:root {
  --bg: #f7f4ed;
  --surface: #fffdf8;
  --surface-strong: #ffffff;
  --text: #1d232f;
  --muted: #5d6674;
  --line: #e8dcc8;
  --primary: #c95d2e;
  --primary-dark: #9f431d;
  --accent: #1f6f78;
  --shadow: 0 18px 48px rgba(34, 35, 37, 0.08);
  --radius: 22px;
  --container: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(201, 93, 46, 0.12), transparent 28%),
    radial-gradient(circle at top right, rgba(31, 111, 120, 0.14), transparent 22%),
    linear-gradient(180deg, #fbf7ef 0%, #f7f4ed 100%);
  line-height: 1.65;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: 18px;
}

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

.container {
  width: min(var(--container), calc(100% - 32px));
  margin: 0 auto;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
}

.skip-link:focus {
  left: 16px;
  top: 16px;
  z-index: 999;
  background: #fff;
  padding: 10px 14px;
  border-radius: 999px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  background: rgba(251, 247, 239, 0.84);
  border-bottom: 1px solid rgba(232, 220, 200, 0.85);
}

.topbar,
.footer-grid,
.hero-grid,
.split-grid {
  display: grid;
  gap: 24px;
}

.topbar {
  grid-template-columns: auto 1fr auto;
  align-items: center;
  padding: 16px 0;
}

.brand {
  display: inline-flex;
  gap: 12px;
  align-items: center;
  font-weight: 800;
  font-size: 1.2rem;
}

.main-nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 22px;
}

.main-nav a {
  color: var(--muted);
  font-weight: 600;
}

.main-nav a[aria-current="page"] {
  color: var(--text);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 999px;
  font-weight: 700;
  transition: transform 0.2s ease, background 0.2s ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
}

.button-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--primary) 0%, #df7a3b 100%);
}

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

.hero,
.section {
  padding: 72px 0;
}

.hero-grid,
.split-grid {
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
}

.hero-compact {
  padding-bottom: 36px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.82rem;
}

h1,
h2,
h3,
strong {
  line-height: 1.15;
}

h1 {
  margin: 0;
  font-size: clamp(2.4rem, 5vw, 4.5rem);
}

h2 {
  margin: 0 0 16px;
  font-size: clamp(1.8rem, 3.5vw, 3rem);
}

h3 {
  margin: 0 0 12px;
  font-size: 1.25rem;
}

.lead,
.section-head p,
.copy-panel p,
.faq-item p,
.download-card p {
  color: var(--muted);
}

.hero-actions,
.meta-list,
.feature-grid,
.stats-grid,
.download-grid,
.faq-list {
  display: grid;
  gap: 18px;
}

.hero-actions {
  grid-template-columns: repeat(2, max-content);
  margin: 30px 0 18px;
}

.meta-list {
  grid-template-columns: repeat(4, max-content);
  list-style: none;
  padding: 0;
  margin: 0;
}

.meta-list li {
  background: rgba(255, 255, 255, 0.72);
  padding: 8px 14px;
  border-radius: 999px;
  color: var(--muted);
  font-weight: 700;
}

.card {
  background: rgba(255, 255, 255, 0.84);
  border: 1px solid rgba(232, 220, 200, 0.85);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero-visual,
.visual-panel,
.stacked-card {
  padding: 16px;
}

.section-head {
  max-width: 760px;
  margin-bottom: 30px;
}

.feature-grid,
.stats-grid,
.download-grid,
.faq-list {
  grid-template-columns: repeat(3, 1fr);
}

.feature-card,
.stat-card,
.download-card,
.faq-item {
  padding: 28px;
}

.alt-section {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.45), rgba(255, 255, 255, 0.15));
}

.check-list,
.download-card ul {
  margin: 20px 0 0;
  padding-left: 18px;
  color: var(--muted);
}

.highlight-section {
  background: linear-gradient(135deg, rgba(31, 111, 120, 0.08), rgba(201, 93, 46, 0.08));
}

.reverse {
  grid-template-columns: 0.92fr 1.08fr;
}

.stacked-card {
  position: relative;
}

.floating-note {
  position: absolute;
  right: 22px;
  bottom: 22px;
  display: grid;
  gap: 4px;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px 16px;
}

.site-footer {
  border-top: 1px solid rgba(232, 220, 200, 0.85);
  padding: 28px 0 44px;
}

.footer-grid {
  grid-template-columns: 1fr auto;
  align-items: center;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  color: var(--muted);
}

@media (max-width: 960px) {
  .topbar,
  .hero-grid,
  .split-grid,
  .footer-grid,
  .feature-grid,
  .stats-grid,
  .download-grid,
  .faq-list {
    grid-template-columns: 1fr;
  }

  .main-nav {
    justify-content: flex-start;
  }

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

  .hero-actions,
  .meta-list {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .hero,
  .section {
    padding: 52px 0;
  }

  .hero-actions,
  .meta-list {
    grid-template-columns: 1fr;
  }

  .button {
    width: 100%;
  }
}