/* ============================================================
   WeightBuddy Landing Page - styles.css
   Design system: Plus Jakarta Sans, green primary (#4CAF50),
   warm cream background (#FFFBF7), accessible 50+ friendly
   ============================================================ */

/* ---------- CSS Variables ---------- */
:root {
  --color-primary: #4CAF50;
  --color-primary-dark: #388E3C;
  --color-primary-light: #E8F5E9;
  --color-primary-50: #F1F8E9;
  --color-cta: #FF6D00;
  --color-cta-hover: #E65100;
  --color-stars: #FFC107;
  --color-text: #1A1A1A;
  --color-text-secondary: #555;
  --color-text-muted: #888;
  --color-bg: #FFFBF7;
  --color-white: #fff;
  --color-border: #E0E0E0;
  --color-border-light: #F0F0F0;
  --color-footer-bg: #1A1A1A;
  --color-footer-text: #aaa;
  --font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.1);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.12);
  --transition: 0.3s cubic-bezier(0.25, 0.1, 0.25, 1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-family);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* ---------- Container ---------- */
.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Section Header ---------- */
.section-header {
  text-align: center;
  margin-bottom: 56px;
}
.section-label {
  display: inline-block;
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
}
.section-title {
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 16px;
  color: var(--color-text);
}
.section-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-weight: 600;
  font-size: 1rem;
  border-radius: var(--radius-full);
  padding: 14px 28px;
  transition: all var(--transition);
  border: 2px solid transparent;
  white-space: nowrap;
}
.btn-lg { padding: 16px 32px; font-size: 1.05rem; }
.btn-primary {
  background: var(--color-text);
  color: var(--color-white);
}
.btn-primary:hover {
  background: #333;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}
.btn-secondary {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn-secondary:hover {
  border-color: var(--color-text);
  transform: translateY(-2px);
}
.btn-white {
  background: var(--color-white);
  color: var(--color-primary-dark);
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}
.btn-white:hover {
  background: #f5f5f5;
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}
.btn-outline-white {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255,255,255,0.4);
}
.btn-outline-white:hover {
  background: rgba(255,255,255,0.12);
  border-color: rgba(255,255,255,0.7);
}

/* ============================================================
   NAVBAR
   ============================================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: all var(--transition);
  background: transparent;
}
.navbar.scrolled {
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  box-shadow: 0 1px 10px rgba(0,0,0,0.06);
  padding: 10px 0;
}
.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
}
.nav-logo-text {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-text);
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition);
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--color-primary);
}
.nav-cta {
  background: var(--color-primary) !important;
  color: var(--color-white) !important;
  padding: 10px 22px;
  border-radius: var(--radius-full);
  font-weight: 600 !important;
}
.nav-cta:hover {
  background: var(--color-primary-dark) !important;
}
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  padding: 4px 0;
  z-index: 1001;
}
.nav-hamburger span {
  display: block;
  height: 2.5px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  padding: 140px 0 80px;
  background: linear-gradient(180deg, var(--color-primary-light) 0%, var(--color-bg) 100%);
  overflow: hidden;
}
.hero-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary-dark);
  background: var(--color-white);
  padding: 8px 18px;
  border-radius: var(--radius-full);
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}
.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 20px;
  color: var(--color-text);
}
.text-gradient {
  background: linear-gradient(135deg, var(--color-primary) 0%, #66BB6A 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: 1.2rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 32px;
  max-width: 500px;
}
.hero-ctas {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}
.hero-trust {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* Hero Phone Mockup */
.hero-visual {
  display: flex;
  justify-content: center;
  position: relative;
}
.phone-mockup {
  width: 280px;
  height: 572px;
  background: #1A1A1A;
  border-radius: 44px;
  padding: 12px;
  position: relative;
  box-shadow: var(--shadow-xl), inset 0 0 0 2px #333;
}
.phone-notch {
  position: absolute;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  width: 100px;
  height: 28px;
  background: #1A1A1A;
  border-radius: 20px;
  z-index: 10;
}
.phone-screen {
  width: 100%;
  height: 100%;
  background: var(--color-bg);
  border-radius: 34px;
  overflow: hidden;
}
.phone-placeholder {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding-top: 44px;
}
.phone-placeholder-header {
  padding: 16px;
}
.ph-cal-card {
  background: var(--color-primary);
  border-radius: var(--radius-md);
  padding: 16px;
  text-align: center;
  color: var(--color-white);
}
.ph-cal-number {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  line-height: 1;
  margin-bottom: 4px;
}
.ph-cal-label {
  font-size: 0.75rem;
  opacity: 0.85;
}
.phone-placeholder-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  padding: 0 16px;
  flex: 1;
}
.ph-col-title {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 8px;
}
.ph-item {
  font-size: 0.7rem;
  background: var(--color-white);
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 6px;
  display: flex;
  justify-content: space-between;
  color: var(--color-text-secondary);
  box-shadow: var(--shadow-sm);
}
.ph-item span {
  font-weight: 700;
  color: var(--color-primary);
}
.phone-placeholder-mic {
  padding: 16px;
  text-align: center;
}
.ph-mic-btn {
  width: 56px;
  height: 56px;
  background: var(--color-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 8px;
  box-shadow: 0 4px 16px rgba(76,175,80,0.35);
}
.ph-mic-label {
  font-size: 0.7rem;
  color: var(--color-text-muted);
}

/* ============================================================
   SOCIAL PROOF
   ============================================================ */
.social-proof {
  padding: 40px 0;
  background: var(--color-white);
  border-top: 1px solid var(--color-border-light);
  border-bottom: 1px solid var(--color-border-light);
}
.social-proof-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
}
.proof-item { text-align: center; }
.proof-number {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 4px;
}
.proof-stars {
  display: flex;
  justify-content: center;
  gap: 2px;
  margin-bottom: 4px;
}
.proof-label {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  font-weight: 500;
}
.proof-divider {
  width: 1px;
  height: 40px;
  background: var(--color-border);
}

/* ============================================================
   HOW IT WORKS
   ============================================================ */
.how-it-works {
  padding: 96px 0;
  background: var(--color-bg);
}
.steps {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 0;
}
.step {
  text-align: center;
  padding: 24px 20px;
  max-width: 320px;
  flex: 1;
}
.step-number {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-white);
  font-size: 1.5rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  box-shadow: 0 4px 16px rgba(76,175,80,0.25);
  position: relative;
}
.step-number::after {
  content: '';
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  border: 2px dashed rgba(76,175,80,0.2);
}
.step-icon {
  margin-bottom: 16px;
}
.step-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.step-desc {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
}
.step-bubble {
  display: inline-block;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 12px 18px;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  font-style: italic;
  box-shadow: var(--shadow-md);
  position: relative;
}
.step-bubble::before {
  content: '';
  position: absolute;
  top: -7px;
  left: 50%;
  transform: translateX(-50%) rotate(45deg);
  width: 14px;
  height: 14px;
  background: var(--color-white);
  box-shadow: -1px -1px 2px rgba(0,0,0,0.03);
}
.step-bubble-reply {
  background: var(--color-primary-light);
  border: 1px solid rgba(76,175,80,0.15);
}
.step-bubble-reply::before {
  background: var(--color-primary-light);
}
.step-connector {
  display: flex;
  align-items: center;
  padding-top: 56px;
}

/* ============================================================
   FEATURES
   ============================================================ */
.features {
  padding: 96px 0;
  background: var(--color-white);
}
.feature-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
  margin-bottom: 80px;
}
.feature-row:last-child { margin-bottom: 0; }
.feature-row-reverse { direction: rtl; }
.feature-row-reverse > * { direction: ltr; }

.feature-title {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: 14px;
  line-height: 1.2;
}
.feature-desc {
  font-size: 1rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
}
.feature-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}
.feature-list li svg {
  flex-shrink: 0;
  margin-top: 2px;
}

/* Feature Phone Placeholder */
.feature-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}
.feature-phone {
  width: 240px;
  height: 480px;
  background: #1A1A1A;
  border-radius: 38px;
  padding: 10px;
  box-shadow: var(--shadow-xl);
}
.feature-phone-placeholder {
  width: 100%;
  height: 100%;
  background: var(--color-bg);
  border-radius: 30px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  padding: 20px;
}

/* Voice Bubbles (Feature 4) */
.feature-visual-quotes {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 400px;
}
.voice-bubble {
  background: var(--color-primary-light);
  border-radius: var(--radius-lg);
  padding: 18px 22px;
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  font-style: italic;
  box-shadow: var(--shadow-sm);
  border-left: 4px solid var(--color-primary);
  transition: transform var(--transition);
}
.voice-bubble:hover {
  transform: translateX(4px);
}

/* Accessibility Demo (Feature 5) */
.accessibility-demo {
  display: flex;
  justify-content: center;
}
.ad-comparison {
  display: flex;
  gap: 20px;
  align-items: stretch;
}
.ad-bad, .ad-good {
  padding: 28px;
  border-radius: var(--radius-lg);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  min-width: 160px;
}
.ad-bad {
  background: #FFF3F0;
  border: 2px solid #FFCDD2;
}
.ad-good {
  background: var(--color-primary-light);
  border: 2px solid rgba(76,175,80,0.3);
}
.ad-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}
.ad-text-small {
  font-size: 0.65rem;
  color: #aaa;
}
.ad-text-large {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
}
.ad-btn-small {
  font-size: 0.6rem;
  padding: 4px 10px;
  background: #ccc;
  border-radius: 4px;
  color: #888;
}
.ad-btn-large {
  font-size: 1rem;
  font-weight: 600;
  padding: 14px 28px;
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--radius-full);
}

/* ============================================================
   WHO IT'S FOR
   ============================================================ */
.who-its-for {
  padding: 96px 0;
  background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-primary-50) 100%);
}
.persona-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.persona-card {
  background: var(--color-white);
  border-radius: var(--radius-xl);
  padding: 32px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border-light);
  transition: all var(--transition);
}
.persona-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}
.persona-icon {
  width: 56px;
  height: 56px;
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}
.persona-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.persona-desc {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ============================================================
   TESTIMONIALS CAROUSEL
   ============================================================ */
.testimonials {
  padding: 96px 0;
  background: var(--color-white);
  overflow: hidden;
}
.carousel {
  position: relative;
}
.carousel-track {
  display: flex;
  gap: 24px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  padding: 8px 0 8px;
}
.carousel-track::-webkit-scrollbar { display: none; }

.testimonial-card {
  min-width: 340px;
  max-width: 340px;
  flex-shrink: 0;
  scroll-snap-align: start;
  background: var(--color-bg);
  border-radius: var(--radius-xl);
  padding: 28px;
  border: 1px solid var(--color-border-light);
  transition: all var(--transition);
}
.testimonial-card:hover {
  box-shadow: var(--shadow-md);
}
.tc-stars {
  display: flex;
  gap: 2px;
  margin-bottom: 16px;
}
.tc-quote {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
  font-style: italic;
}
.tc-quote::before {
  content: '\201C';
  font-size: 1.5rem;
  color: var(--color-primary);
  font-weight: 800;
  line-height: 0;
  vertical-align: -0.25em;
  margin-right: 4px;
  font-style: normal;
}
.tc-author {
  display: flex;
  align-items: center;
  gap: 12px;
}
.tc-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  flex-shrink: 0;
}
.tc-name {
  display: block;
  font-weight: 600;
  font-size: 0.95rem;
}
.tc-result {
  display: block;
  font-size: 0.8rem;
  color: var(--color-primary);
  font-weight: 600;
}

/* Carousel Dots */
.carousel-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 28px;
}
.carousel-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-border);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  padding: 0;
}
.carousel-dot:hover {
  background: var(--color-primary-light);
  transform: scale(1.2);
}
.carousel-dot.active {
  background: var(--color-primary);
  width: 28px;
  border-radius: var(--radius-full);
}

/* ============================================================
   FAQ
   ============================================================ */
.faq {
  padding: 96px 0;
  background: var(--color-bg);
}
.faq-list {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.faq-item {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-light);
  overflow: hidden;
  transition: box-shadow var(--transition);
}
.faq-item:hover {
  box-shadow: var(--shadow-sm);
}
.faq-item.open {
  box-shadow: var(--shadow-md);
  border-color: rgba(76,175,80,0.2);
}
.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text);
  text-align: left;
  transition: color var(--transition);
}
.faq-question:hover {
  color: var(--color-primary);
}
.faq-chevron {
  flex-shrink: 0;
  transition: transform var(--transition);
}
.faq-item.open .faq-chevron {
  transform: rotate(180deg);
  color: var(--color-primary);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 400ms cubic-bezier(0.25, 0.1, 0.25, 1);
}
.faq-item.open .faq-answer {
  max-height: 300px;
}
.faq-answer p {
  padding: 0 24px 20px;
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}
.faq-answer a {
  color: var(--color-primary);
  text-decoration: underline;
}

/* ============================================================
   FINAL CTA
   ============================================================ */
.final-cta {
  padding: 96px 0;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.final-cta::before {
  content: '';
  position: absolute;
  top: -120px;
  right: -80px;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: rgba(255,255,255,0.06);
}
.final-cta::after {
  content: '';
  position: absolute;
  bottom: -80px;
  left: -60px;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: rgba(255,255,255,0.04);
}
.final-cta-container {
  position: relative;
  z-index: 1;
}
.final-cta-title {
  font-size: 2.75rem;
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: 16px;
  line-height: 1.15;
}
.final-cta-subtitle {
  font-size: 1.15rem;
  color: rgba(255,255,255,0.85);
  margin-bottom: 32px;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.6;
}
.final-cta-buttons {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}
.final-cta-note {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.6);
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background: var(--color-footer-bg);
  padding: 56px 0 0;
  color: var(--color-footer-text);
}
.footer-container {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 40px;
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: 12px;
}
.footer-tagline {
  font-size: 0.95rem;
  color: var(--color-footer-text);
  line-height: 1.6;
}
.footer-links h4 {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-white);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 16px;
}
.footer-links a {
  display: block;
  font-size: 0.95rem;
  color: var(--color-footer-text);
  margin-bottom: 10px;
  transition: color var(--transition);
}
.footer-links a:hover {
  color: var(--color-white);
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 20px 0;
}
.footer-bottom p {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.4);
  text-align: center;
}

/* ============================================================
   SCROLL ANIMATIONS
   ============================================================ */
@keyframes fade-in-up {
  from { opacity: 0; transform: translateY(30px); }
  to   { opacity: 1; transform: translateY(0); }
}
[data-animate] { opacity: 0; }
[data-animate].visible {
  animation: fade-in-up 0.7s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

/* Stagger delays */
[data-animate*="stagger-1"].visible { animation-delay: 100ms; }
[data-animate*="stagger-2"].visible { animation-delay: 200ms; }
[data-animate*="stagger-3"].visible { animation-delay: 300ms; }
[data-animate*="stagger-4"].visible { animation-delay: 400ms; }

/* ============================================================
   REDUCED MOTION
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  [data-animate] { opacity: 1; transform: none; }
}

/* ============================================================
   RESPONSIVE: TABLET (max 1024px)
   ============================================================ */
@media (max-width: 1024px) {
  .hero-title { font-size: 2.75rem; }
  .section-title { font-size: 2.25rem; }
  .hero-container { gap: 32px; }
  .phone-mockup { width: 240px; height: 490px; border-radius: 38px; }
  .feature-row { gap: 36px; }
}

/* ============================================================
   RESPONSIVE: TABLET PORTRAIT (max 768px)
   ============================================================ */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }

  /* Mobile nav overlay */
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-white);
    z-index: 999;
    align-items: center;
    justify-content: center;
    gap: 28px;
  }
  .nav-links.open a {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
  }
  .nav-links.open .nav-cta {
    font-size: 1.1rem !important;
    padding: 14px 32px;
  }

  /* Hero */
  .hero { padding: 120px 0 60px; }
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  .hero-subtitle { max-width: 480px; }
  .hero-ctas { justify-content: center; }
  .hero-visual { order: -1; margin-bottom: 16px; }
  .phone-mockup {
    width: 200px;
    height: 410px;
    border-radius: 32px;
    padding: 8px;
  }
  .phone-notch { width: 72px; height: 20px; }
  .phone-screen { border-radius: 26px; }
  .hero-title { font-size: 2.25rem; }
  .section-title { font-size: 2rem; }
  .final-cta-title { font-size: 2rem; }

  /* Social Proof */
  .social-proof-container { gap: 24px; }
  .proof-divider { display: none; }
  .proof-number { font-size: 1.5rem; }

  /* Steps */
  .steps { flex-direction: column; align-items: center; }
  .step-connector { display: none; }
  .step { max-width: 400px; }

  /* Features */
  .feature-row {
    grid-template-columns: 1fr;
    text-align: center;
    margin-bottom: 48px;
  }
  .feature-row-reverse { direction: ltr; }
  .feature-text {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  .feature-list { text-align: left; max-width: 400px; }
  .feature-visual { order: -1; margin-bottom: 8px; }
  .feature-phone { width: 200px; height: 400px; border-radius: 32px; }
  .ad-comparison { flex-wrap: wrap; justify-content: center; }

  /* Personas */
  .persona-grid { grid-template-columns: 1fr; }

  /* Testimonials */
  .testimonial-card { min-width: 280px; max-width: 300px; }

  /* FAQ */
  .faq-question { padding: 18px 20px; font-size: 0.95rem; }
  .faq-answer p { padding: 0 20px 18px; }

  /* Final CTA */
  .final-cta { padding: 64px 0; }
  .final-cta-buttons {
    flex-direction: column;
    align-items: center;
  }
  .final-cta-buttons .btn { width: 100%; max-width: 320px; }

  /* Footer */
  .footer-container {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

/* ============================================================
   RESPONSIVE: SMALL MOBILE (max 480px)
   ============================================================ */
@media (max-width: 480px) {
  .hero-title { font-size: 1.875rem; }
  .section-title { font-size: 1.75rem; }
  .final-cta-title { font-size: 1.75rem; }
  .hero-ctas {
    flex-direction: column;
    width: 100%;
    align-items: stretch;
  }
  .social-proof-container { flex-direction: column; gap: 20px; }
  .persona-card { padding: 24px; }
  .testimonial-card {
    min-width: calc(100vw - 48px);
    max-width: calc(100vw - 48px);
    padding: 22px;
  }
  .phone-mockup {
    width: 180px;
    height: 368px;
    border-radius: 28px;
    padding: 7px;
  }
  .phone-notch { width: 60px; height: 18px; }
  .phone-screen { border-radius: 22px; }
}

/* ============================================================
   WIDE DESKTOP (min 1280px)
   ============================================================ */
@media (min-width: 1280px) {
  .container { max-width: 1200px; }
  .hero-container { gap: 64px; }
  .phone-mockup {
    width: 300px;
    height: 612px;
    border-radius: 48px;
    padding: 14px;
  }
  .phone-notch { width: 110px; height: 30px; }
  .phone-screen { border-radius: 38px; }
}

/* ============================================================
   PRINT
   ============================================================ */
@media print {
  .navbar, .final-cta, .carousel-dots { display: none; }
  body { background: white; color: black; }
  .hero { padding-top: 40px; background: none; }
  .footer { background: #f5f5f5; color: #333; }
}