/* ==========================================================================
   நாலடியார் · Nālaṭiyār — Aged Copper & Forest Green Theme
   400 Jain wisdom-quatrains · 40 chapters · c. 300–500 CE

   Visual identity: aged copper, deep forest green, dark palm-leaf brown.
   The Nālaṭiyār is the Tamil anthology of ethical and philosophical verse —
   sober, aphoristic, and burnished with the weight of hard-won understanding.
   Where the Sangam anthologies sing of love and war, the Nālaṭiyār instructs:
   on impermanence, on the value of good character, on the learned life.

   The palette draws on temple copper-plate inscriptions, the Jain monk's robe,
   the banyan tree's shadow, and the dark rich surface of a palm-leaf manuscript
   that has been read for centuries. Not gold (that is Thiruppāvai's domain) but
   copper: older, darker, more austere.
   ========================================================================== */

/* ---------------------------------------------------------------------------
   Colour tokens
   --------------------------------------------------------------------------- */
:root {
  --nl-copper:        #7a3e1a;   /* aged copper — primary accent */
  --nl-copper-mid:    #9a5228;   /* mid copper */
  --nl-copper-bright: #b86830;   /* bright copper */
  --nl-copper-pale:   rgba(122,62,26,0.10);
  --nl-forest:        #1e4a28;   /* deep forest green */
  --nl-forest-mid:    #2a5e34;   /* mid forest */
  --nl-forest-pale:   rgba(30,74,40,0.10);
  --nl-bark:          #3a2510;   /* dark bark brown */
  --nl-bark-pale:     rgba(58,37,16,0.08);
  --nl-sage:          #5a7a52;   /* sage — muted wisdom-green */
  --nl-sage-pale:     rgba(90,122,82,0.12);
  --nl-ochre:         #c8922a;   /* warm ochre — chapter headings */

  /* Chapter iyal group colours — 4 groups of 10 chapters */
  --nl-iyal1: #1e4a28;   /* Iyal 1 (ch 1–10)  — forest depth */
  --nl-iyal2: #7a3e1a;   /* Iyal 2 (ch 11–20) — copper warmth */
  --nl-iyal3: #2a4868;   /* Iyal 3 (ch 21–30) — river slate */
  --nl-iyal4: #5a3a18;   /* Iyal 4 (ch 31–40) — dark bark */

  /* Override site palette */
  --accent-vermillion: var(--nl-copper);
  --accent-kumkum:     var(--nl-copper-mid);
  --accent-ochre:      var(--nl-ochre);
  --accent-gold:       var(--nl-copper);
}

/* ---------------------------------------------------------------------------
   Background: deep palm-leaf, slightly darker and greener than base
   --------------------------------------------------------------------------- */
body {
  background: #c4b898;
}
body::before {
  background-image:
    repeating-linear-gradient(
      0deg,
      transparent 0px, transparent 3px,
      rgba(58,37,16,0.03) 3px, rgba(58,37,16,0.03) 4px
    ),
    repeating-linear-gradient(
      0deg,
      transparent 0px, transparent 60px,
      rgba(58,37,16,0.05) 60px, rgba(58,37,16,0.05) 61px,
      transparent 61px, transparent 140px,
      rgba(58,37,16,0.03) 140px, rgba(58,37,16,0.03) 142px
    ),
    url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0.23 0 0 0 0 0.15 0 0 0 0 0.06 0 0 0 0.13 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---------------------------------------------------------------------------
   Header & nav
   --------------------------------------------------------------------------- */
.site-header { border-bottom-color: rgba(122,62,26,0.35); }
.site-logo .mark { color: var(--nl-copper); }
.wordmark-tamil { color: var(--nl-copper); }
.site-nav a { color: var(--nl-forest); }
.site-nav a:hover { color: var(--nl-copper); }
a { color: var(--nl-copper); }
a:hover { color: var(--nl-copper-mid); }

/* ---------------------------------------------------------------------------
   Chapter grid (index page)
   --------------------------------------------------------------------------- */
.nl-chapter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
  max-width: 1060px;
  margin: 0 auto;
  padding: 0 1.5rem 3rem;
}

.nl-chapter-card {
  display: block;
  background: var(--bg-paper);
  background-image: repeating-linear-gradient(0deg,
    rgba(58,37,16,0.025) 0px, rgba(58,37,16,0.025) 1px,
    transparent 1px, transparent 8px);
  border: 1px solid rgba(122,62,26,0.28);
  border-radius: 4px;
  padding: 1.25rem 1.5rem;
  text-decoration: none;
  color: inherit;
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
  box-shadow: 0 1px 3px rgba(58,37,16,0.09);
  position: relative;
  overflow: hidden;
  border-left: 4px solid transparent;
}
.nl-chapter-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 4px 16px rgba(58,37,16,0.15);
  border-color: rgba(122,62,26,0.5);
}
/* Iyal group left-border colours */
.nl-chapter-card[data-iyal="1"] { border-left-color: var(--nl-iyal1); }
.nl-chapter-card[data-iyal="2"] { border-left-color: var(--nl-iyal2); }
.nl-chapter-card[data-iyal="3"] { border-left-color: var(--nl-iyal3); }
.nl-chapter-card[data-iyal="4"] { border-left-color: var(--nl-iyal4); }

.nl-card-num {
  font-family: var(--font-display);
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--nl-copper-mid);
  margin-bottom: 0.35rem;
}
.nl-card-title-tamil {
  font-family: var(--font-tamil);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--ink-primary);
  margin-bottom: 0.15rem;
  line-height: 1.3;
}
.nl-card-title-eng {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 0.9rem;
  color: var(--nl-copper-mid);
  margin-bottom: 0.5rem;
}
.nl-card-desc {
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--ink-secondary);
  margin-bottom: 0.6rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.nl-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border-subtle);
}
.nl-card-verse-count {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--ink-muted);
}
.nl-card-iyal-badge {
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: 0.15rem 0.55rem;
  border-radius: 2px;
  color: white;
  font-weight: 600;
}
.nl-card-iyal-badge[data-iyal="1"] { background: var(--nl-iyal1); }
.nl-card-iyal-badge[data-iyal="2"] { background: var(--nl-iyal2); }
.nl-card-iyal-badge[data-iyal="3"] { background: var(--nl-iyal3); }
.nl-card-iyal-badge[data-iyal="4"] { background: var(--nl-iyal4); }
.nl-card-arrow {
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--nl-copper);
  opacity: 0;
  transition: opacity 0.2s ease;
}
.nl-chapter-card:hover .nl-card-arrow { opacity: 0.6; }

/* Iyal section dividers */
.nl-iyal-header {
  max-width: 1060px;
  margin: 2.5rem auto 1rem;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}
.nl-iyal-line {
  flex: 1;
  height: 1px;
  background: rgba(122,62,26,0.2);
}
.nl-iyal-label {
  font-family: var(--font-display);
  font-size: 0.72rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--nl-copper-mid);
  white-space: nowrap;
}

/* ---------------------------------------------------------------------------
   Chapter detail page — poem list
   --------------------------------------------------------------------------- */
.nl-chapter-banner {
  padding: 1.25rem 1.75rem;
  border-radius: 4px;
  margin-bottom: 1.5rem;
  color: white;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}
.nl-chapter-banner[data-iyal="1"] { background: linear-gradient(135deg, #1e4a28, #153818); }
.nl-chapter-banner[data-iyal="2"] { background: linear-gradient(135deg, #7a3e1a, #5a2e10); }
.nl-chapter-banner[data-iyal="3"] { background: linear-gradient(135deg, #2a4868, #1a3858); }
.nl-chapter-banner[data-iyal="4"] { background: linear-gradient(135deg, #5a3a18, #3a2008); }

.nl-banner-num {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1;
  opacity: 0.8;
  min-width: 2.5rem;
}
.nl-banner-content { flex: 1; }
.nl-banner-title-tamil {
  font-family: var(--font-tamil);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 0.2rem;
}
.nl-banner-title-eng {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.05rem;
  opacity: 0.85;
}
.nl-banner-desc {
  margin-top: 0.5rem;
  font-size: 0.88rem;
  opacity: 0.75;
  line-height: 1.5;
}

/* Individual verse cards on chapter page */
.nl-verse-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}
.nl-verse-card {
  background: var(--bg-paper);
  background-image: repeating-linear-gradient(0deg,
    rgba(58,37,16,0.02) 0px, rgba(58,37,16,0.02) 1px,
    transparent 1px, transparent 8px);
  border: 1px solid rgba(122,62,26,0.3);
  border-radius: 4px;
  padding: 2rem 2.5rem 1.75rem;
  box-shadow: 0 1px 4px rgba(58,37,16,0.08), 0 4px 18px rgba(58,37,16,0.08);
  position: relative;
}
.nl-verse-card::before, .nl-verse-card::after {
  content: '';
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 1.5px solid rgba(122,62,26,0.45);
}
.nl-verse-card::before { left: 12px; }
.nl-verse-card::after  { right: 12px; }

.nl-verse-num {
  font-family: var(--font-display);
  font-size: 0.7rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--nl-copper);
  margin-bottom: 0.85rem;
  text-align: center;
}
.nl-verse-num .num-big {
  font-size: 1.3rem;
  letter-spacing: 0;
  font-weight: 700;
  margin: 0 0.4em;
  vertical-align: middle;
}

.nl-layer-label {
  font-family: var(--font-display);
  font-size: 0.68rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--nl-copper);
  margin-bottom: 0.7rem;
  font-weight: 500;
}
.nl-verse-layer {
  margin-bottom: 1.75rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--border-subtle);
}
.nl-verse-layer:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.nl-tamil-text {
  font-family: var(--font-tamil);
  font-size: 1.35rem;
  line-height: 1.9;
  color: var(--ink-primary);
  font-weight: 500;
  white-space: pre-line;
}
.nl-translit-text {
  font-family: var(--font-body);
  font-style: italic;
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--ink-secondary);
  white-space: pre-line;
}
.nl-english-text {
  font-family: var(--font-display);
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--ink-primary);
  white-space: pre-line;
}
.nl-urai-text {
  font-family: var(--font-tamil);
  font-size: 0.98rem;
  line-height: 1.9;
  color: var(--ink-secondary);
}
.nl-alt-text {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--ink-secondary);
  white-space: pre-line;
}
.nl-note {
  background: var(--nl-forest-pale);
  border-left: 3px solid var(--nl-forest);
  padding: 0.9rem 1.1rem;
  border-radius: 2px;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--ink-secondary);
}

/* Chapter navigation */
.nl-chapter-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 2rem;
}
.nl-nav-link {
  display: block;
  padding: 1.1rem 1.4rem;
  background: var(--bg-paper);
  border: 1px solid rgba(122,62,26,0.25);
  border-radius: 4px;
  text-decoration: none;
  color: inherit;
  transition: all 0.2s ease;
}
.nl-nav-link:hover {
  border-color: var(--nl-copper);
  transform: translateY(-2px);
  box-shadow: 0 3px 10px rgba(58,37,16,0.12);
}
.nl-nav-link.next { text-align: right; }
.nl-nav-link.disabled { opacity: 0.3; pointer-events: none; }
.nl-nav-dir {
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-bottom: 0.25rem;
  font-family: var(--font-display);
}
.nl-nav-title {
  font-family: var(--font-tamil);
  font-size: 1rem;
  color: var(--nl-copper);
  margin-bottom: 0.15rem;
}
.nl-nav-sub {
  font-size: 0.8rem;
  color: var(--ink-muted);
  font-style: italic;
  font-family: var(--font-display);
}

/* ---------------------------------------------------------------------------
   Responsive
   --------------------------------------------------------------------------- */
@media (max-width: 640px) {
  .nl-chapter-grid { grid-template-columns: 1fr; gap: 1rem; }
  .nl-verse-card { padding: 1.5rem 1.1rem; }
  .nl-chapter-nav { grid-template-columns: 1fr; }
  .nl-chapter-banner { flex-direction: column; gap: 0.5rem; align-items: flex-start; }
}

/* ---------------------------------------------------------------------------
   Index page hero extras
   --------------------------------------------------------------------------- */
.nl-stat-row {
  display: flex;
  justify-content: center;
  gap: 2.5rem;
  margin: 2rem auto;
  max-width: 600px;
  flex-wrap: wrap;
}
.nl-stat { text-align: center; }
.nl-stat-num {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--nl-copper);
  line-height: 1;
  margin-bottom: 0.25rem;
}
.nl-stat-label {
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

/* Divider */
.nl-divider {
  text-align: center;
  color: var(--nl-copper);
  opacity: 0.4;
  letter-spacing: 1.5em;
  padding-left: 1.5em;
  margin: 2rem 0;
}