/* ==========================================================================
   非凡游艺 Playhub — 共享样式表 /assets/site.css
   暗底霓虹 · 粗野主义骨架 · 数据叙事节奏
   ========================================================================== */

:root {
  --deep-night: #06182E;
  --deep-ink: #020812;
  --deep-card: #0B2447;
  --neon-cyan: #2DE2E6;
  --neon-coral: #FF6B5A;
  --neon-violet: #A78BFA;
  --neon-green: #6EF3A5;
  --neon-amber: #FFD166;
  --mist: #8FA3B8;
  --sand: #F4F7FB;

  --hairline: rgba(143, 163, 184, 0.26);
  --hairline-strong: rgba(143, 163, 184, 0.5);
  --glow-cyan: rgba(45, 226, 230, 0.22);
  --shadow-hard: 6px 6px 0 rgba(2, 8, 18, 0.9);

  --font-display: "Noto Sans SC", "Archivo Black", "Inter", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "Inter", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;

  --shell-max: 1320px;
  --pad-x: clamp(16px, 3.4vw, 40px);
  --step-0: clamp(1rem, 1.05vw, 1.125rem);
  --step-1: clamp(1.3rem, 1.9vw, 1.6rem);
  --step-2: clamp(1.8rem, 3vw, 3rem);
  --step-3: clamp(2.6rem, 6vw, 5rem);
  --ease-out: cubic-bezier(0.22, 0.7, 0.28, 1);
}

/* ---------- reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 140px;
}

body {
  margin: 0;
  background: var(--deep-night);
  color: var(--sand);
  font-family: var(--font-body);
  font-size: var(--step-0);
  font-weight: 400;
  line-height: 1.85;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

p { margin: 0; }
img { display: block; max-width: 100%; height: auto; }

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

a { color: var(--neon-cyan); text-decoration-thickness: 1px; text-underline-offset: 3px; }

button { font: inherit; }

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

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

/* ---------- 滚动条 ---------- */
* { scrollbar-color: rgba(45, 226, 230, 0.4) transparent; scrollbar-width: thin; }

/* ==========================================================================
   1. 头部
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: linear-gradient(180deg, #020812 0%, #06182E 100%);
  border-bottom: 2px solid rgba(45, 226, 230, 0.22);
  color: var(--sand);
}

.site-header::before {
  content: "";
  display: block;
  height: 3px;
  background: linear-gradient(90deg, var(--neon-cyan), var(--neon-violet) 55%, var(--neon-coral));
}

.site-header.is-stuck {
  box-shadow: 0 18px 34px -22px rgba(2, 8, 18, 0.98);
}

/* 跳转链接 */
.skip-link {
  position: absolute;
  left: 12px;
  top: -72px;
  z-index: 99;
  padding: 10px 16px;
  background: var(--neon-cyan);
  color: var(--deep-ink);
  font-weight: 800;
  font-size: 0.875rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  border: 2px solid var(--deep-ink);
  transition: top 0.18s var(--ease-out);
}

.skip-link:focus {
  top: 10px;
}

/* 命令栏 */
.command-bar {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: clamp(12px, 2vw, 32px);
  width: 100%;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 11px var(--pad-x);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.brand__dot {
  flex: none;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--neon-cyan);
  box-shadow: 0 0 0 3px rgba(45, 226, 230, 0.16), 0 0 12px rgba(45, 226, 230, 0.6);
  animation: brand-pulse 2.8s ease-in-out infinite;
}

@keyframes brand-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.78); }
}

.brand__link {
  display: flex;
  flex-direction: column;
  line-height: 1;
  text-decoration: none;
  color: var(--sand);
  min-width: 0;
}

.brand__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.125rem;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.brand__sub {
  margin-top: 6px;
  font-size: 0.625rem;
  font-weight: 600;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--mist);
}

/* 主导航 */
.primary-nav {
  min-width: 0;
}

.primary-nav__list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2px;
  flex-wrap: nowrap;
  counter-reset: navidx;
}

.primary-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 2px;
  padding: 8px 12px;
  border: 2px solid transparent;
  border-radius: 2px;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.18s var(--ease-out), background 0.18s var(--ease-out),
    border-color 0.18s var(--ease-out), box-shadow 0.18s var(--ease-out);
}

.primary-nav__link::before {
  counter-increment: navidx;
  content: counter(navidx, decimal-leading-zero);
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  font-variant-numeric: tabular-nums;
  color: var(--hairline-strong);
  transition: color 0.18s var(--ease-out);
}

.primary-nav__link:hover {
  color: var(--sand);
  border-color: var(--deep-card);
  background: rgba(11, 36, 71, 0.7);
}

.primary-nav__link:hover::before { color: var(--neon-cyan); }

.primary-nav__link[aria-current="page"] {
  background: var(--neon-cyan);
  border-color: var(--neon-cyan);
  color: var(--deep-ink);
  box-shadow: 3px 3px 0 rgba(2, 8, 18, 0.9);
}

.primary-nav__link[aria-current="page"]::before {
  color: rgba(2, 8, 18, 0.62);
}

/* 右侧动作区 */
.command-bar__actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 9px 13px;
  background: var(--deep-card);
  color: var(--sand);
  border: 2px solid var(--hairline-strong);
  border-radius: 2px;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: color 0.18s var(--ease-out), border-color 0.18s var(--ease-out);
}

.nav-toggle:hover {
  color: var(--neon-cyan);
  border-color: var(--neon-cyan);
}

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  background: currentColor;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: transform 0.18s var(--ease-out);
}

.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { transform: translateY(-5px) rotate(-45deg); }

/* 状态轨 */
.status-rail {
  background: var(--deep-ink);
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}

.status-rail__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 0;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 6px var(--pad-x);
}

.status-rail__item {
  display: flex;
  align-items: center;
  gap: 7px;
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.status-rail__item + .status-rail__item {
  margin-left: 18px;
  padding-left: 18px;
  border-left: 1px solid var(--hairline);
}

.status-rail__key {
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(143, 163, 184, 0.75);
}

.status-rail__value {
  color: var(--sand);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.status-rail__led {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--neon-green);
  box-shadow: 0 0 9px rgba(110, 243, 165, 0.85);
}

/* 分类带 */
.cat-strip {
  background: var(--deep-night);
  border-bottom: 1px solid var(--hairline);
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x proximity;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.cat-strip::-webkit-scrollbar { display: none; }

.cat-strip__list {
  display: flex;
  align-items: center;
  gap: 8px;
  width: max-content;
  min-width: 100%;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 10px var(--pad-x);
}

.cat-strip__item {
  --cat-color: var(--neon-cyan);
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 8px 14px 8px 12px;
  background: var(--deep-card);
  border: 2px solid var(--deep-card);
  border-left: 4px solid var(--cat-color);
  border-radius: 2px;
  color: var(--sand);
  text-decoration: none;
  white-space: nowrap;
  scroll-snap-align: start;
  transition: transform 0.18s var(--ease-out), border-color 0.18s var(--ease-out),
    box-shadow 0.18s var(--ease-out);
}

.cat-strip__item:hover,
.cat-strip__item:focus-visible {
  transform: translateY(-2px);
  border-color: var(--cat-color);
  box-shadow: 0 6px 0 -2px rgba(2, 8, 18, 0.95);
}

.cat-strip__item--strategy { --cat-color: var(--neon-coral); }
.cat-strip__item--puzzle { --cat-color: var(--neon-cyan); }
.cat-strip__item--action { --cat-color: var(--neon-violet); }
.cat-strip__item--sim { --cat-color: var(--neon-green); }
.cat-strip__item--table { --cat-color: var(--neon-amber); }
.cat-strip__item--race { --cat-color: var(--mist); }

.cat-strip__icon {
  display: flex;
  color: var(--cat-color);
}

.cat-strip__icon svg {
  display: block;
  width: 18px;
  height: 18px;
}

.cat-strip__label {
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.cat-strip__num {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  font-variant-numeric: tabular-nums;
  color: rgba(143, 163, 184, 0.7);
}

/* 滚动进度 */
.scroll-meter {
  height: 3px;
  background: rgba(143, 163, 184, 0.13);
  overflow: hidden;
}

.scroll-meter__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--neon-cyan), var(--neon-violet) 55%, var(--neon-coral));
  transition: transform 0.12s linear;
}

/* ==========================================================================
   2. 页脚
   ========================================================================== */

.site-footer {
  position: relative;
  margin-top: clamp(48px, 7vw, 96px);
  background: linear-gradient(180deg, var(--deep-night) 0%, var(--deep-ink) 72%);
  border-top: 2px solid rgba(45, 226, 230, 0.22);
  color: var(--sand);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.7fr 1fr 1fr 1.3fr;
  gap: clamp(24px, 3vw, 48px);
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: clamp(32px, 5vw, 64px) var(--pad-x) clamp(26px, 4vw, 46px);
}

.footer-brand {
  border-left: 4px solid var(--neon-cyan);
  padding-left: clamp(14px, 1.6vw, 20px);
}

.footer-brand__name {
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 2.2vw, 1.75rem);
  font-weight: 900;
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.footer-brand__intro {
  margin-top: 14px;
  max-width: 40ch;
  font-size: 0.9375rem;
  line-height: 1.9;
  color: var(--mist);
}

.footer-brand__status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 18px;
  padding: 5px 11px;
  border: 1px solid rgba(110, 243, 165, 0.45);
  border-radius: 2px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--neon-green);
}

.footer-brand__led {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--neon-green);
  box-shadow: 0 0 9px rgba(110, 243, 165, 0.85);
}

.footer-col__title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 16px;
  font-family: var(--font-body);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(143, 163, 184, 0.9);
}

.footer-col__title::before {
  content: "";
  width: 16px;
  height: 2px;
  background: var(--neon-cyan);
}

.footer-list li + li { margin-top: 10px; }

.footer-link {
  display: inline-block;
  color: var(--sand);
  font-size: 0.9375rem;
  line-height: 1.6;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.16s var(--ease-out), border-color 0.16s var(--ease-out);
}

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

.footer-link--sm { font-size: 0.8125rem; }

.footer-contact__row {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: 12px;
}

.footer-contact__label {
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(143, 163, 184, 0.75);
}

.footer-contact__value {
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--sand);
  overflow-wrap: anywhere;
}

.footer-note {
  margin-top: 16px;
  padding-left: 12px;
  border-left: 3px solid var(--deep-card);
  font-size: 0.8125rem;
  line-height: 1.75;
  color: var(--mist);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 24px;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 16px var(--pad-x) 28px;
  border-top: 1px solid var(--hairline);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.footer-legal__copy { margin: 0; }

.footer-legal__links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-legal__icp {
  margin: 0 0 0 auto;
  font-variant-numeric: tabular-nums;
}

.to-top {
  position: fixed;
  right: clamp(14px, 3vw, 28px);
  bottom: clamp(14px, 3vw, 28px);
  z-index: 70;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 15px;
  background: var(--neon-cyan);
  color: var(--deep-ink);
  font-size: 0.8125rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-decoration: none;
  border: 2px solid var(--deep-ink);
  border-radius: 2px;
  box-shadow: 4px 4px 0 rgba(2, 8, 18, 0.95);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.22s var(--ease-out), transform 0.22s var(--ease-out),
    visibility 0.22s var(--ease-out);
}

.to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* ==========================================================================
   3. 通用布局与内容组件
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--pad-x);
}

.section {
  padding-block: clamp(36px, 5.5vw, 84px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--neon-cyan);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: currentColor;
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: clamp(20px, 3vw, 36px);
}

.section-head__title {
  font-size: var(--step-2);
}

.section-head__text {
  margin-top: 10px;
  max-width: 62ch;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--mist);
}

.prose {
  max-width: 68ch;
  font-size: var(--step-0);
  line-height: 1.9;
}

.prose p + p { margin-top: 1em; }

.prose h2 {
  margin-top: 1.8em;
  font-size: var(--step-1);
}

.prose h3 {
  margin-top: 1.5em;
  font-size: 1.125rem;
  letter-spacing: 0;
}

.prose :where(ul, ol) {
  margin-top: 1em;
  padding-left: 1.2em;
  list-style: disc;
}

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

.prose a {
  color: var(--neon-cyan);
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border: 2px solid transparent;
  border-radius: 2px;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.4;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.18s var(--ease-out), box-shadow 0.18s var(--ease-out),
    background 0.18s var(--ease-out), color 0.18s var(--ease-out),
    border-color 0.18s var(--ease-out);
}

.btn--primary {
  background: var(--neon-coral);
  color: var(--deep-ink);
  border-color: var(--deep-ink);
  box-shadow: 4px 4px 0 rgba(2, 8, 18, 0.95);
}

.btn--primary:hover {
  transform: translate(-1px, -1px);
  box-shadow: 6px 6px 0 rgba(2, 8, 18, 0.95);
}

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

.btn--ghost:hover {
  background: rgba(45, 226, 230, 0.12);
}

.btn--small {
  padding: 7px 13px;
  font-size: 0.8125rem;
  box-shadow: 3px 3px 0 rgba(2, 8, 18, 0.95);
}

/* 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: 1px solid currentColor;
  border-radius: 2px;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  line-height: 1.7;
  text-transform: uppercase;
  white-space: nowrap;
}

.tag--strategy { color: var(--neon-coral); }
.tag--puzzle { color: var(--neon-cyan); }
.tag--action { color: var(--neon-violet); }
.tag--sim { color: var(--neon-green); }
.tag--table { color: var(--neon-amber); }
.tag--race { color: var(--mist); }

.tag--event {
  color: var(--neon-coral);
  background: rgba(255, 107, 90, 0.1);
}

/* 面包屑 */
.breadcrumb {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 16px var(--pad-x) 0;
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--mist);
}

.breadcrumb__list li:not(:last-child)::after {
  content: "/";
  margin-left: 8px;
  color: var(--hairline-strong);
}

.breadcrumb__link {
  color: var(--mist);
  text-decoration: none;
  transition: color 0.16s var(--ease-out);
}

.breadcrumb__link:hover { color: var(--neon-cyan); }

/* 网格 */
.grid {
  display: grid;
  gap: clamp(16px, 2.2vw, 28px);
}

.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)); }

/* 面板与卡片 */
.panel,
.card {
  position: relative;
  background: var(--deep-card);
  border: 2px solid rgba(143, 163, 184, 0.2);
  border-radius: 2px;
  padding: clamp(18px, 2.4vw, 28px);
}

.card {
  transition: transform 0.2s var(--ease-out), border-color 0.2s var(--ease-out),
    box-shadow 0.2s var(--ease-out);
}

.card:hover,
.card:focus-within {
  transform: translateY(-4px);
  border-color: var(--neon-cyan);
  box-shadow: 0 0 0 1px var(--neon-cyan), 6px 6px 0 rgba(2, 8, 18, 0.85);
}

/* 图片容器基础规则（页面阶段放入 img / picture） */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border: 2px solid var(--deep-card);
  border-radius: 2px;
  background:
    radial-gradient(120% 90% at 18% 12%, rgba(45, 226, 230, 0.2), transparent 62%),
    radial-gradient(100% 80% at 84% 88%, rgba(167, 139, 250, 0.22), transparent 60%),
    var(--deep-card);
}

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

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

.media-frame__caption {
  margin-top: 10px;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--mist);
}

/* 章节跟随目录链接（页面阶段使用） */
[data-spy-link] {
  transition: color 0.16s var(--ease-out), border-color 0.16s var(--ease-out);
}

[data-spy-link].is-active {
  color: var(--neon-cyan);
  border-bottom-color: var(--neon-cyan);
}

/* ==========================================================================
   4. 响应式
   ========================================================================== */

@media (max-width: 1180px) {
  .primary-nav__link {
    padding: 8px 9px;
    font-size: 0.875rem;
  }
}

@media (max-width: 960px) {
  html { scroll-padding-top: 180px; }

  .command-bar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
  }

  .primary-nav {
    order: 5;
    flex: 0 0 100%;
    display: none;
    margin-top: 4px;
    padding: 8px;
    background: var(--deep-ink);
    border: 2px solid rgba(45, 226, 230, 0.24);
    border-radius: 2px;
    box-shadow: 6px 6px 0 rgba(2, 8, 18, 0.95);
  }

  .primary-nav[data-open="true"] {
    display: block;
    animation: nav-drop 0.2s var(--ease-out);
  }

  @keyframes nav-drop {
    from { opacity: 0; transform: translateY(-6px); }
    to { opacity: 1; transform: translateY(0); }
  }

  .primary-nav__list {
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 2px;
  }

  .primary-nav__link {
    width: 100%;
    padding: 12px 14px;
    font-size: 1rem;
  }

  .primary-nav__link[aria-current="page"] { box-shadow: none; }

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

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

  .footer-brand { grid-column: 1 / -1; }

  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 700px) {
  .status-rail__inner {
    gap: 4px 0;
    padding: 6px var(--pad-x);
  }

  .status-rail__item {
    font-size: 0.6875rem;
  }

  .status-rail__item + .status-rail__item {
    margin-left: 12px;
    padding-left: 12px;
  }

  .cat-strip__item {
    padding: 7px 11px 7px 10px;
  }

  .cat-strip__label { font-size: 0.8125rem; }

  .footer-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }

  .footer-legal {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

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

  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: minmax(0, 1fr); }

  .to-top {
    padding: 9px 12px;
    font-size: 0.75rem;
  }
}

@media (max-width: 480px) {
  .brand__name { font-size: 1rem; }
  .btn--small { padding: 6px 10px; font-size: 0.75rem; }
  .nav-toggle__label { display: none; }
}

/* ==========================================================================
   5. 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;
  }

  .brand__dot { animation: none; }
  .card:hover,
  .card:focus-within { transform: none; }
  .cat-strip__item:hover,
  .cat-strip__item:focus-visible { transform: none; }
}