/* Pham Theu — App Store Landing Page */

:root {
  --color-bg: #fafafa;
  --color-surface: #ffffff;
  --color-text: #1d1d1f;
  --color-text-secondary: #6e6e73;
  --color-accent: #0071e3;
  --color-accent-hover: #0077ed;
  --color-border: #d2d2d7;
  --color-footer: #f5f5f7;
  --font-system: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --max-width: 980px;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-system);
  font-size: 17px;
  line-height: 1.47059;
  font-weight: 400;
  letter-spacing: -0.022em;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  text-decoration: underline;
}

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

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 250, 250, 0.8);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 22px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 21px;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
}

.logo:hover {
  text-decoration: none;
}

.logo-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 18px;
  font-weight: 700;
}

.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  font-size: 14px;
  color: var(--color-text-secondary);
  text-decoration: none;
}

.nav-links a:hover {
  color: var(--color-text);
  text-decoration: none;
}

/* Hero */
.hero {
  text-align: center;
  padding: 80px 22px 60px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: rgba(0, 113, 227, 0.08);
  padding: 6px 14px;
  border-radius: 20px;
  margin-bottom: 20px;
}

.hero h1 {
  font-size: clamp(40px, 6vw, 56px);
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.07143;
  margin-bottom: 16px;
}

.hero-subtitle {
  font-size: clamp(19px, 3vw, 24px);
  font-weight: 400;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto 32px;
  line-height: 1.33337;
}

.app-icon-large {
  width: 120px;
  height: 120px;
  border-radius: 26px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  margin: 0 auto 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 48px;
  font-weight: 700;
  color: #fff;
  box-shadow: var(--shadow);
}

.cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  align-items: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 980px;
  font-size: 17px;
  font-weight: 400;
  text-decoration: none;
  transition: background 0.2s, transform 0.15s;
  border: none;
  cursor: pointer;
}

.btn:hover {
  text-decoration: none;
  transform: scale(1.02);
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  color: #fff;
}

.btn-secondary {
  background: transparent;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
}

.btn-secondary:hover {
  background: rgba(0, 113, 227, 0.06);
  color: var(--color-accent);
}

.app-store-badge {
  height: 44px;
}

/* Features */
.features {
  background: var(--color-surface);
  padding: 80px 22px;
}

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-title {
  font-size: 32px;
  font-weight: 700;
  text-align: center;
  letter-spacing: -0.003em;
  margin-bottom: 12px;
}

.section-desc {
  text-align: center;
  color: var(--color-text-secondary);
  max-width: 560px;
  margin: 0 auto 48px;
  font-size: 19px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
}

.feature-card {
  padding: 32px;
  border-radius: var(--radius);
  background: var(--color-bg);
  border: 1px solid rgba(0, 0, 0, 0.04);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: rgba(0, 113, 227, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 21px;
  font-weight: 600;
  margin-bottom: 8px;
}

.feature-card p {
  color: var(--color-text-secondary);
  font-size: 15px;
  line-height: 1.5;
}

/* About / Support */
.about {
  padding: 80px 22px;
  text-align: center;
}

.about p {
  max-width: 640px;
  margin: 0 auto;
  color: var(--color-text-secondary);
  font-size: 19px;
}

/* Legal pages */
.legal-page {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 22px 80px;
}

.legal-page h1 {
  font-size: 40px;
  font-weight: 700;
  letter-spacing: -0.003em;
  margin-bottom: 8px;
}

.legal-meta {
  color: var(--color-text-secondary);
  font-size: 14px;
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}

.legal-page h2 {
  font-size: 24px;
  font-weight: 600;
  margin-top: 40px;
  margin-bottom: 12px;
}

.legal-page h3 {
  font-size: 19px;
  font-weight: 600;
  margin-top: 24px;
  margin-bottom: 8px;
}

.legal-page p,
.legal-page li {
  color: var(--color-text);
  margin-bottom: 12px;
  font-size: 15px;
  line-height: 1.6;
}

.legal-page ul,
.legal-page ol {
  padding-left: 24px;
  margin-bottom: 16px;
}

.legal-page li {
  margin-bottom: 6px;
}

.legal-page a {
  word-break: break-word;
}

.contact-box {
  background: var(--color-footer);
  border-radius: var(--radius);
  padding: 24px;
  margin-top: 32px;
}

.contact-box p {
  margin-bottom: 4px;
}

/* Footer */
.site-footer {
  background: var(--color-footer);
  border-top: 1px solid var(--color-border);
  padding: 32px 22px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  list-style: none;
}

.footer-links a {
  font-size: 12px;
  color: var(--color-text-secondary);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--color-text);
  text-decoration: underline;
}

.footer-copy {
  font-size: 12px;
  color: var(--color-text-secondary);
}

/* Responsive */
@media (max-width: 734px) {
  .nav-links {
    gap: 16px;
  }

  .nav-links a {
    font-size: 12px;
  }

  .hero {
    padding: 60px 22px 40px;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .header-inner {
    padding: 0 16px;
  }

  .nav-links {
    display: none;
  }

  .legal-page h1 {
    font-size: 32px;
  }
}