/* ============ Design tokens ============ */
:root {
  color-scheme: dark;
  --bg: #0a0e13;
  --bg-elev: #0f151c;
  --surface: #121a23;
  --surface-2: #16202b;
  --surface-3: #1b2834;
  --border: #24313f;
  --border-strong: #31414f;
  --fg: #e7edf4;
  --fg-soft: #c2ceda;
  --muted: #8b98a9;
  --muted-2: #6b7887;
  --accent: #2dd4bf;
  --accent-strong: #5eead4;
  --accent-dim: rgba(45, 212, 191, 0.12);
  --up: #2fbf71;
  --up-dim: rgba(47, 191, 113, 0.14);
  --down: #e5534b;
  --down-dim: rgba(229, 83, 75, 0.14);
  --warning: #e3b341;
  --warning-dim: rgba(227, 179, 65, 0.12);
  --info: #58a6ff;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 18px 45px -22px rgba(0, 0, 0, 0.75);
  --font: "Noto Sans Arabic", "IBM Plex Sans Arabic", "Segoe UI", Tahoma, "DejaVu Sans", sans-serif;
  --mono: "JetBrains Mono", "SFMono-Regular", Consolas, "DejaVu Sans Mono", monospace;
  --sidebar-w: 276px;
}

/* ============ Reset ============ */
*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: auto; }
body {
  margin: 0;
  font-family: var(--font);
  background:
    radial-gradient(900px 500px at 85% -10%, rgba(45, 212, 191, 0.07), transparent 60%),
    radial-gradient(700px 400px at 10% 0%, rgba(88, 166, 255, 0.05), transparent 55%),
    var(--bg);
  color: var(--fg);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4, p, ul, ol, figure { margin: 0; }
h1, h2, h3 { line-height: 1.35; font-weight: 700; letter-spacing: -0.01em; }
h1[tabindex="-1"]:focus, .quiz-result:focus { outline: none; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-strong); }
button, input, select { font: inherit; color: inherit; }
button { cursor: pointer; }
canvas { display: block; }
img, svg { max-width: 100%; }

::selection { background: rgba(45, 212, 191, 0.28); color: #fff; }
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  inset-block-start: -100px;
  inset-inline-start: 16px;
  padding: 10px 16px;
  background: var(--accent);
  color: #04201c;
  font-weight: 700;
  border-radius: 8px;
  z-index: 100;
  transition: inset-block-start 0.15s ease;
}
.skip-link:focus { inset-block-start: 12px; color: #04201c; }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ============ Layout ============ */
.layout { display: flex; min-height: 100vh; }

.sidebar {
  width: var(--sidebar-w);
  flex: 0 0 var(--sidebar-w);
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  gap: 22px;
  padding: 24px 20px;
  background: linear-gradient(180deg, #0d131a 0%, #0b1016 100%);
  border-inline-start: 1px solid var(--border);
  overflow-y: auto;
  z-index: 40;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--fg);
}
.brand:hover { color: var(--fg); }
.brand-mark { width: 42px; height: 42px; flex: 0 0 42px; border-radius: 10px; box-shadow: 0 0 0 1px var(--border); }
.brand-text { display: flex; flex-direction: column; font-size: 1.22rem; font-weight: 800; letter-spacing: -0.02em; }
.brand-text small { font-size: 0.71rem; font-weight: 500; color: var(--muted); letter-spacing: 0; margin-top: 1px; }

.nav { display: flex; flex-direction: column; gap: 4px; }
.nav a {
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  color: var(--fg-soft);
  font-size: 0.94rem;
  font-weight: 500;
  border: 1px solid transparent;
  transition: background 0.15s ease, color 0.15s ease;
}
.nav a svg { width: 19px; height: 19px; flex: 0 0 19px; color: var(--muted); transition: color 0.15s ease; }
.nav a:hover { background: var(--surface); color: var(--fg); }
.nav a:hover svg { color: var(--accent); }
.nav a.active {
  background: var(--accent-dim);
  border-color: rgba(45, 212, 191, 0.22);
  color: var(--accent-strong);
  font-weight: 600;
}
.nav a.active svg { color: var(--accent); }

.side-progress {
  margin-top: auto;
  padding: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
.side-progress .sp-head { display: flex; justify-content: space-between; align-items: baseline; font-size: 0.8rem; color: var(--muted); margin-bottom: 9px; }
.side-progress .sp-pct { font-family: var(--mono); font-size: 1rem; color: var(--accent-strong); font-weight: 700; }
.progress-track { height: 7px; background: #0a1017; border-radius: 99px; overflow: hidden; border: 1px solid var(--border); }
.progress-fill { height: 100%; background: linear-gradient(90deg, var(--accent), #58a6ff); border-radius: 99px; transition: width 0.4s ease; }
.side-progress .sp-sub { margin-top: 9px; font-size: 0.74rem; color: var(--muted-2); }
.sp-reset {
  margin-top: 10px; background: none; border: 0; padding: 0;
  color: var(--muted-2); font-size: 0.74rem; text-decoration: underline;
  text-underline-offset: 3px;
}
.sp-reset:hover { color: var(--down); }

.side-note {
  font-size: 0.72rem;
  color: var(--muted-2);
  line-height: 1.7;
  padding: 12px;
  border-inline-start: 2px solid var(--border-strong);
}

.content { flex: 1 1 auto; min-width: 0; display: flex; flex-direction: column; }
main#main { flex: 1 0 auto; width: 100%; max-width: 1080px; margin: 0 auto; padding: 34px 38px 70px; outline: none; }

.topbar { display: none; }

.footer {
  max-width: 1080px;
  width: 100%;
  margin: 0 auto;
  padding: 22px 38px 40px;
  color: var(--muted-2);
  font-size: 0.78rem;
  line-height: 1.8;
  border-top: 1px solid var(--border);
}
.footer p + p { margin-top: 8px; }
.footer strong { color: var(--muted); }
.footer-small { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.04em; color: var(--muted-2); }

.scrim { position: fixed; inset: 0; background: rgba(3, 7, 10, 0.66); z-index: 35; backdrop-filter: blur(2px); }

/* ============ Typography helpers ============ */
.eyebrow {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 0.72rem; font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 12px;
}
.eyebrow::before { content: ""; width: 18px; height: 1px; background: var(--accent); opacity: 0.7; }
.lead { font-size: 1.04rem; color: var(--fg-soft); }
.muted { color: var(--muted); }
.num { font-family: var(--mono); font-variant-numeric: tabular-nums; direction: ltr; display: inline-block; }

/* ============ Buttons ============ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 18px;
  border-radius: 10px;
  border: 1px solid var(--border-strong);
  background: var(--surface-2);
  color: var(--fg);
  font-size: 0.92rem;
  font-weight: 600;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
  text-align: center;
}
.btn:hover { background: var(--surface-3); border-color: #3d4f60; color: var(--fg); }
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: linear-gradient(180deg, #35e0ca, #20b9a6);
  border-color: #2dd4bf;
  color: #04201c;
  box-shadow: 0 10px 28px -14px rgba(45, 212, 191, 0.75);
}
.btn-primary:hover { background: linear-gradient(180deg, #5eead4, #2dd4bf); color: #04201c; border-color: #5eead4; }
.btn-ghost { background: transparent; border-color: var(--border); color: var(--fg-soft); }
.btn-ghost:hover { background: var(--surface); }
.btn-sm { padding: 7px 13px; font-size: 0.82rem; }
.btn[disabled] { opacity: 0.45; cursor: not-allowed; }
.btn-row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }

/* ============ Hero ============ */
.hero {
  position: relative;
  padding: 30px 0 10px;
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(240px, 0.65fr);
  gap: 34px;
  align-items: end;
  margin-bottom: 40px;
}
.hero h1 { font-size: clamp(2rem, 4.2vw, 3.1rem); letter-spacing: -0.03em; margin-bottom: 16px; }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero .lead { max-width: 54ch; }
.hero-actions { margin-top: 24px; }
.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 30px;
  max-width: 430px;
}
.hero-stat { padding: 12px 14px; background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius-sm); }
.hero-stat strong { display: block; font-family: var(--mono); font-size: 1.25rem; color: var(--fg); }
.hero-stat span { font-size: 0.72rem; color: var(--muted); }

.hero-panel {
  background: linear-gradient(160deg, var(--surface-2), var(--bg-elev));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}
.hero-panel h2 { font-size: 0.95rem; margin-bottom: 4px; }
.hero-panel p { font-size: 0.8rem; color: var(--muted); margin-bottom: 14px; }
.roadmap { display: flex; flex-direction: column; gap: 0; }
.roadmap li { display: flex; gap: 12px; list-style: none; }
.roadmap ol { margin: 0; padding: 0; display: flex; flex-direction: column; gap: 0; }
.rm-step { position: relative; padding: 0 0 16px 0; display: flex; gap: 11px; }
.rm-step:last-child { padding-bottom: 0; }
.rm-dot {
  position: relative; z-index: 1;
  width: 12px; height: 12px; flex: 0 0 12px; border-radius: 50%;
  margin-top: 7px; background: var(--surface-3); border: 2px solid var(--muted-2);
}
.rm-step.done .rm-dot { background: var(--accent); border-color: var(--accent); }
.rm-step:not(:last-child)::before {
  content: ""; position: absolute; inset-inline-start: 5px; top: 19px; bottom: 0;
  width: 1px; background: var(--border);
}
.rm-body { font-size: 0.85rem; color: var(--muted); }
.rm-body strong { display: block; color: var(--fg-soft); font-size: 0.86rem; font-weight: 600; }
.rm-step.done .rm-body strong { color: var(--accent-strong); }

/* ============ Section heads ============ */
.section-head { display: flex; justify-content: space-between; align-items: baseline; gap: 18px; margin: 0 0 18px; }
.section-head h2 { font-size: 1.3rem; }
.section-head .link-more { font-size: 0.82rem; color: var(--muted); }
.section-head .link-more:hover { color: var(--accent); }

/* ============ Cards / grids ============ */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.feature {
  padding: 18px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
.feature .f-icon {
  width: 34px; height: 34px; display: grid; place-items: center;
  border-radius: 8px; background: var(--accent-dim); color: var(--accent);
  margin-bottom: 12px;
}
.feature .f-icon svg { width: 19px; height: 19px; }
.feature h3 { font-size: 0.95rem; margin-bottom: 5px; }
.feature p { font-size: 0.83rem; color: var(--muted); line-height: 1.7; }

.lessons-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.lesson-card {
  display: flex; flex-direction: column; gap: 8px;
  padding: 20px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--fg);
  transition: border-color 0.15s ease, background 0.15s ease, transform 0.12s ease;
  position: relative;
  overflow: hidden;
}
.lesson-card:hover { border-color: rgba(45, 212, 191, 0.4); background: var(--surface); color: var(--fg); transform: translateY(-2px); }
.lesson-card-top { display: flex; justify-content: space-between; align-items: center; gap: 10px; }
.lesson-num { font-family: var(--mono); font-size: 0.72rem; color: var(--muted-2); letter-spacing: 0.08em; }
.badge {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: 0.68rem; font-weight: 600;
  padding: 3px 9px; border-radius: 99px;
  background: var(--surface-3); color: var(--muted);
  border: 1px solid var(--border);
}
.badge-done { background: var(--up-dim); color: var(--up); border-color: rgba(47, 191, 113, 0.35); }
.badge-score { background: var(--accent-dim); color: var(--accent-strong); border-color: rgba(45, 212, 191, 0.3); }
.lesson-card h3 { font-size: 1.02rem; }
.lesson-card p { font-size: 0.83rem; color: var(--muted); line-height: 1.65; }
.lesson-card-foot { margin-top: auto; padding-top: 8px; display: flex; gap: 14px; font-size: 0.74rem; color: var(--muted-2); }

/* ============ Callouts ============ */
.callout {
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  border-inline-start: 3px solid var(--info);
  background: rgba(88, 166, 255, 0.06);
  font-size: 0.88rem;
  color: var(--fg-soft);
  line-height: 1.75;
}
.callout strong { color: var(--fg); }
.callout-warn { border-inline-start-color: var(--warning); background: var(--warning-dim); }
.callout-gain { border-inline-start-color: var(--up); background: var(--up-dim); }
.callout-loss { border-inline-start-color: var(--down); background: var(--down-dim); }
.callout p + p { margin-top: 8px; }

/* ============ Lesson page ============ */
.crumbs { font-size: 0.78rem; color: var(--muted-2); margin-bottom: 14px; display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.crumbs a { color: var(--muted); }
.crumbs a:hover { color: var(--accent); }
.crumbs span { color: var(--border-strong); }

.lesson-head { margin-bottom: 26px; }
.lesson-head h1 { font-size: clamp(1.7rem, 3.4vw, 2.5rem); margin-bottom: 10px; }
.lesson-meta { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: 14px; font-size: 0.78rem; color: var(--muted); }
.lesson-meta span { display: inline-flex; align-items: center; gap: 6px; }
.dot { width: 5px; height: 5px; border-radius: 50%; background: var(--border-strong); display: inline-block; }

.objectives {
  margin: 24px 0 30px;
  max-width: 74ch;
  padding: 18px 20px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
.objectives h2 { font-size: 0.78rem; letter-spacing: 0.05em; color: var(--accent); margin-bottom: 10px; }
.objectives ul { margin: 0; padding-inline-start: 18px; display: grid; gap: 5px; }
.objectives li { font-size: 0.88rem; color: var(--fg-soft); }
.objectives li::marker { color: var(--accent); }

.prose { display: flex; flex-direction: column; gap: 26px; }
.prose > section { max-width: 74ch; }
.prose section > h2 { font-size: 1.16rem; margin-bottom: 10px; }
.prose section > h3 { font-size: 0.98rem; margin: 18px 0 7px; color: var(--fg-soft); }
.prose p { font-size: 0.94rem; color: var(--fg-soft); line-height: 1.9; }
.prose p + p { margin-top: 10px; }
.prose ul, .prose ol { margin: 10px 0 0; padding-inline-start: 22px; display: grid; gap: 7px; }
.prose li { font-size: 0.92rem; color: var(--fg-soft); line-height: 1.85; }
.prose li::marker { color: var(--accent); }
.prose strong { color: var(--fg); }
.prose .en { font-family: var(--mono); font-size: 0.82em; color: var(--accent); direction: ltr; display: inline-block; }
.prose .callout { margin-top: 14px; }

/* Candle anatomy figure */
.figure-candle {
  margin: 18px 0 0;
  padding: 18px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: grid;
  grid-template-columns: 170px 1fr;
  gap: 20px;
  align-items: center;
}
.figure-candle svg { width: 100%; height: auto; }
.candle-legend { display: grid; gap: 8px; }
.candle-legend div { display: flex; align-items: baseline; gap: 8px; font-size: 0.83rem; color: var(--muted); }
.candle-legend b { color: var(--fg-soft); font-weight: 600; min-width: 46px; }
.candle-legend .swatch { width: 9px; height: 9px; border-radius: 2px; flex: 0 0 9px; }

/* ============ Chart ============ */
.chart-card {
  margin: 22px 0 0;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.chart-head {
  display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 10px;
  padding: 13px 16px;
  border-bottom: 1px solid var(--border);
  background: rgba(18, 26, 35, 0.7);
}
.chart-title { display: flex; align-items: center; gap: 9px; font-size: 0.86rem; font-weight: 600; }
.chart-title .sym { font-family: var(--mono); color: var(--fg); letter-spacing: 0.02em; }
.chart-title .tf { font-size: 0.7rem; color: var(--muted); border: 1px solid var(--border); border-radius: 4px; padding: 1px 6px; }
.chart-legend { display: flex; flex-wrap: wrap; gap: 10px; font-size: 0.7rem; color: var(--muted); }
.chart-legend span { display: inline-flex; align-items: center; gap: 5px; font-family: var(--mono); direction: ltr; }
.chart-legend i { width: 14px; height: 2px; border-radius: 2px; display: inline-block; }
.chart-wrap { position: relative; width: 100%; height: 400px; }
.chart-wrap canvas { width: 100%; height: 100%; }
.chart-tooltip {
  position: absolute;
  z-index: 6;
  min-width: 168px;
  padding: 10px 12px;
  background: rgba(10, 16, 22, 0.96);
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  font-size: 0.74rem;
  color: var(--fg-soft);
  pointer-events: none;
  backdrop-filter: blur(4px);
}
.chart-tooltip .tt-date { color: var(--muted); font-size: 0.68rem; margin-bottom: 5px; font-family: var(--mono); direction: ltr; text-align: right; }
.chart-tooltip dl { display: grid; grid-template-columns: auto auto; gap: 2px 12px; margin: 0; }
.chart-tooltip dt { color: var(--muted); }
.chart-tooltip dd { margin: 0; font-family: var(--mono); direction: ltr; text-align: left; color: var(--fg); }
.chart-tooltip .up { color: var(--up); }
.chart-tooltip .down { color: var(--down); }
.chart-foot { padding: 10px 16px; border-top: 1px solid var(--border); font-size: 0.72rem; color: var(--muted-2); display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.chart-caption { padding: 13px 16px; font-size: 0.82rem; color: var(--muted); background: rgba(18, 26, 35, 0.55); border-top: 1px solid var(--border); line-height: 1.7; }
.chart-caption strong { color: var(--fg-soft); }

/* ============ Terms chips ============ */
.terms-block { margin-top: 30px; padding-top: 20px; border-top: 1px solid var(--border); }
.terms-block h2 { font-size: 0.78rem; color: var(--muted); margin-bottom: 10px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 11px;
  font-size: 0.78rem;
  color: var(--fg-soft);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 99px;
  transition: border-color 0.15s ease, color 0.15s ease;
}
.chip:hover { border-color: rgba(45, 212, 191, 0.4); color: var(--accent); }
.chip .en { font-family: var(--mono); font-size: 0.66rem; color: var(--muted-2); direction: ltr; }

/* ============ Quiz ============ */
.quiz {
  margin-top: 36px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.quiz-head { padding: 18px 20px; border-bottom: 1px solid var(--border); display: flex; justify-content: space-between; gap: 14px; align-items: baseline; flex-wrap: wrap; }
.quiz-head h2 { font-size: 1.05rem; }
.quiz-head .q-count { font-size: 0.76rem; color: var(--muted); }
.quiz-body { padding: 8px 20px 20px; display: flex; flex-direction: column; gap: 4px; }
.question { padding: 18px 0; border-bottom: 1px solid var(--border); }
.question:last-of-type { border-bottom: 0; }
.question h3 { font-size: 0.95rem; margin-bottom: 13px; line-height: 1.7; }
.question h3 .q-num { color: var(--accent); font-family: var(--mono); font-size: 0.78rem; margin-inline-end: 7px; }
.options { display: grid; gap: 8px; }
.option {
  display: flex; align-items: flex-start; gap: 10px;
  width: 100%;
  text-align: start;
  padding: 11px 13px;
  border-radius: 9px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--fg-soft);
  font-size: 0.88rem;
  line-height: 1.6;
  transition: border-color 0.13s ease, background 0.13s ease;
}
.option:hover { border-color: var(--border-strong); background: var(--surface-2); }
.option .marker {
  width: 20px; height: 20px; flex: 0 0 20px;
  border-radius: 50%;
  border: 1.5px solid var(--border-strong);
  display: grid; place-items: center;
  font-family: var(--mono); font-size: 0.68rem; color: var(--muted);
  margin-top: 1px;
}
.option[aria-pressed="true"] { border-color: var(--accent); background: var(--accent-dim); color: var(--fg); }
.option[aria-pressed="true"] .marker { border-color: var(--accent); background: var(--accent); color: #04201c; }
.option.correct { border-color: var(--up); background: var(--up-dim); color: var(--fg); }
.option.correct .marker { border-color: var(--up); background: var(--up); color: #03150b; }
.option.wrong { border-color: var(--down); background: var(--down-dim); color: var(--fg); }
.option.wrong .marker { border-color: var(--down); background: var(--down); color: #1c0503; }
.option[disabled] { cursor: default; }
.why {
  margin-top: 11px;
  padding: 11px 13px;
  border-radius: 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.7;
}
.why strong { color: var(--fg-soft); }
.why .ok { color: var(--up); font-weight: 600; }
.why .no { color: var(--down); font-weight: 600; }
.quiz-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; padding-top: 18px; }
.quiz-result { font-size: 0.87rem; color: var(--muted); }
.quiz-result.pass { color: var(--up); }
.quiz-result.fail { color: var(--warning); }

/* ============ Lesson nav ============ */
.lesson-nav {
  display: flex; justify-content: space-between; gap: 12px;
  margin-top: 34px;
  padding-top: 22px;
  border-top: 1px solid var(--border);
}
.lesson-nav a { display: flex; flex-direction: column; gap: 3px; padding: 12px 16px; border: 1px solid var(--border); border-radius: 10px; min-width: 0; max-width: 46%; transition: border-color 0.15s ease; }
.lesson-nav a:hover { border-color: var(--border-strong); }
.lesson-nav .dir { font-size: 0.7rem; color: var(--muted-2); }
.lesson-nav .name { font-size: 0.86rem; color: var(--fg-soft); font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.lesson-nav a.next { margin-inline-start: auto; text-align: end; align-items: flex-end; }
.lesson-nav a.disabled { visibility: hidden; }

/* ============ Lab ============ */
.page-head { margin-bottom: 26px; }
.page-head h1 { font-size: clamp(1.7rem, 3.4vw, 2.4rem); margin-bottom: 8px; }
.page-head p { color: var(--muted); font-size: 0.95rem; max-width: 70ch; }

.lab-controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  padding: 16px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius) var(--radius) 0 0;
  border-bottom: 0;
}
.field { display: flex; flex-direction: column; gap: 6px; }
.field label { font-size: 0.74rem; color: var(--muted); font-weight: 600; }
.field select, .field input {
  width: 100%;
  padding: 9px 11px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.87rem;
  color: var(--fg);
  appearance: none;
}
.field select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%238b98a9' stroke-width='1.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: left 11px center;
  padding-inline-start: 11px;
  padding-inline-end: 30px;
}
.field select:focus, .field input:focus { border-color: var(--accent); outline: none; box-shadow: 0 0 0 3px rgba(45, 212, 191, 0.15); }

.toggle-row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; padding: 12px 16px; background: var(--bg-elev); border: 1px solid var(--border); border-bottom: 0; }
.toggle {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 6px 12px;
  border-radius: 99px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--muted);
  font-size: 0.79rem;
  user-select: none;
}
.toggle input { width: 14px; height: 14px; accent-color: var(--accent); margin: 0; }
.toggle:has(input:checked) { border-color: rgba(45, 212, 191, 0.4); color: var(--accent-strong); background: var(--accent-dim); }

.lab-chart { border-radius: 0 0 var(--radius) var(--radius); border-top: 0; margin-top: 0; }
.lab-chart .chart-wrap { height: 460px; }

.reading-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 22px; }
.reading {
  padding: 14px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
.reading .r-label { font-size: 0.72rem; color: var(--muted); margin-bottom: 6px; display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.reading .r-value { font-family: var(--mono); font-size: 1.02rem; color: var(--fg); direction: ltr; text-align: right; }
.reading .r-note { font-size: 0.73rem; margin-top: 5px; color: var(--muted-2); line-height: 1.55; }
.reading .r-note.bull { color: var(--up); }
.reading .r-note.bear { color: var(--down); }
.reading .r-note.neutral { color: var(--warning); }

.lab-tasks { margin-top: 26px; padding: 18px 20px; background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius-sm); }
.lab-tasks h2 { font-size: 0.95rem; margin-bottom: 10px; }
.lab-tasks ol { margin: 0; padding-inline-start: 20px; display: grid; gap: 7px; font-size: 0.86rem; color: var(--muted); }
.lab-tasks li::marker { color: var(--accent); font-family: var(--mono); }
.lab-tasks strong { color: var(--fg-soft); }

/* ============ Calculator ============ */
.calc-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 18px; align-items: start; }
.calc-card { background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; }
.calc-card h2 { font-size: 1rem; margin-bottom: 4px; }
.calc-card .hint { font-size: 0.78rem; color: var(--muted); margin-bottom: 16px; }
.calc-form { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.calc-form .field:last-child:nth-child(odd) { grid-column: 1 / -1; }
.calc-results { display: flex; flex-direction: column; gap: 0; }
.res-row { display: flex; justify-content: space-between; gap: 14px; padding: 11px 0; border-bottom: 1px dashed var(--border); font-size: 0.87rem; }
.res-row:last-child { border-bottom: 0; }
.res-row dt { color: var(--muted); }
.res-row dd { margin: 0; font-family: var(--mono); color: var(--fg); direction: ltr; text-align: left; }
.res-row.emphasis dd { color: var(--accent-strong); font-size: 1.02rem; font-weight: 700; }
.res-row.danger dd { color: var(--down); }
.calc-empty { padding: 26px 0; text-align: center; color: var(--muted-2); font-size: 0.85rem; }
.calc-note { margin-top: 16px; }

/* ============ Glossary ============ */
.glossary-tools { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; margin-bottom: 18px; }
.search-box { position: relative; flex: 1 1 280px; }
.search-box svg { position: absolute; inset-inline-start: 12px; top: 50%; transform: translateY(-50%); width: 17px; height: 17px; color: var(--muted-2); pointer-events: none; }
.search-box input {
  width: 100%;
  padding: 11px 14px;
  padding-inline-start: 38px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 0.9rem;
}
.search-box input:focus { border-color: var(--accent); outline: none; box-shadow: 0 0 0 3px rgba(45, 212, 191, 0.14); }
.glossary-count { font-size: 0.78rem; color: var(--muted); white-space: nowrap; }
.glossary-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.term-card {
  padding: 16px 18px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
.term-card h2 { font-size: 0.95rem; display: flex; align-items: baseline; justify-content: space-between; gap: 10px; flex-wrap: wrap; margin-bottom: 6px; }
.term-card .en { font-family: var(--mono); font-size: 0.7rem; color: var(--accent); direction: ltr; font-weight: 500; }
.term-card p { font-size: 0.83rem; color: var(--muted); line-height: 1.75; }
.empty-state { padding: 40px 16px; text-align: center; color: var(--muted); border: 1px dashed var(--border); border-radius: var(--radius-sm); grid-column: 1 / -1; }

/* ============ Exam ============ */
.exam-intro { display: grid; grid-template-columns: minmax(0, 1fr) 240px; gap: 24px; align-items: start; margin-bottom: 30px; }
.exam-facts { padding: 18px; background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius-sm); }
.exam-facts ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.exam-facts li { display: flex; justify-content: space-between; gap: 10px; font-size: 0.82rem; color: var(--muted); border-bottom: 1px dashed var(--border); padding-bottom: 9px; }
.exam-facts li:last-child { border-bottom: 0; padding-bottom: 0; }
.exam-facts b { color: var(--fg-soft); font-family: var(--mono); }
.exam-result-card { padding: 24px; background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 24px; display: flex; gap: 22px; align-items: center; }
.score-ring {
  --pct: 0;
  width: 96px; height: 96px; flex: 0 0 96px;
  border-radius: 50%;
  background: conic-gradient(var(--accent) calc(var(--pct) * 1%), var(--surface-3) 0);
  display: grid; place-items: center;
  position: relative;
}
.score-ring::before { content: ""; position: absolute; inset: 7px; border-radius: 50%; background: var(--bg-elev); }
.score-ring span { position: relative; font-family: var(--mono); font-size: 1.35rem; font-weight: 700; color: var(--fg); }
.exam-result-card h2 { font-size: 1.15rem; margin-bottom: 5px; }
.exam-result-card p { font-size: 0.85rem; color: var(--muted); }

/* ============ Sharia page ============ */
.sharia-banner { margin-top: 26px; }
.sharia-banner a { text-decoration: underline; text-underline-offset: 3px; }

.sharia-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.sharia-card {
  padding: 18px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
.sharia-card h3 { font-size: 0.95rem; margin-bottom: 6px; color: var(--fg); }
.sharia-card p { font-size: 0.84rem; color: var(--muted); line-height: 1.8; }

.prohibited-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.prohibited-item {
  padding: 16px 18px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-inline-start: 3px solid var(--down);
  border-radius: var(--radius-sm);
}
.prohibited-item h3 { font-size: 0.93rem; margin-bottom: 5px; color: var(--fg); }
.prohibited-item p { font-size: 0.83rem; color: var(--muted); line-height: 1.75; }

.checklist {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 9px;
}
.checklist li {
  position: relative;
  padding: 10px 34px 10px 14px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 9px;
  font-size: 0.86rem;
  color: var(--fg-soft);
  line-height: 1.65;
}
.checklist li::before {
  content: "✓";
  position: absolute;
  inset-inline-start: 13px;
  top: 10px;
  color: var(--accent);
  font-weight: 700;
}

.positions { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.position-card {
  padding: 18px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
.position-card h3 { font-size: 0.95rem; margin-bottom: 6px; color: var(--accent-strong); }
.position-card p { font-size: 0.84rem; color: var(--muted); line-height: 1.8; }

.zakat-card {
  margin-top: 34px;
  padding: 20px;
  background: linear-gradient(160deg, var(--accent-dim), var(--bg-elev));
  border: 1px solid rgba(45, 212, 191, 0.28);
  border-radius: var(--radius);
}
.zakat-card h2 { font-size: 1.05rem; margin-bottom: 8px; color: var(--accent-strong); }
.zakat-card p { font-size: 0.88rem; color: var(--fg-soft); line-height: 1.85; }

.source-list { margin: 0; padding-inline-start: 20px; display: grid; gap: 10px; }
.source-list li { font-size: 0.84rem; color: var(--fg-soft); line-height: 1.7; }
.source-list li::marker { color: var(--accent); font-family: var(--mono); }
.source-list a { text-decoration: underline; text-underline-offset: 3px; }
.source-list span { display: block; color: var(--muted); font-size: 0.78rem; margin-top: 2px; }

/* ============ Responsive ============ */
@media (max-width: 1060px) {
  .hero { grid-template-columns: 1fr; gap: 24px; }
  .hero-panel { max-width: 460px; }
  .reading-grid { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 860px) {
  .sidebar {
    position: fixed;
    inset-block: 0;
    left: auto;
    right: 0;
    transform: translateX(100%);
    visibility: hidden;
    transition: transform 0.22s ease, visibility 0.22s;
    box-shadow: -20px 0 60px rgba(0, 0, 0, 0.5);
    border-right: 0;
    border-left: 1px solid var(--border);
    width: 288px;
  }
  .sidebar.open { transform: translateX(0); visibility: visible; }
  .topbar {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 18px;
    position: sticky;
    top: 0;
    z-index: 30;
    background: rgba(10, 14, 19, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
  }
  .icon-btn {
    width: 38px; height: 38px;
    display: grid; place-items: center;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 9px;
    color: var(--fg-soft);
  }
  .icon-btn svg { width: 20px; height: 20px; }
  .topbar-title { font-weight: 700; font-size: 1rem; }
  .topbar-cta { margin-inline-start: auto; font-size: 0.8rem; border: 1px solid var(--border); padding: 6px 12px; border-radius: 8px; color: var(--fg-soft); }
  main#main { padding: 24px 20px 60px; }
  .footer { padding: 20px 20px 32px; }
  .lesson-nav a { max-width: 48%; }
}

@media (max-width: 720px) {
  .lessons-grid, .glossary-list, .calc-grid, .exam-intro, .sharia-grid, .prohibited-list, .positions, .checklist { grid-template-columns: 1fr; }
  .grid-3 { grid-template-columns: 1fr; }
  .hero-stats { grid-template-columns: repeat(3, 1fr); }
  .figure-candle { grid-template-columns: 1fr; }
  .figure-candle svg { max-width: 170px; margin: 0 auto; }
  .chart-wrap { height: 330px; }
  .lab-chart .chart-wrap { height: 380px; }
  .reading-grid { grid-template-columns: 1fr 1fr; }
  .calc-form { grid-template-columns: 1fr; }
  .lesson-meta { gap: 6px 14px; }
  .exam-result-card { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 1.9rem; }
  .hero-stats { gap: 7px; }
  .hero-stat { padding: 10px; }
  .hero-stat strong { font-size: 1.02rem; }
  .hero-stat span { font-size: 0.66rem; }
  .reading-grid { grid-template-columns: 1fr; }
  .chart-legend { display: none; }
  .chart-card .chart-wrap { height: 300px; }
  .quiz-body { padding-inline: 14px; }
  .lesson-nav { flex-direction: column; }
  .lesson-nav a { max-width: 100%; }
  .lesson-nav a.next { margin-inline-start: 0; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}