/**
 * ========================================
 * RONGHAO Design System - Main CSS
 * ========================================
 * Main entry point for all CSS files.
 * Import order: Reset -> Variables -> Typography -> Components -> Layouts
 */

/* ========================================
   Base Styles
   ======================================== */
@import 'base/reset.css';
@import 'base/variables.css';
@import 'base/typography.css';

/* ========================================
   Component Styles
   ======================================== */
@import 'components/buttons.css';
@import 'components/cards.css';
@import 'components/navigation.css';

/* ========================================
   Layout Styles
   ======================================== */
@import 'layouts/header.css';
@import 'layouts/footer.css';

/* ========================================
   Layout Utilities
   ======================================== */
.container {
  max-width: var(--container-max, 1280px);
  margin: 0 auto;
  padding: 0 var(--container-padding, 24px);
}

.section {
  padding: var(--section-gap, 100px) 0;
}

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

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

/* ========================================
   Section Headers
   ======================================== */
.section-header {
  text-align: center;
  margin-bottom: var(--spacing-7xl, 60px);
}

.section-label {
  display: inline-block;
  color: var(--color-accent);
  font-size: var(--font-size-sm, 13px);
  font-weight: var(--font-weight-semibold, 600);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: var(--spacing-md, 12px);
}

.section-title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: var(--font-weight-bold, 700);
  color: var(--color-primary);
  line-height: 1.2;
}

/* ========================================
   Grid Layouts
   ======================================== */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(2, 280px);
  gap: var(--spacing-xl, 20px);
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-2xl, 24px);
}

/* ========================================
   CTA Banner
   ======================================== */
.cta-banner {
  margin-top: var(--spacing-7xl, 60px);
  background: linear-gradient(135deg, var(--color-primary) 0%, #1a1a1a 100%);
  border-radius: var(--radius-lg, 20px);
  padding: var(--spacing-7xl, 60px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-4xl, 40px);
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(190, 18, 60, 0.15) 0%, transparent 60%);
}

.cta-content {
  position: relative;
  z-index: 1;
}

.cta-title {
  font-size: var(--font-size-4xl, 32px);
  font-weight: var(--font-weight-bold, 700);
  color: var(--color-white);
  margin-bottom: var(--spacing-md, 12px);
}

.cta-description {
  font-size: var(--font-size-lg, 16px);
  color: rgba(255, 255, 255, 0.7);
  max-width: 500px;
}

.cta-actions {
  display: flex;
  gap: var(--spacing-lg, 16px);
  position: relative;
  z-index: 1;
  flex-shrink: 0;
}

/* ========================================
   Promise List
   ======================================== */
.promise-list {
  display: flex;
  gap: var(--spacing-5xl, 40px);
  flex: 1;
}

.promise-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md, 12px);
}

.promise-icon {
  width: 24px;
  height: 24px;
  color: var(--color-accent);
  flex-shrink: 0;
}

.promise-text {
  font-size: var(--font-size-md, 15px);
  font-weight: var(--font-weight-medium, 500);
  color: var(--color-primary);
}

/* ========================================
   Animations
   ======================================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-in {
  animation: fadeInUp 0.8s ease-out forwards;
}

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }

/* ========================================
   Responsive Design
   ======================================== */

/* Tablet */
@media (max-width: 991px) {
  .bento-grid {
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: auto;
  }
  
  .bento-card-large {
    grid-column: span 2;
    grid-row: span 2;
    min-height: 400px;
  }
  
  .bento-card-medium {
    grid-column: span 1;
    min-height: 200px;
  }
  
  .bento-card-full {
    grid-column: span 2;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-2xl, 24px);
  }
  
  .products-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .cta-banner {
    flex-direction: column;
    text-align: center;
    padding: var(--spacing-4xl, 40px);
  }
  
  .cta-actions {
    flex-wrap: wrap;
    justify-content: center;
  }
}

/* Mobile */
@media (max-width: 767px) {
  .container {
    padding: 0 var(--container-padding-mobile, 16px);
  }
  
  .section {
    padding: var(--section-gap-tablet, 80px) 0;
  }
  
  .bento-grid {
    grid-template-columns: 1fr;
  }
  
  .bento-card-large,
  .bento-card-medium,
  .bento-card-full {
    grid-column: span 1;
    grid-row: span 1;
    min-height: auto;
  }
  
  .bento-card-large {
    padding: var(--spacing-2xl, 24px);
  }
  
  .bento-card-large .card-title {
    font-size: var(--font-size-3xl, 24px);
  }
  
  .products-grid {
    grid-template-columns: 1fr;
  }
  
  .cta-banner {
    padding: var(--spacing-2xl, 24px);
  }
  
  .cta-title {
    font-size: var(--font-size-3xl, 24px);
  }
  
  .cta-actions {
    flex-direction: column;
    width: 100%;
  }
  
  .cta-actions .btn {
    width: 100%;
  }
  
  .promise-list {
    flex-direction: column;
    gap: var(--spacing-xl, 20px);
  }
}