:root {
  --bg-deep: #0b1220;
  --bg-card: #111827;
  --bg-card-hover: #1a2332;
  --bg-elevated: #162032;
  --border: rgba(148, 163, 184, 0.14);
  --text: #e5e7eb;
  --text-muted: #94a3b8;
  --primary: #22c55e;
  --primary-dark: #16a34a;
  --accent: #3b82f6;
  --accent-soft: rgba(59, 130, 246, 0.12);
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
  --radius: 16px;
  --radius-sm: 10px;
  --max-width: 1120px;
  --header-height: 72px;
}

*,
*::before,
*::after {
  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 right, rgba(34, 197, 94, 0.08), transparent 28%),
    radial-gradient(circle at 20% 20%, rgba(59, 130, 246, 0.08), transparent 24%),
    var(--bg-deep);
  line-height: 1.65;
}

img {
  max-width: 100%;
  display: block;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(14px);
  background: rgba(11, 18, 32, 0.82);
  border-bottom: 1px solid var(--border);
}

.nav {
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-logo {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  object-fit: cover;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

.brand-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.brand-text strong {
  font-size: 1rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.brand-text span {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-links a {
  padding: 10px 14px;
  border-radius: 999px;
  color: var(--text-muted);
  transition: color 0.2s ease, background 0.2s ease;
}

.nav-links a:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.05);
}

.nav-toggle {
  display: none;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  border-radius: 10px;
  padding: 8px 12px;
  cursor: pointer;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  font-weight: 600;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

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

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #052e16;
  box-shadow: 0 10px 30px rgba(34, 197, 94, 0.25);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  border: 1px solid var(--border);
}

.hero {
  padding: 72px 0 48px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 40px;
  align-items: center;
}

.hero-copy h1 {
  margin: 0 0 12px;
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 1.15;
}

.hero-copy .subtitle {
  margin: 0 0 18px;
  color: var(--text-muted);
  font-size: 1.05rem;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 24px;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.88rem;
}

.badge-accent {
  color: #86efac;
  border-color: rgba(34, 197, 94, 0.25);
  background: rgba(34, 197, 94, 0.08);
}

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

.hero-shot {
  position: relative;
}

.hero-shot::before {
  content: "";
  position: absolute;
  inset: -8%;
  background: radial-gradient(circle, rgba(34, 197, 94, 0.18), transparent 60%);
  filter: blur(24px);
  z-index: 0;
}

.hero-shot img {
  position: relative;
  z-index: 1;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.section {
  padding: 64px 0;
}

.section-header {
  margin-bottom: 32px;
}

.section-header h2 {
  margin: 0 0 10px;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
}

.section-header p {
  margin: 0;
  color: var(--text-muted);
  max-width: 720px;
}

.intro-card {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.02));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
}

.intro-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 1.02rem;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 22px;
  transition: background 0.2s ease, transform 0.2s ease;
}

.feature-card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

.feature-card h3 {
  margin: 0 0 10px;
  font-size: 1.05rem;
}

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

.screenshot-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.screenshot-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.screenshot-card img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  object-position: top center;
  background: #0f172a;
}

.screenshot-card figcaption {
  padding: 16px 18px 18px;
}

.screenshot-card h3 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.screenshot-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.download-section {
  background: linear-gradient(180deg, rgba(59, 130, 246, 0.08), rgba(59, 130, 246, 0.02));
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.download-panel {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 28px;
  align-items: stretch;
}

.download-meta,
.download-cards {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
}

.download-meta h2 {
  margin: 0 0 12px;
}

.download-meta ul {
  margin: 0;
  padding-left: 18px;
  color: var(--text-muted);
}

.download-meta li + li {
  margin-top: 8px;
}

.download-cards {
  display: grid;
  gap: 16px;
}

.download-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px;
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
}

.download-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.download-card h3 {
  margin: 0;
  font-size: 1.05rem;
}

.download-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.download-code {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: #93c5fd;
  font-size: 0.86rem;
}

.note-box {
  margin-top: 24px;
  padding: 18px 20px;
  border-radius: var(--radius-sm);
  border: 1px dashed rgba(148, 163, 184, 0.25);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-muted);
  font-size: 0.92rem;
}

.site-footer {
  padding: 28px 0 40px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.site-footer .container {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  justify-content: space-between;
  align-items: center;
}

@media (max-width: 960px) {
  .hero-grid,
  .download-panel,
  .feature-grid,
  .screenshot-grid {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 720px) {
  .nav-toggle {
    display: inline-flex;
  }

  .nav-links {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    padding: 12px 16px 16px;
    background: rgba(11, 18, 32, 0.96);
    border-bottom: 1px solid var(--border);
    display: none;
  }

  .nav-links.is-open {
    display: flex;
  }

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

  .hero {
    padding-top: 48px;
  }
}