:root {
  --bg: #f6f1ea;
  --bg-strong: #f0e5d6;
  --ink: #1c1a17;
  --muted: #5f5a52;
  --accent: #d97745;
  --accent-2: #2f6f6d;
  --card: #ffffff;
  --line: rgba(28, 26, 23, 0.12);
  --shadow: 0 24px 60px rgba(28, 26, 23, 0.15);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Noto Sans SC", "Source Han Sans SC", "Noto Sans CJK SC", sans-serif;
  color: var(--ink);
  background: radial-gradient(circle at top, #fffaf4 0%, var(--bg) 45%, #efe3d1 100%);
  overflow-x: hidden;
}

.bg-orbit {
  position: fixed;
  inset: -20% 10% auto auto;
  width: 520px;
  height: 520px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(47, 111, 109, 0.28), rgba(47, 111, 109, 0));
  filter: blur(6px);
  z-index: 0;
}

.orbit-2 {
  inset: auto auto -25% -15%;
  width: 620px;
  height: 620px;
  background: radial-gradient(circle, rgba(217, 119, 69, 0.22), rgba(217, 119, 69, 0));
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(16px);
  background: rgba(246, 241, 234, 0.75);
  border-bottom: 1px solid rgba(28, 26, 23, 0.08);
}

.nav {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

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

.brand img {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  box-shadow: var(--shadow);
}

.brand-title {
  font-family: "Noto Serif SC", "Source Han Serif SC", serif;
  font-size: 20px;
  letter-spacing: 0.08em;
}

.brand-subtitle {
  font-size: 12px;
  color: var(--muted);
}

.nav-links {
  display: flex;
  gap: 20px;
  font-size: 14px;
}

.nav-links a,
.footer-links a {
  text-decoration: none;
  color: var(--muted);
  transition: color 0.2s ease;
}

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

.nav-cta,
.primary,
.ghost {
  border-radius: 999px;
  padding: 10px 20px;
  font-size: 14px;
  border: none;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.nav-cta,
.primary {
  background: var(--ink);
  color: #fffaf4;
  box-shadow: 0 12px 28px rgba(28, 26, 23, 0.2);
}

.nav-cta:hover,
.primary:hover {
  transform: translateY(-2px);
}

.ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line);
}

.ghost:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: 90px 24px 60px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 48px;
  position: relative;
  z-index: 1;
}

.eyebrow {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--muted);
  margin-bottom: 12px;
}

.hero h1 {
  font-family: "Noto Serif SC", "Source Han Serif SC", serif;
  font-size: 46px;
  line-height: 1.2;
  margin: 0 0 16px;
}

.hero-highlight {
  color: var(--accent-2);
}

.hero-desc {
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin: 24px 0;
  flex-wrap: wrap;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 24px;
}

.metric-value {
  font-size: 18px;
  font-weight: 600;
}

.metric-label {
  font-size: 13px;
  color: var(--muted);
}

.hero-card {
  background: var(--card);
  border-radius: 28px;
  padding: 24px;
  box-shadow: var(--shadow);
  border: 1px solid rgba(28, 26, 23, 0.08);
  display: flex;
  flex-direction: column;
  gap: 20px;
  animation: float 8s ease-in-out infinite;
}

.hero-card-top {
  display: flex;
  align-items: center;
  gap: 16px;
}

.hero-card-top img {
  width: 60px;
  height: 60px;
  border-radius: 16px;
  background: #fff;
  box-shadow: 0 10px 24px rgba(28, 26, 23, 0.15);
}

.card-title {
  font-size: 18px;
  font-weight: 600;
}

.card-subtitle {
  font-size: 13px;
  color: var(--muted);
}

.hero-reader {
  background: linear-gradient(140deg, #fff5e6, #f4ede2);
  border-radius: 18px;
  padding: 16px;
  display: grid;
  gap: 10px;
}

.reader-title {
  font-weight: 600;
  color: var(--accent);
}

.reader-line {
  height: 10px;
  background: rgba(28, 26, 23, 0.08);
  border-radius: 999px;
}

.reader-line.short {
  width: 60%;
}

.hero-card-foot {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.badge {
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(47, 111, 109, 0.1);
  color: var(--accent-2);
  font-size: 12px;
  font-weight: 500;
}

.section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 64px 24px;
  position: relative;
  z-index: 1;
}

.section-head {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 32px;
}

.section h2 {
  font-family: "Noto Serif SC", "Source Han Serif SC", serif;
  font-size: 32px;
  margin: 0;
}

.section p {
  color: var(--muted);
  margin: 0;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.card {
  padding: 22px;
  border-radius: 20px;
  background: var(--card);
  border: 1px solid rgba(28, 26, 23, 0.08);
  box-shadow: 0 16px 36px rgba(28, 26, 23, 0.08);
}

.card h3 {
  margin: 0 0 10px;
  font-size: 18px;
}

.card p {
  line-height: 1.7;
}

.split {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.panel {
  padding: 24px;
  border-radius: 22px;
  background: var(--card);
  border: 1px solid rgba(28, 26, 23, 0.08);
}

.panel.muted {
  background: rgba(255, 255, 255, 0.6);
}

.panel ul {
  padding-left: 18px;
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.timeline {
  display: grid;
  gap: 24px;
}

.timeline-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  align-items: flex-start;
}

.timeline-dot {
  width: 14px;
  height: 14px;
  margin-top: 6px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 0 6px rgba(217, 119, 69, 0.2);
}

.timeline-item h3 {
  margin: 0 0 6px;
}

.timeline-item p {
  margin: 0;
  color: var(--muted);
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.download-card {
  padding: 24px;
  border-radius: 22px;
  background: var(--card);
  border: 1px solid rgba(28, 26, 23, 0.08);
  display: grid;
  gap: 12px;
}

.note {
  margin-top: 24px;
  padding: 16px 20px;
  border-radius: 16px;
  background: rgba(47, 111, 109, 0.08);
  color: var(--muted);
}

.site-footer {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 24px 48px;
  border-top: 1px solid rgba(28, 26, 23, 0.08);
  display: flex;
  justify-content: space-between;
  gap: 16px;
}

.footer-title {
  font-weight: 600;
  margin-bottom: 6px;
}

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

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

@keyframes float {
  0% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-10px);
  }
  100% {
    transform: translateY(0px);
  }
}

@media (max-width: 1024px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .nav-links {
    display: none;
  }
}

@media (max-width: 768px) {
  .hero h1 {
    font-size: 36px;
  }

  .hero-metrics,
  .grid-3,
  .split,
  .download-grid {
    grid-template-columns: 1fr;
  }

  .site-footer {
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}