/* ============================================================
   NetFoxAI · 项目介绍落地页样式（深空科技主题）
   原生 CSS，无外部依赖
   目录：设计变量 / 基础重置 / 通用组件 / 导航栏 / Hero /
        项目介绍 / 核心功能 / 项目特色 / 技术理念 / 愿景 /
        页脚 / 动效 / 响应式 / 无障碍与减弱动效
   ============================================================ */

/* ============ 设计变量 ============ */
:root {
  color-scheme: dark;

  /* 品牌色（蓝）与科技青色点缀 */
  --brand-100: #dbeafe;
  --brand-200: #bfdbfe;
  --brand-400: #60a5fa;
  --brand-500: #3b82f6;
  --brand-600: #2563eb;
  --brand-700: #1d4ed8;
  --accent:    #22d3ee;

  /* 深空背景层级 */
  --bg-900: #04070f;
  --bg-800: #060913;
  --bg-700: #080e1d;
  --bg-600: #0b1428;

  /* 文字 */
  --ink-100: #eef2fb;
  --ink-300: #c3cde0;
  --ink-500: #93a0b8;
  --ink-600: #6b7893;

  /* 边框与面板（霓虹玻璃） */
  --line:        rgba(148, 180, 255, .13);
  --line-soft:   rgba(148, 180, 255, .07);
  --line-strong: rgba(148, 180, 255, .24);
  --card-bg:     linear-gradient(180deg, rgba(17, 26, 48, .62), rgba(10, 16, 32, .5));
  --card-inset:  inset 0 1px 0 rgba(255, 255, 255, .05);

  /* 圆角 */
  --radius-sm:   10px;
  --radius-md:   16px;
  --radius-lg:   20px;
  --radius-full: 999px;

  /* 阴影 / 辉光 */
  --shadow-card:  0 10px 28px rgba(2, 6, 18, .45);
  --shadow-float: 0 18px 44px rgba(2, 8, 30, .6);
  --glow-brand:   0 0 24px rgba(37, 99, 235, .4);
  --glow-line:    0 0 0 1px rgba(59, 130, 246, .22);

  /* 布局 */
  --container: 1200px;
  --header-h:  64px;
  --section-y: 104px;

  /* 字体 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas,
    "Liberation Mono", monospace;
}

/* ============ 基础重置 ============ */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  /* 锚点定位时为固定导航栏留出空间 */
  scroll-padding-top: calc(var(--header-h) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-500);
  background:
    radial-gradient(1100px 520px at 50% -220px, rgba(37, 99, 235, .12), transparent 70%),
    var(--bg-800);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

ul { list-style: none; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
svg { display: block; }

::selection { background: rgba(37, 99, 235, .55); color: #fff; }

/* 深色滚动条 */
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg-900); }
::-webkit-scrollbar-thumb {
  background: #1c2a4a;
  border: 2px solid var(--bg-900);
  border-radius: 6px;
}
::-webkit-scrollbar-thumb:hover { background: #2a3d66; }

/* 键盘焦点样式 */
:focus-visible {
  outline: 2px solid var(--brand-400);
  outline-offset: 3px;
}

/* ============ 通用组件 ============ */
.container {
  width: min(100% - 40px, var(--container));
  margin-inline: auto;
}

.section { padding: var(--section-y) 0; }
.section--soft {
  background: var(--bg-700);
  border-block: 1px solid var(--line-soft);
}

.section-head {
  max-width: 680px;
  margin: 0 auto 60px;
  text-align: center;
}

.section-kicker {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .14em;
  color: var(--brand-400);
}
.section-kicker::before {
  content: "//";
  color: var(--accent);
  text-shadow: 0 0 12px rgba(34, 211, 238, .6);
}

.section-title {
  font-size: clamp(28px, 3.6vw, 40px);
  line-height: 1.28;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--ink-100);
}

.section-desc {
  margin-top: 16px;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--ink-500);
}

/* 按钮 */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  transition: background .2s ease, color .2s ease, border-color .2s ease,
    box-shadow .25s ease, transform .15s ease, filter .2s ease;
}
.btn:active { transform: translateY(1px); }

/* 主按钮：蓝色渐变 + 辉光 + 悬停扫光 */
.btn-primary {
  overflow: hidden;
  background: linear-gradient(135deg, #1d4ed8, #2563eb 52%, #3b82f6);
  color: #fff;
  box-shadow: var(--glow-brand), inset 0 1px 0 rgba(255, 255, 255, .2);
}
.btn-primary:hover {
  filter: brightness(1.1);
  box-shadow: 0 0 34px rgba(59, 130, 246, .55), inset 0 1px 0 rgba(255, 255, 255, .25);
}
.btn-primary::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: -160px;
  width: 110px;
  background: linear-gradient(100deg, transparent, rgba(255, 255, 255, .28), transparent);
  transform: skewX(-20deg);
  pointer-events: none;
}
.btn-primary:hover::after { animation: btn-sheen .9s ease; }
@keyframes btn-sheen {
  from { transform: translateX(0) skewX(-20deg); }
  to   { transform: translateX(420px) skewX(-20deg); }
}

/* 次按钮：霓虹玻璃 */
.btn-secondary {
  background: rgba(148, 180, 255, .05);
  border-color: var(--line-strong);
  color: var(--ink-300);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}
.btn-secondary:hover {
  background: rgba(148, 180, 255, .1);
  border-color: rgba(96, 165, 250, .5);
  color: #fff;
  box-shadow: 0 0 18px rgba(59, 130, 246, .2);
}

/* 深色渐变面板上的白色按钮 */
.btn-light {
  background: linear-gradient(180deg, #ffffff, #dbe7ff);
  color: #0b1a3a;
  box-shadow: 0 0 32px rgba(96, 165, 250, .35), 0 10px 24px rgba(2, 8, 40, .4);
}
.btn-light:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 44px rgba(96, 165, 250, .55), 0 14px 30px rgba(2, 8, 40, .45);
}

.btn-lg { padding: 15px 32px; font-size: 16px; border-radius: 12px; }
.btn-sm { padding: 9px 18px; font-size: 14px; }

/* 行内文字链接（带箭头） */
.inline-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 28px;
  font-size: 15px;
  font-weight: 600;
  color: var(--brand-400);
  transition: color .2s ease, text-shadow .2s ease;
}
.inline-link span { transition: transform .2s ease; }
.inline-link:hover { color: #93c5fd; text-shadow: 0 0 16px rgba(96, 165, 250, .5); }
.inline-link:hover span { transform: translateX(4px); }

/* 跳过导航链接（无障碍） */
.skip-link {
  position: fixed;
  top: -56px;
  left: 16px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--bg-600);
  color: var(--brand-200);
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  box-shadow: var(--shadow-float);
  transition: top .2s ease;
}
.skip-link:focus { top: 12px; }

/* 品牌标识 */
.brand { display: inline-flex; align-items: center; gap: 10px; }
.brand-mark {
  display: block;
  width: 32px;
  height: 32px;
  border-radius: 9px;
  overflow: hidden;
  box-shadow: 0 0 16px rgba(37, 99, 235, .45);
  flex-shrink: 0;
}
.brand-mark svg { width: 100%; height: 100%; }
.brand-name {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--ink-100);
}

/* 渐变文字（蓝 → 青，带辉光） */
.text-gradient {
  background: linear-gradient(95deg, #60a5fa, #22d3ee);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 0 22px rgba(59, 130, 246, .4));
}

/* ============ 顶部导航栏 ============ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(6, 9, 19, .7);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .25s ease, box-shadow .25s ease, background .25s ease;
}
.site-header.is-scrolled {
  border-bottom-color: var(--line);
  background: rgba(6, 9, 19, .88);
  box-shadow: 0 4px 24px rgba(2, 6, 18, .5);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  height: var(--header-h);
}
.header-inner .brand { margin-right: auto; }

.nav-list { display: flex; align-items: center; gap: 30px; }

.nav-link {
  position: relative;
  padding: 8px 2px;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--ink-500);
  transition: color .2s ease, text-shadow .2s ease;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 2px;
  height: 2px;
  border-radius: 1px;
  background: linear-gradient(90deg, var(--brand-500), var(--accent));
  box-shadow: 0 0 10px rgba(59, 130, 246, .7);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .25s ease;
}
.nav-link:hover { color: var(--ink-100); }
.nav-link:hover::after { transform: scaleX(1); }

.header-actions { display: flex; align-items: center; gap: 12px; }

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 38px;
  height: 38px;
  padding: 0 8px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: rgba(148, 180, 255, .05);
}
.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  border-radius: 1px;
  background: var(--ink-300);
  transition: transform .25s ease, opacity .25s ease;
}
.nav-open .nav-toggle-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-open .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-open .nav-toggle-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* 移动端导航面板中的 CTA（桌面隐藏） */
.nav-cta-mobile { display: none; }

/* ============ 首屏 Hero ============ */
.hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 96px) 0 128px;
}

.hero-bg { position: absolute; inset: 0; pointer-events: none; }

/* 星点 */
.hero-stars {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(1px 1px at 25px 35px, rgba(255, 255, 255, .45), transparent),
    radial-gradient(1px 1px at 145px 85px, rgba(255, 255, 255, .3), transparent),
    radial-gradient(1.5px 1.5px at 85px 155px, rgba(147, 197, 253, .5), transparent),
    radial-gradient(1px 1px at 175px 165px, rgba(255, 255, 255, .25), transparent),
    radial-gradient(1px 1px at 55px 115px, rgba(103, 232, 249, .35), transparent);
  background-size: 200px 200px;
  opacity: .55;
  -webkit-mask-image: radial-gradient(ellipse 90% 80% at 50% 10%, #000 20%, transparent 75%);
  mask-image: radial-gradient(ellipse 90% 80% at 50% 10%, #000 20%, transparent 75%);
}

/* 极光光斑（缓慢漂移） */
.hero-aurora::before,
.hero-aurora::after {
  content: "";
  position: absolute;
  border-radius: 50%;
}
.hero-aurora::before {
  width: 620px;
  height: 380px;
  top: -150px;
  left: -130px;
  background: radial-gradient(closest-side, rgba(37, 99, 235, .4), transparent);
  animation: aurora-drift 18s ease-in-out infinite alternate;
}
.hero-aurora::after {
  width: 540px;
  height: 340px;
  right: -110px;
  bottom: -60px;
  background: radial-gradient(closest-side, rgba(34, 211, 238, .2), transparent);
  animation: aurora-drift 24s ease-in-out infinite alternate-reverse;
}
@keyframes aurora-drift {
  from { transform: translate3d(0, 0, 0) scale(1); }
  to   { transform: translate3d(70px, 34px, 0) scale(1.14); }
}

/* 荧光网格 */
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(96, 165, 250, .07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(96, 165, 250, .07) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 15%, #000 25%, transparent 72%);
  mask-image: radial-gradient(ellipse 90% 70% at 50% 15%, #000 25%, transparent 72%);
}

.hero-glow { position: absolute; border-radius: 50%; }
.hero-glow--a {
  width: 780px;
  height: 540px;
  top: -250px;
  left: 50%;
  transform: translateX(-50%);
  background: radial-gradient(closest-side, rgba(37, 99, 235, .3), transparent);
}
.hero-glow--b {
  width: 540px;
  height: 440px;
  right: -140px;
  bottom: -180px;
  background: radial-gradient(closest-side, rgba(34, 211, 238, .1), transparent);
}

/* 节点连接图（带数据流光与脉冲） */
.hero-nodes {
  position: absolute;
  top: 56px;
  right: -32px;
  width: min(560px, 44vw);
  height: auto;
  opacity: .85;
  filter: drop-shadow(0 0 10px rgba(37, 99, 235, .25));
}
.flow-lines path { animation: flow-dash 2.8s linear infinite; }
@keyframes flow-dash { to { stroke-dashoffset: -32; } }

.node-pulse {
  transform-box: fill-box;
  transform-origin: center;
  animation: node-pulse 3.4s ease-out infinite;
}
.node-pulse--delay { animation-delay: 1.5s; }
@keyframes node-pulse {
  0%       { transform: scale(1);   opacity: .85; }
  70%, 100%{ transform: scale(2.2); opacity: 0; }
}

/* 几何装饰 */
.hero-shape { position: absolute; }
.hero-shape--ring {
  left: 6%;
  top: 26%;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  border: 1.5px solid rgba(96, 165, 250, .28);
  box-shadow: 0 0 30px rgba(59, 130, 246, .15), inset 0 0 24px rgba(59, 130, 246, .1);
}
.hero-shape--diamond {
  left: 14%;
  bottom: 16%;
  width: 26px;
  height: 26px;
  border: 1.5px solid rgba(34, 211, 238, .45);
  background: rgba(34, 211, 238, .12);
  box-shadow: 0 0 18px rgba(34, 211, 238, .3);
  border-radius: 4px;
  transform: rotate(45deg);
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

/* 顶部胶囊标签 */
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 16px;
  border-radius: var(--radius-full);
  background: rgba(11, 20, 40, .65);
  border: 1px solid rgba(96, 165, 250, .3);
  box-shadow: 0 0 18px rgba(37, 99, 235, .2), var(--card-inset);
  color: #a8c7f5;
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: .1em;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}
.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px rgba(34, 211, 238, .9);
  animation: dot-breathe 2.6s ease-in-out infinite;
}
@keyframes dot-breathe {
  0%, 100% { opacity: 1; }
  50%      { opacity: .45; }
}

.hero-title {
  margin-top: 26px;
  font-size: clamp(40px, 6.4vw, 60px);
  line-height: 1.18;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--ink-100);
  text-shadow: 0 0 44px rgba(59, 130, 246, .2);
}

.hero-subtitle {
  margin-top: 22px;
  max-width: 660px;
  font-size: clamp(15.5px, 1.6vw, 18px);
  line-height: 1.9;
  color: var(--ink-500);
}

.hero-actions {
  margin-top: 40px;
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

/* ============ 项目介绍 ============ */
.about-grid {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 72px;
  align-items: center;
}
.about-content .section-desc { max-width: 540px; }

.keyword-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* 玻璃卡片基座（含鼠标跟随光斑） */
.keyword-card,
.feature-card { position: relative; overflow: hidden; }
.keyword-card::after,
.feature-card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(340px circle at var(--mx, 50%) var(--my, 50%),
    rgba(59, 130, 246, .14), transparent 65%);
  opacity: 0;
  transition: opacity .3s ease;
  pointer-events: none;
}
.keyword-card:hover::after,
.feature-card:hover::after { opacity: 1; }

.keyword-card {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 22px 24px;
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  box-shadow: var(--card-inset), var(--shadow-card);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease;
}
.keyword-card:hover {
  transform: translateY(-3px);
  border-color: rgba(96, 165, 250, .4);
  box-shadow: var(--card-inset), var(--glow-line), var(--shadow-float);
}

.keyword-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  border-radius: 12px;
  background: rgba(59, 130, 246, .12);
  border: 1px solid rgba(96, 165, 250, .3);
  color: var(--brand-400);
  transition: background .25s ease, color .25s ease, box-shadow .25s ease;
}
.keyword-icon svg { width: 22px; height: 22px; }
.keyword-card:hover .keyword-icon {
  background: linear-gradient(135deg, var(--brand-600), var(--brand-500));
  border-color: transparent;
  color: #fff;
  box-shadow: 0 0 18px rgba(59, 130, 246, .55);
}

.keyword-body { min-width: 0; }

.keyword-en {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--accent);
}
.keyword-zh {
  margin-top: 4px;
  font-size: 16.5px;
  font-weight: 600;
  color: var(--ink-100);
}
.keyword-desc {
  margin-top: 6px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-500);
}

/* ============ 核心功能 ============ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  padding: 32px 28px;
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--card-inset), var(--shadow-card);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease;
}
.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--brand-500), var(--accent));
  box-shadow: 0 0 14px rgba(59, 130, 246, .8);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .3s ease;
}
.feature-card:hover {
  transform: translateY(-5px);
  border-color: rgba(96, 165, 250, .4);
  box-shadow: var(--card-inset), var(--glow-line), var(--shadow-float);
}
.feature-card:hover::before { transform: scaleX(1); }

.feature-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  margin-bottom: 20px;
  border-radius: 13px;
  background: rgba(59, 130, 246, .12);
  border: 1px solid rgba(96, 165, 250, .3);
  color: var(--brand-400);
  transition: background .25s ease, color .25s ease, box-shadow .25s ease;
}
.feature-icon svg { width: 24px; height: 24px; }
.feature-card:hover .feature-icon {
  background: linear-gradient(135deg, var(--brand-600), var(--brand-500));
  border-color: transparent;
  color: #fff;
  box-shadow: 0 0 22px rgba(59, 130, 246, .6);
}

.feature-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .12em;
  color: var(--accent);
}
.feature-title {
  margin-top: 8px;
  font-size: 19px;
  font-weight: 600;
  color: var(--ink-100);
}
.feature-desc {
  margin-top: 10px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-500);
}

/* ============ 项目特色 ============ */
.highlights-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.highlight-item {
  padding: 30px 24px 8px;
  border-top: 2px solid var(--line-strong);
  transition: border-color .3s ease;
}
.highlight-item:hover { border-top-color: var(--brand-500); }

.highlight-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 44px;
  font-weight: 700;
  line-height: 1;
  color: rgba(96, 165, 250, .28);
  transition: color .3s ease, text-shadow .3s ease;
}
.highlight-item:hover .highlight-num {
  color: var(--brand-400);
  text-shadow: 0 0 24px rgba(96, 165, 250, .55);
}

.highlight-title {
  margin-top: 18px;
  font-size: 18px;
  font-weight: 600;
  color: var(--ink-100);
}
.highlight-desc {
  margin-top: 10px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-500);
}

/* ============ 技术与开放理念 ============ */
.tech { position: relative; overflow: hidden; }
.tech-inner {
  position: relative;
  width: min(100% - 40px, 760px);
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.tech-divider {
  display: flex;
  align-items: center;
  gap: 16px;
  width: 100%;
  max-width: 480px;
  margin: 44px 0 28px;
}
.tech-divider span {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(96, 165, 250, .35));
}
.tech-divider span:last-child {
  background: linear-gradient(90deg, rgba(96, 165, 250, .35), transparent);
}
.tech-divider em {
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 12px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--ink-600);
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}
.tech-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: rgba(11, 20, 40, .65);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-full);
  box-shadow: var(--card-inset);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 500;
  color: #b7c4dd;
  transition: transform .2s ease, border-color .2s ease, color .2s ease, box-shadow .2s ease;
}
.tech-tag::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px rgba(34, 211, 238, .8);
}
.tech-tag:hover {
  transform: translateY(-2px);
  border-color: rgba(96, 165, 250, .5);
  color: #e5edfd;
  box-shadow: 0 0 20px rgba(37, 99, 235, .3), var(--card-inset);
}

.tech-note {
  margin-top: 28px;
  font-size: 13px;
  color: var(--ink-600);
}

/* ============ 项目愿景（悬浮发光面板） ============ */
.vision { padding: calc(var(--section-y) + 8px) 0; }

.vision-panel {
  position: relative;
  overflow: hidden;
  padding: 104px 48px;
  border-radius: 24px;
  border: 1px solid rgba(96, 165, 250, .25);
  background:
    radial-gradient(900px 420px at 50% -100px, rgba(59, 130, 246, .3), transparent 70%),
    linear-gradient(160deg, #0b1a3d 0%, #0e2a63 48%, #0b1e48 100%);
  box-shadow:
    0 0 60px rgba(37, 99, 235, .18),
    0 30px 80px rgba(2, 6, 20, .6),
    inset 0 1px 0 rgba(255, 255, 255, .1);
  text-align: center;
}

.vision-bg { position: absolute; inset: 0; pointer-events: none; }
.vision-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .05) 1px, transparent 1px);
  background-size: 52px 52px;
  -webkit-mask-image: radial-gradient(ellipse 75% 85% at 50% 50%, #000 30%, transparent 75%);
  mask-image: radial-gradient(ellipse 75% 85% at 50% 50%, #000 30%, transparent 75%);
}
.vision-glow {
  position: absolute;
  width: 640px;
  height: 420px;
  left: 50%;
  top: -170px;
  transform: translateX(-50%);
  background: radial-gradient(closest-side, rgba(96, 165, 250, .45), transparent);
}
.vision-orb {
  position: absolute;
  width: 420px;
  height: 300px;
  left: -130px;
  bottom: -150px;
  background: radial-gradient(closest-side, rgba(34, 211, 238, .22), transparent);
}

.vision-inner {
  position: relative;
  width: min(100%, 720px);
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.vision-title {
  font-size: clamp(28px, 4.2vw, 44px);
  line-height: 1.35;
  font-weight: 700;
  letter-spacing: -.01em;
  color: #fff;
  text-shadow: 0 0 40px rgba(96, 165, 250, .35);
}
.vision-desc {
  margin-top: 20px;
  max-width: 620px;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.9;
  color: rgba(219, 234, 254, .78);
}
.vision .btn-light { margin-top: 40px; }
.vision-sub {
  margin-top: 22px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .18em;
  color: rgba(191, 219, 254, .6);
}

/* ============ 页脚 ============ */
.site-footer {
  position: relative;
  background: var(--bg-900);
  border-top: 1px solid var(--line);
  padding-top: 64px;
}
/* 顶部辉光细线 */
.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 50%;
  transform: translateX(-50%);
  width: min(720px, 80%);
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(96, 165, 250, .55), transparent);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 56px;
}

.footer-org {
  margin-top: 14px;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-300);
}
.footer-desc {
  margin-top: 10px;
  max-width: 360px;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ink-600);
}

.footer-col-title {
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--brand-400);
}
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a {
  font-size: 13.5px;
  color: var(--ink-500);
  transition: color .2s ease;
}
.footer-links a:hover { color: #93c5fd; }

.footer-bottom {
  border-top: 1px solid var(--line-soft);
  padding: 22px 0;
}
.footer-bottom-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.footer-copy { font-size: 13px; color: var(--ink-600); }
.footer-domain {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-600);
}

/* ============ 入场渐入动效（仅在 JS 可用时生效） ============ */
.js .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .7s ease, transform .7s ease;
  transition-delay: var(--reveal-delay, 0s);
}
.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ============ 响应式 ============ */
@media (max-width: 1100px) {
  .hero-nodes { display: none; }
}

@media (max-width: 960px) {
  .about-grid { grid-template-columns: 1fr; gap: 48px; }
  .about-content .section-desc { max-width: none; }

  .features-grid { grid-template-columns: 1fr 1fr; }
  .features-grid .feature-card:last-child {
    grid-column: 1 / -1;
    width: 100%;
    max-width: 560px;
    margin-inline: auto;
  }

  .highlights-grid { grid-template-columns: 1fr; gap: 8px; }
  .highlight-item { padding: 24px 0 12px; }
}

@media (max-width: 880px) {
  :root { --section-y: 80px; }

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

  .main-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    padding: 10px 24px 20px;
    background: rgba(7, 11, 24, .97);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 18px 40px rgba(2, 6, 18, .6);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity .25s ease, transform .25s ease, visibility .25s ease;
  }
  .site-header.nav-open .main-nav {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .nav-list { flex-direction: column; align-items: stretch; gap: 4px; }
  .nav-link {
    display: block;
    padding: 12px 10px;
    font-size: 15px;
    border-radius: 8px;
    transition: background .2s ease, color .2s ease;
  }
  .nav-link::after { display: none; }
  .nav-link:hover { background: rgba(148, 180, 255, .07); }

  .nav-cta-mobile { display: flex; width: 100%; margin-top: 14px; }
}

@media (max-width: 700px) {
  .hero-shape { display: none; }
  .vision-panel { padding: 72px 24px; border-radius: 20px; }
}

@media (max-width: 640px) {
  .hero { padding: calc(var(--header-h) + 64px) 0 88px; }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    max-width: 340px;
  }

  .features-grid { grid-template-columns: 1fr; }
  .features-grid .feature-card:last-child { max-width: none; }

  .footer-grid { grid-template-columns: 1fr 1fr; gap: 36px; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 480px) {
  .container { width: min(100% - 32px, var(--container)); }
  .header-cta { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
}

/* ============ 减弱动效（尊重系统设置） ============ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }

  .js .reveal {
    opacity: 1;
    transform: none;
  }
}