/* ========================================
   INVITRAH - Premium Digital Invitations
   Design System & Global Styles
   ======================================== */

/* ----------------------------------------
   1. CSS CUSTOM PROPERTIES (Design Tokens)
   ---------------------------------------- */
:root {
  /* Colors */
  --color-primary: #1F2A44;
  --color-primary-light: #2d3a54;
  --color-background: #FAFAFC;
  --color-cta: #2E8B57;
  --color-cta-hover: #257347;
  --color-text: #1F2A44;
  --color-text-muted: #6B7280;
  --color-text-light: #9CA3AF;
  --color-border: #E5E7EB;
  --color-card-bg: #FFFFFF;
  --color-section-alt: #F3F4F6;

  /* Typography */
  --font-heading: 'Playfair Display', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Font Sizes */
  --text-xs: 0.75rem;    /* 12px */
  --text-sm: 0.875rem;   /* 14px */
  --text-base: 1rem;     /* 16px */
  --text-lg: 1.125rem;   /* 18px */
  --text-xl: 1.25rem;    /* 20px */
  --text-2xl: 1.5rem;    /* 24px */
  --text-3xl: 1.875rem;  /* 30px */
  --text-4xl: 2.25rem;   /* 36px */
  --text-5xl: 3rem;      /* 48px */
  --text-6xl: 3.75rem;   /* 60px */

  /* Spacing */
  --space-1: 0.25rem;    /* 4px */
  --space-2: 0.5rem;     /* 8px */
  --space-3: 0.75rem;    /* 12px */
  --space-4: 1rem;       /* 16px */
  --space-5: 1.25rem;    /* 20px */
  --space-6: 1.5rem;     /* 24px */
  --space-8: 2rem;       /* 32px */
  --space-10: 2.5rem;    /* 40px */
  --space-12: 3rem;      /* 48px */
  --space-16: 4rem;      /* 64px */
  --space-20: 5rem;      /* 80px */
  --space-24: 6rem;      /* 96px */

  /* Layout */
  --container-max: 1200px;
  --container-padding: 1.5rem;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(31, 42, 68, 0.05);
  --shadow-md: 0 4px 6px rgba(31, 42, 68, 0.07);
  --shadow-lg: 0 10px 15px rgba(31, 42, 68, 0.1);
  --shadow-xl: 0 20px 25px rgba(31, 42, 68, 0.12);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;

  /* Z-index */
  --z-header: 100;
  --z-modal: 200;
  --z-tooltip: 300;
}

/* ----------------------------------------
   2. RESET & BASE STYLES
   ---------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-background);
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

ul, ol {
  list-style: none;
}

/* ----------------------------------------
   3. TYPOGRAPHY
   ---------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.2;
  color: var(--color-primary);
}

h1 {
  font-size: var(--text-4xl);
  font-weight: 700;
}

h2 {
  font-size: var(--text-3xl);
}

h3 {
  font-size: var(--text-2xl);
}

h4 {
  font-size: var(--text-xl);
}

p {
  margin-bottom: var(--space-4);
}

.text-muted {
  color: var(--color-text-muted);
}

.text-accent {
  font-family: var(--font-heading);
  font-style: italic;
  color: var(--color-cta);
}

/* ----------------------------------------
   4. LAYOUT UTILITIES
   ---------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.section {
  padding: var(--space-16) 0;
}

.section-alt {
  background-color: var(--color-section-alt);
}

.section-dark {
  background-color: var(--color-primary);
  color: var(--color-background);
}

.section-dark h2,
.section-dark h3 {
  color: var(--color-background);
}

/* ----------------------------------------
   5. BUTTONS
   ---------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  white-space: nowrap;
}

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

.btn-primary:hover {
  background-color: var(--color-cta-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
  background-color: var(--color-section-alt);
  border-color: var(--color-primary);
}

.btn-outline-light {
  background-color: transparent;
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn-outline-light:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: white;
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-base);
}

.btn-icon {
  width: 20px;
  height: 20px;
}

/* ----------------------------------------
   6. CARDS
   ---------------------------------------- */
.card {
  background-color: var(--color-card-bg);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card-bordered {
  border: 1px solid var(--color-border);
}

/* ----------------------------------------
   7. HEADER
   ---------------------------------------- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-primary);
}

.logo img {
  height: 36px;
  width: auto;
}

.nav {
  display: none;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav-link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-primary);
}

.header-cta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.mobile-menu-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  color: var(--color-primary);
}

.mobile-menu-btn svg {
  width: 24px;
  height: 24px;
}

/* Mobile Menu */
.mobile-nav {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  background-color: white;
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-4);
  box-shadow: var(--shadow-lg);
}

.mobile-nav.active {
  display: block;
}

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.mobile-nav-link {
  display: block;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
}

.mobile-nav-link:hover {
  background-color: var(--color-section-alt);
}

/* ----------------------------------------
   8. HERO SECTION
   ---------------------------------------- */
.hero {
  padding-top: calc(72px + var(--space-12));
  padding-bottom: var(--space-12);
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.hero-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
  align-items: center;
}

.hero-content {
  text-align: center;
}

.hero-title {
  font-size: var(--text-4xl);
  margin-bottom: var(--space-6);
  line-height: 1.15;
}

.hero-title .highlight {
  font-style: italic;
  position: relative;
}

.hero-title .highlight::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background-color: var(--color-cta);
  opacity: 0.5;
}

.hero-subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

.hero-buttons {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  align-items: center;
}

.hero-link {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  transition: color var(--transition-fast);
}

.hero-link:hover {
  color: var(--color-primary);
}

.hero-mockup {
  display: flex;
  justify-content: center;
}

.hero-mockup-img {
  max-width: 300px;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
}

/* ----------------------------------------
   9. STATS SECTION
   ---------------------------------------- */
.stats {
  padding: var(--space-10) 0;
  border-bottom: 1px solid var(--color-border);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
  text-align: center;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}

.stat-icon {
  width: 40px;
  height: 40px;
  color: var(--color-cta);
}

.stat-value {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-primary);
}

.stat-label {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* ----------------------------------------
   10. ABOUT SECTION
   ---------------------------------------- */
.about {
  text-align: center;
}

.section-header {
  max-width: 600px;
  margin: 0 auto var(--space-10);
}

.section-header h2 {
  margin-bottom: var(--space-4);
}

.section-header p {
  color: var(--color-text-muted);
}

.about-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-cta);
  font-weight: 500;
  margin-top: var(--space-4);
}

.about-link:hover {
  text-decoration: underline;
}

/* ----------------------------------------
   11. OCCASIONS SECTION
   ---------------------------------------- */
.occasions-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}

.occasion-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: all var(--transition-base);
}

.occasion-item:hover {
  border-color: var(--color-cta);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.occasion-icon {
  width: 48px;
  height: 48px;
  color: var(--color-primary);
}

.occasion-name {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
  text-align: center;
}

/* ----------------------------------------
   12. COMPARISON SECTION
   ---------------------------------------- */
.comparison-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.comparison-card {
  padding: var(--space-8);
  border-radius: var(--radius-xl);
}

.comparison-card.paper {
  background-color: var(--color-section-alt);
  border: 1px solid var(--color-border);
}

.comparison-card.invitrah {
  background-color: var(--color-primary);
  color: white;
}

.comparison-card.invitrah h3,
.comparison-card.invitrah .comparison-item {
  color: white;
}

.comparison-badge {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 600;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
}

.comparison-card.paper .comparison-badge {
  background-color: var(--color-border);
  color: var(--color-text-muted);
}

.comparison-card.invitrah .comparison-badge {
  background-color: var(--color-cta);
  color: white;
}

.comparison-card h3 {
  margin-bottom: var(--space-6);
}

.comparison-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.comparison-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.comparison-item svg {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  margin-top: 2px;
}

.comparison-card.paper .comparison-item svg {
  color: var(--color-text-muted);
}

.comparison-card.invitrah .comparison-item svg {
  color: var(--color-cta);
}

/* ----------------------------------------
   13. SAMPLES SECTION
   ---------------------------------------- */
.samples-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.sample-card {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  aspect-ratio: 3/4;
  cursor: pointer;
}

.sample-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.sample-card:hover img {
  transform: scale(1.05);
}

.sample-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(31, 42, 68, 0.8), transparent);
  display: flex;
  align-items: flex-end;
  padding: var(--space-6);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.sample-card:hover .sample-overlay {
  opacity: 1;
}

.sample-label {
  color: white;
  font-weight: 600;
}

.samples-footer {
  text-align: center;
  margin-top: var(--space-8);
}

/* ----------------------------------------
   14. PROCESS SECTION
   ---------------------------------------- */
.process-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

.process-step {
  text-align: center;
}

.process-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background-color: var(--color-section-alt);
  border-radius: var(--radius-full);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}

.process-step h4 {
  margin-bottom: var(--space-2);
}

.process-step p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* ----------------------------------------
   15. PRICING SECTION
   ---------------------------------------- */
.pricing {
  background-color: var(--color-primary);
  color: white;
}

.pricing .section-header h2 {
  color: white;
}

.pricing .section-header p {
  color: rgba(255, 255, 255, 0.7);
}

.pricing-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.pricing-card {
  background-color: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  text-align: center;
  position: relative;
}

.pricing-card.popular {
  background-color: white;
  color: var(--color-primary);
  border: none;
}

.pricing-popular-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--color-cta);
  color: white;
  padding: var(--space-1) var(--space-4);
  font-size: var(--text-xs);
  font-weight: 600;
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.pricing-name {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-4);
}

.pricing-card.popular .pricing-name {
  color: var(--color-primary);
}

.pricing-price {
  font-family: var(--font-heading);
  font-size: var(--text-4xl);
  font-weight: 700;
  margin-bottom: var(--space-6);
}

.pricing-price span {
  font-size: var(--text-sm);
  font-weight: 400;
  opacity: 0.7;
}

.pricing-features {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
  text-align: left;
}

.pricing-feature {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
}

.pricing-feature svg {
  width: 16px;
  height: 16px;
  color: var(--color-cta);
  flex-shrink: 0;
}

.pricing-card:not(.popular) .pricing-feature svg {
  color: rgba(255, 255, 255, 0.7);
}

.pricing-card .btn {
  width: 100%;
}

/* ----------------------------------------
   16. QUOTE SECTION
   ---------------------------------------- */
.quote {
  text-align: center;
  padding: var(--space-20) 0;
}

.quote blockquote {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-style: italic;
  color: var(--color-primary);
  max-width: 700px;
  margin: 0 auto;
}

/* ----------------------------------------
   17. FINAL CTA SECTION
   ---------------------------------------- */
.final-cta {
  text-align: center;
}

.final-cta h2 {
  margin-bottom: var(--space-8);
}

.final-cta-buttons {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  align-items: center;
}

/* ----------------------------------------
   18. FOOTER
   ---------------------------------------- */
.footer {
  background-color: var(--color-primary);
  color: white;
  padding: var(--space-12) 0 var(--space-6);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

.footer-brand .logo {
  color: white;
  margin-bottom: var(--space-3);
}

.footer-tagline {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 0;
}

.footer-links-group h4 {
  color: white;
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--space-4);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-link {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.7);
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: white;
}

.footer-bottom {
  padding-top: var(--space-6);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.5);
}

/* ----------------------------------------
   19. ANIMATIONS
   ---------------------------------------- */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ----------------------------------------
   20. RESPONSIVE STYLES
   ---------------------------------------- */

/* Tablet (640px+) */
@media (min-width: 640px) {
  :root {
    --container-padding: 2rem;
  }

  h1 {
    font-size: var(--text-5xl);
  }

  h2 {
    font-size: var(--text-4xl);
  }

  .hero-title {
    font-size: var(--text-5xl);
  }

  .hero-buttons {
    flex-direction: row;
    justify-content: center;
  }

  .stats-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .occasions-grid {
    grid-template-columns: repeat(5, 1fr);
  }

  .comparison-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .samples-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .process-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .pricing-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .quote blockquote {
    font-size: var(--text-3xl);
  }

  .final-cta-buttons {
    flex-direction: row;
    justify-content: center;
  }

  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

/* Desktop (1024px+) */
@media (min-width: 1024px) {
  .nav {
    display: block;
  }

  .mobile-menu-btn {
    display: none;
  }

  .hero-container {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
  }

  .hero-content {
    text-align: left;
  }

  .hero-subtitle {
    margin-left: 0;
    margin-right: 0;
  }

  .hero-buttons {
    justify-content: flex-start;
  }

  .hero-mockup-img {
    max-width: 400px;
  }
}

/* Large Desktop (1280px+) */
@media (min-width: 1280px) {
  h1 {
    font-size: var(--text-6xl);
  }

  .hero-title {
    font-size: var(--text-6xl);
  }
}

/* ----------------------------------------
   21. UTILITY CLASSES
   ---------------------------------------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.text-center {
  text-align: center;
}

.mt-4 { margin-top: var(--space-4); }
.mt-8 { margin-top: var(--space-8); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-8 { margin-bottom: var(--space-8); }