/* ===== NutriApp - GitHub Pages Styles ===== */
:root {
  --primary: #2563EB;
  --primary-dark: #1E40AF;
  --primary-light: #60A5FA;
  --accent: #00BCD4;
  --bg: #FFFFFF;
  --bg-alt: #EFF6FF;
  --text: #212121;
  --text-light: #616161;
  --text-on-primary: #FFFFFF;
  --card-bg: #FFFFFF;
  --border: #E0E0E0;
  --shadow: 0 2px 12px rgba(0,0,0,0.08);
  --radius: 12px;
  --max-width: 1100px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* ===== Navigation ===== */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
}
.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
}
.nav-logo .logo-img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  object-fit: contain;
}
.nav-links { display: flex; gap: 24px; list-style: none; }
.nav-links a {
  text-decoration: none;
  color: var(--text-light);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--primary); }

/* ===== Hero Section ===== */
.hero {
  padding: 80px 24px 60px;
  text-align: center;
  background: linear-gradient(180deg, var(--bg-alt) 0%, var(--bg) 100%);
}
.hero-badge {
  display: inline-block;
  background: var(--primary-light);
  color: var(--text-on-primary);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 24px;
  letter-spacing: 0.5px;
}
.hero h1 {
  font-size: 3rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 16px;
  letter-spacing: -1px;
}
.hero h1 span { color: var(--primary); }
.hero p {
  font-size: 1.2rem;
  color: var(--text-light);
  max-width: 600px;
  margin: 0 auto 36px;
}
.hero-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  transition: transform 0.15s, box-shadow 0.15s;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 4px 20px rgba(0,0,0,0.15); }
.btn-primary { background: var(--primary); color: var(--text-on-primary); }
.btn-outline { border: 2px solid var(--primary); color: var(--primary); }
.btn-store {
  background: #000;
  color: #fff;
  padding: 10px 24px;
  border-radius: 10px;
}
.btn-store:hover { background: #1a1a1a; }

/* ===== Features ===== */
.features {
  padding: 80px 24px;
  max-width: var(--max-width);
  margin: 0 auto;
}
.features h2 {
  text-align: center;
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 48px;
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
}
.feature-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: transform 0.2s, box-shadow 0.2s;
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 20px;
}
.feature-icon.blue { background: #DBEAFE; color: var(--primary); }
.feature-icon.cyan { background: #E0F2F1; color: #00BCD4; }
.feature-icon.indigo { background: #E8EAF6; color: #3F51B5; }
.feature-icon.sky { background: #E1F5FE; color: #0288D1; }
.feature-icon.violet { background: #F3E5F5; color: #7B1FA2; }
.feature-icon.red { background: #FFEBEE; color: #C62828; }
.feature-card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 8px; }
.feature-card p { color: var(--text-light); font-size: 0.95rem; }

/* ===== Screenshots Section ===== */
.screenshots {
  padding: 80px 24px;
  background: var(--bg-alt);
  text-align: center;
}
.screenshots h2 { font-size: 2rem; font-weight: 700; margin-bottom: 16px; }
.screenshots p { color: var(--text-light); max-width: 500px; margin: 0 auto 40px; }
.screenshots-scroll {
  display: flex;
  gap: 20px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  padding: 10px 0 20px;
  max-width: var(--max-width);
  margin: 0 auto;
  scrollbar-width: thin;
  scrollbar-color: var(--primary-light) var(--bg-alt);
}
.screenshots-scroll::-webkit-scrollbar { height: 6px; }
.screenshots-scroll::-webkit-scrollbar-track { background: var(--bg-alt); border-radius: 3px; }
.screenshots-scroll::-webkit-scrollbar-thumb { background: var(--primary-light); border-radius: 3px; }
.screenshot-img {
  height: 520px;
  width: auto;
  border-radius: 24px;
  box-shadow: 0 8px 30px rgba(0,0,0,0.12);
  scroll-snap-align: start;
  flex-shrink: 0;
  transition: transform 0.2s;
}
.screenshot-img:hover { transform: translateY(-4px); box-shadow: 0 12px 40px rgba(0,0,0,0.18); }
@media (max-width: 768px) {
  .screenshots-scroll {
    gap: 14px;
    padding: 8px 12px 16px;
  }
  .screenshot-img { height: 400px; border-radius: 18px; }
}

/* ===== Download Section ===== */
.download {
  padding: 80px 24px;
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}
.download h2 { font-size: 2rem; font-weight: 700; margin-bottom: 12px; }
.download p { color: var(--text-light); margin-bottom: 32px; }
.download-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ===== Footer ===== */
.footer {
  border-top: 1px solid var(--border);
  padding: 32px 24px;
}
.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-links { display: flex; gap: 20px; list-style: none; flex-wrap: wrap; }
.footer-links a {
  text-decoration: none;
  color: var(--text-light);
  font-size: 0.9rem;
}
.footer-links a:hover { color: var(--primary); }
.footer-copy { color: var(--text-light); font-size: 0.85rem; }

/* ===== Legal Pages (Privacy Policy / Terms) ===== */
.legal-page {
  max-width: 800px;
  margin: 0 auto;
  padding: 60px 24px 80px;
}
.legal-page h1 {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--primary-dark);
  margin-bottom: 8px;
}
.legal-page .last-updated {
  color: var(--text-light);
  font-size: 0.9rem;
  margin-bottom: 40px;
}
.legal-page h2 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text);
  margin: 32px 0 12px;
  padding-top: 8px;
}
.legal-page p, .legal-page li {
  color: var(--text-light);
  margin-bottom: 12px;
}
.legal-page ul {
  margin-left: 24px;
  margin-bottom: 16px;
}
.legal-page a { color: var(--primary); text-decoration: underline; }
.legal-section {
  background: var(--bg-alt);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 20px;
  border-left: 4px solid var(--primary-light);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .hero h1 { font-size: 2rem; }
  .hero p { font-size: 1rem; }
  .nav-links { display: none; }
  .features-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; text-align: center; }
  .screenshots-grid { flex-direction: column; align-items: center; }
}

/* ===== Mobile Nav ===== */
.mobile-menu-btn { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
@media (max-width: 768px) {
  .mobile-menu-btn { display: block; }
}