/* ============================================
   ANTHROPIC DESIGN SYSTEM TOKENS
   Based on Anthropic Design Reference Guide
   ============================================ */

:root {
  /* Font Stack */
  --font-family-sans: "Styrene A", "Inter", system-ui, -apple-system, sans-serif;
  --font-family-mono: "Söhne Mono", "JetBrains Mono", "Fira Code", monospace;

  /* Type Scale */
  --text-display: 36px;
  --text-h1: 28px;
  --text-h2: 22px;
  --text-h3: 18px;
  --text-h4: 16px;
  --text-body: 15px;
  --text-body-sm: 14px;
  --text-caption: 13px;
  --text-label: 12px;
  --text-code: 14px;

  /* Spacing Scale (4px base) */
  --space-0: 0px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;

  /* Border Radii */
  --radius-none: 0px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
  --shadow-none: none;

  /* Animation */
  --duration-instant: 100ms;
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --duration-slow: 400ms;
}

/* ============================================
   LIGHT THEME (default)
   ============================================ */

:root,
:root[data-theme="light"] {
  --color-brand-primary: #e3694c;
  --color-brand-primary-hover: #d4593d;
  --color-brand-primary-subtle: #fdf0ed;

  --color-text-primary: #1a1a1a;
  --color-text-secondary: #6b6b6b;
  --color-text-tertiary: #757575;

  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f7f7f7;
  --color-bg-tertiary: #efefef;

  --color-border-default: #e5e5e5;
  --color-border-subtle: #f0f0f0;

  --color-success: #16a34a;
  --color-warning: #ca8a04;
  --color-error: #dc2626;
  --color-info: #2563eb;
}

/* ============================================
   DARK THEME
   ============================================ */

:root[data-theme="dark"] {
  --color-brand-primary: #7ba7d9;
  --color-brand-primary-hover: #9bbde6;
  --color-brand-primary-subtle: #1e2a3d;

  --color-text-primary: #f5f5f5;
  --color-text-secondary: #a3a3a3;
  --color-text-tertiary: #949494;

  --color-bg-primary: #1a1a1a;
  --color-bg-secondary: #252525;
  --color-bg-tertiary: #2f2f2f;

  --color-border-default: #333333;
  --color-border-subtle: #2a2a2a;

  --color-success: #4ade80;
  --color-warning: #facc15;
  --color-error: #f87171;
  --color-info: #60a5fa;
}

/* ============================================
   BASE STYLES
   ============================================ */

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-family-sans);
  font-size: var(--text-body);
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition:
    background-color var(--duration-normal) ease-in-out,
    color var(--duration-normal) ease-in-out;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-12) var(--space-6);
}

/* ============================================
   HEADER
   ============================================ */

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  padding-bottom: var(--space-10);
  border-bottom: 1px solid var(--color-border-default);
  margin-bottom: var(--space-12);
  flex-wrap: wrap;
}

.header-brand {
  flex: 1;
  min-width: 200px;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.ascii-logo {
  font-size: clamp(3px, 1.3vw, 0.5rem);
  line-height: 1.2;
  color: var(--color-brand-primary);
  margin: 0;
  white-space: pre;
  font-family: var(--font-family-mono);
  overflow: hidden;
}

.header-subtitle {
  font-size: var(--text-label);
  font-weight: 500;
  color: var(--color-text-secondary);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin: 0;
  padding-left: 2px;
}

.theme-toggle {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border-default);
  color: var(--color-text-primary);
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 1.25rem;
  transition:
    background-color var(--duration-instant) ease-out,
    border-color var(--duration-instant) ease-out;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.theme-toggle:hover {
  background: var(--color-bg-tertiary);
  border-color: var(--color-brand-primary);
}

.theme-toggle:active {
  transform: scale(0.96);
}

/* ============================================
   SECTIONS
   ============================================ */

section {
  margin-bottom: var(--space-12);
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: var(--space-6);
  flex-wrap: wrap;
  gap: var(--space-3);
}

.section-header h2 {
  font-size: var(--text-h2);
  font-weight: 600;
  color: var(--color-text-primary);
  letter-spacing: -0.01em;
}

.section-label {
  font-size: var(--text-label);
  font-weight: 500;
  color: var(--color-text-secondary);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--space-1);
}

.last-updated {
  color: var(--color-text-tertiary);
  font-size: var(--text-caption);
}

/* ============================================
   STATS GRID
   ============================================ */

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

.stat-card {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border-default);
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  transition:
    border-color var(--duration-instant) ease-out,
    box-shadow var(--duration-instant) ease-out;
}

.stat-card:hover {
  border-color: var(--color-border-default);
  box-shadow: var(--shadow-sm);
}

.stat-card.primary {
  border-color: var(--color-brand-primary);
  background: var(--color-brand-primary-subtle);
}

.stat-card.primary:hover {
  border-color: var(--color-brand-primary);
}

.stat-card.highlight {
  border-color: var(--color-brand-primary);
  background: var(--color-brand-primary-subtle);
}

.stat-label {
  font-size: var(--text-label);
  font-weight: 500;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.arrow {
  color: var(--color-brand-primary);
  font-size: var(--text-label);
}

.stat-value {
  font-size: var(--text-display);
  font-weight: 600;
  color: var(--color-text-primary);
  line-height: 1.2;
  margin-bottom: var(--space-1);
}

.stat-sub {
  font-size: var(--text-caption);
  color: var(--color-text-secondary);
}

/* ============================================
   ACTIVITY HEATMAP
   ============================================ */

.heatmap-section {
  margin-bottom: var(--space-12);
}

.heatmap-legend {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-label);
  color: var(--color-text-tertiary);
}

.legend-items {
  display: flex;
  gap: 3px;
}

.legend-label {
  font-size: var(--text-label);
}

.legend-box {
  width: 12px;
  height: 12px;
  border-radius: 2px;
  border: 1px solid var(--color-border-subtle);
}

.legend-box.level-0 {
  background: var(--color-bg-secondary);
}

.legend-box.level-1 {
  background: color-mix(in srgb, var(--color-brand-primary) 25%, var(--color-bg-secondary));
}

.legend-box.level-2 {
  background: color-mix(in srgb, var(--color-brand-primary) 50%, var(--color-bg-secondary));
}

.legend-box.level-3 {
  background: color-mix(in srgb, var(--color-brand-primary) 75%, var(--color-bg-secondary));
}

.legend-box.level-4 {
  background: var(--color-brand-primary);
}

.heatmap-container {
  position: relative;
  overflow-x: auto;
  padding: var(--space-4) 0;
}

.heatmap-months {
  display: flex;
  gap: 0;
  margin-bottom: var(--space-2);
  margin-left: 30px;
  font-size: var(--text-label);
  color: var(--color-text-tertiary);
  font-family: var(--font-family-sans);
}

.heatmap-month {
  width: calc(12px + 3px);
  flex-shrink: 0;
}

.heatmap-grid {
  display: grid;
  grid-template-rows: repeat(7, 12px);
  grid-auto-flow: column;
  grid-auto-columns: 12px;
  gap: 3px;
  margin-left: 30px;
}

.heatmap-day-labels {
  position: absolute;
  left: 0;
  top: 50px;
  display: flex;
  flex-direction: column;
  gap: 3px;
  font-size: var(--text-label);
  color: var(--color-text-tertiary);
  font-family: var(--font-family-sans);
}

.heatmap-day-label {
  height: 12px;
  line-height: 12px;
}

.heatmap-cell {
  width: 12px;
  height: 12px;
  border-radius: 2px;
  border: 1px solid var(--color-border-subtle);
  background: var(--color-bg-secondary);
  cursor: pointer;
  transition: transform var(--duration-instant) ease-out;
  position: relative;
}

.heatmap-cell:hover {
  transform: scale(1.3);
  z-index: 10;
  border-color: var(--color-brand-primary);
}

.heatmap-tooltip {
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border-default);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  font-size: var(--text-caption);
  font-family: var(--font-family-sans);
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--duration-fast) ease-out;
  z-index: 100;
  margin-bottom: 5px;
  color: var(--color-text-primary);
}

.heatmap-cell:hover .heatmap-tooltip {
  opacity: 1;
}

/* ============================================
   RECENT ACTIVITY
   ============================================ */

.pagination-controls {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.pagination-btn {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border-default);
  color: var(--color-text-primary);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-family: var(--font-family-sans);
  font-size: var(--text-caption);
  font-weight: 500;
  transition:
    background-color var(--duration-instant) ease-out,
    border-color var(--duration-instant) ease-out,
    box-shadow var(--duration-instant) ease-out;
  min-height: 44px;
  box-shadow: var(--shadow-sm);
}

.pagination-btn:hover:not(:disabled) {
  border-color: var(--color-brand-primary);
  background: var(--color-bg-tertiary);
}

.pagination-btn:active:not(:disabled) {
  transform: scale(0.97);
}

.pagination-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.pagination-info {
  font-size: var(--text-caption);
  color: var(--color-text-tertiary);
}

.activity-list {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.activity-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border-subtle);
  transition: background-color var(--duration-instant) ease-out;
}

.activity-item:last-child {
  border-bottom: none;
}

.activity-item:hover {
  background: var(--color-bg-tertiary);
}

.activity-date {
  color: var(--color-text-primary);
  font-weight: 600;
  font-size: var(--text-body-sm);
  min-width: 120px;
}

.activity-stats {
  display: flex;
  gap: var(--space-8);
  flex-wrap: wrap;
}

.activity-stat {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.activity-stat-label {
  font-size: var(--text-label);
  font-weight: 500;
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.activity-stat-value {
  color: var(--color-text-primary);
  font-weight: 600;
  font-size: var(--text-body-sm);
}

.loading {
  padding: var(--space-10);
  text-align: center;
  color: var(--color-text-tertiary);
  font-size: var(--text-body-sm);
}

/* ============================================
   SOCIAL LINKS
   ============================================ */

.social-links {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.social-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  text-decoration: none;
  font-size: var(--text-body-sm);
  font-weight: 500;
  transition:
    border-color var(--duration-instant) ease-out,
    background-color var(--duration-instant) ease-out;
}

.social-link:hover {
  border-color: var(--color-brand-primary);
  background: var(--color-bg-tertiary);
}

.social-link:active {
  transform: scale(0.98);
}

.social-icon {
  color: var(--color-brand-primary);
  font-size: var(--text-body);
}

/* ============================================
   FOOTER
   ============================================ */

footer {
  margin-top: var(--space-16);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border-default);
}

.footer-text {
  text-align: center;
  color: var(--color-text-tertiary);
  font-size: var(--text-caption);
}

.footer-text a {
  color: var(--color-brand-primary);
  text-decoration: none;
  transition: color var(--duration-instant) ease-out;
}

.footer-text a:hover {
  color: var(--color-brand-primary-hover);
  text-decoration: underline;
}

/* ============================================
   RESPONSIVE: TABLET (640px - 1023px)
   ============================================ */

@media (max-width: 1023px) {
  .container {
    padding: var(--space-8) var(--space-5);
  }

  .stats-grid {
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  }
}

/* ============================================
   RESPONSIVE: MOBILE (< 640px)
   ============================================ */

@media (max-width: 639px) {
  .container {
    padding: var(--space-5) var(--space-4);
  }

  header {
    gap: var(--space-4);
    padding-bottom: var(--space-6);
    margin-bottom: var(--space-8);
  }

  .header-subtitle {
    font-size: var(--text-label);
  }

  section {
    margin-bottom: var(--space-8);
  }

  .section-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
  }

  .section-header h2 {
    font-size: var(--text-h3);
  }

  .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3);
  }

  .stat-card {
    padding: var(--space-4);
  }

  .stat-value {
    font-size: var(--text-h1);
  }

  .activity-item {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
    padding: var(--space-4);
  }

  .activity-stats {
    width: 100%;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3);
  }

  .heatmap-legend {
    font-size: var(--text-label);
  }

  .legend-box {
    width: 10px;
    height: 10px;
  }

  .heatmap-cell {
    width: 10px;
    height: 10px;
  }

  .heatmap-day-label {
    height: 10px;
    line-height: 10px;
    font-size: var(--text-label);
  }

  .social-links {
    flex-direction: column;
  }

  .social-link {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 400px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .stat-value {
    font-size: var(--text-h2);
  }
}

/* ============================================
   FOCUS STYLES (WCAG 2.4.7)
   ============================================ */

:focus-visible {
  outline: 2px solid var(--color-brand-primary);
  outline-offset: 2px;
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--color-brand-primary);
  outline-offset: 2px;
}

.pagination-btn:focus-visible {
  outline: 2px solid var(--color-brand-primary);
  outline-offset: 2px;
}

.social-link:focus-visible {
  outline: 2px solid var(--color-brand-primary);
  outline-offset: 2px;
}

.heatmap-cell:focus-visible {
  outline: 2px solid var(--color-brand-primary);
  outline-offset: 1px;
  z-index: 10;
}

/* ============================================
   REDUCED MOTION
   ============================================ */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    /* biome-ignore lint/complexity/noImportantStyles: intentional per WCAG — must override all transitions for reduced-motion */
    transition-duration: 0s !important;
    /* biome-ignore lint/complexity/noImportantStyles: intentional per WCAG — must override all animations for reduced-motion */
    animation-duration: 0s !important;
  }
}