/* ============================================
   VariantLab Landing Page Styles
   Theme variables match the main app at app.variantlab.ai
   ============================================ */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@300;400;500;600;700&display=swap');

/* Theme CSS Variables - RGB values for alpha support */
:root {
  /* Dark theme (default) */
  --color-primary: 55 19 236;        /* #3713ec - Purple */
  --color-surface: 10 10 15;         /* #0a0a0f */
  --color-surface-secondary: 19 16 34; /* #131022 */
  --color-border: 59 50 103;         /* #3b3267 */
  --color-text-primary: 255 255 255;
  --color-text-secondary: 156 163 175; /* gray-400 */

  /* Spacing scale */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  /* Border radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 200ms ease;
  --transition-slow: 300ms ease;
}

:root.light {
  /* Light theme */
  --color-primary: 55 19 236;        /* #3713ec - Purple stays same */
  --color-surface: 246 246 248;      /* #f6f6f8 */
  --color-surface-secondary: 255 255 255; /* white */
  --color-border: 226 226 232;       /* #e2e2e8 */
  --color-text-primary: 10 10 15;
  --color-text-secondary: 107 114 128; /* gray-500 */
}

/* ============================================
   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: 'Space Grotesk', system-ui, -apple-system, sans-serif;
  background-color: rgb(var(--color-surface));
  color: rgb(var(--color-text-primary));
  line-height: 1.6;
  min-height: 100vh;
}

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

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

/* ============================================
   Layout
   ============================================ */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.section {
  padding: var(--spacing-3xl) 0;
}

.section--large {
  padding: 5rem 0;
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: 1.25rem; }

.text-secondary {
  color: rgb(var(--color-text-secondary));
}

.text-gradient {
  background: linear-gradient(135deg, rgb(var(--color-primary)), #8b5cf6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

/* ============================================
   Navigation
   ============================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgb(var(--color-surface) / 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgb(var(--color-border) / 0.5);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 600;
  font-size: 1.25rem;
}

.nav__logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, rgb(var(--color-primary)), #8b5cf6);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.nav__link {
  color: rgb(var(--color-text-secondary));
  transition: color var(--transition-fast);
  font-size: 0.9375rem;
}

.nav__link:hover {
  color: rgb(var(--color-text-primary));
}

.nav__link--active {
  color: rgb(var(--color-text-primary));
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.nav__mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: rgb(var(--color-text-primary));
  cursor: pointer;
  padding: var(--spacing-sm);
}

@media (max-width: 768px) {
  .nav__links {
    display: none;
  }

  .nav__mobile-toggle {
    display: flex;
  }

  .nav__links--open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgb(var(--color-surface));
    border-bottom: 1px solid rgb(var(--color-border));
    padding: var(--spacing-lg);
    gap: var(--spacing-md);
  }
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 0.75rem 1.5rem;
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 500;
  border-radius: var(--radius-lg);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

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

.btn--primary:hover {
  background: rgb(var(--color-primary) / 0.85);
  transform: translateY(-1px);
}

.btn--secondary {
  background: rgb(var(--color-text-primary) / 0.1);
  color: rgb(var(--color-text-primary));
  border: 1px solid rgb(var(--color-border));
}

.btn--secondary:hover {
  background: rgb(var(--color-text-primary) / 0.15);
}

.btn--large {
  padding: 1rem 2rem;
  font-size: 1rem;
}

.btn--icon {
  padding: 0.625rem;
  border-radius: var(--radius-md);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  padding-top: 8rem;
  padding-bottom: var(--spacing-3xl);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 150%;
  height: 100%;
  background: radial-gradient(ellipse at center top, rgb(var(--color-primary) / 0.15) 0%, transparent 60%);
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 1;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 0.5rem 1rem;
  background: rgb(var(--color-primary) / 0.1);
  border: 1px solid rgb(var(--color-primary) / 0.3);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  color: rgb(var(--color-text-primary));
  margin-bottom: var(--spacing-lg);
}

:root.light .hero__badge {
  color: rgb(var(--color-primary));
}

.hero__title {
  max-width: 900px;
  margin: 0 auto var(--spacing-lg);
}

.hero__subtitle {
  max-width: 700px;
  margin: 0 auto var(--spacing-xl);
  font-size: 1.125rem;
  color: rgb(var(--color-text-secondary));
}

.hero__cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

/* ============================================
   Feature Cards
   ============================================ */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-lg);
}

.feature-card {
  background: rgb(var(--color-surface-secondary));
  border: 1px solid rgb(var(--color-border) / 0.5);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  transition: all var(--transition-normal);
}

.feature-card:hover {
  border-color: rgb(var(--color-primary) / 0.5);
  transform: translateY(-2px);
}

.feature-card__icon {
  width: 48px;
  height: 48px;
  background: rgb(var(--color-primary) / 0.1);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-md);
  color: rgb(var(--color-primary));
}

:root.light .feature-card__icon {
  color: rgb(var(--color-primary));
}

.feature-card__title {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
}

.feature-card__description {
  color: rgb(var(--color-text-secondary));
  font-size: 0.9375rem;
}

/* ============================================
   Pipeline Section (Visual Steps)
   ============================================ */
.pipeline {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
}

.pipeline__step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--spacing-xl);
  align-items: start;
}

.pipeline__number {
  width: 48px;
  height: 48px;
  background: rgb(var(--color-primary));
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  color: white;
  flex-shrink: 0;
}

.pipeline__content h3 {
  margin-bottom: var(--spacing-sm);
}

.pipeline__content p {
  color: rgb(var(--color-text-secondary));
}

@media (max-width: 640px) {
  .pipeline__step {
    grid-template-columns: 1fr;
  }

  .pipeline__number {
    width: 40px;
    height: 40px;
  }
}

/* ============================================
   Pricing Cards
   ============================================ */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  max-width: 900px;
  margin: 0 auto;
}

.pricing-card {
  background: rgb(var(--color-surface-secondary));
  border: 1px solid rgb(var(--color-border) / 0.5);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  display: flex;
  flex-direction: column;
}

.pricing-card--featured {
  border-color: rgb(var(--color-primary));
  position: relative;
}

.pricing-card--featured::before {
  content: 'Popular';
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: rgb(var(--color-primary));
  color: white;
  padding: 0.25rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
}

.pricing-card__name {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.pricing-card__price {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
}

.pricing-card__price span {
  font-size: 1rem;
  font-weight: 400;
  color: rgb(var(--color-text-secondary));
}

.pricing-card__description {
  color: rgb(var(--color-text-secondary));
  margin-bottom: var(--spacing-lg);
  font-size: 0.9375rem;
}

.pricing-card__features {
  list-style: none;
  margin-bottom: var(--spacing-xl);
  flex-grow: 1;
}

.pricing-card__features li {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) 0;
  font-size: 0.9375rem;
}

.pricing-card__features li::before {
  content: '';
  width: 20px;
  height: 20px;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%233713ec'%3E%3Cpath d='M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z'/%3E%3C/svg%3E") center/contain no-repeat;
  flex-shrink: 0;
}

/* ============================================
   Use Case Cards
   ============================================ */
.use-case-card {
  background: rgb(var(--color-surface-secondary));
  border: 1px solid rgb(var(--color-border) / 0.5);
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.use-case-card__image {
  height: 200px;
  background: linear-gradient(135deg, rgb(var(--color-primary) / 0.2), rgb(var(--color-surface-secondary)));
  display: flex;
  align-items: center;
  justify-content: center;
}

.use-case-card__content {
  padding: var(--spacing-xl);
}

.use-case-card__title {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
}

.use-case-card__description {
  color: rgb(var(--color-text-secondary));
  margin-bottom: var(--spacing-md);
}

.use-case-card__benefits {
  list-style: none;
}

.use-case-card__benefits li {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-xs) 0;
  font-size: 0.9375rem;
  color: rgb(var(--color-text-secondary));
}

.use-case-card__benefits li::before {
  content: '';
  width: 6px;
  height: 6px;
  background: rgb(var(--color-primary));
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

/* ============================================
   CTA Section
   ============================================ */
.cta-section {
  background: linear-gradient(135deg, rgb(var(--color-primary) / 0.1), rgb(var(--color-surface-secondary)));
  border: 1px solid rgb(var(--color-border) / 0.5);
  border-radius: var(--radius-xl);
  padding: var(--spacing-3xl);
  text-align: center;
}

.cta-section h2 {
  margin-bottom: var(--spacing-md);
}

.cta-section p {
  color: rgb(var(--color-text-secondary));
  margin-bottom: var(--spacing-xl);
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

/* ============================================
   Footer
   ============================================ */
.footer {
  border-top: 1px solid rgb(var(--color-border) / 0.5);
  padding: var(--spacing-2xl) 0;
}

.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-lg);
  text-align: center;
}

.footer__links {
  display: flex;
  gap: var(--spacing-xl);
  flex-wrap: wrap;
  justify-content: center;
}

.footer__link {
  color: rgb(var(--color-text-secondary));
  font-size: 0.9375rem;
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: rgb(var(--color-text-primary));
}

.footer__copyright {
  color: rgb(var(--color-text-secondary));
  font-size: 0.875rem;
}

/* ============================================
   Theme Toggle
   ============================================ */
.theme-toggle {
  background: rgb(var(--color-text-primary) / 0.1);
  border: 1px solid rgb(var(--color-border));
  border-radius: var(--radius-md);
  padding: 0.5rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  color: rgb(var(--color-text-primary));
}

.theme-toggle:hover {
  background: rgb(var(--color-text-primary) / 0.15);
}

.theme-toggle__icon--light,
.theme-toggle__icon--dark {
  width: 20px;
  height: 20px;
}

:root .theme-toggle__icon--light { display: none; }
:root .theme-toggle__icon--dark { display: block; }

:root.light .theme-toggle__icon--light { display: block; }
:root.light .theme-toggle__icon--dark { display: none; }

/* ============================================
   FAQ Section
   ============================================ */
.faq-list {
  max-width: 700px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid rgb(var(--color-border) / 0.5);
}

.faq-item__question {
  width: 100%;
  background: none;
  border: none;
  padding: var(--spacing-lg) 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
  cursor: pointer;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 500;
  color: rgb(var(--color-text-primary));
  text-align: left;
}

.faq-item__icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.faq-item--open .faq-item__icon {
  transform: rotate(45deg);
}

.faq-item__answer {
  display: none;
  padding-bottom: var(--spacing-lg);
  color: rgb(var(--color-text-secondary));
}

.faq-item--open .faq-item__answer {
  display: block;
}

/* ============================================
   Utility Classes
   ============================================ */
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }
.mb-2xl { margin-bottom: var(--spacing-2xl); }

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}