/* مقالات بطلميوس — Shared Design System */

@import url('https://fonts.googleapis.com/css2?family=Reem+Kufi:wght@400;500;600;700&family=Tajawal:wght@300;400;500;700&family=Cormorant+Garamond:wght@300;400;500;600;700&family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  /* Cosmic palette */
  --bg-deep: #07091a;
  --bg-base: #0a0e22;
  --bg-surface: #0f1530;
  --bg-elevated: #161c3d;
  --border-subtle: #1f2750;
  --border: #2a3470;

  /* Inks */
  --ink-bright: #f4efe0;
  --ink: #e8e1cd;
  --ink-muted: #9a93a8;
  --ink-dim: #5a566b;

  /* Accents */
  --gold: #d4a574;
  --gold-bright: #e8c089;
  --gold-deep: #8a6a3e;
  --gold-glow: rgba(212, 165, 116, 0.25);

  --cyan: #6fb8d4;
  --cyan-bright: #8fd0e8;
  --cyan-deep: #3a7a90;
  --cyan-glow: rgba(111, 184, 212, 0.25);

  --crimson: #c97b6e;
  --emerald: #7fb98a;

  /* Type */
  --font-ar-display: 'Reem Kufi', system-ui, sans-serif;
  --font-ar-body: 'Tajawal', system-ui, sans-serif;
  --font-en-display: 'Cormorant Garamond', Georgia, serif;
  --font-en-body: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg-deep);
  color: var(--ink);
  font-family: var(--font-en-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body {
  min-height: 100vh;
  overflow-x: hidden;
}

/* Star field background */
.starfield {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse at top, rgba(40, 50, 100, 0.4) 0%, transparent 60%),
    radial-gradient(ellipse at bottom right, rgba(80, 40, 30, 0.2) 0%, transparent 50%),
    var(--bg-deep);
}
.starfield::before, .starfield::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(1px 1px at 23% 14%, #fff, transparent),
    radial-gradient(1px 1px at 67% 28%, #fff, transparent),
    radial-gradient(1px 1px at 12% 71%, #d4e3ff, transparent),
    radial-gradient(2px 2px at 89% 54%, #fff, transparent),
    radial-gradient(1px 1px at 45% 91%, #fff, transparent),
    radial-gradient(1px 1px at 78% 82%, #ffe8d4, transparent),
    radial-gradient(1px 1px at 34% 47%, #fff, transparent),
    radial-gradient(1px 1px at 58% 6%, #fff, transparent),
    radial-gradient(1px 1px at 91% 12%, #fff, transparent),
    radial-gradient(1px 1px at 5% 33%, #fff, transparent),
    radial-gradient(1px 1px at 18% 88%, #fff, transparent),
    radial-gradient(1px 1px at 64% 66%, #d4e3ff, transparent),
    radial-gradient(1px 1px at 39% 22%, #fff, transparent),
    radial-gradient(2px 2px at 7% 58%, #ffe8d4, transparent),
    radial-gradient(1px 1px at 82% 38%, #fff, transparent);
  background-size: 100% 100%;
  opacity: 0.6;
}
.starfield::after {
  background-image:
    radial-gradient(1px 1px at 14% 24%, #fff, transparent),
    radial-gradient(1px 1px at 47% 78%, #fff, transparent),
    radial-gradient(1px 1px at 73% 11%, #fff, transparent),
    radial-gradient(1px 1px at 28% 56%, #fff, transparent),
    radial-gradient(2px 2px at 86% 72%, #fff, transparent),
    radial-gradient(1px 1px at 9% 41%, #d4e3ff, transparent),
    radial-gradient(1px 1px at 61% 39%, #fff, transparent),
    radial-gradient(1px 1px at 92% 89%, #fff, transparent);
  opacity: 0.4;
  animation: twinkle 7s ease-in-out infinite alternate;
}
@keyframes twinkle {
  from { opacity: 0.25; }
  to { opacity: 0.55; }
}

/* Type helpers */
.ar { font-family: var(--font-ar-display); direction: rtl; }
.ar-body { font-family: var(--font-ar-body); direction: rtl; }
.en { font-family: var(--font-en-display); }
.en-body { font-family: var(--font-en-body); }
.mono { font-family: var(--font-mono); }

/* Page chrome */
.topbar {
  position: relative;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 48px;
  border-bottom: 1px solid var(--border-subtle);
  background: linear-gradient(180deg, rgba(7,9,26,0.95), rgba(7,9,26,0.7));
  backdrop-filter: blur(8px);
}
.topbar .brand {
  display: flex;
  align-items: center;
  gap: 16px;
}
.topbar .brand-mark {
  width: 36px; height: 36px;
  border: 1px solid var(--gold-deep);
  border-radius: 50%;
  position: relative;
  background: radial-gradient(circle at 30% 30%, var(--gold-bright), var(--gold-deep));
  box-shadow: 0 0 24px var(--gold-glow);
}
.topbar .brand-mark::after {
  content: '';
  position: absolute;
  inset: -8px;
  border: 1px solid var(--gold-deep);
  border-radius: 50%;
  opacity: 0.4;
}
.topbar .brand-text-ar { font-family: var(--font-ar-display); font-size: 18px; color: var(--gold-bright); letter-spacing: 0.02em; }
.topbar .brand-text-en { font-family: var(--font-en-display); font-style: italic; font-size: 14px; color: var(--ink-muted); letter-spacing: 0.05em; }
.topbar .nav {
  display: flex;
  align-items: center;
  gap: 28px;
}
.topbar .nav a {
  color: var(--ink-muted);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: color 0.2s;
}
.topbar .nav a:hover { color: var(--gold-bright); }

/* Maqala header (for individual simulation pages) — compact */
.maqala-header {
  position: relative;
  z-index: 5;
  padding: 18px 64px 14px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: baseline;
  gap: 28px;
  flex-wrap: wrap;
}
.maqala-header .crumb {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--ink-dim);
  text-transform: uppercase;
  flex: 0 0 auto;
  align-self: center;
}
.maqala-header .crumb a { color: var(--gold-deep); text-decoration: none; }
.maqala-header .crumb a:hover { color: var(--gold-bright); }
.maqala-header h1 {
  margin: 0;
  font-family: var(--font-ar-display);
  font-size: 26px;
  font-weight: 500;
  color: var(--gold-bright);
  direction: rtl;
  letter-spacing: 0.01em;
  display: inline-flex;
  align-items: baseline;
  gap: 12px;
}
.maqala-header h1 .num { color: var(--gold-deep); font-weight: 400; font-size: 22px; }
.maqala-header h2 {
  margin: 0;
  font-family: var(--font-en-display);
  font-style: italic;
  font-weight: 400;
  font-size: 16px;
  color: var(--ink-muted);
  letter-spacing: 0.02em;
  flex: 1;
}
@media (max-width: 900px) {
  .maqala-header { padding: 16px 24px 12px; gap: 12px; }
  .maqala-header h1 { font-size: 22px; }
  .maqala-header h2 { font-size: 14px; }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  background: transparent;
  border: 1px solid var(--gold-deep);
  color: var(--gold-bright);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
  border-radius: 2px;
  transition: all 0.2s;
  text-decoration: none;
}
.btn:link, .btn:visited { text-decoration: none; }
.btn:hover { background: var(--gold-glow); border-color: var(--gold-bright); }
.btn.primary { background: var(--gold); color: var(--bg-deep); border-color: var(--gold); }
.btn.primary:hover { background: var(--gold-bright); border-color: var(--gold-bright); }
.btn.ghost { border-color: var(--border); color: var(--ink-muted); }
.btn.ghost:hover { color: var(--ink); border-color: var(--ink-muted); }
.btn.cyan { border-color: var(--cyan-deep); color: var(--cyan-bright); }
.btn.cyan:hover { background: var(--cyan-glow); border-color: var(--cyan-bright); }

/* Cards / panels */
.panel {
  background: linear-gradient(180deg, var(--bg-surface), var(--bg-base));
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  padding: 24px;
  position: relative;
}
.panel-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin-bottom: 16px;
}

/* Sliders */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  background: var(--bg-elevated);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 12px var(--gold-glow);
  cursor: grab;
  border: 2px solid var(--bg-deep);
}
input[type="range"]::-webkit-slider-thumb:active { cursor: grabbing; }
input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--gold);
  border: 2px solid var(--bg-deep);
  cursor: grab;
}
input[type="range"].cyan::-webkit-slider-thumb { background: var(--cyan); box-shadow: 0 0 12px var(--cyan-glow); }
input[type="range"].cyan::-moz-range-thumb { background: var(--cyan); }

/* Data readouts */
.readout {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink);
}
.readout .label {
  color: var(--ink-dim);
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 4px;
}
.readout .value { color: var(--gold-bright); font-size: 18px; }
.readout .value.cyan { color: var(--cyan-bright); }

/* Bilingual text helper */
.bi { display: flex; flex-direction: column; gap: 6px; }
.bi .ar { font-family: var(--font-ar-display); direction: rtl; color: var(--ink-bright); }
.bi .en { font-family: var(--font-en-display); font-style: italic; color: var(--ink-muted); }

/* Shared nav-foot for all maqalas */
.nav-foot {
  position: relative;
  z-index: 5;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 64px;
  border-top: 1px solid var(--border-subtle);
  background: rgba(7, 9, 26, 0.6);
  backdrop-filter: blur(6px);
}
@media (max-width: 900px) { .nav-foot { padding: 14px 20px; } }

/* Default body should be readable Tajawal */
body { font-family: var(--font-ar-body); font-size: 14px; }

/* Make body text within callouts and narratives consistently use the body font */
.callout > div > div:not(.mono) {
  font-family: var(--font-ar-body);
}

/* Compare bar (geocentric vs heliocentric) */
.compare-bar {
  display: inline-flex;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 100px;
  padding: 4px;
  gap: 2px;
}
.compare-bar button {
  padding: 6px 14px;
  background: transparent;
  border: none;
  color: var(--ink-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
  border-radius: 100px;
  transition: all 0.2s;
}
.compare-bar button.active.ptol { background: var(--gold-deep); color: var(--gold-bright); }
.compare-bar button.active.modern { background: var(--cyan-deep); color: var(--cyan-bright); }

/* Tooltip-ish callout */
.callout {
  display: flex;
  gap: 12px;
  padding: 14px 16px;
  background: rgba(212, 165, 116, 0.06);
  border-left: 2px solid var(--gold-deep);
  font-size: 13px;
  color: var(--ink);
  line-height: 1.6;
}
.callout.modern { background: rgba(111, 184, 212, 0.06); border-left-color: var(--cyan-deep); }

/* Section title */
.section-eyebrow {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--ink-dim);
}

/* No select */
.no-select { user-select: none; -webkit-user-select: none; }