/* ============================================
   BoardFlow — Interactive Design System Page
   ============================================ */

.design-system-page {
  overflow-y: auto;
  background: var(--canvas);
  color: var(--ink);
}

/* ---- Nav ---- */

.ds-nav {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-8);
  background: var(--glass-2);
  -webkit-backdrop-filter: blur(var(--blur-xl)) saturate(180%);
  backdrop-filter: blur(var(--blur-xl)) saturate(180%);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--shadow-soft), var(--glass-highlight);
}

.ds-nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-h4-size);
  font-weight: var(--weight-semibold);
  color: var(--ink);
  text-decoration: none;
}

.ds-nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.ds-nav-actions .theme-toggle {
  background: none;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-pill);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--ink-secondary);
  transition: all var(--transition-fast);
}

.ds-nav-actions .theme-toggle:hover {
  background: var(--surface-hover);
  color: var(--ink);
}

.ds-nav.ds-nav-scrolled {
  box-shadow: var(--shadow-elevated), var(--glass-highlight);
}

/* ---- Hero ---- */

.ds-hero {
  text-align: center;
  padding: var(--space-16) var(--space-8) var(--space-12);
  position: relative;
  overflow: hidden;
}

.ds-hero-shapes {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.ds-hero-shapes .shape {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.3;
  animation: ds-float 8s ease-in-out infinite alternate;
}

.ds-hero-shapes .shape:nth-child(1) {
  width: 300px;
  height: 300px;
  background: var(--primary);
  top: -80px;
  left: 10%;
}

.ds-hero-shapes .shape:nth-child(2) {
  width: 250px;
  height: 250px;
  background: var(--accent-rose);
  top: -40px;
  right: 15%;
  animation-delay: -2s;
}

.ds-hero-shapes .shape:nth-child(3) {
  width: 200px;
  height: 200px;
  background: var(--accent-cyan);
  bottom: -60px;
  left: 50%;
  animation-delay: -4s;
}

@keyframes ds-float {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(30px, -20px) scale(1.1); }
}

.ds-hero h1 {
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 800;
  letter-spacing: -1.5px;
  line-height: 1.05;
  margin: 0 0 var(--space-3);
  background: linear-gradient(135deg, var(--primary), var(--accent-violet), var(--accent-rose));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.ds-hero p {
  font-size: var(--text-body-size);
  color: var(--ink-muted);
  max-width: 500px;
  margin: 0 auto var(--space-6);
  line-height: 1.6;
}

.ds-hero-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-8);
}

.ds-hero-stat {
  text-align: center;
}

.ds-hero-stat-value {
  font-size: 28px;
  font-weight: 700;
  color: var(--primary);
}

.ds-hero-stat-label {
  font-size: var(--text-caption-size);
  color: var(--ink-muted);
}

/* ---- Section ---- */

.ds-section {
  padding: var(--space-12) var(--space-8);
  max-width: 960px;
  margin: 0 auto;
}

.ds-section-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-8);
}

.ds-section-number {
  font-size: var(--text-xs-size);
  font-weight: 700;
  color: var(--primary);
  background: var(--primary-subtle);
  padding: 2px 10px;
  border-radius: var(--radius-pill);
  letter-spacing: 0.5px;
}

.ds-section-title {
  font-size: var(--text-h2-size);
  font-weight: 700;
  margin: 0;
  letter-spacing: var(--tracking-heading-2);
}

.ds-section-desc {
  font-size: var(--text-body-sm-size);
  color: var(--ink-muted);
  margin: var(--space-1) 0 0 0;
}

/* ---- Color Grid ---- */

.ds-color-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
  gap: var(--space-2);
}

.ds-color-card {
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--hairline);
  background: var(--surface);
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

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

.ds-color-swatch {
  height: 56px;
  display: flex;
  align-items: flex-end;
  padding: var(--space-1) var(--space-2);
}

.ds-color-swatch label {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: rgba(255,255,255,0.8);
  background: rgba(0,0,0,0.2);
  padding: 1px 6px;
  border-radius: 4px;
}

.ds-color-info {
  padding: var(--space-1) var(--space-2) var(--space-2);
}

.ds-color-name {
  font-size: 12px;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 1px;
  line-height: 1.3;
}

.ds-color-hex {
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--ink-muted);
}

.ds-color-card.copied .ds-color-hex::after {
  content: ' Copied!';
  color: var(--success);
  font-weight: 600;
}

/* ---- Typography Scale ---- */

.ds-type-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.ds-type-item {
  display: flex;
  align-items: baseline;
  gap: var(--space-6);
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-card);
  background: var(--surface);
  border: 1px solid var(--hairline);
  transition: border-color var(--transition-fast);
}

.ds-type-item:hover {
  border-color: var(--primary);
}

.ds-type-label {
  min-width: 100px;
  font-size: var(--text-xs-size);
  font-weight: 600;
  color: var(--primary);
  font-family: var(--font-mono);
  letter-spacing: 0;
}

.ds-type-sample {
  flex: 1;
  color: var(--ink);
  margin: 0;
}

.ds-type-meta {
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--ink-faint);
  text-align: right;
  min-width: 100px;
}

/* ---- Spacing Visualizer ---- */

.ds-spacing-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.ds-spacing-item {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.ds-spacing-label {
  min-width: 100px;
  font-size: var(--text-xs-size);
  font-weight: 600;
  font-family: var(--font-mono);
  color: var(--ink-muted);
}

.ds-spacing-block {
  background: linear-gradient(135deg, var(--primary), var(--accent-violet));
  border-radius: var(--radius-xs);
  flex-shrink: 0;
  opacity: 0.6;
  transition: opacity var(--transition-fast);
}

.ds-spacing-block:hover {
  opacity: 1;
}

.ds-spacing-value {
  font-size: var(--text-xs-size);
  font-family: var(--font-mono);
  color: var(--ink-faint);
  min-width: 60px;
}

/* ---- Button Showcase ---- */

.ds-button-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
}

.ds-button-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.ds-button-group-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--ink-faint);
}

.ds-button-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: center;
}

/* ---- Glass Showcase ---- */

.ds-glass-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-4);
}

.ds-glass-card {
  padding: var(--space-6);
  border-radius: var(--radius-card);
  border: 1px solid var(--glass-border);
  background: var(--glass-1);
  -webkit-backdrop-filter: blur(var(--blur-sm));
  backdrop-filter: blur(var(--blur-sm));
  box-shadow: var(--shadow-glass), var(--glass-highlight);
  transition: all var(--transition-base);
}

.ds-glass-card:hover {
  background: var(--glass-2);
  -webkit-backdrop-filter: blur(var(--blur-lg));
  backdrop-filter: blur(var(--blur-lg));
  box-shadow: var(--shadow-glass-hover), var(--glass-highlight);
  transform: translateY(-2px);
}

.ds-glass-card h4 {
  margin: 0 0 var(--space-2);
  font-size: var(--text-h4-size);
  font-weight: 600;
}

.ds-glass-card p {
  margin: 0;
  font-size: var(--text-body-sm-size);
  color: var(--ink-secondary);
  line-height: 1.5;
}

.ds-glass-card .ds-glass-badge {
  display: inline-block;
  margin-top: var(--space-3);
  padding: 2px 10px;
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-radius: var(--radius-pill);
  background: var(--glass-3);
  border: 1px solid var(--glass-border);
}

/* ---- Blur Slider ---- */

.ds-blur-demo {
  position: relative;
  padding: var(--space-8);
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--hairline);
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: var(--space-4);
}

.ds-blur-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 30% 40%, var(--primary) 0%, transparent 50%),
    radial-gradient(circle at 70% 60%, var(--accent-rose) 0%, transparent 50%),
    radial-gradient(circle at 50% 80%, var(--accent-cyan) 0%, transparent 50%);
  z-index: 0;
}

.ds-blur-card {
  position: relative;
  z-index: 1;
  padding: var(--space-6) var(--space-8);
  border-radius: var(--radius-card);
  border: 1px solid var(--glass-border);
  background: rgba(255, 255, 255, 0.55);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-glass), var(--glass-highlight);
  text-align: center;
  transition: backdrop-filter var(--transition-base);
}

.ds-blur-card h3 {
  margin: 0 0 var(--space-1);
  font-size: var(--text-h3-size);
  color: var(--ink);
}

.ds-blur-card p {
  margin: 0;
  font-size: var(--text-body-sm-size);
  color: var(--ink-secondary);
}

.ds-blur-control {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.ds-blur-control label {
  font-size: var(--text-caption-size);
  color: var(--ink-muted);
  font-weight: 500;
}

.ds-blur-control input[type="range"] {
  width: 200px;
  accent-color: var(--primary);
}

.ds-blur-value {
  font-size: var(--text-xs-size);
  font-family: var(--font-mono);
  color: var(--ink-secondary);
  min-width: 40px;
  text-align: center;
}

/* ---- Shadow Showcase ---- */

.ds-shadow-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-4);
}

.ds-shadow-card {
  padding: var(--space-6);
  border-radius: var(--radius-card);
  background: var(--surface);
  text-align: center;
  font-size: var(--text-caption-size);
  color: var(--ink-muted);
}

/* ---- Elevation Demo ---- */

.ds-elevation-demo {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
  align-items: flex-end;
  padding: var(--space-8);
  border-radius: var(--radius-card);
  background: var(--canvas);
  border: 1px solid var(--hairline);
}

.ds-elevation-box {
  width: 100px;
  height: 100px;
  border-radius: var(--radius-sm);
  background: var(--surface);
  border: 1px solid var(--hairline);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--ink-muted);
  transition: box-shadow var(--transition-fast);
}

/* ---- Responsive ---- */

@media (max-width: 767px) {
  .ds-section {
    padding: var(--space-8) var(--space-4);
  }

  .ds-color-grid {
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  }

  .ds-type-item {
    flex-direction: column;
    gap: var(--space-2);
  }

  .ds-type-meta {
    text-align: left;
  }
}