/* ============================================================
   GitaDiff Dashboard — Dark Theme Stylesheet
   Comparing 1972 & 1983 Editions of Bhagavad-gita As It Is
   ============================================================ */

/* ----- CSS Custom Properties ----- */
:root {
  /* Surfaces */
  --bg:              #0f0f14;
  --surface:         #1a1a24;
  --surface-elevated:#22222e;
  --border:          #2a2a3a;

  /* Text */
  --text-primary:    #e8e6e3;
  --text-secondary:  #9a98a0;
  --text-muted:      #5e5c64;

  /* Accents */
  --accent:          #f0a030;
  --accent-dim:      rgba(240, 160, 48, 0.15);
  --accent-hover:    #f5b54a;

  /* Severity */
  --critical:        #e74c3c;
  --critical-dim:    rgba(231, 76, 60, 0.15);
  --significant:     #f39c12;
  --significant-dim: rgba(243, 156, 18, 0.15);
  --minor:           #3498db;
  --minor-dim:       rgba(52, 152, 219, 0.15);
  --success:         #2ecc71;
  --success-dim:     rgba(46, 204, 113, 0.15);

  /* Layout */
  --nav-height:      56px;
  --max-width:       1400px;
  --radius:          8px;
  --radius-sm:       4px;
  --radius-lg:       12px;

  /* Transitions */
  --transition:      0.2s ease;
  --transition-slow: 0.35s ease;

  /* Font stack */
  --font-sans:       'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI',
                     Roboto, Oxygen, Ubuntu, Cantarell, 'Helvetica Neue',
                     sans-serif;
  --font-mono:       'JetBrains Mono', 'Fira Code', 'SF Mono', Consolas,
                     'Liberation Mono', Menlo, monospace;
}


/* ----- Reset & Base ----- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--accent-hover);
}

img {
  max-width: 100%;
  display: block;
}


/* ----- Typography ----- */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
  line-height: 1.3;
  font-weight: 600;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.1rem; }

.text-secondary { color: var(--text-secondary); }
.text-muted     { color: var(--text-muted); }
.text-accent    { color: var(--accent); }
.text-center    { text-align: center; }


/* ============================================================
   NAVIGATION
   ============================================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: rgba(15, 15, 20, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 1.5rem;
}

.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
}

.navbar__logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.navbar__logo-mark {
  color: var(--accent);
  font-weight: 800;
}

.navbar__logo-sub {
  font-size: 0.7rem;
  font-weight: 400;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-left: 0.25rem;
  display: none;
}

@media (min-width: 768px) {
  .navbar__logo-sub { display: inline; }
}

.navbar__version {
  font-size: 0.6rem;
  font-weight: 600;
  color: var(--accent);
  background: rgba(240, 160, 48, 0.12);
  padding: 0.1em 0.4em;
  border-radius: 4px;
  margin-left: 0.5rem;
  letter-spacing: 0.04em;
  vertical-align: middle;
}

.navbar__links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
}

.navbar__links a {
  display: block;
  padding: 0.4rem 0.75rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.navbar__links a:hover {
  color: var(--text-primary);
  background: var(--surface);
}

.navbar__links a.active {
  color: var(--accent);
  background: var(--accent-dim);
}

/* Mobile nav toggle */
.navbar__toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.25rem;
}

@media (max-width: 768px) {
  .navbar__toggle { display: block; }

  .navbar__links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 0.5rem;
  }

  .navbar__links.open { display: flex; }

  .navbar__links a {
    width: 100%;
    padding: 0.75rem 1rem;
  }
}


/* ============================================================
   LAYOUT
   ============================================================ */
.main-content {
  margin-top: var(--nav-height);
  padding: 2rem 1.5rem 4rem;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
}

.section {
  margin-bottom: 3rem;
}

.section__header {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}

.section__title {
  font-size: 1.35rem;
  font-weight: 600;
}

.section__subtitle {
  font-size: 0.85rem;
  color: var(--text-secondary);
}


/* ============================================================
   GRID UTILITIES
   ============================================================ */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.grid-4 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 480px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

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


/* ============================================================
   CARDS
   ============================================================ */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.card:hover {
  border-color: rgba(240, 160, 48, 0.25);
  box-shadow: 0 0 20px rgba(240, 160, 48, 0.06);
}

.card--clickable {
  cursor: pointer;
}

.card--clickable:hover {
  border-color: rgba(240, 160, 48, 0.4);
  box-shadow: 0 0 24px rgba(240, 160, 48, 0.1);
}


/* ----- Stat Cards (Hero) ----- */
.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  transition: border-color var(--transition), box-shadow var(--transition),
              transform var(--transition);
}

.stat-card:hover {
  border-color: rgba(240, 160, 48, 0.25);
  box-shadow: 0 0 20px rgba(240, 160, 48, 0.06);
  transform: translateY(-2px);
}

.stat-card__label {
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
}

.stat-card__value {
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--text-primary);
}

.stat-card__detail {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.stat-card--critical .stat-card__value { color: var(--critical); }
.stat-card--significant .stat-card__value { color: var(--significant); }
.stat-card--minor .stat-card__value { color: var(--minor); }
.stat-card--accent .stat-card__value { color: var(--accent); }


/* ============================================================
   CHART CONTAINERS
   ============================================================ */
.chart-container {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  position: relative;
}

.chart-container__title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.chart-container canvas {
  width: 100% !important;
}


/* ============================================================
   SEVERITY BADGES
   ============================================================ */
.severity-critical {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.6rem;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-radius: 9999px;
  background: var(--critical-dim);
  color: var(--critical);
  border: 1px solid rgba(231, 76, 60, 0.3);
}

.severity-significant {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.6rem;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-radius: 9999px;
  background: var(--significant-dim);
  color: var(--significant);
  border: 1px solid rgba(243, 156, 18, 0.3);
}

.severity-minor {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.6rem;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-radius: 9999px;
  background: var(--minor-dim);
  color: var(--minor);
  border: 1px solid rgba(52, 152, 219, 0.3);
}


/* ============================================================
   TAGS (pill badges)
   ============================================================ */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.15rem 0.5rem;
  font-size: 0.7rem;
  font-weight: 500;
  border-radius: 9999px;
  background: var(--surface-elevated);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  transition: all var(--transition);
}

.tag:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.tag--active {
  background: var(--accent-dim);
  color: var(--accent);
  border-color: rgba(240, 160, 48, 0.3);
}


/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  font-weight: 500;
  font-family: var(--font-sans);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-primary {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
  font-weight: 600;
}

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

.btn-ghost {
  background: transparent;
  border-color: transparent;
  color: var(--text-secondary);
}

.btn-ghost:hover {
  background: var(--surface);
  color: var(--text-primary);
}

.btn-sm {
  padding: 0.3rem 0.65rem;
  font-size: 0.75rem;
}


/* ============================================================
   SEARCH BOX
   ============================================================ */
.search-box {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.5rem 0.85rem;
  transition: border-color var(--transition);
}

.search-box:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}

.search-box__icon {
  color: var(--text-muted);
  font-size: 0.9rem;
  flex-shrink: 0;
}

.search-box__input {
  flex: 1;
  border: none;
  background: transparent;
  color: var(--text-primary);
  font-size: 0.85rem;
  font-family: var(--font-sans);
  outline: none;
}

.search-box__input::placeholder {
  color: var(--text-muted);
}


/* ============================================================
   FILTER PANEL (sidebar)
   ============================================================ */
.filter-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.filter-panel__section {
  margin-bottom: 1.25rem;
}

.filter-panel__section:last-child {
  margin-bottom: 0;
}

.filter-panel__label {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.filter-panel__options {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}


/* ============================================================
   VERSE REFERENCE
   ============================================================ */
.verse-ref {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
  letter-spacing: 0.02em;
  white-space: nowrap;
}


/* ============================================================
   EDITION TEXT BLOCKS
   ============================================================ */
.text-1972,
.text-1983 {
  position: relative;
  padding: 1rem 1.25rem;
  margin: 0.75rem 0;
  border-radius: var(--radius);
  font-size: 0.9rem;
  line-height: 1.7;
  border-left: 3px solid;
}

.text-1972 {
  background: rgba(231, 76, 60, 0.06);
  border-left-color: var(--critical);
  color: var(--text-primary);
}

.text-1972::before {
  content: '1972';
  position: absolute;
  top: 0.5rem;
  right: 0.75rem;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--critical);
  opacity: 0.6;
}

.text-1983 {
  background: rgba(46, 204, 113, 0.06);
  border-left-color: var(--success);
  color: var(--text-primary);
}

.text-1983::before {
  content: '1983';
  position: absolute;
  top: 0.5rem;
  right: 0.75rem;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--success);
  opacity: 0.6;
}


/* ============================================================
   DIFF HIGHLIGHTING
   ============================================================ */
.diff-added {
  background: rgba(46, 204, 113, 0.2);
  color: var(--success);
  padding: 0.1rem 0.2rem;
  border-radius: 2px;
}

.diff-removed {
  background: rgba(231, 76, 60, 0.2);
  color: var(--critical);
  text-decoration: line-through;
  padding: 0.1rem 0.2rem;
  border-radius: 2px;
}

.diff-changed {
  background: rgba(243, 156, 18, 0.2);
  color: var(--significant);
  padding: 0.1rem 0.2rem;
  border-radius: 2px;
}


/* ============================================================
   VERSE CARD (top-10 / change list)
   ============================================================ */
.verse-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transition: border-color var(--transition), box-shadow var(--transition),
              transform var(--transition);
}

.verse-card:hover {
  border-color: rgba(240, 160, 48, 0.3);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  transform: translateY(-1px);
}

.verse-card__header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.verse-card__rank {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-muted);
  min-width: 1.5rem;
}

.verse-card__title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  flex: 1;
}

.verse-card__section {
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  background: var(--surface-elevated);
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-sm);
}

.verse-card__desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.verse-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 0.25rem;
}


/* ============================================================
   HERO SECTION
   ============================================================ */
.hero {
  text-align: center;
  margin-bottom: 2.5rem;
  padding: 1.5rem 0 0;
}

.hero__title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.hero__title span {
  color: var(--accent);
}

.hero__desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 2rem;
}


/* ============================================================
   LOADING & ERROR STATES
   ============================================================ */
.loading-msg {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 3rem 1rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.loading-msg__spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.error-msg {
  padding: 1.5rem;
  background: var(--critical-dim);
  border: 1px solid rgba(231, 76, 60, 0.3);
  border-radius: var(--radius);
  color: var(--critical);
  font-size: 0.9rem;
  text-align: center;
}


/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 1.5rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8rem;
}

.site-footer a {
  color: var(--text-secondary);
}

.site-footer a:hover {
  color: var(--accent);
}


/* ============================================================
   SCROLLBAR (webkit)
   ============================================================ */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg);
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}


/* ============================================================
   UTILITY CLASSES
   ============================================================ */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.flex { display: flex; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-sm { gap: 0.5rem; }
.gap-md { gap: 1rem; }
.gap-lg { gap: 1.5rem; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }


/* ============================================================
   RESPONSIVE ADJUSTMENTS
   ============================================================ */
@media (max-width: 768px) {
  .main-content {
    padding: 1.25rem 1rem 3rem;
  }

  .hero__title {
    font-size: 1.35rem;
  }

  .stat-card__value {
    font-size: 1.75rem;
  }

  .section__header {
    flex-direction: column;
    gap: 0.25rem;
  }

  h2 { font-size: 1.25rem; }
}

@media (max-width: 480px) {
  .main-content {
    padding: 1rem 0.75rem 2rem;
  }

  .hero__title {
    font-size: 1.15rem;
  }

  .stat-card__value {
    font-size: 1.5rem;
  }

  .stat-card {
    padding: 1rem;
  }

  .card {
    padding: 1rem;
  }

  .chart-container {
    padding: 1rem;
  }
}