/* ============================================================
   爱游戏娱乐赛 · 共享样式表 /assets/site.css
   深墨绿蓝图底 · 荧光青信号 · 亮橙行动 · 切角与斜线
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,
*::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, li, figure, figcaption, blockquote, dl, dd {
  margin: 0;
}

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

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

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

a { color: inherit; text-decoration: none; }

main { display: block; }

[id] { scroll-margin-top: 96px; }

/* ---------- 2. Tokens ---------- */
:root {
  --ink-900: #0B1F1A;
  --ink-800: #12332B;
  --ink-700: #1E4A3F;
  --cyan: #39F2D0;
  --orange: #FF7A2F;
  --paper: #F4EFE6;
  --mist: #B8D8D0;
  --yellow: #F5C542;
  --rust: #8A3B12;
  --alert: #FF5A5F;
  --glass: rgba(244, 239, 230, 0.08);

  --shell: 1240px;
  --gutter: clamp(16px, 4vw, 48px);
  --cut: 18px;

  --font-display: "Barlow Condensed", "HarmonyOS Sans SC", "Source Han Sans SC",
    "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Source Han Sans SC", "Noto Sans SC", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "Sarasa Mono SC", "JetBrains Mono", ui-monospace,
    SFMono-Regular, Menlo, Consolas, monospace;

  --ease: cubic-bezier(.22, .61, .36, 1);
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--ink-900);
  background-image:
    linear-gradient(to right, rgba(30, 74, 63, 0.42) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(30, 74, 63, 0.28) 1px, transparent 1px);
  background-size: 96px 96px, 96px 96px;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  letter-spacing: 0.01em;
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--paper);
  text-wrap: balance;
}

p { text-wrap: pretty; }

strong { color: var(--paper); }

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

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

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

.shell--narrow { max-width: 880px; }

.section { padding-block: clamp(40px, 6vw, 88px); }

/* ---------- 5. 通用元素 ---------- */
.skip-link {
  position: absolute;
  top: -80px;
  left: var(--gutter);
  z-index: 200;
  padding: 10px 18px;
  background: var(--cyan);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: top .2s var(--ease);
}
.skip-link:focus { top: 10px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 24px;
  border: 1px solid var(--ink-700);
  background: transparent;
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  cursor: pointer;
  clip-path: polygon(12px 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%, 0 12px);
  transition: background-color .18s var(--ease), color .18s var(--ease),
    border-color .18s var(--ease), transform .18s var(--ease);
}
.btn:hover { transform: translateY(-2px); }
.btn:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 2px var(--cyan), 0 0 0 3px rgba(57, 242, 208, 0.3);
}

.btn--primary {
  background: var(--orange);
  border-color: var(--orange);
  color: #10201B;
  font-weight: 700;
}
.btn--primary:hover { background: #FF9556; border-color: #FF9556; }

.btn--ghost {
  border-color: var(--cyan);
  color: var(--cyan);
}
.btn--ghost:hover { background: rgba(57, 242, 208, 0.12); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--cyan);
}
.eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--cyan);
}

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

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--ink-700);
  background: var(--glass);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  line-height: 1.6;
}
.tag--live { color: var(--cyan); border-color: rgba(57, 242, 208, 0.55); }
.tag--alert { color: var(--orange); border-color: rgba(255, 122, 47, 0.6); }

.panel {
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  background: var(--ink-800);
  border: 1px solid var(--ink-700);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%,
    var(--cut) 100%, 0 calc(100% - var(--cut)));
  transition: transform .2s var(--ease), border-color .2s var(--ease),
    background-color .2s var(--ease);
}
.panel:hover {
  transform: translateY(-3px);
  border-color: var(--cyan);
  background: #143A31;
}

.panel-title {
  font-family: var(--font-display);
  font-size: clamp(18px, 2vw, 24px);
  line-height: 1.2;
  margin-bottom: 10px;
  color: var(--paper);
}

.stat { display: flex; flex-direction: column; gap: 2px; }
.stat__num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(34px, 5vw, 58px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}
.stat__label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mist);
}

/* 图片容器基础规则：页面阶段只放 <img class="media__img"> */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background: var(--ink-800);
  border: 1px solid var(--ink-700);
}
.media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.72) contrast(1.06);
  transition: transform .4s var(--ease), filter .4s var(--ease);
}
.media:hover .media__img { transform: scale(1.03); filter: saturate(0.9) contrast(1.08); }
.media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(118deg, rgba(11, 31, 26, 0.62) 0%, rgba(57, 242, 208, 0.14) 52%, transparent 78%),
    linear-gradient(to top, rgba(11, 31, 26, 0.72) 0%, transparent 42%);
}
.media__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--paper);
  background: rgba(11, 31, 26, 0.7);
  border-left: 2px solid var(--orange);
}
.media--wide { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 4 / 5; }

.crumb { padding-block: clamp(14px, 2vw, 22px); }
.crumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist);
}
.crumb__item { display: inline-flex; align-items: center; gap: 8px; }
.crumb__item::after { content: "/"; color: var(--ink-700); }
.crumb__item:last-child::after { content: ""; }
.crumb__link { color: var(--mist); transition: color .18s var(--ease); }
.crumb__link:hover { color: var(--cyan); }
.crumb__current { color: var(--paper); }

.prose {
  max-width: 68ch;
  color: rgba(244, 239, 230, 0.86);
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.85;
}
.prose > * + * { margin-top: 1.05em; }
.prose h2, .prose h3 {
  color: var(--paper);
  line-height: 1.25;
  margin-top: 1.9em;
}
.prose h2 { font-size: clamp(22px, 2.6vw, 30px); }
.prose h3 { font-size: clamp(18px, 2vw, 22px); }
.prose a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}
.prose a:hover { color: var(--orange); }
.prose ul, .prose ol {
  display: flex;
  flex-direction: column;
  gap: 0.5em;
  padding-left: 1.3em;
}
.prose ul li { position: relative; list-style: none; }
.prose ul li::before {
  content: "";
  position: absolute;
  left: -1.3em;
  top: 0.85em;
  width: 9px;
  height: 1px;
  background: var(--cyan);
}
.prose ol { list-style: decimal; }
.prose ol li { list-style: decimal; }
.prose blockquote {
  margin: 1.6em 0;
  padding: 14px 20px;
  border-left: 2px solid var(--orange);
  background: var(--glass);
  color: var(--paper);
}
.prose code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: 1px 6px;
  background: var(--glass);
  border: 1px solid var(--ink-700);
}
.prose hr {
  border: 0;
  height: 1px;
  background: repeating-linear-gradient(115deg, var(--ink-700) 0 12px, transparent 12px 24px);
  margin-block: 2em;
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 14px;
  margin-bottom: clamp(20px, 3vw, 34px);
  border-bottom: 1px solid var(--ink-700);
}
.section-title {
  font-size: clamp(28px, 3.6vw, 46px);
  line-height: 1.04;
}
.section-note {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist);
}

.grid { display: grid; gap: clamp(16px, 2.4vw, 28px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--aside { grid-template-columns: minmax(0, 2.2fr) minmax(0, 1fr); }

.slash-divider {
  height: 1px;
  border: 0;
  margin-block: clamp(28px, 4vw, 56px);
  background: repeating-linear-gradient(115deg, var(--ink-700) 0 14px, transparent 14px 28px);
}

.vertical-note {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.42em;
  text-transform: uppercase;
  color: rgba(184, 216, 208, 0.7);
}

.section-marker {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-left: 2px solid var(--ink-700);
  background: transparent;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist);
  transition: color .18s var(--ease), border-color .18s var(--ease),
    background-color .18s var(--ease);
}
.section-marker:hover { color: var(--paper); border-left-color: var(--orange); }
.section-marker.is-active {
  background: var(--cyan);
  border-left-color: var(--cyan);
  color: var(--ink-900);
}

/* 顶部阅读进度 */
.read-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 150;
  background: rgba(30, 74, 63, 0.55);
  pointer-events: none;
}
.read-progress__bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
  transition: width .12s linear;
}

/* ---------- 6. 页头 ---------- */
.site-header {
  position: relative;
  z-index: 80;
  background: var(--ink-900);
  border-bottom: 1px solid var(--ink-700);
  isolation: isolate;
}
.site-header::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -1px;
  width: clamp(80px, 18vw, 220px);
  height: 3px;
  background: var(--orange);
}

.header-upper__inner {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.4vw, 32px);
  min-height: 72px;
  padding-block: 14px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: none;
  color: var(--paper);
}
.brand__mark {
  position: relative;
  display: block;
  width: 26px;
  height: 26px;
  flex: none;
  border: 1.5px solid var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% 68%, 68% 100%, 0 100%);
}
.brand__mark-line {
  position: absolute;
  right: 6px;
  top: 7px;
  width: 11px;
  height: 1.5px;
  background: var(--cyan);
  transform: rotate(-45deg);
  transform-origin: right center;
}
.brand__mark-dot {
  position: absolute;
  left: 5px;
  bottom: 5px;
  width: 4px;
  height: 4px;
  background: var(--orange);
}
.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}
.brand__name {
  font-family: var(--font-display);
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 700;
  letter-spacing: 0.03em;
}
.brand__sub {
  margin-top: 3px;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.26em;
  color: var(--mist);
  white-space: nowrap;
}
.brand--footer .brand__name { font-size: clamp(19px, 2.2vw, 23px); }

.header-upper__line {
  flex: 1 1 auto;
  min-width: 0;
  padding-left: clamp(14px, 2vw, 28px);
  border-left: 1px solid var(--ink-700);
  font-size: 13px;
  color: var(--mist);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-upper__meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: auto;
}

.header-quick {
  display: flex;
  flex-direction: column;
  gap: 1px;
  padding: 5px 12px;
  border-left: 2px solid var(--orange);
  line-height: 1.25;
  transition: background-color .18s var(--ease);
}
.header-quick:hover { background: rgba(255, 122, 47, 0.1); }
.header-quick__label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.2em;
  color: var(--orange);
}
.header-quick__hint {
  font-size: 13px;
  color: var(--mist);
}

.header-call {
  padding: 9px 16px;
  border: 1px solid var(--cyan);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  white-space: nowrap;
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px),
    calc(100% - 10px) 100%, 0 100%, 0 10px);
  transition: background-color .18s var(--ease), color .18s var(--ease);
}
.header-call:hover { background: var(--cyan); color: var(--ink-900); }
.header-call:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 2px var(--cyan), 0 0 0 3px rgba(57, 242, 208, 0.3);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 14px;
  background: transparent;
  border: 1px solid var(--ink-700);
  color: var(--paper);
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  transition: border-color .18s var(--ease), color .18s var(--ease);
}
.nav-toggle:hover { border-color: var(--cyan); color: var(--cyan); }
.nav-toggle__bars {
  display: flex;
  flex-direction: column;
  gap: 3px;
  width: 16px;
}
.nav-toggle__bars span {
  display: block;
  height: 1.5px;
  background: currentColor;
  transition: transform .2s var(--ease), opacity .2s var(--ease);
}
.site-header[data-open="true"] .nav-toggle__bars span:nth-child(1) { transform: translateY(4.5px) rotate(45deg); }
.site-header[data-open="true"] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.site-header[data-open="true"] .nav-toggle__bars span:nth-child(3) { transform: translateY(-4.5px) rotate(-45deg); }

.header-lower {
  background: var(--ink-800);
  border-top: 1px solid var(--ink-700);
  border-bottom: 1px solid var(--ink-700);
}
.header-lower__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.primary-nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 2px;
}
.primary-nav__item { display: flex; }
.primary-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 15px clamp(10px, 1.6vw, 20px);
  border-bottom: 2px solid transparent;
  font-size: 14px;
  letter-spacing: 0.03em;
  color: var(--mist);
  transition: color .18s var(--ease), border-color .18s var(--ease),
    background-color .18s var(--ease);
}
.primary-nav__item:first-child .primary-nav__link { padding-left: 0; }
.primary-nav__link:hover {
  color: var(--paper);
  background: rgba(57, 242, 208, 0.07);
}
.primary-nav__link[aria-current="page"] {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}
.primary-nav__num {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.1em;
  color: rgba(184, 216, 208, 0.5);
}
.primary-nav__link[aria-current="page"] .primary-nav__num { color: var(--cyan); }

.header-lower__index {
  padding-left: 16px;
  border-left: 1px solid var(--ink-700);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(184, 216, 208, 0.55);
  white-space: nowrap;
}

@keyframes navIn {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: none; }
}

/* ---------- 7. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 7vw, 96px);
  padding-block: clamp(36px, 5vw, 64px) 0;
  background:
    linear-gradient(180deg, rgba(18, 51, 43, 0.9) 0%, rgba(11, 31, 26, 1) 62%);
  border-top: 1px solid var(--ink-700);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 4px;
  background: repeating-linear-gradient(115deg, var(--cyan) 0 12px, transparent 12px 30px);
  opacity: 0.35;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(220px, 1.1fr) minmax(0, 1.6fr) minmax(230px, 1fr);
  gap: clamp(24px, 4vw, 56px);
  align-items: start;
}

.footer-brand { display: flex; flex-direction: column; }
.footer-tagline {
  margin-top: 18px;
  font-family: var(--font-display);
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--paper);
  max-width: 16ch;
}
.footer-note {
  margin-top: 10px;
  max-width: 34ch;
  font-size: 13px;
  line-height: 1.75;
  color: var(--mist);
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(16px, 3vw, 32px);
}
.footer-col__title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 10.5px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--cyan);
}
.footer-col__list {
  display: flex;
  flex-direction: column;
  gap: 9px;
}
.footer-col__link {
  position: relative;
  display: inline-block;
  font-size: 14px;
  color: var(--mist);
  transition: color .18s var(--ease), padding-left .18s var(--ease);
}
.footer-col__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 0;
  height: 1px;
  background: var(--orange);
  transition: width .18s var(--ease);
}
.footer-col__link:hover { color: var(--paper); padding-left: 14px; }
.footer-col__link:hover::before { width: 9px; }

.footer-contact {
  padding: clamp(16px, 2vw, 22px);
  background: var(--ink-800);
  border: 1px solid var(--ink-700);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
}
.footer-contact__title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 10.5px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--cyan);
}
.footer-contact__list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.footer-contact__item { display: flex; flex-direction: column; gap: 2px; }
.footer-contact__label {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(184, 216, 208, 0.6);
}
.footer-contact__value {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--paper);
  overflow-wrap: anywhere;
}

.copy-chip {
  padding: 2px 7px;
  background: transparent;
  border: 1px solid var(--ink-700);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.12em;
  cursor: pointer;
  transition: color .18s var(--ease), border-color .18s var(--ease),
    background-color .18s var(--ease);
}
.copy-chip:hover { color: var(--cyan); border-color: var(--cyan); }
.copy-chip.is-done {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink-900);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  margin-top: clamp(28px, 4vw, 48px);
  padding-block: 18px;
  border-top: 1px solid var(--ink-700);
}
.footer-legal__copy,
.footer-legal__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: rgba(184, 216, 208, 0.65);
}

/* ---------- 8. 响应式 ---------- */
@media (max-width: 1080px) {
  .grid--aside { grid-template-columns: minmax(0, 1fr); }
  .footer-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr); }
  .footer-contact { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  .header-upper__line { display: none; }
  .header-call { display: none; }
  .nav-toggle { display: inline-flex; }
  .header-upper__inner { flex-wrap: wrap; }
  .header-lower__inner {
    flex-direction: column;
    align-items: stretch;
    padding-block: 0;
  }
  .primary-nav { display: none; width: 100%; }
  .site-header[data-open="true"] .primary-nav {
    display: block;
    animation: navIn .22s var(--ease) both;
  }
  .primary-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-block: 4px 10px;
  }
  .primary-nav__link {
    width: 100%;
    padding: 14px 0;
    border-bottom: 1px solid var(--ink-700);
  }
  .primary-nav__item:first-child .primary-nav__link { padding-left: 0; }
  .primary-nav__link[aria-current="page"] { background: rgba(57, 242, 208, 0.08); }
  .header-lower__index { display: none; }
  .grid--2, .grid--3 { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 720px) {
  .footer-grid { grid-template-columns: minmax(0, 1fr); gap: 30px; }
  .footer-contact { grid-column: auto; }
  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-legal { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 620px) {
  .header-upper__inner { min-height: 64px; gap: 10px; }
  .header-quick__hint { display: none; }
  .brand__sub { display: none; }
  .footer-nav { grid-template-columns: minmax(0, 1fr); }
  .brand__mark { width: 22px; height: 22px; }
}

/* ---------- 9. 无障碍与动效偏好 ---------- */
@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;
  }
  .panel:hover,
  .btn:hover,
  .media:hover .media__img { transform: none; }
}