/* === Reset & Base === */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #f5f5f7;
  --bg-card: rgba(255, 255, 255, 0.82);
  --text: #1d1d1f;
  --text-secondary: #6e6e73;
  --accent: #0071e3;
  --accent-hover: #0077ed;
  --accent-soft: #d9e9ff;
  --border: rgba(29, 29, 31, 0.10);
  --radius: 18px;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.05), 0 14px 34px rgba(0, 57, 120, 0.08);
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(0, 113, 227, 0.10), transparent 32%),
    radial-gradient(circle at top right, rgba(118, 118, 128, 0.10), transparent 26%),
    var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

h2 {
  font-size: 2rem;
  font-weight: 600;
  text-align: center;
  margin-bottom: 48px;
  letter-spacing: -0.02em;
}

/* === Hero === */
.hero {
  text-align: center;
  padding: 108px 24px 72px;
}

.hero-icon {
  width: 80px;
  height: 80px;
  border-radius: 20px;
  margin-bottom: 24px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.08);
}

.hero h1 {
  font-size: clamp(3rem, 6vw, 4.6rem);
  font-weight: 760;
  letter-spacing: -0.03em;
  margin-bottom: 14px;
}

.hero-tagline {
  font-size: clamp(1.2rem, 2.5vw, 1.65rem);
  color: color-mix(in srgb, var(--text) 72%, var(--text-secondary));
  margin-bottom: 14px;
}

.hero-desc {
  max-width: 640px;
  margin: 0 auto 34px;
  color: var(--text-secondary);
  font-size: 1.03rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  align-items: center;
  margin-bottom: 22px;
}

.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: var(--accent);
  color: #fffaf5;
  border-radius: 999px;
  font-size: 1.05rem;
  font-weight: 600;
  text-decoration: none;
  box-shadow: 0 10px 24px rgba(0, 113, 227, 0.22);
  transition: background 0.15s, transform 0.15s, box-shadow 0.15s;
}

.btn-download:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 14px 26px rgba(0, 113, 227, 0.28);
}

.btn-download.loading {
  opacity: 0.7;
  pointer-events: none;
}

.btn-download.error {
  background: #888;
}

.btn-icon {
  font-size: 1.1rem;
}

.btn-gh {
  display: inline-flex;
  align-items: center;
  padding: 14px 28px;
  background: var(--bg-card);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 1.05rem;
  font-weight: 500;
  text-decoration: none;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: border-color 0.15s, background 0.15s, transform 0.15s;
}

.btn-gh:hover {
  border-color: rgba(0,0,0,0.18);
  background: rgba(245, 249, 255, 0.95);
  transform: translateY(-1px);
}

.hero-platform {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

/* === Screenshots === */
.screenshots {
  padding: 70px 0 82px;
}

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

.screenshot-grid img {
  width: 100%;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform 0.2s;
}

.screenshot-grid img:hover {
  transform: translateY(-4px);
}

/* === Features === */
.features {
  padding: 8px 0 90px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.feature-card {
  background: var(--bg-card);
  border: none;
  border-radius: var(--radius);
  padding: 28px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: transform 0.15s, box-shadow 0.15s;
}

.feature-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.feature-icon {
  width: 32px;
  height: 32px;
  margin-bottom: 14px;
  color: var(--accent);
}

.feature-icon svg {
  display: block;
  width: 100%;
  height: 100%;
}

.feature-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 6px;
}

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

.feature-note {
  max-width: 760px;
  margin: 28px auto 0;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.94rem;
}

/* === Footer === */
.footer {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-secondary);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
}

.footer a {
  color: var(--accent);
  text-decoration: none;
}

.footer a:hover {
  text-decoration: underline;
}

.footer-version {
  margin-top: 4px;
  opacity: 0.7;
}

/* === Responsive === */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.2rem;
  }
  .feature-grid {
    grid-template-columns: 1fr;
  }
  .screenshot-grid {
    grid-template-columns: 1fr;
  }
  .hero-actions {
    flex-direction: column;
  }
}