/* MedAI Lexicon — Interactive Guide styles */
/* ═══════════════════════════════════════════ */

:root {
  --bg: #0e1014;
  --surface: #171a20;
  --surface-2: #1d2128;
  --ink: #f5f3ee;
  --ink-soft: #d2cfc8;
  --ink-muted: #8e8b84;
  --border: rgba(245,243,238,0.09);
  --border-strong: rgba(245,243,238,0.18);
  --accent-hue: 45;
  --accent: oklch(0.78 0.14 var(--accent-hue));
  --accent-soft: oklch(0.32 0.08 var(--accent-hue));
  --hue: 268;
  --density-pad: 20px;
  --headline-font: 'Playfair Display', serif;
  --body-font: 'DM Sans', system-ui, sans-serif;
  --mono-font: 'DM Mono', 'JetBrains Mono', monospace;
  --radius: 14px;
  --radius-lg: 24px;
  --shadow-card: 0 1px 2px rgba(0,0,0,0.3), 0 8px 32px rgba(0,0,0,0.2);
  --shadow-float: 0 20px 60px rgba(0,0,0,0.5);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--body-font);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
em { font-style: italic; }

/* Reusable buttons */
.btn-primary {
  display: inline-flex; align-items: center; gap: 12px;
  padding: 14px 22px;
  background: var(--accent);
  color: #0e1014;
  font-weight: 600; font-size: 15px;
  border-radius: 999px;
  transition: transform .15s, background .15s, box-shadow .2s;
  box-shadow: 0 4px 20px oklch(0.78 0.14 var(--accent-hue) / 0.25);
}
.btn-primary:hover:not(:disabled) { transform: translateY(-1px); box-shadow: 0 8px 28px oklch(0.78 0.14 var(--accent-hue) / 0.4); }
.btn-primary:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-primary .btn-sub { font-size: 12px; opacity: 0.6; font-weight: 500; margin-left: -4px; }

.btn-ghost {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 20px; font-weight: 500; font-size: 14px;
  color: var(--ink-soft);
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  transition: color .15s, border-color .15s, background .15s;
}
.btn-ghost:hover:not(:disabled) { color: var(--ink); border-color: var(--ink); background: var(--border); }
.btn-ghost:disabled { opacity: 0.3; cursor: not-allowed; }

/* ═══════════════ TOPBAR ═══════════════ */
.topbar {
  position: sticky; top: 0; z-index: 30;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.topbar-inner {
  max-width: 1240px; margin: 0 auto;
  display: flex; align-items: center; gap: 24px;
  padding: 14px 32px;
}
.brand {
  display: flex; align-items: center; gap: 12px;
  padding: 4px 6px; border-radius: 8px;
  transition: background .15s;
}
.brand:hover { background: var(--border); }
.brand-mark {
  width: 34px; height: 34px;
  background: var(--accent);
  color: #0e1014;
  border-radius: 8px;
  display: grid; place-items: center;
}
.brand-text { text-align: left; }
.brand-title { font-family: var(--headline-font); font-size: 18px; font-weight: 600; letter-spacing: -0.01em; }
.brand-sub { font-size: 11px; color: var(--ink-muted); font-family: var(--mono-font); letter-spacing: 0.08em; text-transform: uppercase; }

.topbar-progress {
  margin-left: auto;
  display: flex; align-items: center; gap: 12px;
  padding: 6px 14px 6px 6px;
  border: 1px solid var(--border);
  border-radius: 999px;
}
.tp-ring { position: relative; width: 36px; height: 36px; }
.tp-pct { position: absolute; inset: 0; display: grid; place-items: center; font-size: 10px; font-family: var(--mono-font); color: var(--ink-soft); font-weight: 600; }
.tp-n { font-size: 13px; font-weight: 600; font-family: var(--mono-font); }
.tp-n span { color: var(--ink-muted); font-weight: 400; }
.tp-lbl { font-size: 10px; color: var(--ink-muted); font-family: var(--mono-font); letter-spacing: 0.08em; text-transform: uppercase; }

.topnav { display: flex; gap: 16px; }
.topnav a {
  color: var(--ink-muted); text-decoration: none; font-size: 13px; font-weight: 500;
  padding: 8px 12px; border-radius: 6px; transition: color .15s, background .15s;
}
.topnav a:hover { color: var(--ink); background: var(--border); }

/* ═══════════════ HOME ═══════════════ */
.home { max-width: 1240px; margin: 0 auto; padding: 0 32px 120px; }

.hero {
  padding: 96px 0 80px;
  border-bottom: 1px solid var(--border);
}
.hero-label {
  display: inline-block; padding: 6px 14px;
  font-size: 11px; font-family: var(--mono-font); letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--accent);
  border: 1px solid oklch(0.6 0.12 var(--accent-hue) / 0.4);
  border-radius: 999px;
  margin-bottom: 32px;
}
.hero-h {
  font-family: var(--headline-font); font-weight: 500;
  font-size: clamp(44px, 6vw, 82px);
  line-height: 1.02; letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: 28px;
  text-wrap: balance;
}
.hero-h em { font-style: italic; color: var(--accent); }
.hero-taught { color: var(--ink-muted); }

.hero-sub {
  max-width: 640px; font-size: 19px; color: var(--ink-soft);
  line-height: 1.5; margin-bottom: 44px;
  text-wrap: pretty;
}
.hero-cta { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; margin-bottom: 64px; }

.hero-meta {
  display: inline-flex; align-items: center; gap: 36px;
  padding: 20px 36px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface);
}
.hm-item { text-align: left; }
.hm-n { font-family: var(--headline-font); font-size: 38px; font-weight: 500; line-height: 1; letter-spacing: -0.02em; }
.hm-l { font-size: 11px; color: var(--ink-muted); font-family: var(--mono-font); letter-spacing: 0.08em; text-transform: uppercase; margin-top: 6px; }
.hm-divider { width: 1px; height: 40px; background: var(--border); }

/* Modules grid */
.modules { padding: 80px 0; border-bottom: 1px solid var(--border); }
.section-lbl {
  font-size: 11px; font-family: var(--mono-font); letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--ink-muted); margin-bottom: 16px;
}
.section-h {
  font-family: var(--headline-font); font-weight: 500;
  font-size: clamp(28px, 3.5vw, 44px); line-height: 1.1;
  letter-spacing: -0.01em; margin-bottom: 48px;
  text-wrap: balance;
}
.modules-grid {
  display: grid; gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}
.mod-card {
  text-align: left;
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: transform .2s, border-color .2s, background .2s;
  position: relative; overflow: hidden;
}
.mod-card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: oklch(0.7 0.14 var(--hue));
  opacity: 0.5;
  transition: opacity .2s;
}
.mod-card:hover { transform: translateY(-4px); border-color: oklch(0.5 0.12 var(--hue) / 0.5); background: var(--surface-2); }
.mod-card:hover::before { opacity: 1; }
.mod-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.mod-num { font-family: var(--mono-font); font-size: 11px; color: var(--ink-muted); letter-spacing: 0.12em; }
.mod-tag {
  font-family: var(--mono-font); font-size: 10px;
  padding: 4px 10px; border-radius: 999px;
  background: oklch(0.3 0.06 var(--hue) / 0.4);
  color: oklch(0.82 0.12 var(--hue));
  letter-spacing: 0.08em; text-transform: uppercase;
}
.mod-title { font-family: var(--headline-font); font-size: 24px; font-weight: 500; letter-spacing: -0.01em; margin-bottom: 10px; }
.mod-blurb { font-size: 14px; color: var(--ink-muted); line-height: 1.5; margin-bottom: 20px; min-height: 42px; text-wrap: pretty; }
.mod-terms { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 24px; }
.mod-term {
  font-size: 11px; padding: 4px 9px; border-radius: 6px;
  background: var(--border); color: var(--ink-soft);
  font-family: var(--mono-font);
}
.mod-term.done { background: oklch(0.32 0.1 var(--hue) / 0.5); color: oklch(0.92 0.06 var(--hue)); }
.mod-term-more { font-size: 11px; color: var(--ink-muted); font-family: var(--mono-font); padding: 4px 6px; }
.mod-footer { display: flex; align-items: center; gap: 12px; }
.mod-bar { flex: 1; height: 3px; background: var(--border); border-radius: 2px; overflow: hidden; }
.mod-bar-fill { height: 100%; background: oklch(0.7 0.14 var(--hue)); border-radius: 2px; transition: width .4s; }
.mod-pct { font-family: var(--mono-font); font-size: 11px; color: var(--ink-muted); min-width: 40px; text-align: right; }

/* Browse all */
.browse { padding: 80px 0 0; }
.browse-grid {
  display: grid; gap: 8px;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
}
.brw {
  display: flex; align-items: center; gap: 10px;
  padding: 12px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  text-align: left;
  transition: border-color .15s, background .15s, transform .15s;
}
.brw:hover { border-color: oklch(0.5 0.12 var(--hue) / 0.5); background: var(--surface-2); transform: translateX(2px); }
.brw-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: oklch(0.7 0.14 var(--hue));
  flex-shrink: 0;
}
.brw-name { font-size: 13px; font-weight: 500; flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.brw-cl { font-size: 10px; font-family: var(--mono-font); color: var(--ink-muted); letter-spacing: 0.06em; text-transform: uppercase; }
.brw-check { font-size: 11px; color: oklch(0.75 0.14 var(--hue)); font-weight: 700; }
.brw.done .brw-dot { background: var(--ink); }

/* Footer */
.site-foot {
  margin-top: 80px; padding-top: 40px;
  border-top: 1px solid var(--border);
  font-size: 12px; color: var(--ink-muted);
  display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap;
}
.foot-disc { max-width: 500px; text-align: right; text-wrap: pretty; }

/* ═══════════════ LESSON ═══════════════ */
.lesson { max-width: 920px; margin: 0 auto; padding: 32px 32px 120px; }

.lesson-top {
  display: flex; align-items: center; gap: 20px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}
.lb-back {
  display: flex; align-items: center; gap: 6px;
  font-size: 13px; color: var(--ink-muted);
  padding: 8px 12px; border-radius: 8px;
  transition: color .15s, background .15s;
}
.lb-back:hover { color: var(--ink); background: var(--border); }

.lb-breadcrumbs { display: flex; align-items: center; gap: 10px; font-size: 12px; font-family: var(--mono-font); letter-spacing: 0.06em; text-transform: uppercase; }
.lb-module { font-weight: 600; }
.lb-sep { color: var(--ink-muted); }
.lb-count { color: var(--ink-muted); }

.lb-dots { margin-left: auto; display: flex; gap: 6px; align-items: center; }
.lb-dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--border);
  transition: background .15s, transform .15s;
  padding: 0;
}
.lb-dot.done { background: oklch(0.5 0.1 var(--hue)); }
.lb-dot.active { background: oklch(0.78 0.14 var(--hue)); transform: scale(1.4); }
.lb-dot:hover { background: var(--ink-soft); }

.lesson-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 56px 56px 48px;
  box-shadow: var(--shadow-card);
}

.lh-tag {
  display: inline-block; padding: 6px 14px;
  font-size: 11px; font-family: var(--mono-font);
  letter-spacing: 0.14em; text-transform: uppercase;
  border: 1px solid;
  border-radius: 999px;
  margin-bottom: 20px;
}
.lh-title {
  font-family: var(--headline-font); font-weight: 500;
  font-size: clamp(36px, 4.5vw, 56px); line-height: 1.05;
  letter-spacing: -0.02em; color: var(--ink);
  margin-bottom: 20px; text-wrap: balance;
}
.lh-def {
  font-size: 19px; color: var(--ink-soft); line-height: 1.5;
  margin-bottom: 40px;
  border-left: 2px solid oklch(0.5 0.12 var(--hue));
  padding-left: 20px;
  text-wrap: pretty;
}

/* Animation stage */
.anim-stage {
  background: linear-gradient(180deg, oklch(0.18 0.05 var(--hue) / 0.4), oklch(0.14 0.03 var(--hue) / 0.2));
  border: 1px solid oklch(0.4 0.08 var(--hue) / 0.35);
  border-radius: 16px;
  padding: 14px;
  margin-bottom: 44px;
  position: relative;
}
.anim-caption {
  display: flex; align-items: center; gap: 8px;
  margin-top: 12px; padding: 0 6px;
  font-size: 11px; font-family: var(--mono-font);
  color: var(--ink-muted); letter-spacing: 0.06em; text-transform: uppercase;
}
.anim-live-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: oklch(0.75 0.2 var(--hue));
  animation: pulse 1.8s ease-in-out infinite;
}
@keyframes pulse { 50% { opacity: 0.35; } }
.anim-missing {
  aspect-ratio: 560 / 320;
  display: grid; place-items: center;
  color: var(--ink-muted); font-family: var(--mono-font); font-size: 12px;
  border: 1px dashed var(--border);
  border-radius: 10px;
}

/* Persona */
.persona-wrap { margin-bottom: 40px; }
.persona-label {
  font-size: 11px; font-family: var(--mono-font);
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-muted); margin-bottom: 14px;
}
.persona-tabs { display: flex; gap: 6px; margin-bottom: 20px; flex-wrap: wrap; }
.pt {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 16px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 13px; color: var(--ink-muted);
  transition: all .15s;
}
.pt:hover { color: var(--ink-soft); border-color: var(--border-strong); }
.pt.active {
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
  font-weight: 600;
}
.pt-icon { font-size: 14px; }
.persona-body {
  padding: 24px 28px;
  background: var(--surface-2);
  border-radius: 12px;
  border-left: 3px solid oklch(0.7 0.14 var(--hue));
  animation: slideFade .4s ease-out;
}
@keyframes slideFade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } }
.persona-body p { font-size: 16px; color: var(--ink-soft); line-height: 1.65; text-wrap: pretty; }

/* Analogy */
.analogy {
  display: flex; gap: 18px;
  padding: 22px 26px;
  background: oklch(0.18 0.04 var(--hue) / 0.4);
  border: 1px solid oklch(0.4 0.08 var(--hue) / 0.3);
  border-radius: 12px;
  margin-bottom: 40px;
}
.analogy-mark {
  flex-shrink: 0;
  width: 36px; height: 36px;
  border-radius: 50%;
  background: oklch(0.78 0.14 var(--hue));
  color: oklch(0.18 0.04 var(--hue));
  display: grid; place-items: center;
}
.analogy-text { font-size: 15px; color: var(--ink-soft); line-height: 1.6; text-wrap: pretty; padding-top: 6px; }
.analogy-text strong { color: var(--ink); font-weight: 600; font-family: var(--headline-font); font-style: italic; letter-spacing: 0.01em; font-size: 16px; }

/* Lesson actions */
.lesson-actions { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; margin-top: 8px; }

/* Quiz */
.quiz { }
.quiz-label {
  font-size: 11px; font-family: var(--mono-font);
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 16px;
}
.quiz-q {
  font-family: var(--headline-font); font-weight: 500;
  font-size: 28px; line-height: 1.25;
  letter-spacing: -0.01em; margin-bottom: 28px;
  text-wrap: balance;
}
.quiz-choices { display: flex; flex-direction: column; gap: 10px; margin-bottom: 24px; }
.qc {
  display: flex; align-items: center; gap: 16px;
  padding: 18px 22px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 12px;
  text-align: left;
  transition: all .15s;
}
.qc:not(:disabled):hover { border-color: oklch(0.5 0.08 var(--hue) / 0.6); transform: translateX(3px); }
.qc.picked { border-color: oklch(0.7 0.14 var(--hue)); background: oklch(0.24 0.06 var(--hue) / 0.5); }
.qc-marker {
  flex-shrink: 0;
  width: 28px; height: 28px; border-radius: 6px;
  background: var(--border);
  display: grid; place-items: center;
  font-family: var(--mono-font); font-size: 13px; font-weight: 600;
  color: var(--ink-soft);
}
.qc.picked .qc-marker { background: oklch(0.7 0.14 var(--hue)); color: #0e1014; }
.qc-text { flex: 1; font-size: 15px; color: var(--ink-soft); }
.qc.correct { border-color: oklch(0.7 0.18 150); background: oklch(0.25 0.08 150 / 0.3); }
.qc.correct .qc-marker { background: oklch(0.7 0.18 150); color: #0e1014; }
.qc.correct .qc-text { color: var(--ink); }
.qc.wrong { border-color: oklch(0.65 0.2 20); background: oklch(0.25 0.08 20 / 0.3); }
.qc.wrong .qc-marker { background: oklch(0.65 0.2 20); color: #0e1014; }
.qc.dim { opacity: 0.4; }
.qc-ic { font-size: 16px; font-weight: 700; }

.quiz-why {
  padding: 20px 24px;
  border-radius: 12px;
  margin-bottom: 24px;
  animation: slideFade .3s;
}
.quiz-why.good { background: oklch(0.22 0.08 150 / 0.4); border-left: 3px solid oklch(0.7 0.18 150); }
.quiz-why.bad { background: oklch(0.22 0.08 20 / 0.4); border-left: 3px solid oklch(0.65 0.2 20); }
.qw-head { font-family: var(--headline-font); font-size: 20px; font-weight: 500; margin-bottom: 6px; letter-spacing: -0.01em; }
.qw-body { font-size: 14px; color: var(--ink-soft); line-height: 1.6; }

/* Recap */
.recap { }
.recap-label {
  font-size: 11px; font-family: var(--mono-font);
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 16px;
}
.recap-title {
  font-family: var(--headline-font); font-weight: 500;
  font-size: 40px; line-height: 1.05;
  letter-spacing: -0.02em; margin-bottom: 14px;
}
.recap-one { font-size: 17px; color: var(--ink-soft); line-height: 1.5; margin-bottom: 40px; text-wrap: pretty; }
.recap-related-lbl {
  font-size: 11px; font-family: var(--mono-font);
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-muted); margin-bottom: 12px;
}
.recap-related { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 40px; }
.rr {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 10px 16px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 13px; color: var(--ink-soft);
  transition: all .15s;
}
.rr:not(:disabled):hover { border-color: oklch(0.6 0.12 var(--hue) / 0.5); color: var(--ink); transform: translateX(3px); }
.rr:disabled { opacity: 0.4; cursor: default; }
.rr-arrow { color: var(--ink-muted); }
.recap-nav {
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  padding-top: 28px; border-top: 1px solid var(--border);
}

/* ═══════════════ TWEAKS ═══════════════ */
.tweaks {
  position: fixed; bottom: 24px; right: 24px; z-index: 50;
  width: 320px;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: 16px;
  box-shadow: var(--shadow-float);
  overflow: hidden;
  animation: slideFade .3s;
}
.tweaks-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-2);
}
.tweaks-title { font-family: var(--mono-font); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-muted); }
.tweaks-close {
  width: 24px; height: 24px; border-radius: 6px;
  color: var(--ink-muted); font-size: 20px; line-height: 1;
  display: grid; place-items: center;
  transition: color .15s, background .15s;
}
.tweaks-close:hover { color: var(--ink); background: var(--border); }
.tweaks-body { padding: 16px 18px 20px; display: flex; flex-direction: column; gap: 18px; }
.tw-row { display: flex; flex-direction: column; gap: 8px; }
.tw-row label { font-size: 11px; font-family: var(--mono-font); letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-muted); }
.tw-row input[type="range"] {
  width: 100%; accent-color: var(--accent);
}
.tw-val { display: flex; align-items: center; gap: 8px; font-family: var(--mono-font); font-size: 11px; color: var(--ink-soft); }
.tw-swatch { width: 12px; height: 12px; border-radius: 3px; border: 1px solid var(--border-strong); }
.tw-row-choice { flex-direction: row; justify-content: space-between; align-items: center; }
.tw-choices { display: flex; gap: 4px; }
.tw-ch {
  min-width: 36px; height: 34px; padding: 0 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 15px; color: var(--ink-muted);
  transition: all .15s;
}
.tw-ch-txt { font-size: 11px; font-family: var(--mono-font); letter-spacing: 0.05em; }
.tw-ch:hover { border-color: var(--border-strong); color: var(--ink-soft); }
.tw-ch.active { background: var(--ink); color: var(--bg); border-color: var(--ink); }

/* ═══════════════ RESPONSIVE ═══════════════ */
@media (max-width: 720px) {
  .topbar-inner { padding: 12px 20px; }
  .topbar-progress { padding: 4px 10px 4px 4px; }
  .tp-lbl { display: none; }
  .brand-sub { display: none; }
  .home { padding: 0 20px 80px; }
  .hero { padding: 60px 0 60px; }
  .hero-meta { padding: 16px 20px; gap: 20px; }
  .lesson { padding: 20px 20px 80px; }
  .lesson-card { padding: 32px 24px; }
  .lh-def { font-size: 17px; }
  .tweaks { width: calc(100vw - 32px); right: 16px; bottom: 16px; }
  .lb-dots { display: none; }
}