:root {
  --bg: #05080d;
  --bg-alt: #0a1018;
  --surface: #101826;
  --text: #e8eef7;
  --text-muted: #8b9cb3;
  --accent: #3b9eff;
  --accent-2: #6c5ce7;
  --cyan: #22d3ee;
  --gold: #c9a45c;
  --accent-soft: rgba(59, 158, 255, 0.14);
  --border: rgba(255, 255, 255, 0.08);
  --radius: 16px;
  --max-width: 1120px;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Consolas, monospace;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

.container {
  width: min(100% - 2rem, var(--max-width));
  margin-inline: auto;
}

.page-grid {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(59, 158, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59, 158, 255, 0.045) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse at 70% 0%, #000 20%, transparent 72%);
}

.site-header,
main,
.site-footer {
  position: relative;
  z-index: 1;
}

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(16px);
  background: rgba(5, 8, 13, 0.78);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 0;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: 0.02em;
}

.nav {
  display: flex;
  gap: 1.4rem;
  font-size: 0.92rem;
  color: var(--text-muted);
}

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

/* Hero */

.hero {
  padding: 4.8rem 0 5.2rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 3rem;
  align-items: center;
}

.eyebrow {
  margin: 0 0 0.9rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.hero h1 {
  margin: 0 0 1.1rem;
  font-size: clamp(2.1rem, 5vw, 3.35rem);
  line-height: 1.16;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.hero-desc {
  margin: 0 0 1.7rem;
  max-width: 36rem;
  font-size: 1.02rem;
  color: var(--text-muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.82rem 1.4rem;
  border-radius: 999px;
  font-size: 0.94rem;
  font-weight: 600;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

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

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  box-shadow: 0 10px 28px rgba(59, 158, 255, 0.22);
}

.btn-ghost {
  border: 1px solid var(--border);
  color: var(--text);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin: 2.2rem 0 0;
  max-width: 28rem;
}

.hero-stats div {
  padding-top: 0.85rem;
  border-top: 1px solid var(--border);
}

.hero-stats dt {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.hero-stats dd {
  margin: 0.2rem 0 0;
  font-size: 1.15rem;
  font-weight: 700;
}

/* Lab mock */

.lab-panel {
  border-radius: calc(var(--radius) + 4px);
  background: linear-gradient(180deg, #141d2c, #0c131e);
  border: 1px solid rgba(34, 211, 238, 0.18);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.45), 0 0 80px rgba(59, 158, 255, 0.08);
  overflow: hidden;
}

.lab-meta,
.lab-log {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.85rem 1.1rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.lab-meta {
  border-bottom: 1px solid var(--border);
}

.lab-dot {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: #22d3ee;
  box-shadow: 0 0 10px #22d3ee;
}

.lab-status {
  margin-left: auto;
  color: #2dd4a8;
}

.diff-stage {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 0.9rem;
  align-items: center;
  padding: 1.35rem 1.15rem;
}

.diff-frame span {
  display: block;
  margin-top: 0.45rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  text-align: center;
}

.diff-img {
  aspect-ratio: 4 / 3;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.diff-img.a {
  background:
    linear-gradient(135deg, rgba(59, 158, 255, 0.35), transparent 55%),
    repeating-linear-gradient(90deg, #1a2740 0 8px, #152033 8px 16px);
}

.diff-img.b {
  background:
    linear-gradient(215deg, rgba(108, 92, 231, 0.4), transparent 50%),
    repeating-linear-gradient(90deg, #1a2740 0 8px, #152033 8px 16px);
}

.diff-meter {
  text-align: center;
  min-width: 4.5rem;
}

.diff-meter p {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--text-muted);
}

.diff-meter strong {
  display: block;
  margin: 0.15rem 0 0.45rem;
  font-size: 1.35rem;
  color: var(--cyan);
}

.diff-bar {
  width: 3.4rem;
  height: 4px;
  margin-inline: auto;
  border-radius: 99px;
  background: rgba(255, 255, 255, 0.08);
  overflow: hidden;
}

.diff-bar i {
  display: block;
  width: 87%;
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--cyan));
}

.lab-log {
  justify-content: space-between;
  border-top: 1px solid var(--border);
}

/* Sections */

.section {
  padding: 4.4rem 0;
}

.section-alt {
  background: linear-gradient(180deg, rgba(10, 16, 24, 0.92), rgba(10, 16, 24, 0.7));
  border-block: 1px solid var(--border);
}

.section-kicker {
  margin: 0 0 0.55rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  text-align: center;
}

.section-title {
  margin: 0 0 0.75rem;
  font-size: 1.9rem;
  text-align: center;
  font-weight: 700;
}

.section-title.left {
  text-align: left;
}

.section-lead {
  margin: 0 auto 2.2rem;
  max-width: 38rem;
  text-align: center;
  color: var(--text-muted);
}

/* Products */

.product-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
}

.product-card {
  padding: 1.7rem;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
}

.product-tag {
  display: inline-block;
  margin-bottom: 0.9rem;
  padding: 0.22rem 0.65rem;
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  background: var(--accent-soft);
  color: var(--accent);
}

.product-tag.gold {
  background: rgba(201, 164, 92, 0.14);
  color: var(--gold);
}

.product-card h3 {
  margin: 0 0 0.7rem;
  font-size: 1.4rem;
}

.product-card p {
  margin: 0 0 1rem;
  color: var(--text-muted);
  font-size: 0.96rem;
}

.product-points {
  margin: 0 0 1.15rem;
  padding-left: 1.15rem;
  font-size: 0.92rem;
}

.product-points li + li {
  margin-top: 0.35rem;
}

.product-note {
  margin: 0 !important;
  font-family: var(--mono);
  font-size: 0.8rem !important;
  color: var(--text-muted);
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-weight: 600;
  color: var(--gold);
}

.link-arrow::after {
  content: "→";
  transition: transform 0.15s ease;
}

.link-arrow:hover::after {
  transform: translateX(3px);
}

/* Values */

.value-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.1rem;
  margin-top: 2rem;
}

.value-card {
  padding: 1.4rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: rgba(16, 24, 38, 0.55);
}

.value-index {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--cyan);
}

.value-card h3 {
  margin: 0.55rem 0 0.5rem;
  font-size: 1.12rem;
}

.value-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.94rem;
}

/* Footer */

.site-footer {
  padding: 2rem 0 2.4rem;
  border-top: 1px solid var(--border);
  background: #04070b;
}

.footer-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem 1.5rem;
}

.footer-brand {
  margin: 0;
  font-weight: 600;
}

.footer-links {
  display: flex;
  gap: 1.25rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

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

.footer-email {
  margin: 0.85rem 0 0;
  font-size: 0.9rem;
}

.footer-email a {
  color: var(--text-muted);
}

.footer-email a:hover {
  color: var(--text);
}

.footer-icp {
  margin: 1rem 0 0.45rem;
  font-size: 0.88rem;
}

.footer-icp a {
  color: var(--text-muted);
}

.footer-icp a:hover {
  color: var(--text);
  text-decoration: underline;
}

.footer-copy {
  margin: 0;
  font-size: 0.84rem;
  color: var(--text-muted);
}

@media (max-width: 860px) {
  .hero-grid,
  .product-grid,
  .value-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 2.6rem;
  }

  .hero-visual {
    order: -1;
  }
}

@media (max-width: 640px) {
  .nav {
    gap: 0.85rem;
    font-size: 0.82rem;
  }

  .hero-stats {
    max-width: none;
  }

  .diff-stage {
    grid-template-columns: 1fr;
    justify-items: center;
  }

  .diff-meter {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    min-width: 0;
  }

  .diff-meter strong {
    margin: 0;
  }
}