:root {
  --bg-base: #fff9f2;
  --bg-soft: #fff4e7;
  --ink: #1a2f3f;
  --ink-muted: #476076;
  --line: rgba(26, 47, 63, 0.16);
  --card: rgba(255, 255, 255, 0.88);
  --sky: #1f79ff;
  --teal: #029789;
  --orange: #ff8a3d;
  --radius-lg: 22px;
  --radius-md: 14px;
  --shadow: 0 24px 50px rgba(17, 39, 57, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: radial-gradient(circle at 20% 12%, #ffe7cb 0%, transparent 42%),
    radial-gradient(circle at 82% 3%, #daf1ff 0%, transparent 38%),
    linear-gradient(180deg, var(--bg-base) 0%, #fffdf8 100%);
  font-family: "Noto Sans SC", "Microsoft YaHei", sans-serif;
  line-height: 1.65;
}

.ambient-bg {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(26, 47, 63, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(26, 47, 63, 0.04) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: radial-gradient(circle at 50% 25%, black 32%, transparent 90%);
  pointer-events: none;
  z-index: -1;
}

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

.site-header {
  width: min(1120px, 94vw);
  margin: 16px auto 0;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.9);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  position: sticky;
  top: 12px;
  backdrop-filter: blur(6px);
  box-shadow: 0 14px 30px rgba(30, 55, 77, 0.08);
  z-index: 10;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 0 8px;
}

.brand img {
  width: 34px;
  height: 34px;
  border-radius: 9px;
}

.brand span {
  font-family: "Space Grotesk", "Noto Sans SC", sans-serif;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.1px;
}

.top-nav {
  display: inline-flex;
  align-items: center;
  gap: 20px;
}

.top-nav a {
  color: var(--ink-muted);
  font-size: 14px;
  transition: color 0.2s ease;
}

.top-nav a:hover {
  color: var(--ink);
}

.header-cta {
  background: linear-gradient(115deg, var(--sky), var(--teal));
  color: #ffffff;
  font-size: 14px;
  font-weight: 600;
  border-radius: 999px;
  padding: 10px 16px;
  box-shadow: 0 10px 20px rgba(31, 121, 255, 0.24);
}

main {
  width: min(1120px, 92vw);
  margin: 24px auto 90px;
}

.section {
  margin-top: 72px;
}

.hero {
  margin-top: 34px;
  display: grid;
  grid-template-columns: minmax(320px, 1.1fr) minmax(280px, 0.9fr);
  gap: 28px;
  align-items: stretch;
}

.hero-copy {
  padding: 18px 4px;
}

.eyebrow {
  margin: 0;
  color: var(--teal);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.13em;
}

.hero h1 {
  margin: 14px 0 0;
  font-family: "Space Grotesk", "Noto Sans SC", sans-serif;
  font-size: clamp(32px, 4.2vw, 56px);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.hero-desc {
  margin: 18px 0 0;
  color: var(--ink-muted);
  max-width: 52ch;
  font-size: 17px;
}

.hero-actions {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  padding: 0 22px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: linear-gradient(120deg, var(--orange), #ff6e47);
  color: #ffffff;
  box-shadow: 0 12px 24px rgba(255, 125, 73, 0.28);
}

.btn-secondary {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.78);
  color: var(--ink);
}

.quick-facts {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.quick-facts li {
  border: 1px solid var(--line);
  border-radius: 13px;
  background: rgba(255, 255, 255, 0.64);
  padding: 11px 12px;
  min-width: 148px;
}

.quick-facts strong {
  display: block;
  font-size: 14px;
}

.quick-facts span {
  color: var(--ink-muted);
  font-size: 12px;
}

.hero-preview {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--card);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.preview-head {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 52px;
  padding: 0 16px;
  border-bottom: 1px solid var(--line);
  background: #fffdf8;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.dot-red {
  background: #ff6a55;
}

.dot-yellow {
  background: #ffcc4f;
}

.dot-green {
  background: #2fcf8e;
}

.preview-head p {
  margin: 0 0 0 6px;
  color: var(--ink-muted);
  font-size: 13px;
}

.preview-body {
  padding: 16px;
  display: grid;
  gap: 10px;
}

.preview-body p {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #ffffff;
  padding: 10px 12px;
  font-size: 14px;
}

.tag {
  display: inline-block;
  margin-right: 8px;
  padding: 2px 8px;
  border-radius: 999px;
  background: #e9f4ff;
  color: #0f4e9a;
  font-size: 12px;
  font-weight: 700;
}

.section-title p {
  margin: 0;
  color: var(--teal);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.section-title h2 {
  margin: 8px 0 0;
  font-family: "Space Grotesk", "Noto Sans SC", sans-serif;
  font-size: clamp(28px, 3.2vw, 42px);
  line-height: 1.15;
}

.feature-grid {
  margin-top: 24px;
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.feature-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--card);
  padding: 18px;
  min-height: 180px;
  position: relative;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.feature-card::before {
  content: "";
  position: absolute;
  left: 18px;
  right: 18px;
  top: 0;
  height: 3px;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--sky), var(--orange));
}

.feature-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 28px rgba(31, 47, 63, 0.12);
}

.feature-card h3 {
  margin: 10px 0 8px;
  font-size: 19px;
}

.feature-card p {
  margin: 0;
  color: var(--ink-muted);
}

.flow-grid {
  margin-top: 24px;
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.flow-step {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: #ffffff;
  padding: 18px;
}

.step-no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  height: 30px;
  border-radius: 999px;
  background: #e8fff5;
  color: #0f7b63;
  font-size: 14px;
  font-weight: 700;
}

.flow-step h3 {
  margin: 14px 0 8px;
  font-size: 20px;
}

.flow-step p {
  margin: 0;
  color: var(--ink-muted);
}

.privacy-grid {
  margin-top: 24px;
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.privacy-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: linear-gradient(170deg, rgba(255, 255, 255, 0.96), rgba(239, 248, 255, 0.72));
  padding: 18px;
}

.privacy-card h3 {
  margin: 0;
  font-size: 19px;
}

.privacy-card p {
  margin: 10px 0 0;
  color: var(--ink-muted);
}

.install-grid {
  margin-top: 24px;
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.install-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: #ffffff;
  padding: 18px;
}

.install-card h3 {
  margin: 0 0 10px;
  font-size: 19px;
}

pre {
  margin: 0;
  padding: 12px;
  border-radius: 12px;
  border: 1px solid rgba(22, 33, 46, 0.15);
  background: #1d2935;
  color: #f5fcff;
  overflow-x: auto;
}

code {
  font-family: "Cascadia Code", "Consolas", monospace;
  font-size: 13px;
}

.install-card p {
  margin: 10px 0 0;
  color: var(--ink-muted);
}

.install-card ol {
  margin: 0;
  padding-left: 18px;
  color: var(--ink-muted);
}

.install-card li + li {
  margin-top: 7px;
}

.deploy-note {
  margin-top: 14px;
  color: var(--ink-muted);
  font-size: 14px;
}

.faq-list {
  margin-top: 24px;
  display: grid;
  gap: 10px;
}

.faq-item {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.88);
  padding: 12px 14px;
}

.faq-item summary {
  cursor: pointer;
  font-weight: 700;
}

.faq-item p {
  margin: 8px 0 0;
  color: var(--ink-muted);
}

.site-footer {
  width: min(1120px, 92vw);
  margin: 0 auto 24px;
  border-top: 1px solid var(--line);
  padding-top: 16px;
  color: var(--ink-muted);
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.footer-links {
  display: inline-flex;
  align-items: center;
  gap: 16px;
}

.footer-links a:hover {
  color: var(--ink);
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1024px) {
  .top-nav {
    display: none;
  }

  .hero {
    grid-template-columns: 1fr;
  }

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

  .flow-grid,
  .privacy-grid,
  .install-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 680px) {
  .site-header {
    width: min(1120px, 96vw);
    border-radius: 18px;
    padding: 12px;
  }

  .brand span {
    font-size: 18px;
  }

  .header-cta {
    font-size: 13px;
    padding: 9px 14px;
  }

  main {
    width: min(1120px, 94vw);
    margin-top: 12px;
  }

  .section {
    margin-top: 56px;
  }

  .hero h1 {
    font-size: clamp(30px, 10vw, 44px);
  }

  .hero-desc {
    font-size: 16px;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .site-footer {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  * {
    animation: none !important;
    transition: none !important;
  }
}