-decoration: none;
  background: rgba(18, 34, 55, 0.6);
  border: 1px solid var(--line);
  border-radius: 2px;
  transition: color 0.16s ease, border-color 0.16s ease, background 0.16s ease, transform 0.16s ease;
}

.quick-action__idx {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.quick-action:hover,
.quick-action:focus-visible {
  color: var(--white);
  border-color: var(--cyan-line);
  background: var(--cyan-soft);
  transform: translateY(-1px);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 13px;
  color: var(--white);
  background: var(--cyan-soft);
  border: 1px solid var(--cyan-line);
  border-radius: 2px;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
}

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 14px;
  flex: 0 0 auto;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: currentColor;
  transition: transform 0.2s ease, top 0.2s ease;
}

.nav-toggle__bars::before { top: 3px; }
.nav-toggle__bars::after { top: 9px; }

.site-header[data-nav-open="true"] .nav-toggle__bars::before { top: 6px; transform: rotate(45deg); }
.site-header[data-nav-open="true"] .nav-toggle__bars::after { top: 6px; transform: rotate(-45deg); }

.header-bar {
  position: sticky;
  top: 0;
  z-index: 95;
  background: rgba(11, 22, 38, 0.94);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.header-bar.is-stuck {
  border-bottom-color: var(--cyan-line);
  box-shadow: 0 18px 34px -26px #000;
}

.header-bar__inner {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 58px;
}

.header-bar__progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  transform: scaleX(var(--progress, 0));
  transform-origin: left center;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--gold) 100%);
  opacity: 0.9;
  pointer-events: none;
}

.site-nav { margin-right: auto; }

.site-nav__list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 2px;
  counter-reset: navitem;
}

.site-nav__list > li { counter-increment: navitem; }

.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 17px 14px;
  font-size: 14.5px;
  line-height: 1.3;
  letter-spacing: 0.01em;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 0.16s ease, border-color 0.16s ease, background 0.16s ease;
}

.site-nav__link::before {
  content: counter(navitem, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--gold);
  opacity: 0.5;
  transition: opacity 0.16s ease;
}

.site-nav__link:hover {
  color: var(--white);
  background: var(--cyan-soft);
}

.site-nav__link:hover::before { opacity: 1; }

.site-nav__link[aria-current="page"] {
  color: var(--white);
  border-bottom-color: var(--cyan);
  background: linear-gradient(180deg, transparent, rgba(63, 216, 224, 0.07));
}

.site-nav__link[aria-current="page"]::before { opacity: 1; }

.nav-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
  white-space: nowrap;
}

.nav-status__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(63, 216, 224, 0.14);
  animation: statusPulse 2.6s ease-in-out infinite;
}

@keyframes statusPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.42; }
}

/* ---------- 6. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(60px, 9vw, 116px);
  background: #08111D;
  border-top: 1px solid var(--line);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan), var(--gold), transparent);
  opacity: 0.34;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(200px, 1fr) 2.2fr;
  gap: clamp(30px, 5vw, 72px);
  padding-block: clamp(40px, 6vw, 72px);
}

.footer-brand { display: flex; flex-direction: column; gap: 16px; }

.footer-brand__motto {
  max-width: 22em;
  font-size: 13.5px;
  color: var(--muted);
  border-left: 2px solid var(--gold-line);
  padding-left: 12px;
}

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

.footer-col__title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--gold);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 14px;
}

.footer-col__list { display: flex; flex-direction: column; gap: 9px; }

.footer-col__link {
  display: inline-block;
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.16s ease, border-color 0.16s ease, transform 0.16s ease;
}

.footer-col__link:hover,
.footer-col__link:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan-line);
  transform: translateX(2px);
}

.footer-meta {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(18, 34, 55, 0.36);
}

.footer-meta__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px 40px;
  padding-block: 22px;
}

.footer-contact {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  flex: 1 1 420px;
}

.footer-contact__item {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-size: 13.5px;
}

.footer-contact__key {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--gold);
  padding: 2px 6px;
  border: 1px solid var(--gold-line);
  border-radius: 2px;
  white-space: nowrap;
}

.footer-contact__val { color: var(--muted); }

.footer-note {
  flex: 1 1 260px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
  padding-left: 12px;
  border-left: 2px solid var(--line);
}

.footer-legal__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 28px;
  padding-block: 20px 28px;
  font-size: 12.5px;
  color: var(--muted);
}

.footer-legal__links { display: flex; flex-wrap: wrap; gap: 18px; }

.footer-legal__link {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.16s ease, border-color 0.16s ease;
}

.footer-legal__link:hover,
.footer-legal__link:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan-line);
}

.footer-icp {
  margin-left: auto;
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- 7. 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 22px;
  font-family: var(--font-body);
  font-size: 14.5px;
  font-weight: 600;
  line-height: 1.4;
  text-decoration: none;
  color: var(--white);
  background: rgba(18, 34, 55, 0.72);
  border: 1px solid var(--line);
  border-radius: 2px;
  cursor: pointer;
  transition: transform 0.16s ease, border-color 0.16s ease, background 0.16s ease, color 0.16s ease, box-shadow 0.16s ease;
}

.btn:hover,
.btn:focus-visible { transform: translateY(-1px); }

.btn--primary {
  color: #07131F;
  background: linear-gradient(135deg, var(--cyan) 0%, #2CB9C6 100%);
  border-color: transparent;
  box-shadow: 0 12px 26px -18px rgba(63, 216, 224, 0.95);
}

.btn--primary:hover,
.btn--primary:focus-visible { box-shadow: 0 16px 30px -16px rgba(63, 216, 224, 0.9); }

.btn--gold {
  color: #1B1405;
  background: linear-gradient(135deg, var(--gold) 0%, #D99A22 100%);
  border-color: transparent;
  box-shadow: 0 12px 26px -18px rgba(242, 180, 65, 0.9);
}

.btn--ghost {
  background: transparent;
  color: var(--muted);
  border-color: var(--line);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan-line);
  background: var(--cyan-soft);
}

.btn__arrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

/* ---------- 8. 基础组件 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--cyan);
  opacity: 0.65;
}

.breadcrumb { font-size: 12.5px; color: var(--muted); }

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.breadcrumb__list > li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
  font-family: var(--font-mono);
}

.breadcrumb__list a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.16s ease;
}

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

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

.page-head {
  display: grid;
  gap: 14px;
  padding-block: clamp(26px, 4vw, 50px) clamp(20px, 3vw, 34px);
  border-bottom: 1px solid var(--line);
}

.page-head__kicker {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-head__title {
  font-size: clamp(30px, 4.6vw, 54px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.page-head__lede {
  max-width: 34em;
  color: var(--muted);
  font-size: 15.5px;
}

.section { padding-block: clamp(36px, 5.5vw, 72px); }

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px 16px;
  margin-bottom: clamp(20px, 3vw, 34px);
}

.section__no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gold);
  background: var(--gold-soft);
  border: 1px solid var(--gold-line);
  border-radius: 2px;
}

.section__title {
  font-size: clamp(21px, 2.8vw, 30px);
  font-weight: 800;
  letter-spacing: -0.015em;
}

.section__lede {
  flex: 1 1 280px;
  font-size: 14px;
  color: var(--muted);
}

.grid {
  display: grid;
  gap: clamp(16px, 2.2vw, 26px);
}

.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)); }
.grid--auto { grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr)); }

.stack > * + * { margin-top: clamp(14px, 1.8vw, 22px); }

.card {
  position: relative;
  padding: clamp(18px, 2.4vw, 26px);
  background: linear-gradient(180deg, rgba(18, 34, 55, 0.92) 0%, rgba(14, 27, 46, 0.88) 100%);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
}

.card--cut {
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
  border-radius: 0;
  box-shadow: var(--shadow-2);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  background: var(--cyan-soft);
  border: 1px solid var(--cyan-line);
  border-radius: 2px;
}

.tag--gold {
  color: var(--gold);
  background: var(--gold-soft);
  border-color: var(--gold-line);
}

.tag--indigo {
  color: #D8CFF9;
  background: rgba(91, 75, 158, 0.32);
  border-color: rgba(91, 75, 158, 0.95);
}

.tag--wine {
  color: #F2CBD8;
  background: rgba(110, 36, 64, 0.42);
  border-color: rgba(150, 58, 90, 0.95);
}

.divider-note {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 16px 18px;
  font-size: 14px;
  color: #FFD9C9;
  background: rgba(255, 122, 69, 0.07);
  border: 1px solid var(--line);
  border-left: 3px solid var(--orange);
  border-radius: 2px;
}

.mono-line {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--white);
  background: rgba(18, 34, 55, 0.78);
  border: 1px solid var(--line);
  border-left: 2px solid var(--gold);
  border-radius: 2px;
}

.mono-line::before {
  content: "\203A";
  color: var(--gold);
  font-weight: 700;
}

.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background:
    radial-gradient(120% 120% at 18% 0%, rgba(63, 216, 224, 0.16), transparent 62%),
    linear-gradient(160deg, rgba(18, 34, 55, 0.95), rgba(11, 22, 38, 0.98));
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

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

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 24px 14px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--muted);
  background: linear-gradient(0deg, rgba(8, 17, 29, 0.94), transparent);
}

.prose {
  max-width: 38em;
  font-size: 16.5px;
}

.prose > * + * { margin-top: 1.1em; }

.prose h2,
.prose h3 { font-family: var(--font-display); line-height: 1.3; }

.prose h2 {
  font-size: clamp(21px, 2.4vw, 27px);
  margin-top: 1.8em;
}

.prose h3 {
  font-size: 18px;
  margin-top: 1.6em;
}

.prose a {
  color: var(--cyan);
  text-decoration: underline;
  text-decoration-color: rgba(63, 216, 224, 0.42);
  text-underline-offset: 3px;
}

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

.prose ol { list-style: decimal; }

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

.prose blockquote {
  padding-left: 16px;
  color: var(--muted);
  border-left: 2px solid var(--gold);
}

/* ---------- 9. 动效与状态 ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.35s ease, transform 0.35s ease;
}

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

[data-scrollspy] a.is-active,
[data-scrollspy] a[aria-current="true"] {
  color: var(--cyan);
  border-color: var(--cyan-line);
}

.to-top {
  position: fixed;
  right: clamp(14px, 3vw, 28px);
  bottom: clamp(14px, 3vw, 28px);
  z-index: 130;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1;
  color: var(--cyan);
  background: rgba(13, 26, 44, 0.94);
  border: 1px solid var(--cyan-line);
  border-radius: 2px;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  box-shadow: 0 18px 32px -24px #000;
  transition: opacity 0.2s ease, transform 0.2s ease, background 0.2s ease;
}

.to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: none;
}

.to-top:hover,
.to-top:focus-visible { background: rgba(63, 216, 224, 0.16); }

/* ---------- 10. 响应式 ---------- */
@media (max-width: 1080px) {
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 980px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-top { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 900px) {
  .header-top__inner { flex-wrap: wrap; row-gap: 12px; }

  .quick-actions {
    order: 3;
    width: 100%;
    margin-left: 0;
  }

  .nav-toggle { display: inline-flex; margin-left: auto; }

  .nav-status { display: none; }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    max-height: min(72vh, 520px);
    overflow-y: auto;
    background: #0C1A2B;
    border-bottom: 1px solid var(--line);
    box-shadow: 0 26px 52px -30px #000;
  }

  .site-header[data-nav-open="true"] .site-nav { display: block; }

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

  .site-nav__list > li + li { border-top: 1px solid var(--line); }

  .site-nav__link {
    width: 100%;
    padding: 15px 22px;
    font-size: 15px;
    border-bottom: 0;
    border-left: 2px solid transparent;
  }

  .site-nav__link[aria-current="page"] {
    border-left-color: var(--cyan);
    border-bottom-color: transparent;
    background: var(--cyan-soft);
  }
}

@media (max-width: 760px) {
  .footer-nav { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .footer-note { flex-basis: 100%; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }

  .header-top__inner { min-height: 72px; }

  .brand__line { display: none; }

  .quick-actions {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 4px;
    scrollbar-width: thin;
  }

  .quick-action { white-space: nowrap; }

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

  .footer-nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    row-gap: 26px;
  }

  .footer-contact { flex-direction: column; gap: 10px; }

  .footer-legal__inner { flex-direction: column; align-items: flex-start; }

  .footer-icp { margin-left: 0; }
}

@media (max-width: 560px) {
  .grid--3,
  .grid--4 { grid-template-columns: minmax(0, 1fr); }

  .section__lede { flex-basis: 100%; }
}

/* ---------- 11. 降低动效 ---------- */
@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;
  }

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

  .nav-status__dot { animation: none !important; }
}