/* ============================================
   KDSS Website — Components
   Buttons, Cards, Tables, Code Blocks, Badges
   ============================================ */

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  white-space: nowrap;
  line-height: 1;
}

.btn-primary {
  background: var(--gradient-hero);
  color: #fff;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.25);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.35);
  color: #fff;
}

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

.btn-secondary:hover {
  background: var(--bg-tertiary);
  border-color: var(--text-muted);
  color: var(--text-primary);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 13px;
}

.btn-lg {
  padding: 16px 32px;
  font-size: 16px;
}

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

/* --- Cards --- */
.card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all var(--transition-slow);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-card);
  opacity: 0;
  transition: opacity var(--transition-slow);
  pointer-events: none;
}

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

.card:hover::before {
  opacity: 1;
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
  background: var(--bg-tertiary);
}

.card-icon svg {
  width: 24px;
  height: 24px;
}

.card-icon.blue { color: var(--accent-blue); background: rgba(37,99,235,0.12); }
.card-icon.purple { color: var(--accent-purple); background: rgba(124,58,237,0.12); }
.card-icon.cyan { color: var(--accent-cyan); background: rgba(8,145,178,0.12); }
.card-icon.green { color: var(--accent-green); background: rgba(22,163,74,0.12); }

.card h3, .card h4 {
  margin-bottom: var(--space-sm);
}

.card p {
  font-size: 15px;
}

/* --- Feature Card (large) --- */
.feature-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  border-radius: var(--radius-xl);
  padding: var(--space-3xl);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
  transition: border-color var(--transition-slow);
}

.feature-card:hover {
  border-color: var(--border-hover);
}

.feature-card.reverse {
  direction: rtl;
}

.feature-card.reverse > * {
  direction: ltr;
}

.feature-content h3 {
  margin-bottom: var(--space-md);
}

.feature-content p {
  margin-bottom: var(--space-lg);
}

.feature-content ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.feature-content li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  color: var(--text-secondary);
  font-size: 15px;
}

.feature-content li::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-blue);
  margin-top: 8px;
  flex-shrink: 0;
}

.feature-visual {
  background: var(--bg-tertiary);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  border: 1px solid var(--border-color);
}

@media (max-width: 768px) {
  .feature-card {
    grid-template-columns: 1fr;
    padding: var(--space-xl);
    gap: var(--space-xl);
  }

  .feature-card.reverse {
    direction: ltr;
  }
}

/* --- Tables --- */
.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
}

table {
  font-size: 15px;
}

thead {
  background: var(--bg-tertiary);
}

th {
  padding: 14px 20px;
  text-align: left;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  border-bottom: 1px solid var(--border-color);
}

td {
  padding: 14px 20px;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-color);
}

tr:last-child td {
  border-bottom: none;
}

tbody tr {
  transition: background var(--transition-fast);
}

tbody tr:hover {
  background: rgba(0,0,0,0.02);
}

td.highlight {
  color: var(--accent-green);
  font-weight: 600;
  font-family: var(--font-mono);
}

/* --- Code Blocks --- */
.code-block {
  position: relative;
  margin: var(--space-lg) 0;
}

.code-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-tertiary);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  border: 1px solid var(--border-color);
  border-bottom: none;
}

.code-block-header span {
  font-size: 13px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.code-block pre {
  margin: 0;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  font-size: 12px;
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.copy-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
  background: var(--bg-secondary);
}

.copy-btn.copied {
  color: var(--accent-green);
  border-color: var(--accent-green);
}

/* --- Badges --- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 600;
  border-radius: 100px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-blue {
  background: rgba(37,99,235,0.1);
  color: var(--accent-blue);
  border: 1px solid rgba(37,99,235,0.15);
}

.badge-purple {
  background: rgba(124,58,237,0.1);
  color: var(--accent-purple);
  border: 1px solid rgba(124,58,237,0.15);
}

.badge-green {
  background: rgba(22,163,74,0.1);
  color: var(--accent-green);
  border: 1px solid rgba(22,163,74,0.15);
}

.badge-cyan {
  background: rgba(8,145,178,0.1);
  color: var(--accent-cyan);
  border: 1px solid rgba(8,145,178,0.15);
}

/* --- Stats --- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.stat-item {
  text-align: center;
  padding: var(--space-xl);
}

.stat-number {
  font-size: 48px;
  font-weight: 800;
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
  margin-bottom: var(--space-sm);
}

.stat-label {
  font-size: 15px;
  color: var(--text-secondary);
}

@media (max-width: 768px) {
  .stats-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .stat-number {
    font-size: 36px;
  }
}

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

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

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-xl);
}

@media (max-width: 1024px) {
  .grid-3, .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }
}

/* --- Tabs --- */
.tabs {
  display: flex;
  gap: 2px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: var(--space-xl);
  overflow-x: auto;
}

.tab {
  padding: var(--space-sm) var(--space-md);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  border-bottom: 2px solid transparent;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

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

.tab.active {
  color: var(--text-primary);
  border-bottom-color: var(--accent-blue);
}

/* --- Divider --- */
.divider {
  height: 1px;
  background: var(--border-color);
  margin: var(--space-3xl) 0;
}

/* --- Scroll reveal animation --- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Tag list --- */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.tag {
  padding: 6px 14px;
  font-size: 13px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 100px;
  color: var(--text-secondary);
}