/* ==========================================================================
   STYLE.CSS - Base Styles & Foundation
   ========================================================================== */

/* CSS Custom Properties */
:root {
  --color-white: #ffffff;
  --color-gray-100: #f5f5f5;
  --color-gray-200: #e5e5e5;
  --color-gray-300: #d4d4d4;
  --color-gray-400: #a3a3a3;
  --color-gray-500: #737373;
  --color-gray-600: #525252;
  --color-gray-700: #404040;
  --color-gray-800: #262626;
  --color-black: #000000;
  --color-purple: #9333ea;
  
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  --spacing-xl: 48px;
  
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-3xl: 2.5rem;
}

/* Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-gray-800);
  background-color: var(--color-gray-100);
}

/* Layout */
.header,
.section,
.footer,
.hero-section {
  max-width: 100%;
  margin: 0 auto;
  background-color: var(--color-white);
  position: relative;
}

.section {
  padding: var(--spacing-lg) var(--spacing-md);
}

@media (min-width: 768px) {
  .section {
    padding: var(--spacing-xl) var(--spacing-lg);
  }
}

@media (min-width: 1024px) {
  .header,
  .section,
  .footer,
  .hero-section {
    max-width: 1200px;
  }
  
  .section {
    padding: var(--spacing-xl) var(--spacing-xl);
  }
}

.section h2 {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-black);
  margin-bottom: var(--spacing-md);
}

.section p {
  color: var(--color-gray-600);
  margin-bottom: var(--spacing-md);
}

/* Utility Classes */

/* Buttons */
.btn {
  background-color: var(--color-gray-800);
  color: var(--color-white);
  border: none;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  text-align: center;
  transition: background-color 0.2s;
}

.btn:hover {
  background-color: var(--color-gray-700);
}

.btn-sm {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-sm);
}

.btn-md {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-base);
  font-weight: 600;
}

.btn-lg {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-lg);
  border-radius: 8px;
}

.btn-full {
  width: 100%;
}

/* Cards */
.card {
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-300);
  padding: var(--spacing-sm);
}

.card-interactive {
  border: 2px solid var(--color-gray-300);
  border-radius: 8px;
  transition: border-color 0.2s, box-shadow 0.2s, background-color 0.2s;
  cursor: pointer;
}

.card-interactive:hover {
  border-color: var(--color-gray-400);
}

.card-interactive.active {
  border-color: var(--color-purple);
  box-shadow: 0 0 0 1px var(--color-purple);
}

/* Badges */
.badge {
  font-size: var(--font-size-sm);
  color: var(--color-gray-600);
  background-color: var(--color-gray-100);
  padding: 4px var(--spacing-xs);
  border-radius: 4px;
  border: 1px solid var(--color-gray-300);
  display: inline-block;
}

.badge-group {
  display: flex;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
  margin-bottom: var(--spacing-xs);
}

/* Grid Layouts */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: var(--spacing-md);
}

@media (min-width: 768px) {
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
  }
}

.grid-2 > .image-placeholder {
  margin-left: 0;
  margin-right: calc(-1 * var(--spacing-md));
  width: calc(100% + var(--spacing-md));
}

@media (min-width: 768px) {
  .grid-2 > .image-placeholder {
    margin-right: calc(-1 * var(--spacing-lg));
    width: calc(100% + var(--spacing-lg));
  }
}

@media (min-width: 1024px) {
  .grid-2 > .image-placeholder {
    margin-right: calc(-1 * var(--spacing-xl));
    width: calc(100% + var(--spacing-xl));
  }
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: var(--spacing-md);
}

@media (min-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

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

@media (min-width: 768px) {
  .grid-4 {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-sm);
  }
}

/* Flex Layouts */
.flex-col {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.flex-col-sm {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

/* Split Layouts - 50/50 Image/Content Layouts */
.split-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin-left: calc(-1 * var(--spacing-md));
  margin-right: calc(-1 * var(--spacing-md));
}

@media (min-width: 768px) {
  .split-layout {
    grid-template-columns: repeat(2, 1fr);
    margin-left: calc(-1 * var(--spacing-lg));
    margin-right: calc(-1 * var(--spacing-lg));
  }
}

@media (min-width: 1024px) {
  .split-layout {
    margin-left: calc(-1 * var(--spacing-xl));
    margin-right: calc(-1 * var(--spacing-xl));
  }
}

/* On mobile, always show image first */
.split-layout .split-image {
  order: 1;
  aspect-ratio: 4/3;
  margin: 0;
  width: 100%;
}

.split-layout .split-content {
  order: 2;
  padding: var(--spacing-md);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

@media (min-width: 768px) {
  /* Reset order on desktop - HTML source order determines layout */
  .split-layout .split-image,
  .split-layout .split-content {
    order: 0;
  }
  
  .split-layout .split-content {
    padding: var(--spacing-lg);
  }
}

@media (min-width: 1024px) {
  .split-layout .split-content {
    padding: var(--spacing-xl);
  }
}

/* Links */
.link {
  color: var(--color-purple);
  text-decoration: none;
  font-weight: 600;
}

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

.text-link {
  color: var(--color-gray-800);
  text-decoration: none;
  font-weight: 500;
  display: inline-block;
}