/* Chuck Website — Design System
   Brand tokens from company/design/CHUCK.md
   Font: Inter (AktivGrotesk is iOS-only commercial) */

:root {
  --color-primary: #0094DE;
  --color-primary-dark: #0078B5;
  --color-secondary: #DCEEFC;
  --color-accent: #F1A343;
  --color-neutral: #F8F5F3;
  --color-outline: #A1B9C5;
  --color-text: #1a1a2e;
  --color-text-muted: #5a6778;
  --color-white: #ffffff;
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-card: 0 2px 8px rgba(0,0,0,0.06), 0 0 1px rgba(0,0,0,0.08);
  --shadow-elevated: 0 4px 16px rgba(0,0,0,0.08), 0 0 2px rgba(0,0,0,0.06);
  --max-width: 1120px;
  --nav-height: 64px;
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-family);
  color: var(--color-text);
  background: var(--color-neutral);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { color: var(--color-primary-dark); }

/* Container */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }

/* ============ NAV ============ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(161,185,197,0.2);
  height: var(--nav-height);
}
.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text);
}
.nav-logo img { height: 32px; width: auto; }
.nav-links { display: flex; align-items: center; gap: 28px; list-style: none; }
.nav-links a {
  color: var(--color-text-muted);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.15s;
}
.nav-links a:hover { color: var(--color-primary); }
.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--color-primary);
  color: var(--color-white) !important;
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  transition: background 0.15s;
}
.nav-cta:hover { background: var(--color-primary-dark); color: var(--color-white) !important; }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  margin: 5px 0;
  transition: 0.2s;
}

/* ============ HERO ============ */
.hero {
  background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-white) 100%);
  padding: 80px 0 60px;
  overflow: hidden;
}
.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.hero-content { max-width: 520px; }
.hero-badge {
  display: inline-block;
  background: var(--color-accent);
  color: var(--color-white);
  font-weight: 600;
  font-size: 0.8rem;
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.hero h1 {
  font-size: 3rem;
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}
.hero h1 span { color: var(--color-primary); }
.hero-sub {
  font-size: 1.2rem;
  color: var(--color-text-muted);
  margin-bottom: 28px;
  line-height: 1.5;
}
.hero-ctas { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.hero-ctas .app-store-badge img { height: 48px; }
.hero-rating {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}
.hero-rating .stars { color: var(--color-accent); font-size: 1rem; }
.hero-image { text-align: center; }
.hero-image img {
  max-height: 480px;
  width: auto;
  filter: drop-shadow(0 8px 32px rgba(0,0,0,0.12));
}

/* ============ SECTIONS ============ */
.section { padding: 80px 0; }
.section-alt { background: var(--color-white); }
.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 48px;
}
.section-header h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}
.section-header p {
  font-size: 1.1rem;
  color: var(--color-text-muted);
}

/* ============ FEATURES ============ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.feature-card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 32px;
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.2s, transform 0.2s;
}
.feature-card:hover {
  box-shadow: var(--shadow-elevated);
  transform: translateY(-2px);
}
.feature-icon {
  width: 48px;
  height: 48px;
  background: var(--color-secondary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  font-size: 1.5rem;
}
.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 8px;
}
.feature-card p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.5;
}

/* ============ PRICING ============ */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  max-width: 720px;
  margin: 0 auto;
}
.pricing-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-card);
  text-align: center;
}
.pricing-card.featured {
  border: 2px solid var(--color-primary);
  position: relative;
}
.pricing-card.featured::before {
  content: 'Most Popular';
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-primary);
  color: white;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 14px;
  border-radius: 20px;
  text-transform: uppercase;
}
.pricing-card h3 { font-size: 1.3rem; margin-bottom: 8px; }
.pricing-price {
  font-size: 2.5rem;
  font-weight: 700;
  margin: 16px 0 4px;
}
.pricing-price span { font-size: 1rem; font-weight: 400; color: var(--color-text-muted); }
.pricing-period { color: var(--color-text-muted); font-size: 0.9rem; margin-bottom: 20px; }
.pricing-features {
  list-style: none;
  text-align: left;
  margin-bottom: 24px;
}
.pricing-features li {
  padding: 8px 0;
  border-bottom: 1px solid var(--color-neutral);
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 8px;
}
.pricing-features li::before {
  content: '\2713';
  color: var(--color-primary);
  font-weight: 700;
}

/* ============ SOCIAL PROOF ============ */
.social-proof {
  text-align: center;
  padding: 48px 0;
}
.social-proof-rating {
  font-size: 3rem;
  font-weight: 700;
  color: var(--color-primary);
}
.social-proof .stars {
  color: var(--color-accent);
  font-size: 1.5rem;
  margin: 8px 0;
}
.social-proof p {
  color: var(--color-text-muted);
  font-size: 1rem;
}

/* ============ BADGES ============ */
.badges {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
  padding: 24px 0;
}
.badges img { height: 48px; width: auto; opacity: 0.85; }

/* ============ CTA SECTION ============ */
.cta-section {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
  text-align: center;
  padding: 64px 0;
  border-radius: var(--radius-xl);
  margin: 0 20px 60px;
}
.cta-section h2 { font-size: 2rem; margin-bottom: 12px; }
.cta-section p { opacity: 0.9; margin-bottom: 24px; font-size: 1.1rem; }
.cta-section .app-store-badge img { height: 52px; margin: 0 auto; }

/* ============ BUTTONS ============ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.15s;
  border: none;
  cursor: pointer;
}
.btn-primary {
  background: var(--color-primary);
  color: var(--color-white);
}
.btn-primary:hover { background: var(--color-primary-dark); color: var(--color-white); }
.btn-secondary {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-outline);
}
.btn-secondary:hover { border-color: var(--color-primary); }
.btn-white {
  background: var(--color-white);
  color: var(--color-primary);
}
.btn-white:hover { background: var(--color-neutral); color: var(--color-primary); }

/* ============ FOOTER ============ */
.footer {
  background: var(--color-white);
  border-top: 1px solid rgba(161,185,197,0.2);
  padding: 48px 0 24px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 32px;
}
.footer-brand p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-top: 12px;
  max-width: 280px;
}
.footer h4 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}
.footer ul { list-style: none; }
.footer ul li { margin-bottom: 10px; }
.footer ul a { color: var(--color-text-muted); font-size: 0.9rem; }
.footer ul a:hover { color: var(--color-primary); }
.footer-bottom {
  border-top: 1px solid var(--color-neutral);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* ============ CONTENT PAGES ============ */
.page-header {
  background: var(--color-white);
  padding: 48px 0 32px;
  border-bottom: 1px solid var(--color-neutral);
}
.page-header h1 {
  font-size: 2rem;
  font-weight: 700;
}
.page-header .subtitle {
  color: var(--color-text-muted);
  margin-top: 8px;
}
.page-content {
  padding: 48px 0 80px;
}
.page-content .container {
  max-width: 800px;
}
.page-content h2 {
  font-size: 1.4rem;
  font-weight: 600;
  margin-top: 36px;
  margin-bottom: 12px;
}
.page-content h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-top: 24px;
  margin-bottom: 8px;
}
.page-content p {
  margin-bottom: 16px;
  line-height: 1.7;
}
.page-content ul, .page-content ol {
  margin-bottom: 16px;
  padding-left: 24px;
}
.page-content li {
  margin-bottom: 8px;
  line-height: 1.6;
}
.page-content a {
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* ============ FAQ ============ */
.faq-section { margin-bottom: 32px; }
.faq-section h2 {
  font-size: 1.3rem;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-secondary);
}
details {
  background: var(--color-white);
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
  box-shadow: var(--shadow-card);
}
details summary {
  padding: 16px 20px;
  cursor: pointer;
  font-weight: 500;
  font-size: 1rem;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
details summary::-webkit-details-marker { display: none; }
details summary::after {
  content: '+';
  font-size: 1.3rem;
  color: var(--color-outline);
  transition: transform 0.2s;
}
details[open] summary::after {
  content: '\2212';
  color: var(--color-primary);
}
details .faq-answer {
  padding: 0 20px 16px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ============ 404 ============ */
.error-page {
  text-align: center;
  padding: 120px 0;
}
.error-page h1 {
  font-size: 6rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
}
.error-page h2 {
  font-size: 1.5rem;
  margin: 16px 0 24px;
}
.error-page p {
  color: var(--color-text-muted);
  margin-bottom: 32px;
}

/* ============ MOBILE ============ */
@media (max-width: 767px) {
  .nav-links { display: none; }
  .nav-links.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-white);
    padding: 20px;
    gap: 16px;
    border-bottom: 1px solid var(--color-neutral);
    box-shadow: var(--shadow-elevated);
  }
  .nav-toggle { display: block; }
  .hero .container { grid-template-columns: 1fr; text-align: center; }
  .hero-content { max-width: 100%; }
  .hero h1 { font-size: 2.2rem; }
  .hero-ctas { justify-content: center; }
  .hero-image { order: -1; }
  .hero-image img { max-height: 320px; margin: 0 auto; }
  .features-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; max-width: 400px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
  .cta-section { margin: 0 12px 40px; border-radius: var(--radius-lg); }
}

@media (min-width: 768px) and (max-width: 1023px) {
  .hero .container { gap: 32px; }
  .hero h1 { font-size: 2.5rem; }
  .footer-grid { grid-template-columns: 2fr 1fr 1fr; }
}