/* Design System Components Library */
/* Based on Design Tokens */

/* ===== Button Components ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-family-heading);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  line-height: var(--line-height-normal);
  text-decoration: none;
  border: var(--border-width) solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  min-height: 44px; /* Accessibility */
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

/* Primary Button */
.btn-primary {
  background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-primary-light) 100%);
  color: var(--color-text-inverse);
  border-color: var(--brand-primary);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--brand-primary-dark) 0%, var(--brand-primary) 100%);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: var(--shadow-xs);
}

/* Secondary Button */
.btn-secondary {
  background: var(--color-surface);
  color: var(--brand-primary);
  border-color: var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-background);
  border-color: var(--brand-primary);
  box-shadow: var(--shadow-sm);
}

/* Ghost Button */
.btn-ghost {
  background: transparent;
  color: var(--brand-primary);
  border-color: transparent;
}

.btn-ghost:hover {
  background: var(--color-surface);
  border-color: var(--color-border-light);
}

/* Button Sizes */
.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
  min-height: 36px;
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--font-size-md);
  min-height: 52px;
}

/* Button with Icon */
.btn-icon {
  gap: var(--space-2);
}

.btn-icon-only {
  padding: var(--space-3);
  min-width: 44px;
}

/* ===== Card Components ===== */
.card {
  background: var(--color-surface-elevated);
  border: var(--border-width) solid var(--color-border-light);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: all var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card-header {
  padding: var(--space-6);
  border-bottom: var(--border-width) solid var(--color-border-light);
  background: linear-gradient(180deg, var(--color-background) 0%, var(--color-surface) 100%);
}

.card-body {
  padding: var(--space-6);
}

.card-footer {
  padding: var(--space-4) var(--space-6);
  border-top: var(--border-width) solid var(--color-border-light);
  background: var(--color-surface);
}

/* Featured Card */
.card-featured {
  border-color: var(--brand-accent-1);
  position: relative;
}

.card-featured::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--brand-accent-1), var(--brand-accent-3));
}

/* ===== Navigation Components ===== */
.nav-primary {
  display: flex;
  gap: var(--space-2);
  align-items: center;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-4);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  position: relative;
}

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

.nav-link-active,
.nav-link[aria-current="page"] {
  color: var(--brand-primary);
  font-weight: var(--font-weight-medium);
}

.nav-link-active::after,
.nav-link[aria-current="page"]::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: var(--space-4);
  right: var(--space-4);
  height: 2px;
  background: var(--brand-accent-1);
}

/* Mobile Navigation */
.nav-mobile {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--color-surface-elevated);
  border-top: var(--border-width) solid var(--color-border);
  box-shadow: var(--shadow-lg);
  z-index: var(--z-fixed);
  display: none;
}

@media (max-width: 767px) {
  .nav-mobile {
    display: flex;
  }
  
  .nav-primary {
    display: none;
  }
}

.nav-mobile-list {
  display: flex;
  justify-content: space-around;
  align-items: center;
  width: 100%;
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-mobile-item {
  flex: 1;
}

.nav-mobile-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-2) var(--space-1);
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: var(--font-size-xs);
  transition: all var(--transition-fast);
}

.nav-mobile-link:hover,
.nav-mobile-link[aria-current="page"] {
  color: var(--brand-primary);
}

.nav-mobile-icon {
  font-size: 1.25rem;
  margin-bottom: var(--space-1);
}

/* ===== Hero Section ===== */
.hero {
  background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-background) 50%, var(--color-surface) 100%);
  padding: var(--space-16) 0 var(--space-20);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    radial-gradient(circle at 20% 50%, rgba(52, 152, 219, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 50%, rgba(155, 89, 182, 0.1) 0%, transparent 50%);
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: center;
}

@media (max-width: 1023px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

.hero-title {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-light);
  color: var(--brand-primary);
  margin-bottom: var(--space-4);
  line-height: var(--line-height-tight);
}

.hero-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-8);
  line-height: var(--line-height-relaxed);
}

.hero-actions {
  display: flex;
  gap: var(--space-4);
}

@media (max-width: 767px) {
  .hero-actions {
    flex-direction: column;
  }
}

/* ===== Badge Components ===== */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-full);
  background: var(--color-surface);
  color: var(--color-text-secondary);
  border: var(--border-width) solid var(--color-border-light);
}

.badge-primary {
  background: var(--brand-primary);
  color: var(--color-text-inverse);
  border-color: var(--brand-primary);
}

.badge-success {
  background: var(--color-success);
  color: var(--color-text-inverse);
  border-color: var(--color-success);
}

.badge-warning {
  background: var(--color-warning);
  color: var(--brand-primary);
  border-color: var(--color-warning);
}

/* ===== Section Components ===== */
.section {
  padding: var(--space-20) 0;
  position: relative;
}

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

.section-header {
  text-align: center;
  margin-bottom: var(--space-12);
}

.section-title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-light);
  color: var(--brand-primary);
  margin-bottom: var(--space-4);
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: var(--container-reading);
  margin: 0 auto;
}

/* ===== Grid Layout ===== */
.grid {
  display: grid;
  gap: var(--grid-gap);
}

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

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

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

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

@media (max-width: 1023px) {
  .grid-cols-3,
  .grid-cols-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 767px) {
  .grid-cols-2,
  .grid-cols-3,
  .grid-cols-4 {
    grid-template-columns: repeat(1, 1fr);
  }
}

/* ===== Container ===== */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container-narrow {
  max-width: var(--container-narrow);
}

.container-reading {
  max-width: var(--container-reading);
}

.container-wide {
  max-width: var(--container-wide);
}

@media (max-width: 767px) {
  .container {
    padding: 0 var(--space-4);
  }
}

/* ===== Form Components ===== */
.form-group {
  margin-bottom: var(--space-6);
}

.form-label {
  display: block;
  margin-bottom: var(--space-2);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}

.form-input,
.form-textarea {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-base);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-background);
  color: var(--color-text-primary);
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--brand-accent-1);
  box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

/* ===== Loading States ===== */
.skeleton {
  background: linear-gradient(90deg, var(--color-surface) 25%, var(--color-border-light) 50%, var(--color-surface) 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s ease-in-out infinite;
}

@keyframes skeleton-loading {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

/* ===== Utility Classes ===== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.font-light { font-weight: var(--font-weight-light); }
.font-normal { font-weight: var(--font-weight-normal); }
.font-medium { font-weight: var(--font-weight-medium); }
.font-semibold { font-weight: var(--font-weight-semibold); }
.font-bold { font-weight: var(--font-weight-bold); }

.text-primary { color: var(--brand-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-muted { color: var(--color-text-muted); }
.text-success { color: var(--color-success); }
.text-danger { color: var(--color-danger); }

.bg-primary { background-color: var(--brand-primary); }
.bg-surface { background-color: var(--color-surface); }
.bg-white { background-color: var(--color-background); }

.rounded-sm { border-radius: var(--radius-sm); }
.rounded { border-radius: var(--radius-base); }
.rounded-md { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-full { border-radius: var(--radius-full); }

.shadow-none { box-shadow: none; }
.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }