* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #FBFBFB;
  --bg-card: #F5F5F5;
  --text: #1A1A1A;
  --text-muted: #6B7280;
  --accent: #2563EB;
  --accent-hover: #1D4ED8;
  --border: #E5E7EB;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.header {
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.03em;
}

.header nav {
  display: flex;
  gap: 28px;
}

.header nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
}

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

/* Hero */
.hero {
  padding: 80px 0 100px;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

@media (max-width: 900px) {
  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

.hero h1 {
  font-size: 48px;
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.1;
  margin-bottom: 20px;
}

.hero-tagline {
  font-size: 18px;
  color: var(--text-muted);
  margin-bottom: 32px;
  max-width: 420px;
}

@media (max-width: 900px) {
  .hero h1 { font-size: 36px; }
  .hero-tagline { margin-left: auto; margin-right: auto; }
}

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

@media (max-width: 900px) {
  .hero-actions { justify-content: center; }
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 600;
  border-radius: 8px;
  text-decoration: none;
  transition: all 0.15s;
  font-family: inherit;
  border: none;
  cursor: pointer;
}

.btn-primary {
  background: var(--text);
  color: white;
}

.btn-primary:hover {
  background: #333;
}

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

.btn-ghost:hover {
  color: var(--text);
  border-color: var(--text);
}

.btn-large {
  padding: 14px 28px;
  font-size: 16px;
}

.app-mockup {
  background: var(--bg-card);
  border-radius: 12px;
  padding: 12px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.06);
}

.app-mockup img {
  width: 100%;
  border-radius: 8px;
  display: block;
}

/* Placeholder if no screenshot yet */
.app-mockup:empty::before,
.app-mockup img[src="app-screenshot.png"]:not([src]) {
  content: '';
  display: block;
  width: 100%;
  aspect-ratio: 16/10;
  background: linear-gradient(135deg, #E5E7EB 0%, #F3F4F6 100%);
  border-radius: 8px;
}

/* Features */
.features {
  padding: 80px 0;
  background: #FAFAFA;
}

.features h2 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 48px;
  text-align: center;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

@media (max-width: 900px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 500px) {
  .features-grid {
    grid-template-columns: 1fr;
  }
}

.feature-card {
  background: white;
  padding: 28px;
  border-radius: 12px;
  border: 1px solid var(--border);
}

.feature-icon {
  font-size: 32px;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 14px;
  color: var(--text-muted);
}

/* Download */
.download {
  padding: 80px 0 100px;
}

.download h2 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 12px;
  text-align: center;
}

.download-intro {
  text-align: center;
  color: var(--text-muted);
  margin-bottom: 32px;
}

.download-card {
  max-width: 480px;
  margin: 0 auto;
  background: white;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  text-align: center;
}

.download-info {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 20px;
}

.download-label {
  font-weight: 600;
}

.download-version {
  color: var(--text-muted);
  font-size: 14px;
}

.download-note {
  margin-top: 20px;
  font-size: 12px;
  color: var(--text-muted);
}

.download-note code {
  background: var(--bg-card);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 11px;
}

/* Footer */
.footer {
  padding: 32px 0;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer p {
  font-size: 14px;
  color: var(--text-muted);
}