/* ============================================================
   飞虹智 klai.top · 科技蓝深空风设计系统 (Design System)
   纯静态 / 无框架 / 全站共享
   晋江市飞虹智科技企业管理有限公司 · 飞扬企源研发中心
   ============================================================ */

/* ---------- 设计 Token ---------- */
:root {
  /* 深空背景层 */
  --bg-void: #060912;
  --bg-deep: #0a0f1e;
  --bg-panel: #0e1525;
  --bg-card: rgba(255, 255, 255, 0.035);
  --bg-card-hover: rgba(59, 130, 246, 0.08);
  --bg-elev: rgba(16, 24, 44, 0.72);

  /* 主色：蓝 → 青 渐变 */
  --c-blue: #3b82f6;
  --c-cyan: #22d3ee;
  --c-indigo: #6366f1;
  --c-violet: #8b5cf6;
  --grad-primary: linear-gradient(120deg, #3b82f6 0%, #22d3ee 100%);
  --grad-soft: linear-gradient(120deg, rgba(59,130,246,0.16), rgba(34,211,238,0.16));
  --grad-text: linear-gradient(120deg, #7dd3fc 0%, #22d3ee 45%, #818cf8 100%);

  /* 文本 */
  --t-hi: #eaf2ff;
  --t-mid: #aab8d4;
  --t-dim: #6b7a9c;
  --t-faint: #45506e;

  /* 边框 / 发光 */
  --bd: rgba(120, 160, 255, 0.14);
  --bd-strong: rgba(120, 160, 255, 0.28);
  --bd-glow: rgba(59, 130, 246, 0.55);
  --glow-blue: 0 0 0 1px rgba(59,130,246,0.4), 0 8px 40px -8px rgba(59,130,246,0.5);
  --glow-soft: 0 0 60px -10px rgba(34, 211, 238, 0.35);

  /* 形状 */
  --r-sm: 10px;
  --r-md: 16px;
  --r-lg: 24px;
  --r-xl: 32px;

  /* 间距尺度 */
  --sp-1: 8px;
  --sp-2: 16px;
  --sp-3: 24px;
  --sp-4: 40px;
  --sp-5: 64px;
  --sp-6: 96px;
  --sp-7: 140px;

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

  /* 动效 */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --shadow-card: 0 12px 40px -16px rgba(0, 0, 0, 0.7);
  --maxw: 1200px;
}

/* ---------- Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-void);
  color: var(--t-mid);
  line-height: 1.7;
  font-size: 16px;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* 深空背景：网格 + 极光光晕 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(900px 600px at 12% -8%, rgba(59, 130, 246, 0.18), transparent 60%),
    radial-gradient(800px 600px at 92% 4%, rgba(34, 211, 238, 0.14), transparent 55%),
    radial-gradient(700px 700px at 50% 110%, rgba(99, 102, 241, 0.12), transparent 60%),
    var(--bg-void);
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(120, 160, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120, 160, 255, 0.04) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 30%, transparent 80%);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.25s var(--ease);
}
a:hover { color: var(--t-hi); }
img { max-width: 100%; display: block; }
ul { list-style: none; }

/* ---------- 布局容器 ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--sp-3);
}
.container-wide { max-width: 1320px; }

/* ---------- 导航 ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(6, 9, 18, 0.72);
  border-bottom: 1px solid var(--bd);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: var(--sp-3);
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  color: var(--t-hi);
  font-size: 18px;
  letter-spacing: 0.5px;
}
.brand .logo-mark {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: var(--grad-primary);
  display: grid;
  place-items: center;
  font-weight: 800;
  color: #04122b;
  box-shadow: var(--glow-blue);
  font-size: 17px;
}
.brand .logo-img {
  height: 30px;
  width: auto;
  display: block;
}
.footer .brand .logo-img {
  height: 44px;
}
.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.brand small {
  display: block;
  font-size: 11px;
  font-weight: 500;
  color: var(--t-dim);
  letter-spacing: 1px;
  margin-top: -2px;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-links a {
  padding: 8px 14px;
  border-radius: 10px;
  color: var(--t-mid);
  font-size: 14.5px;
  font-weight: 500;
}
.nav-links a:hover {
  color: var(--t-hi);
  background: var(--bg-card);
}
.nav-links a.active {
  color: var(--t-hi);
  background: var(--grad-soft);
  border: 1px solid var(--bd-strong);
}
.nav-cta { display: flex; align-items: center; gap: 12px; }
.lang-switch {
  font-size: 13px;
  color: var(--t-dim);
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid var(--bd);
}
.lang-switch:hover { color: var(--t-hi); border-color: var(--bd-strong); }

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  background: var(--bg-card);
  border: 1px solid var(--bd);
  border-radius: 10px;
  width: 42px; height: 42px;
  color: var(--t-hi);
  font-size: 20px;
  cursor: pointer;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.2s var(--ease), box-shadow 0.25s var(--ease),
    background 0.25s var(--ease);
  white-space: nowrap;
}
.btn-primary {
  background: var(--grad-primary);
  color: #04122b;
  box-shadow: var(--glow-blue);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 0 1px rgba(59,130,246,0.6), 0 14px 50px -10px rgba(34,211,238,0.6);
  color: #04122b;
}
.btn-ghost {
  background: var(--bg-card);
  border-color: var(--bd-strong);
  color: var(--t-hi);
}
.btn-ghost:hover {
  background: var(--bg-card-hover);
  border-color: var(--bd-glow);
  transform: translateY(-2px);
}
.btn-lg { padding: 16px 34px; font-size: 16px; }
.btn-sm { padding: 9px 18px; font-size: 13.5px; }

/* ---------- 章节 / 标题 ---------- */
.section { padding-block: var(--sp-6); position: relative; }
.section-tight { padding-block: var(--sp-5); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--c-cyan);
  padding: 6px 14px;
  border: 1px solid var(--bd-strong);
  border-radius: 999px;
  background: var(--bg-card);
  margin-bottom: var(--sp-2);
}
.eyebrow::before {
  content: "";
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--c-cyan); box-shadow: 0 0 10px var(--c-cyan);
}
.section-head { max-width: 720px; margin-bottom: var(--sp-4); }
.section-head h2 {
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.18;
  color: var(--t-hi);
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: var(--sp-2);
}
.section-head p { color: var(--t-mid); font-size: 17px; }
.grad-text {
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

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

.card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--bd);
  border-radius: var(--r-lg);
  padding: var(--sp-3);
  overflow: hidden;
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease),
    background 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(400px 200px at var(--mx, 50%) var(--my, 0%), rgba(59,130,246,0.12), transparent 60%);
  opacity: 0;
  transition: opacity 0.3s var(--ease);
  pointer-events: none;
}
.card:hover {
  transform: translateY(-4px);
  border-color: var(--bd-glow);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-card), var(--glow-soft);
}
.card:hover::before { opacity: 1; }

.card .icon {
  width: 52px; height: 52px;
  border-radius: 14px;
  display: grid; place-items: center;
  background: var(--grad-soft);
  border: 1px solid var(--bd-strong);
  font-size: 24px;
  margin-bottom: var(--sp-2);
}
.card h3 { color: var(--t-hi); font-size: 19px; margin-bottom: 10px; font-weight: 700; }
.card p { color: var(--t-mid); font-size: 14.5px; }
.card .link {
  display: inline-flex; align-items: center; gap: 6px;
  margin-top: var(--sp-2); color: var(--c-cyan); font-weight: 600; font-size: 14px;
}
.card .link:hover { gap: 10px; }

/* 标签 */
.tag {
  display: inline-block;
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 8px;
  background: var(--bg-card);
  border: 1px solid var(--bd);
  color: var(--t-mid);
  margin: 3px 3px 0 0;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding-top: var(--sp-6);
  padding-bottom: var(--sp-5);
  overflow: hidden;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: var(--sp-5);
  align-items: center;
}
.hero h1 {
  font-size: clamp(36px, 5.4vw, 62px);
  line-height: 1.08;
  color: var(--t-hi);
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: var(--sp-3);
}
.hero p.lead {
  font-size: 19px;
  color: var(--t-mid);
  max-width: 560px;
  margin-bottom: var(--sp-4);
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: var(--sp-4); }
.hero-stats {
  display: flex;
  gap: var(--sp-4);
  flex-wrap: wrap;
}
.stat .num {
  font-size: 30px; font-weight: 800; color: var(--t-hi);
  background: var(--grad-text); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stat .label { font-size: 13px; color: var(--t-dim); }

/* Hero 视觉面板 */
.hero-visual {
  position: relative;
  border-radius: var(--r-xl);
  border: 1px solid var(--bd-strong);
  background: linear-gradient(160deg, rgba(59,130,246,0.1), rgba(34,211,238,0.05));
  padding: var(--sp-3);
  box-shadow: var(--glow-soft);
  overflow: hidden;
}
.hero-visual::after {
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(circle at 70% 20%, rgba(34,211,238,0.25), transparent 55%);
  pointer-events: none;
}
.visual-card {
  position: relative;
  background: rgba(8, 13, 26, 0.7);
  border: 1px solid var(--bd);
  border-radius: var(--r-md);
  padding: 16px 18px;
  margin-bottom: 14px;
  display: flex; align-items: center; gap: 14px;
}
.visual-card .vc-icon {
  width: 42px; height: 42px; border-radius: 11px;
  background: var(--grad-soft); display: grid; place-items: center; font-size: 20px;
  border: 1px solid var(--bd-strong); flex: none;
}
.visual-card .vc-title { color: var(--t-hi); font-weight: 600; font-size: 15px; }
.visual-card .vc-desc { color: var(--t-dim); font-size: 12.5px; }

/* ---------- 信任条 / logos ---------- */
.trust-bar {
  border-block: 1px solid var(--bd);
  padding-block: var(--sp-3);
  display: flex; flex-wrap: wrap; align-items: center; gap: var(--sp-4);
  justify-content: space-between;
}
.trust-bar .tb-label { color: var(--t-dim); font-size: 13px; letter-spacing: 1px; }
.trust-bar .tb-items { display: flex; flex-wrap: wrap; gap: var(--sp-4); }
.trust-bar .tb-item { color: var(--t-mid); font-weight: 600; font-size: 15px; opacity: 0.85; }

/* ---------- 特性列表 / 步骤 ---------- */
.feature-row {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--sp-3);
}
.step {
  display: flex; gap: var(--sp-2); padding: var(--sp-3);
  background: var(--bg-card); border: 1px solid var(--bd); border-radius: var(--r-lg);
}
.step .step-no {
  flex: none; width: 40px; height: 40px; border-radius: 11px;
  background: var(--grad-primary); color: #04122b; font-weight: 800;
  display: grid; place-items: center; box-shadow: var(--glow-blue);
}
.step h4 { color: var(--t-hi); font-size: 16px; margin-bottom: 4px; }
.step p { color: var(--t-mid); font-size: 14px; }

/* ---------- 代码 / 终端块 ---------- */
.terminal {
  background: #05080f;
  border: 1px solid var(--bd-strong);
  border-radius: var(--r-md);
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 13.5px;
}
.terminal .t-bar {
  display: flex; align-items: center; gap: 7px;
  padding: 11px 16px; border-bottom: 1px solid var(--bd);
  background: rgba(255,255,255,0.02);
}
.terminal .dot { width: 11px; height: 11px; border-radius: 50%; }
.terminal .dot.r { background: #ff5f57; }
.terminal .dot.y { background: #febc2e; }
.terminal .dot.g { background: #28c840; }
.terminal .t-title { color: var(--t-dim); font-size: 12px; margin-left: 6px; }
.terminal pre { padding: 18px 20px; color: #c8d6f5; overflow-x: auto; line-height: 1.7; }
.terminal .c-key { color: #7dd3fc; }
.terminal .c-str { color: #8be9c0; }
.terminal .c-com { color: #5b6b8c; }
.terminal .c-fn { color: #c4a3ff; }

/* ---------- FAQ ---------- */
.faq-item {
  border: 1px solid var(--bd); border-radius: var(--r-md);
  background: var(--bg-card); margin-bottom: 12px; overflow: hidden;
}
.faq-item summary {
  cursor: pointer; padding: 18px 22px; color: var(--t-hi);
  font-weight: 600; font-size: 16px; list-style: none;
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+"; color: var(--c-cyan); font-size: 22px; font-weight: 400; transition: transform 0.25s var(--ease);
}
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item .faq-body { padding: 0 22px 20px; color: var(--t-mid); font-size: 14.5px; }

/* ---------- CTA 区块 ---------- */
.cta-band {
  position: relative;
  border-radius: var(--r-xl);
  border: 1px solid var(--bd-strong);
  background: linear-gradient(135deg, rgba(59,130,246,0.16), rgba(34,211,238,0.08));
  padding: var(--sp-5) var(--sp-4);
  text-align: center;
  overflow: hidden;
  box-shadow: var(--glow-soft);
}
.cta-band h2 { color: var(--t-hi); font-size: clamp(26px, 3.6vw, 38px); margin-bottom: var(--sp-2); font-weight: 800; }
.cta-band p { color: var(--t-mid); font-size: 17px; max-width: 620px; margin: 0 auto var(--sp-3); }
.cta-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ---------- 页脚 ---------- */
.footer {
  border-top: 1px solid var(--bd);
  padding-block: var(--sp-5) var(--sp-3);
  margin-top: var(--sp-6);
  background: rgba(6, 9, 18, 0.6);
}
.footer-grid {
  display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: var(--sp-4);
  margin-bottom: var(--sp-4);
}
.footer h4 { color: var(--t-hi); font-size: 14px; margin-bottom: var(--sp-2); letter-spacing: 0.5px; }
.footer a { display: block; color: var(--t-mid); font-size: 14px; padding: 5px 0; }
.footer a:hover { color: var(--c-cyan); }
.footer .brand-blurb { color: var(--t-dim); font-size: 14px; max-width: 320px; margin-top: 14px; }
.footer-bottom {
  border-top: 1px solid var(--bd);
  padding-top: var(--sp-3);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  color: var(--t-faint); font-size: 13px;
}
.footer-bottom a { color: var(--t-dim); display: inline; }

/* ---------- 动效 ---------- */
@keyframes floaty { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }
@keyframes glowPulse {
  0%,100% { box-shadow: 0 0 0 1px rgba(59,130,246,0.4), 0 8px 40px -8px rgba(59,130,246,0.5); }
  50% { box-shadow: 0 0 0 1px rgba(34,211,238,0.6), 0 8px 60px -6px rgba(34,211,238,0.7); }
}
.float { animation: floaty 6s ease-in-out infinite; }
.glow-pulse { animation: glowPulse 4s ease-in-out infinite; }

.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; gap: var(--sp-4); }
  .hero-visual { order: -1; }
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .feature-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .nav-links, .nav-cta .btn-ghost { display: none; }
  .nav-toggle { display: grid; place-items: center; }
  .nav-links.open {
    display: flex; flex-direction: column; align-items: stretch;
    position: absolute; top: 68px; left: 0; right: 0;
    background: rgba(6,9,18,0.96); border-bottom: 1px solid var(--bd); padding: var(--sp-2);
  }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .section { padding-block: var(--sp-5); }
  .hero { padding-top: var(--sp-5); }
}