/* ============================================================
   KI竞技 /assets/site.css
   全站共享样式 — 赛博朋克 × 技术蓝图
   ============================================================ */

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd, ul, ol { margin: 0; padding: 0; }
ul, ol { list-style: none; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
img { max-width: 100%; height: auto; display: block; }

/* ---------- CSS 变量 ---------- */
:root {
  --color-bg: #0B0F2A;
  --color-fg: #F5F5F7;
  --color-primary: #4A00E0;
  --color-primary-bright: #8B5CF6;
  --color-accent: #C6FF00;
  --color-wine: #800020;
  --color-deep: #0B1E2D;
  --color-light: #F2F0E0;
  --color-gray: #888888;
  --color-success: #00FF66;

  --font-title: Impact, 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Microsoft YaHei', 'PingFang SC', sans-serif;
  --font-accent: Georgia, 'Times New Roman', serif;

  --container-w: 1280px;
  --gap: 24px;
  --header-h: 76px;
  --header-h-mobile: 64px;

  --radius-pill: 999px;
  --radius-box: 10px;
  --radius-card: 14px;

  --t-fast: 0.18s ease;
  --t-base: 0.28s cubic-bezier(0.4, 0, 0.2, 1);

  --z-header: 100;
  --z-skip: 999;
  --z-progress: 1000;
}

/* ---------- 基础 ---------- */
body {
  background-color: var(--color-bg);
  color: var(--color-fg);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-title);
  color: var(--color-fg);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: 0.01em;
}
h1 { font-size: clamp(44px, 7vw, 76px); }
h2 { font-size: clamp(28px, 4.5vw, 48px); }
h3 { font-size: clamp(20px, 3vw, 26px); }

p { margin-bottom: 16px; }
p:last-child { margin-bottom: 0; }

::selection {
  background: var(--color-accent);
  color: #0B0F2A;
}

/* ---------- 焦点 ---------- */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: -120px;
  left: 16px;
  z-index: var(--z-skip);
  display: inline-flex;
  align-items: center;
  padding: 12px 24px;
  background: var(--color-accent);
  color: #000;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  border-radius: 6px;
  box-shadow: 0 4px 20px rgba(198, 255, 0, 0.4);
  transition: top var(--t-fast);
}
.skip-link:focus-visible {
  top: 12px;
}

/* ---------- 滚动进度 ---------- */
.scroll-progress {
  position: absolute;
  top: 0;
  left: 0;
  z-index: var(--z-progress);
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  box-shadow: 0 0 12px rgba(198, 255, 0, 0.55);
  pointer-events: none;
  will-change: width;
}

/* ---------- 内容容器 ---------- */
.container {
  width: 100%;
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: 24px;
}

/* ---------- 章节 ---------- */
.section {
  padding: 72px 0;
  position: relative;
}
.section--dark { background-color: var(--color-bg); }
.section--deep { background-color: var(--color-deep); }
.section--light {
  background-color: var(--color-light);
  color: #20242A;
}
.section--light h1,
.section--light h2,
.section--light h3 { color: #20242A; }

/* ---------- 页面头部 ---------- */
.page-head {
  padding: 48px 0 28px;
  border-bottom: 1px solid rgba(245, 245, 247, 0.1);
  margin-bottom: 48px;
}
.page-title {
  font-family: var(--font-title);
  font-size: clamp(36px, 5vw, 56px);
  line-height: 1.05;
  margin-bottom: 8px;
}
.page-desc {
  color: var(--color-gray);
  font-size: 16px;
  max-width: 60ch;
}

/* ---------- 排版辅助 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--color-accent);
  margin-bottom: 16px;
}
.eyebrow::before {
  content: '';
  display: inline-block;
  width: 24px;
  height: 2px;
  background: var(--color-primary);
}

.section-title {
  font-family: var(--font-title);
  font-size: clamp(28px, 4.5vw, 48px);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 16px;
}
.section-desc {
  max-width: 56ch;
  color: var(--color-gray);
  font-size: 16px;
  line-height: 1.7;
  margin-bottom: 32px;
}
.section--light .section-desc { color: #555E63; }

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 28px;
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
  border: 1px solid transparent;
  transition: all var(--t-base);
  white-space: nowrap;
  cursor: pointer;
}
.btn--primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-bright) 100%);
  color: #fff;
  border-color: rgba(198, 255, 0, 0.25);
  box-shadow: 0 4px 18px rgba(74, 0, 224, 0.45);
}
.btn--primary:hover {
  border-color: var(--color-accent);
  box-shadow: 0 0 24px rgba(74, 0, 224, 0.65), 0 0 12px rgba(198, 255, 0, 0.3);
  transform: translateY(-2px);
}
.btn--ghost {
  background: rgba(245, 245, 247, 0.05);
  color: var(--color-fg);
  border-color: rgba(245, 245, 247, 0.28);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.btn--ghost:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  box-shadow: inset 0 0 16px rgba(198, 255, 0, 0.12);
}

/* ---------- 卡片 ---------- */
.card {
  position: relative;
  padding: 28px 24px;
  border-radius: var(--radius-card);
  background: rgba(245, 245, 247, 0.05);
  border: 1px solid rgba(245, 245, 247, 0.1);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: all var(--t-base);
}
.card:hover {
  border-color: rgba(198, 255, 0, 0.35);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35), 0 0 16px rgba(74, 0, 224, 0.2);
  transform: translateY(-3px);
}
.card--wine {
  border-color: rgba(128, 0, 32, 0.5);
  background: linear-gradient(135deg, rgba(128, 0, 32, 0.18), rgba(245, 245, 247, 0.03));
}
.card--deep {
  background: rgba(11, 30, 45, 0.75);
  border-color: rgba(74, 0, 224, 0.25);
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
  font-size: 13px;
  color: var(--color-gray);
}
.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.breadcrumb li:not(:last-child)::after {
  content: '/';
  font-family: var(--font-accent);
  color: rgba(136, 136, 136, 0.6);
}
.breadcrumb a {
  color: var(--color-gray);
  transition: color var(--t-fast);
}
.breadcrumb a:hover {
  color: var(--color-accent);
}
.breadcrumb [aria-current="page"] {
  color: var(--color-fg);
  font-weight: 600;
}

/* ---------- 网格 ---------- */
.grid {
  display: grid;
  gap: 24px;
}
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

/* ---------- 图片容器 ---------- */
.image-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-box);
  border: 1px solid rgba(245, 245, 247, 0.15);
  background:
    linear-gradient(135deg, rgba(74, 0, 224, 0.12), rgba(198, 255, 0, 0.05)),
    rgba(11, 30, 45, 0.6);
  aspect-ratio: 16 / 9;
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
}
.image-frame--wide { aspect-ratio: 16 / 9; }
.image-frame--tall { aspect-ratio: 3 / 4; }
.image-frame--square { aspect-ratio: 1 / 1; }
.image-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 标签胶囊 ---------- */
.tag-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-fg);
  background: rgba(245, 245, 247, 0.06);
  border: 1px solid rgba(198, 255, 0, 0.35);
  border-radius: var(--radius-pill);
  white-space: nowrap;
}
.tag-chip--wine {
  border-color: rgba(128, 0, 32, 0.5);
  color: #ffb3a0;
}

/* ---------- 状态点 ---------- */
.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-gray);
  margin-right: 8px;
  vertical-align: baseline;
  animation: status-pulse 2s ease-in-out infinite;
}
.status-dot--success { background: var(--color-success); }
.status-dot--primary { background: var(--color-primary); }
@keyframes status-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* ---------- 图例组件 ---------- */
.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 24px;
  font-size: 13px;
  color: var(--color-gray);
}
.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  line-height: 1.4;
}
.legend-swatch {
  width: 12px;
  height: 12px;
  border-radius: 3px;
  background: currentColor;
  border: 1px solid rgba(245, 245, 247, 0.3);
}

/* ---------- 框景首屏 ---------- */
.hero-frame {
  position: relative;
  padding: 56px 48px;
  border-radius: var(--radius-card);
  background:
    linear-gradient(135deg, rgba(74, 0, 224, 0.12), rgba(11, 15, 42, 0.4)),
    rgba(11, 30, 45, 0.45);
  border: 1px solid rgba(74, 0, 224, 0.3);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  clip-path: polygon(0 0, calc(100% - 28px) 0, 100% 28px, 100% 100%, 28px 100%, 0 calc(100% - 28px));
}
.hero-frame::before {
  content: '';
  position: absolute;
  top: 12px;
  right: 40px;
  width: 80px;
  height: 28px;
  background-image: repeating-linear-gradient(90deg, rgba(198, 255, 0, 0.5) 0 1px, transparent 1px 8px);
  -webkit-mask-image: linear-gradient(90deg, #000 0%, transparent 100%);
  mask-image: linear-gradient(90deg, #000 0%, transparent 100%);
  opacity: 0.6;
}
.hero-frame::after {
  content: '';
  position: absolute;
  bottom: 12px;
  left: 24px;
  width: 60px;
  height: 20px;
  background-image: repeating-linear-gradient(90deg, rgba(245, 245, 247, 0.35) 0 1px, transparent 1px 6px);
  opacity: 0.4;
  pointer-events: none;
}

/* ---------- 坐标网格 ---------- */
.coordinate-grid {
  position: relative;
  background-image:
    linear-gradient(rgba(74, 0, 224, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(74, 0, 224, 0.07) 1px, transparent 1px);
  background-size: 48px 48px;
}

/* ---------- 分页 ---------- */
.pagination {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-top: 40px;
}
.pagination a,
.pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 42px;
  height: 42px;
  padding: 0 14px;
  border-radius: 8px;
  background: rgba(245, 245, 247, 0.05);
  border: 1px solid rgba(245, 245, 247, 0.12);
  color: var(--color-fg);
  font-size: 14px;
  font-weight: 600;
  transition: all var(--t-fast);
}
.pagination a:hover {
  border-color: var(--color-accent);
  background: rgba(198, 255, 0, 0.08);
  color: var(--color-accent);
}
.pagination .pagination-current {
  border-color: var(--color-primary);
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-bright));
  box-shadow: 0 0 14px rgba(74, 0, 224, 0.4);
  color: #fff;
}

/* ============ 头部 ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background-color: rgba(11, 15, 42, 0.94);
  background-image:
    linear-gradient(rgba(74, 0, 224, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(74, 0, 224, 0.08) 1px, transparent 1px);
  background-size: 32px 32px;
  border-bottom: 1px solid rgba(74, 0, 224, 0.35);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.header-inner {
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: 24px;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

/* ---------- 品牌 ---------- */
.brand {
  flex-shrink: 0;
}
.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--color-fg);
}
.brand-mark {
  font-family: var(--font-title);
  font-size: 38px;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.02em;
  padding: 4px 8px 4px 10px;
  color: var(--color-fg);
  border: 2px solid rgba(74, 0, 224, 0.75);
  background: linear-gradient(135deg, rgba(74, 0, 224, 0.28), rgba(139, 92, 246, 0.08));
  clip-path: polygon(0 0, calc(100% - 9px) 0, 100% 9px, 100% 100%, 9px 100%, 0 calc(100% - 9px));
  text-shadow: 0 0 16px rgba(74, 0, 224, 0.9);
  transition: all var(--t-base);
}
.brand-link:hover .brand-mark {
  border-color: var(--color-accent);
  text-shadow: 0 0 18px rgba(198, 255, 0, 0.5), 0 0 24px rgba(74, 0, 224, 0.9);
}
.brand-copy {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}
.brand-name {
  font-family: var(--font-title);
  font-size: 20px;
  font-weight: 900;
  letter-spacing: 0.08em;
}
.brand-tagline {
  font-family: var(--font-accent);
  font-size: 11px;
  font-style: italic;
  color: var(--color-gray);
  letter-spacing: 0.12em;
  white-space: nowrap;
}

/* ---------- 头部工具栏 ---------- */
.header-tools {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-shrink: 1;
}

/* ---------- 主导航 ---------- */
.main-nav {
  display: flex;
  align-items: center;
}
.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
  counter-reset: nav-counter;
}
.nav-item {
  counter-increment: nav-counter;
}
.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  color: rgba(245, 245, 247, 0.72);
  font-size: 14px;
  font-weight: 500;
  font-family: var(--font-body);
  white-space: nowrap;
  transition: all var(--t-fast);
  position: relative;
}
.nav-index {
  font-family: var(--font-accent);
  font-style: italic;
  font-size: 11px;
  color: var(--color-gray);
  line-height: 1;
}
.nav-index::before {
  content: counter(nav-counter, decimal-leading-zero);
}
.nav-link:hover {
  color: var(--color-fg);
  border-color: rgba(198, 255, 0, 0.45);
  background: rgba(198, 255, 0, 0.05);
  box-shadow: 0 0 14px rgba(198, 255, 0, 0.15);
}
.nav-link[aria-current="page"] {
  color: #fff;
  border-color: rgba(74, 0, 224, 0.9);
  background: linear-gradient(135deg, rgba(74, 0, 224, 0.9), rgba(139, 92, 246, 0.55));
  box-shadow: 0 0 20px rgba(74, 0, 224, 0.45);
}
.nav-link[aria-current="page"] .nav-index {
  color: var(--color-accent);
}

/* ---------- 头部 CTA ---------- */
.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-bright) 100%);
  border: 1px solid rgba(198, 255, 0, 0.25);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
  box-shadow: 0 2px 14px rgba(74, 0, 224, 0.45);
  transition: all var(--t-base);
  white-space: nowrap;
  flex-shrink: 0;
}
.nav-cta:hover {
  border-color: var(--color-accent);
  box-shadow: 0 0 22px rgba(198, 255, 0, 0.35), 0 0 18px rgba(74, 0, 224, 0.6);
  transform: translateY(-2px);
}
.nav-cta-arrow {
  font-size: 14px;
  transition: transform var(--t-fast);
}
.nav-cta:hover .nav-cta-arrow {
  transform: translate(2px, -2px);
}

/* ---------- 移动端菜单按钮 ---------- */
.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid rgba(245, 245, 247, 0.2);
  background: rgba(11, 15, 42, 0.72);
  transition: all var(--t-fast);
}
.nav-toggle:hover {
  border-color: var(--color-accent);
}
.nav-toggle-box {
  display: flex;
  flex-direction: column;
  gap: 5px;
  width: 18px;
}
.nav-toggle-line {
  height: 2px;
  background: var(--color-fg);
  border-radius: 1px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}
.nav-toggle-label {
  font-size: 11px;
  color: var(--color-gray);
  letter-spacing: 0.08em;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1) {
  transform: translateY(4px) rotate(45deg);
  background: var(--color-accent);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(3) {
  transform: translateY(-4px) rotate(-45deg);
  background: var(--color-accent);
}

/* ============ 页脚 ============ */
.site-footer {
  background-color: #05081A;
  background-image:
    linear-gradient(rgba(74, 0, 224, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(74, 0, 224, 0.045) 1px, transparent 1px);
  background-size: 48px 42px;
  position: relative;
  overflow: hidden;
}
.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent) 50%, transparent 100%);
  opacity: 0.8;
}

.footer-inner {
  max-width: var(--container-w);
  margin-inline: auto;
  padding: 56px 24px 24px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1.4fr;
  gap: 40px;
  margin-bottom: 48px;
}
.footer-col {
  min-width: 0;
}

/* ---------- 页脚品牌 ---------- */
.footer-brand-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}
.footer-brand-mark {
  font-family: var(--font-title);
  font-size: 32px;
  font-weight: 900;
  padding: 3px 7px;
  color: var(--color-fg);
  border: 2px solid rgba(74, 0, 224, 0.6);
  background: rgba(74, 0, 224, 0.15);
  clip-path: polygon(0 0, calc(100% - 7px) 0, 100% 7px, 100% 100%, 7px 100%, 0 calc(100% - 7px));
  text-shadow: 0 0 12px rgba(74, 0, 224, 0.7);
  line-height: 1;
  transition: all var(--t-base);
}
.footer-brand-link:hover .footer-brand-mark {
  border-color: var(--color-accent);
  text-shadow: 0 0 14px rgba(198, 255, 0, 0.45);
}
.footer-brand-copy {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}
.footer-brand-name {
  font-family: var(--font-title);
  font-size: 20px;
  font-weight: 900;
  letter-spacing: 0.1em;
}
.footer-brand-tagline {
  font-family: var(--font-accent);
  font-size: 11px;
  font-style: italic;
  color: var(--color-gray);
  letter-spacing: 0.1em;
}

.footer-trust {
  max-width: 46ch;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(245, 245, 247, 0.65);
  margin-bottom: 16px;
}
.footer-contact-note {
  font-size: 12px;
  color: var(--color-gray);
  line-height: 1.6;
}

/* ---------- 页脚目录 ---------- */
.footer-heading {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--color-accent);
  margin-bottom: 20px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(74, 0, 224, 0.4);
  position: relative;
}
.footer-heading::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 48px;
  height: 2px;
  background: var(--color-primary);
}

.footer-nav-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-nav-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: rgba(245, 245, 247, 0.68);
  transition: all var(--t-fast);
}
.footer-nav-link::before {
  content: '▸';
  font-size: 11px;
  color: var(--color-primary);
  transition: color var(--t-fast), transform var(--t-fast);
}
.footer-nav-link:hover {
  color: var(--color-accent);
}
.footer-nav-link:hover::before {
  color: var(--color-accent);
  transform: translateX(3px);
}

/* ---------- 页脚联系 ---------- */
.footer-contact-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
}
.footer-contact-item {
  font-size: 14px;
  color: rgba(245, 245, 247, 0.68);
  line-height: 1.6;
}
.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}
.footer-legal-link {
  font-size: 13px;
  color: var(--color-gray);
  transition: color var(--t-fast);
}
.footer-legal-link:hover {
  color: var(--color-accent);
}

/* ---------- 页脚底部 ---------- */
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding-top: 20px;
  border-top: 1px solid rgba(245, 245, 247, 0.08);
}
.footer-copyright {
  font-size: 13px;
  color: rgba(245, 245, 247, 0.5);
  margin: 0;
}
.footer-icp {
  font-size: 13px;
  color: rgba(245, 245, 247, 0.4);
  letter-spacing: 0.05em;
  margin: 0;
}

/* ============ 响应式 ============ */

@media (max-width: 1100px) {
  .nav-link { padding: 8px 10px; font-size: 13px; }
  .header-tools { gap: 12px; }
  .nav-index { font-size: 10px; }
}

@media (max-width: 1024px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 900px) {
  .nav-toggle { display: inline-flex; }

  .header-inner {
    height: var(--header-h-mobile);
  }

  .main-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(7, 9, 22, 0.98);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(74, 0, 224, 0.5);
    box-shadow: 0 24px 40px rgba(0, 0, 0, 0.55);
    max-height: calc(100vh - var(--header-h-mobile));
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s;
  }
  .main-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px 24px 24px;
  }
  .nav-item {
    border-bottom: 1px solid rgba(245, 245, 247, 0.06);
  }
  .nav-item:last-child {
    border-bottom: none;
  }
  .nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 8px;
    border-radius: 0;
    border: none;
    font-size: 16px;
  }
  .nav-link:hover {
    background: transparent;
    border-color: transparent;
    box-shadow: none;
  }
  .nav-link[aria-current="page"] {
    background: transparent;
    border: none;
    box-shadow: none;
    color: var(--color-accent);
  }

  .nav-cta {
    padding: 9px 14px;
    font-size: 12px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 640px) {
  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .brand-tagline { display: none; }
  .header-inner {
    padding-inline: 16px;
    gap: 12px;
  }
  .container {
    padding-inline: 16px;
  }
  .nav-cta {
    padding: 8px 12px;
    font-size: 12px;
  }
  .nav-cta-arrow { display: none; }
  .hero-frame {
    padding: 24px 20px;
  }
  .breadcrumb {
    font-size: 12px;
  }
}

@media (max-width: 360px) {
  .brand-mark { font-size: 30px; }
  .brand-name { font-size: 16px; }
  .nav-cta { padding: 8px 10px; }
  .nav-toggle { padding: 8px 10px; }
}

/* ============ 降低动画偏好 ============ */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .scroll-progress {
    will-change: auto;
  }
}