/* ─── Kaʿbah Evolution · stylesheet ─────────────────────────── */

:root {
  /* Warm parchment palette */
  --bg:        #f3e9d2;          /* page background, soft parchment */
  --bg-deep:   #ecdfc0;          /* alt section */
  --surface:   #fbf5e6;          /* raised card */
  --surface-2: #f7eed7;
  --ink:       #2a1f15;          /* primary text */
  --ink-soft:  #5b4a37;          /* secondary text */
  --ink-mute:  #8a7a62;          /* tertiary / labels */
  --rule:      #d9c9a4;          /* borders / dividers */
  --rule-soft: #e6d8b7;

  /* Accents */
  --teal:      #1f5a52;          /* primary accent — deep mihrab green */
  --teal-soft: #3d8077;
  --gold:      #b07a30;          /* secondary — warm gold */
  --gold-soft: #d8a85a;
  --terra:     #a64b2a;          /* tertiary — terracotta for stone */
  --stone:     #8e7c61;          /* the kaabah stone color */
  --stone-dk:  #5d4c36;
  --kiswah:    #1a1410;          /* black kiswah */

  /* Type */
  --serif:  "Newsreader", "Source Serif Pro", Georgia, serif;
  --sans:   "Manrope", ui-sans-serif, system-ui, -apple-system, sans-serif;
  --arabic: "Amiri", "Scheherazade New", serif;
  --mono:   "JetBrains Mono", ui-monospace, "SF Mono", monospace;
}

/* ─── Base ───────────────────────────────────────────────── */

* { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body {
  background:
    radial-gradient(1200px 700px at 80% -10%, rgba(176,122,48,0.10), transparent 60%),
    radial-gradient(900px 600px at -10% 20%, rgba(31,90,82,0.08), transparent 60%),
    var(--bg);
  min-height: 100vh;
}

a { color: inherit; }

/* ─── Layout ────────────────────────────────────────────── */

.page {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 32px 160px;
}

/* ─── Hero ──────────────────────────────────────────────── */

.hero {
  padding: 90px 0 60px;
  position: relative;
  border-bottom: 1px solid var(--rule);
}
.hero__eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 24px;
  display: flex; align-items: center; gap: 12px;
}
.hero__eyebrow .dot {
  width: 6px; height: 6px; border-radius: 50%; background: var(--gold);
}
.hero__title {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(48px, 8vw, 96px);
  line-height: 0.98;
  letter-spacing: -0.025em;
  margin: 0 0 24px;
  color: var(--ink);
  max-width: 14ch;
}
.hero__title em {
  font-style: italic;
  color: var(--teal);
}
.hero__arabic {
  font-family: var(--arabic);
  font-size: clamp(32px, 4vw, 48px);
  color: var(--teal);
  margin-bottom: 28px;
  direction: rtl;
}
.hero__lede {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 21px;
  line-height: 1.55;
  color: var(--ink-soft);
  max-width: 64ch;
  margin: 0 0 40px;
}
.hero__meta {
  display: flex; flex-wrap: wrap; gap: 32px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-mute);
}
.hero__meta strong { color: var(--ink); font-weight: 500; }

/* ─── Sticky timeline rail ──────────────────────────────── */

.rail {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(243, 233, 210, 0.92);
  -webkit-backdrop-filter: blur(12px) saturate(140%);
  backdrop-filter: blur(12px) saturate(140%);
  border-bottom: 1px solid var(--rule);
  padding: 16px 0 14px;
  margin: 0 -32px;
  padding-left: 32px; padding-right: 32px;
}
.rail__inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 0;
  overflow-x: auto;
  scrollbar-width: none;
}
.rail__inner::-webkit-scrollbar { display: none; }

.rail-node {
  flex: 1 1 0;
  min-width: 110px;
  background: transparent;
  border: none;
  padding: 6px 4px;
  text-align: left;
  cursor: pointer;
  font-family: var(--sans);
  position: relative;
  color: var(--ink-mute);
  transition: color 0.18s ease;
}
.rail-node:hover { color: var(--ink); }
.rail-node.is-active { color: var(--teal); }
.rail-node::before {
  content: "";
  display: block;
  height: 2px;
  background: var(--rule);
  margin-bottom: 10px;
  border-radius: 1px;
  transition: background 0.18s ease;
}
.rail-node.is-active::before { background: var(--teal); }
.rail-node:hover::before { background: var(--gold-soft); }

.rail-node__dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--rule);
  position: absolute;
  top: -3px;
  left: 4px;
  border: 2px solid var(--bg);
  transition: background 0.18s ease, transform 0.18s ease;
}
.rail-node.is-active .rail-node__dot {
  background: var(--teal);
  transform: scale(1.4);
}
.rail-node__date {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 2px;
}
.rail-node__label {
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: -0.005em;
  line-height: 1.25;
}

/* ─── Era section ────────────────────────────────────────── */

.era {
  padding: 96px 0 64px;
  border-bottom: 1px dashed var(--rule);
  position: relative;
  scroll-margin-top: 80px;
}
.era:last-of-type { border-bottom: none; }

.era__head {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 48px;
  margin-bottom: 56px;
  align-items: baseline;
}
.era__index {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
  padding-top: 12px;
  border-top: 1.5px solid var(--gold);
  display: inline-block;
}
.era__head-main {
  display: flex; flex-direction: column; gap: 8px;
}
.era__era-label {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-mute);
}
.era__title {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(36px, 5.5vw, 64px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 4px 0 6px;
  max-width: 18ch;
}
.era__title em { font-style: italic; color: var(--teal); }
.era__dates {
  display: flex; gap: 24px; flex-wrap: wrap;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  margin-top: 4px;
}
.era__dates span strong { color: var(--ink); font-weight: 500; }
.era__builder {
  font-family: var(--serif);
  font-style: italic;
  font-size: 19px;
  color: var(--ink-soft);
  margin-top: 8px;
  max-width: 60ch;
}

/* Body grid */
.era__body {
  display: flex;
  flex-direction: column;
  gap: 56px;
}
.era__top {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: start;
}
.era__bottom {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: start;
}
.era__full {
  width: 100%;
}
@media (max-width: 980px) {
  .era__head { grid-template-columns: 1fr; gap: 16px; }
  .era__top, .era__bottom { grid-template-columns: 1fr; gap: 40px; }
}

/* ─── Diagram card ──────────────────────────────────────── */

.diagram-card {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 18px;
  padding: 22px 22px 18px;
  position: sticky;
  top: 88px;
  box-shadow: 0 1px 0 rgba(255,255,255,0.6) inset, 0 6px 24px rgba(120, 90, 40, 0.08);
}

/* ─── Tab toggle inside diagram card ─────────────────────── */
.diagram-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 16px;
  background: var(--surface-2);
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 3px;
}
.diagram-tab {
  flex: 1;
  background: transparent;
  border: 0;
  padding: 8px 12px;
  font-family: var(--sans);
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--ink-mute);
  cursor: pointer;
  border-radius: 999px;
  transition: all 0.18s ease;
}
.diagram-tab:hover { color: var(--ink); }
.diagram-tab.is-active {
  background: var(--surface);
  color: var(--teal);
  box-shadow: 0 1px 3px rgba(120, 90, 40, 0.12);
}
.diagram-tab-panel[hidden] { display: none; }

/* ─── 3D Kaʿbah viewer ───────────────────────────────────── */
.kv {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.kv__viewport {
  position: relative;
  width: 100%;
  height: 420px;
  background:
    radial-gradient(60% 50% at 50% 35%, #fff6df 0%, #f0e2bd 60%, #e6d29a 100%);
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--rule);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.6),
              inset 0 -10px 30px rgba(120, 90, 40, 0.10);
  cursor: grab;
}
.kv__viewport:active { cursor: grabbing; }
.kv__viewport canvas { display: block; }
.kv__placeholder {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 6px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-mute);
}
.kv__placeholder small {
  font-family: var(--sans);
  font-size: 11.5px;
  letter-spacing: 0;
  text-transform: none;
  color: var(--ink-mute);
}

.kv__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.kv__hint {
  display: flex; align-items: center; gap: 8px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-mute);
  line-height: 1.4;
  flex: 1 1 auto;
  min-width: 0;
}
.kv__dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--teal);
  flex: 0 0 auto;
  animation: kv-pulse 2s ease-in-out infinite;
}
@keyframes kv-pulse {
  0%, 100% { opacity: 0.6; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.3); }
}
.kv__controls {
  display: flex;
  gap: 6px;
  flex: 0 0 auto;
}
.kv__btn {
  background: var(--surface-2);
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 6px 12px;
  font-family: var(--sans);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--ink);
  cursor: pointer;
  transition: all 0.15s ease;
}
.kv__btn:hover {
  background: var(--bg);
  border-color: var(--gold-soft);
}
.kv__btn--ar {
  background: var(--teal);
  color: #f8efd5;
  border-color: var(--teal);
}
.kv__btn--ar:hover {
  background: var(--teal-soft);
  border-color: var(--teal-soft);
}
.diagram-card__label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 12px;
}
.diagram-card__svg {
  width: 100%;
  display: block;
}
.diagram-card__views {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  align-items: end;
}
.diagram-card__view-label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-mute);
  text-align: center;
  margin-top: 6px;
}
.diagram-card__legend {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px dashed var(--rule);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 14px;
  font-size: 12px;
  color: var(--ink-soft);
}
.diagram-card__legend .swatch {
  display: inline-block;
  width: 10px; height: 10px;
  border-radius: 2px;
  margin-right: 8px;
  vertical-align: middle;
  border: 1px solid rgba(0,0,0,0.1);
}

/* ─── Detail panels ─────────────────────────────────────── */

.panels { display: flex; flex-direction: column; gap: 36px; }

.panel-title {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
  margin: 0 0 14px;
  display: flex; align-items: center; gap: 10px;
}
.panel-title::before {
  content: ""; width: 14px; height: 1.5px; background: var(--gold);
}

.prose {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 18px;
  line-height: 1.6;
  color: var(--ink);
  margin: 0 0 12px;
  text-wrap: pretty;
}
.prose + .prose { margin-top: 10px; }
.prose em { color: var(--teal); font-style: italic; }

.changes-list {
  margin: 0; padding: 0; list-style: none;
  display: flex; flex-direction: column; gap: 14px;
}
.changes-list--wide {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px 48px;
}
@media (max-width: 780px) {
  .changes-list--wide { grid-template-columns: 1fr; gap: 14px; }
}
.changes-list li {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 14px;
  align-items: start;
  font-size: 15.5px;
  line-height: 1.55;
  color: var(--ink);
}
.changes-list li::before {
  content: attr(data-i);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--gold);
  padding-top: 5px;
  border-top: 1.5px solid var(--gold-soft);
  text-align: left;
}
.changes-list li b { font-weight: 600; color: var(--ink); }
.changes-list__body {
  display: block;
  min-width: 0;
}

/* Dimensions card */
.dim-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  border-radius: 12px;
  overflow: hidden;
}
.dim-grid .cell {
  background: var(--surface);
  padding: 16px 18px;
  display: flex; flex-direction: column; gap: 4px;
}
.dim-grid .cell .k {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-mute);
}
.dim-grid .cell .v {
  font-family: var(--serif);
  font-size: 22px;
  line-height: 1.1;
  color: var(--ink);
  font-weight: 500;
}
.dim-grid .cell .vs {
  font-size: 12.5px;
  color: var(--ink-soft);
  font-family: var(--sans);
}

/* References */
.refs {
  list-style: none;
  margin: 0; padding: 0;
  display: flex; flex-direction: column; gap: 10px;
}
.refs li {
  display: grid;
  grid-template-columns: 70px 1fr;
  gap: 14px;
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.5;
  padding: 8px 0;
  border-bottom: 1px dotted var(--rule);
}
.refs li:last-child { border-bottom: none; }
.refs li .tag {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gold);
  padding-top: 3px;
}
.refs .qtext {
  font-family: var(--arabic);
  font-size: 20px;
  color: var(--teal);
  direction: rtl;
  display: block;
  margin-top: 4px;
  margin-bottom: 6px;
  line-height: 1.6;
}
.refs .qtrans {
  font-family: var(--serif);
  font-style: italic;
  color: var(--ink);
  display: block;
}

/* Why box */
.why {
  background: var(--surface-2);
  border-left: 3px solid var(--teal);
  padding: 18px 22px;
  border-radius: 0 10px 10px 0;
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.55;
  color: var(--ink);
}
.why .why-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--teal);
  margin-bottom: 8px;
  display: block;
}

/* ─── Footer ───────────────────────────────────────────── */
.footer {
  margin-top: 120px;
  padding-top: 40px;
  border-top: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-mute);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

/* ─── Variants ─── */
body.density-compact .era { padding: 72px 0 48px; }
body.density-compact .era__body { gap: 40px; }
body.density-compact .panels { gap: 28px; }
body.density-compact .prose { font-size: 16.5px; }

body.theme-night {
  --bg:        #1a1611;
  --bg-deep:   #221d16;
  --surface:   #25201a;
  --surface-2: #2c2620;
  --ink:       #f3e9d2;
  --ink-soft:  #d6c5a3;
  --ink-mute:  #a08e6f;
  --rule:      #3a3225;
  --rule-soft: #2e271d;
  --teal:      #5fb6a5;
  --teal-soft: #7fc8b8;
  --gold:      #d8a85a;
  --gold-soft: #e7c075;
}
body.theme-night {
  background:
    radial-gradient(1200px 700px at 80% -10%, rgba(216,168,90,0.12), transparent 60%),
    radial-gradient(900px 600px at -10% 20%, rgba(95,182,165,0.10), transparent 60%),
    var(--bg);
}

body.theme-stone {
  --bg:        #e8e2d4;
  --bg-deep:   #ddd5c2;
  --surface:   #f1ebdc;
  --surface-2: #ece4cf;
  --ink:       #2d2820;
  --ink-soft:  #5e5544;
  --rule:      #c8bea6;
  --teal:      #3b6b62;
  --gold:      #8e6b2a;
}