/* ============================================================
   AUREUM MRCOG — design system
   Deep-space navy, luminous teal→violet gradient accents and a
   gold "achievement" hue. Serif display for headlines, humanist
   sans for the interface.
   ============================================================ */

:root {
  --bg: #0a0c18;
  --surface: #12152b;
  --surface-2: #181c38;
  --hairline: rgba(255, 255, 255, 0.08);
  --ink: #f4f5fb;
  --ink-2: #a7abc4;
  --ink-3: #7c8099;
  --teal: #5eead4;
  --violet: #a78bfa;
  --gold: #f4c95d;
  --blue: #3987e5;
  --good: #34d399;
  --bad: #f87171;
  --grad: linear-gradient(100deg, var(--teal), var(--violet));
  --radius: 18px;
  --font-display: "Fraunces", "Georgia", serif;
  --font-ui: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-ui);
  background:
    radial-gradient(1200px 700px at 80% -10%, rgba(94, 234, 212, 0.07), transparent 60%),
    radial-gradient(1000px 700px at 10% 110%, rgba(167, 139, 250, 0.09), transparent 60%),
    var(--bg);
  color: var(--ink);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

#bg-canvas {
  position: fixed; inset: 0;
  width: 100vw; height: 100vh;
  z-index: 0; pointer-events: none;
}

a { color: var(--teal); text-decoration: none; }
.link { color: var(--teal); }
.link:hover { text-decoration: underline; }
.muted { color: var(--ink-2); }
.good { color: var(--good); }
.bad { color: var(--bad); }
.gold { color: var(--gold); }
kbd {
  background: var(--surface-2); border: 1px solid var(--hairline);
  border-radius: 5px; padding: 1px 6px; font-size: 0.78em; font-family: var(--font-ui);
}

/* ---------------- nav ---------------- */

#nav {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px clamp(20px, 5vw, 56px);
  backdrop-filter: blur(14px);
  background: rgba(10, 12, 24, 0.72);
  border-bottom: 1px solid var(--hairline);
}

.brand {
  font-family: var(--font-display);
  font-weight: 700; font-size: 1.15rem; letter-spacing: 0.14em;
  color: var(--ink); display: flex; align-items: baseline; gap: 8px;
}
.brand-mark {
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.brand-sub { font-size: 0.62rem; color: var(--gold); letter-spacing: 0.3em; }

.nav-links { display: flex; align-items: center; gap: clamp(10px, 2.5vw, 26px); }
.nav-links a:not(.btn) {
  color: var(--ink-2); font-size: 0.92rem; letter-spacing: 0.02em;
  padding: 6px 2px; border-bottom: 2px solid transparent; transition: color 0.2s;
}
.nav-links a:not(.btn):hover { color: var(--ink); }
.nav-links a.active { color: var(--ink); border-bottom-color: var(--teal); }

/* ---------------- layout ---------------- */

.view { position: relative; z-index: 1; }

.page {
  max-width: 1080px; margin: 0 auto;
  padding: clamp(28px, 5vw, 56px) clamp(20px, 5vw, 40px) 90px;
}
.page.narrow { max-width: 820px; }

.kicker {
  color: var(--gold); font-size: 0.75rem; font-weight: 600;
  letter-spacing: 0.28em; text-transform: uppercase; margin-bottom: 6px;
}

.page-title {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4vw, 2.7rem);
  font-weight: 600; line-height: 1.15; margin-bottom: 8px;
}

.card {
  background: linear-gradient(180deg, rgba(255,255,255,0.025), rgba(255,255,255,0)) , var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  padding: clamp(18px, 3vw, 28px);
  margin-top: 22px;
  box-shadow: var(--shadow);
}
.card-title {
  font-size: 0.8rem; font-weight: 600; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--ink-2); margin-bottom: 14px;
}

/* ---------------- buttons ---------------- */

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-family: var(--font-ui); font-weight: 600; font-size: 0.95rem;
  border-radius: 999px; border: 1px solid transparent;
  padding: 12px 26px; cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease, border-color 0.18s;
  color: var(--ink); background: transparent; text-decoration: none;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn[disabled] { opacity: 0.4; pointer-events: none; }

.btn-primary { background: var(--grad); color: #081018; }
.btn-primary:hover { box-shadow: 0 10px 30px rgba(94, 234, 212, 0.25); }

.btn-gold {
  background: linear-gradient(100deg, #f4c95d, #e8a33d);
  color: #241a05;
}
.btn-gold:hover { box-shadow: 0 10px 30px rgba(244, 201, 93, 0.28); }

.btn-ghost { border-color: var(--hairline); color: var(--ink-2); }
.btn-ghost:hover { color: var(--ink); border-color: rgba(255,255,255,0.25); }

.btn-danger { border: 1px solid rgba(248,113,113,0.4); color: var(--bad); }
.btn-danger:hover { background: rgba(248,113,113,0.1); }

.btn-lg { padding: 15px 34px; font-size: 1.02rem; }
.btn-sm { padding: 8px 16px; font-size: 0.85rem; }
.btn-block { width: 100%; }

/* ---------------- chips ---------------- */

.chip {
  display: inline-block; font-size: 0.68rem; font-weight: 700;
  letter-spacing: 0.14em; padding: 4px 12px; border-radius: 999px;
}
.chip-sba { background: rgba(94, 234, 212, 0.14); color: var(--teal); }
.chip-emq { background: rgba(167, 139, 250, 0.16); color: var(--violet); }

/* ---------------- hero ---------------- */

.hero {
  min-height: calc(88vh - 70px);
  display: flex; flex-direction: column; justify-content: center; align-items: center;
  text-align: center; padding: 40px 20px 30px;
  position: relative;
}

.hero-kicker {
  color: var(--gold); letter-spacing: 0.34em; font-size: 0.72rem; font-weight: 600;
  margin-bottom: 22px;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 8vw, 5.4rem);
  line-height: 1.04; font-weight: 600; perspective: 600px;
}
.hero-title .line { display: block; }
.hero-title .grad {
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}

.hero-sub {
  max-width: 620px; margin: 26px auto 0; color: var(--ink-2);
  font-size: clamp(0.98rem, 2vw, 1.1rem);
}

.hero-cta { margin-top: 36px; display: flex; gap: 14px; flex-wrap: wrap; justify-content: center; }

.hero-stats { display: flex; gap: clamp(22px, 6vw, 64px); margin-top: 56px; }
.hero-stat { text-align: center; }
.hero-stat strong {
  display: block; font-family: var(--font-display); font-size: 1.9rem; color: var(--ink);
}
.hero-stat span { font-size: 0.72rem; letter-spacing: 0.2em; text-transform: uppercase; color: var(--ink-3); }

.feature-band {
  max-width: 1080px; margin: 0 auto; padding: 30px clamp(20px, 5vw, 40px) 110px;
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px;
}
.feature {
  background: var(--surface); border: 1px solid var(--hairline);
  border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow);
}
.feature-icon { font-size: 1.6rem; display: block; margin-bottom: 14px; }
.feature h3 { font-family: var(--font-display); font-size: 1.15rem; margin-bottom: 8px; }
.feature p { color: var(--ink-2); font-size: 0.92rem; }

/* ---------------- auth ---------------- */

.auth-page { display: flex; justify-content: center; }
.auth-card {
  width: 100%; max-width: 440px; margin-top: 4vh;
  background: var(--surface); border: 1px solid var(--hairline);
  border-radius: var(--radius); padding: clamp(26px, 4vw, 40px);
  box-shadow: var(--shadow);
}
.auth-card form { margin-top: 22px; display: grid; gap: 16px; }

.field span {
  display: block; font-size: 0.78rem; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--ink-3); margin-bottom: 6px;
}
.field input {
  width: 100%; padding: 13px 16px; font-size: 1rem; color: var(--ink);
  background: var(--surface-2); border: 1px solid var(--hairline); border-radius: 12px;
  outline: none; transition: border-color 0.2s, box-shadow 0.2s;
  font-family: var(--font-ui);
}
.field input:focus { border-color: var(--teal); box-shadow: 0 0 0 3px rgba(94,234,212,0.15); }

.form-error {
  color: var(--bad); font-size: 0.9rem;
  background: rgba(248,113,113,0.08); border: 1px solid rgba(248,113,113,0.25);
  padding: 10px 14px; border-radius: 10px; white-space: pre-line;
}
.auth-swap { margin-top: 18px; text-align: center; color: var(--ink-2); font-size: 0.92rem; }
.auth-note { margin-top: 16px; font-size: 0.78rem; color: var(--ink-3); text-align: center; }

/* ---------------- dashboard ---------------- */

.dash-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 18px; flex-wrap: wrap; }

.level-banner {
  margin-top: 26px; display: flex; align-items: center; gap: clamp(16px, 3vw, 30px);
  background:
    radial-gradient(500px 200px at 0% 0%, rgba(244,201,93,0.10), transparent 70%),
    var(--surface);
  border: 1px solid rgba(244, 201, 93, 0.25);
  border-radius: var(--radius); padding: clamp(18px, 3vw, 28px);
  box-shadow: var(--shadow);
}
.level-emblem {
  font-size: 2.6rem; line-height: 1;
  background: linear-gradient(100deg, var(--gold), #fff2cf);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  filter: drop-shadow(0 0 14px rgba(244,201,93,0.35));
}
.level-info { flex: 1; min-width: 200px; }
.level-name { font-family: var(--font-display); font-size: 1.2rem; margin-bottom: 8px; }
.level-bar {
  height: 10px; border-radius: 999px; background: var(--surface-2);
  overflow: hidden; border: 1px solid var(--hairline);
}
.level-bar span { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--gold), #ffe6a6); border-radius: 999px; }
.level-next { font-size: 0.82rem; margin-top: 7px; }
.level-xp { text-align: center; }
.level-xp strong { display: block; font-family: var(--font-display); font-size: 2rem; color: var(--gold); }
.level-xp span { font-size: 0.7rem; letter-spacing: 0.2em; text-transform: uppercase; color: var(--ink-3); }

.stat-row {
  margin-top: 20px; display: grid; gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
}
.stat-tile {
  background: var(--surface); border: 1px solid var(--hairline); border-radius: var(--radius);
  padding: 20px; text-align: center; box-shadow: var(--shadow);
}
.stat-tile strong { display: block; font-family: var(--font-display); font-size: 2rem; }
.stat-tile span { font-size: 0.72rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-3); }
.ring-tile { display: flex; justify-content: center; padding: 10px; }

.dash-grid { display: grid; gap: 20px; grid-template-columns: 1fr 1fr; }
@media (max-width: 860px) { .dash-grid { grid-template-columns: 1fr; } }

/* ---------------- charts ---------------- */

.chart-host { position: relative; }
.chart-svg { width: 100%; height: auto; display: block; font-family: var(--font-ui); }
.chart-empty { color: var(--ink-3); font-size: 0.9rem; padding: 26px 0; text-align: center; }
.chart-hit { cursor: pointer; }
.chart-tip {
  position: absolute; transform: translate(-50%, -100%);
  background: #060814; border: 1px solid var(--hairline); border-radius: 10px;
  padding: 8px 12px; font-size: 0.8rem; color: var(--ink); pointer-events: none;
  white-space: nowrap; box-shadow: var(--shadow); z-index: 5;
}
.chart-tip span { color: var(--ink-3); }
.ring-svg { width: 120px; height: 120px; font-family: var(--font-ui); }

/* ---------------- tables ---------------- */

.table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
.table th {
  text-align: left; font-size: 0.7rem; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--ink-3); font-weight: 600; padding: 8px 10px;
  border-bottom: 1px solid var(--hairline);
}
.table td { padding: 12px 10px; border-bottom: 1px solid var(--hairline); vertical-align: middle; }
.table tr:last-child td { border-bottom: none; }

/* ---------------- library ---------------- */

.curriculum-block { margin-top: 40px; }
.curriculum-title {
  font-family: var(--font-display); font-size: 1.6rem;
  border-bottom: 1px solid var(--hairline); padding-bottom: 10px;
}
.section-block { margin-top: 24px; }
.section-title {
  font-size: 0.82rem; font-weight: 600; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--teal); margin-bottom: 14px;
}
.topic-grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); }

.topic-card {
  display: block; background: var(--surface); border: 1px solid var(--hairline);
  border-radius: var(--radius); padding: 20px; color: var(--ink);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  box-shadow: var(--shadow);
}
.topic-card:hover { transform: translateY(-4px); border-color: rgba(94,234,212,0.45); }
.topic-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.topic-card h4 { font-family: var(--font-display); font-size: 1.08rem; font-weight: 600; margin-bottom: 4px; }
.topic-card .muted { font-size: 0.82rem; }
.best { font-size: 0.75rem; font-weight: 700; color: var(--ink-2); }
.best.good { color: var(--good); }
.best.new { color: var(--gold); letter-spacing: 0.14em; }
.topic-meter {
  margin-top: 14px; height: 5px; background: var(--surface-2);
  border-radius: 999px; overflow: hidden;
}
.topic-meter span { display: block; height: 100%; background: var(--grad); border-radius: 999px; }

/* ---------------- topic detail ---------------- */

.topic-detail .detail-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 14px; text-align: center; margin-bottom: 20px;
}
.detail-grid strong { display: block; font-family: var(--font-display); font-size: 1.5rem; }
.detail-grid span { font-size: 0.7rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-3); }
.emq-note { font-size: 0.88rem; margin-bottom: 18px; }
.detail-actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* ---------------- quiz ---------------- */

.quiz-shell { max-width: 1080px; margin: 0 auto; padding: clamp(20px, 4vw, 40px) clamp(16px, 4vw, 40px) 80px; }

.quiz-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; flex-wrap: wrap; }
.quiz-title { font-family: var(--font-display); font-size: clamp(1.3rem, 3vw, 1.8rem); margin-top: 8px; }
.quiz-crumb { color: var(--ink-3); font-size: 0.85rem; }
.quiz-head-right { display: flex; align-items: center; gap: 14px; }
.quiz-timer {
  font-variant-numeric: tabular-nums; font-weight: 700; font-size: 1.25rem;
  background: var(--surface); border: 1px solid var(--hairline);
  border-radius: 12px; padding: 8px 16px; color: var(--teal);
}
.quiz-timer.timer-low { color: var(--bad); border-color: rgba(248,113,113,0.5); animation: timerPulse 1s infinite; }
@keyframes timerPulse { 50% { box-shadow: 0 0 0 5px rgba(248,113,113,0.12); } }

.quiz-progressbar {
  margin: 18px 0 26px; height: 6px; border-radius: 999px;
  background: var(--surface-2); overflow: hidden;
}
.quiz-progressbar span {
  display: block; height: 100%; background: var(--grad);
  border-radius: 999px; transition: width 0.4s ease;
}

.quiz-body { display: grid; grid-template-columns: 1fr 240px; gap: 26px; align-items: start; }
@media (max-width: 900px) { .quiz-body { grid-template-columns: 1fr; } .quiz-side { order: -1; } }

.emq-theme {
  background: rgba(167,139,250,0.08); border: 1px solid rgba(167,139,250,0.25);
  border-radius: 14px; padding: 16px 20px; margin-bottom: 20px;
}
.emq-theme h3 { font-family: var(--font-display); font-size: 1.05rem; color: var(--violet); }
.emq-theme p { font-size: 0.85rem; color: var(--ink-2); margin-top: 4px; }

.q-number { font-size: 0.75rem; letter-spacing: 0.2em; text-transform: uppercase; color: var(--gold); margin-bottom: 10px; }
.q-stem { font-size: clamp(1.02rem, 2vw, 1.14rem); line-height: 1.65; margin-bottom: 24px; }

.q-options { display: grid; gap: 10px; }
.q-options-emq { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }

.q-option {
  display: flex; align-items: flex-start; gap: 14px; text-align: left;
  background: var(--surface); border: 1px solid var(--hairline);
  border-radius: 14px; padding: 14px 18px; cursor: pointer;
  color: var(--ink); font-size: 0.97rem; font-family: var(--font-ui); line-height: 1.5;
  transition: border-color 0.15s, background 0.15s, transform 0.15s;
}
.q-option:hover { border-color: rgba(94,234,212,0.5); transform: translateX(3px); }
.q-option.selected {
  border-color: var(--teal);
  background: rgba(94, 234, 212, 0.09);
  box-shadow: 0 0 0 1px var(--teal) inset;
}
.q-letter {
  flex: none; width: 28px; height: 28px; border-radius: 8px;
  display: grid; place-items: center; font-weight: 700; font-size: 0.85rem;
  background: var(--surface-2); color: var(--ink-2);
}
.q-option.selected .q-letter { background: var(--teal); color: #06251e; }

.palette-card {
  background: var(--surface); border: 1px solid var(--hairline);
  border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow);
}
.palette-card h4 {
  font-size: 0.72rem; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--ink-3); margin-bottom: 12px;
}
.palette-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; }
.palette-cell {
  aspect-ratio: 1; border-radius: 10px; border: 1px solid var(--hairline);
  background: var(--surface-2); color: var(--ink-2); font-weight: 600; cursor: pointer;
  font-size: 0.85rem; transition: all 0.15s; font-family: var(--font-ui);
}
.palette-cell:hover { border-color: var(--teal); color: var(--ink); }
.palette-cell.done { background: rgba(94,234,212,0.16); color: var(--teal); border-color: rgba(94,234,212,0.35); }
.palette-cell.flagged { box-shadow: 0 0 0 2px var(--gold); }
.palette-cell.current { border-color: var(--ink); color: var(--ink); }

.palette-legend { display: flex; gap: 16px; margin-top: 14px; font-size: 0.75rem; color: var(--ink-3); }
.dot { display: inline-block; width: 9px; height: 9px; border-radius: 50%; margin-right: 5px; }
.dot-done { background: var(--teal); }
.dot-flag { background: var(--gold); }

.quiz-hint { margin-top: 14px; font-size: 0.78rem; color: var(--ink-3); }

.quiz-foot {
  margin-top: 34px; display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap;
}
.flag-on { color: var(--gold); border-color: rgba(244,201,93,0.5); }

/* ---------------- results ---------------- */

.results-page { text-align: left; }
.results-head { text-align: center; position: relative; padding: 20px 0 10px; }
.score-hero {
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(4rem, 12vw, 7rem); line-height: 1;
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  margin: 18px 0 6px;
}
.verdict { font-size: 1.1rem; font-weight: 600; letter-spacing: 0.04em; }
.results-actions { display: flex; gap: 12px; justify-content: center; margin-top: 24px; flex-wrap: wrap; }

.review-title { font-family: var(--font-display); font-size: 1.5rem; margin: 46px 0 18px; }
.review-list { display: grid; gap: 16px; }
.review-item {
  background: var(--surface); border: 1px solid var(--hairline);
  border-left: 4px solid var(--ink-3);
  border-radius: var(--radius); padding: 20px 24px;
}
.review-item.r-correct { border-left-color: var(--good); }
.review-item.r-wrong { border-left-color: var(--bad); }
.review-item-head { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.r-badge { font-weight: 700; font-size: 1.05rem; }
.r-correct .r-badge { color: var(--good); }
.r-wrong .r-badge { color: var(--bad); }
.r-num { font-size: 0.75rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-3); }
.review-item .q-stem { font-size: 0.97rem; margin-bottom: 12px; }
.r-line { font-size: 0.92rem; margin-bottom: 4px; }
.r-expl {
  margin-top: 12px; padding: 14px 16px; font-size: 0.9rem; color: var(--ink-2);
  background: var(--surface-2); border-radius: 12px;
}
.r-ref { margin-top: 8px; font-size: 0.78rem; color: var(--gold); font-style: italic; }

/* confetti */
.confetti-layer { position: absolute; inset: 0; overflow: visible; pointer-events: none; z-index: 3; }
.confetti-bit {
  position: absolute; top: 10%; width: 9px; height: 14px;
  border-radius: 2px; opacity: 1;
}

/* ---------------- profile ---------------- */

.ladder { list-style: none; display: grid; gap: 4px; }
.ladder-step {
  display: flex; align-items: center; gap: 14px;
  padding: 12px 16px; border-radius: 12px; color: var(--ink-3);
  border: 1px solid transparent;
}
.ladder-step.passed { color: var(--ink-2); }
.ladder-step.passed .ladder-emblem { color: var(--teal); }
.ladder-step.current {
  color: var(--ink);
  background: rgba(244,201,93,0.07);
  border-color: rgba(244,201,93,0.35);
}
.ladder-step.current .ladder-emblem { color: var(--gold); filter: drop-shadow(0 0 8px rgba(244,201,93,0.5)); }
.ladder-emblem { width: 26px; text-align: center; font-size: 1.15rem; }
.ladder-name { flex: 1; font-weight: 500; }
.ladder-xp { font-size: 0.8rem; font-variant-numeric: tabular-nums; }

.danger-zone { display: grid; gap: 12px; justify-items: start; }

/* ---------------- misc ---------------- */

::selection { background: rgba(94,234,212,0.3); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

/* ================= v2 additions (Pathway to MD) ================= */

.tiny { font-size: 0.75rem; }
.table-scroll { overflow-x: auto; }

/* countdown on landing */
.countdown {
  margin-top: 30px; display: flex; flex-direction: column; align-items: center; gap: 6px;
}
.cd-number { display: flex; flex-direction: column; align-items: center; }
.cd-number strong {
  font-family: var(--font-display); font-weight: 700; font-size: clamp(3rem, 9vw, 5rem);
  line-height: 1; background: linear-gradient(100deg, var(--gold), #ffe6a6);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.cd-number span { font-size: 0.72rem; letter-spacing: 0.24em; text-transform: uppercase; color: var(--ink-3); }
.cd-date { font-size: 0.9rem; color: var(--ink-2); }
.cd-date strong { color: var(--ink); }

.chip-mode { background: rgba(244,201,93,0.14); color: var(--gold); margin-left: 6px; }

/* dashboard banner row */
.banner-row { display: grid; grid-template-columns: 1fr 200px; gap: 16px; }
@media (max-width: 720px) { .banner-row { grid-template-columns: 1fr; } }
.banner-row .level-banner { margin-top: 26px; }
.exam-chip {
  margin-top: 26px; display: flex; flex-direction: column; align-items: center; justify-content: center;
  background: var(--surface); border: 1px solid var(--hairline); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 18px; text-align: center;
}
.exam-chip strong { font-family: var(--font-display); font-size: 2.4rem; color: var(--teal); }
.exam-chip span { font-size: 0.68rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-3); }
.exam-chip.soon strong { color: var(--gold); }
.exam-chip.past strong { color: var(--ink-3); }

/* question lead line */
.q-lead { font-weight: 600; font-size: 1.02rem; margin: -12px 0 20px; color: var(--ink); }

/* option correctness (study mode + review) */
.q-option.correct { border-color: var(--good); background: rgba(52,211,153,0.10); box-shadow: 0 0 0 1px var(--good) inset; }
.q-option.incorrect { border-color: var(--bad); background: rgba(248,113,113,0.09); box-shadow: 0 0 0 1px var(--bad) inset; }
.q-option[disabled] { cursor: default; opacity: 1; }
.q-option .q-text { flex: 1; }
.opt-mark { font-weight: 700; margin-left: auto; }
.opt-mark.good { color: var(--good); }
.opt-mark.bad { color: var(--bad); }

/* study-mode inline feedback */
.quiz-body-study { grid-template-columns: 1fr; }
#q-feedback { margin-top: 18px; }
.feedback {
  border-radius: 14px; padding: 16px 20px; border: 1px solid var(--hairline);
  background: var(--surface-2);
}
.feedback.fb-correct { border-left: 4px solid var(--good); }
.feedback.fb-wrong { border-left: 4px solid var(--bad); }
.fb-verdict { font-weight: 700; margin-bottom: 8px; }
.fb-correct .fb-verdict { color: var(--good); }
.fb-wrong .fb-verdict { color: var(--bad); }
.fb-rationale { font-size: 0.92rem; color: var(--ink-2); }
.fb-hook { margin-top: 10px; font-size: 0.9rem; color: var(--gold); }
.fb-ref { margin-top: 8px; font-size: 0.78rem; color: var(--ink-3); font-style: italic; }
.study-score { color: var(--ink-2); font-size: 0.9rem; }
.study-score strong { color: var(--ink); }

/* review hook */
.r-hook { margin-top: 8px; font-size: 0.85rem; color: var(--gold); }

/* library search + tree */
.lib-search { display: flex; gap: 12px; align-items: center; margin: 22px 0 10px; flex-wrap: wrap; }
.lib-search input[type=search] {
  flex: 1; min-width: 220px; padding: 13px 18px; font-size: 1rem; font-family: var(--font-ui);
  background: var(--surface-2); border: 1px solid var(--hairline); border-radius: 999px; color: var(--ink); outline: none;
}
.lib-search input[type=search]:focus { border-color: var(--teal); box-shadow: 0 0 0 3px rgba(94,234,212,0.15); }
.lib-tools { display: flex; gap: 8px; }
.lib-results-count { margin-bottom: 12px; }

.tree-category, .tree-section { border-bottom: 1px solid var(--hairline); }
.tree-category { margin-top: 6px; }
.tree-category > summary {
  cursor: pointer; list-style: none; padding: 16px 4px;
  font-family: var(--font-display); font-size: 1.35rem; display: flex; align-items: center; gap: 12px;
}
.tree-section > summary {
  cursor: pointer; list-style: none; padding: 12px 4px 12px 20px;
  font-size: 0.82rem; font-weight: 600; letter-spacing: 0.16em; text-transform: uppercase; color: var(--teal);
  display: flex; align-items: center; gap: 10px;
}
summary::-webkit-details-marker { display: none; }
.tw-caret { display: inline-block; transition: transform 0.2s; color: var(--ink-3); font-size: 0.8em; }
details[open] > summary .tw-caret { transform: rotate(90deg); }
.tw-count {
  margin-left: auto; font-size: 0.7rem; font-weight: 700; color: var(--ink-3);
  background: var(--surface-2); border-radius: 999px; padding: 2px 10px; letter-spacing: 0;
}
.tree-sections { padding-left: 10px; }
.tree-topics { padding: 6px 0 16px 24px; }
.tree-topic { margin-top: 14px; }
.tree-topic-title { font-size: 0.9rem; font-weight: 600; color: var(--ink-2); margin-bottom: 10px; }
.empty-cat, .paper-desc { padding: 4px; }
.paper-desc { color: var(--ink-2); margin-top: 8px; }

.paper-grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); }
.lib-results .paper-grid { margin-top: 6px; }
.paper-card {
  display: block; background: var(--surface); border: 1px solid var(--hairline);
  border-radius: 16px; padding: 18px; color: var(--ink); box-shadow: var(--shadow);
  transition: transform 0.2s, border-color 0.2s;
}
.paper-card:hover { transform: translateY(-4px); border-color: rgba(94,234,212,0.45); }
.paper-badges { display: flex; gap: 6px; margin-bottom: 10px; }
.paper-card h4 { font-family: var(--font-display); font-size: 1.05rem; margin-bottom: 4px; }
.paper-source { font-size: 0.8rem; }
.paper-foot { display: flex; gap: 10px; margin-top: 12px; align-items: center; }

/* run cards (paper detail) */
.run-grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); margin-top: 24px; }
.run-card { background: var(--surface); border: 1px solid var(--hairline); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); }
.run-head { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.run-count { font-weight: 600; }
.run-best { font-size: 0.85rem; margin-bottom: 16px; }
.run-actions { display: grid; gap: 10px; }
.mode-note { margin-top: 20px; font-size: 0.85rem; }

/* position picker */
.position-picker { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 6px; }
.pos-btn {
  padding: 12px 22px; border-radius: 999px; border: 1px solid var(--hairline);
  background: var(--surface-2); color: var(--ink-2); font-family: var(--font-ui); font-weight: 600; cursor: pointer;
  transition: all 0.15s;
}
.pos-btn:hover { color: var(--ink); border-color: rgba(255,255,255,0.25); }
.pos-btn.active { background: var(--grad); color: #081018; border-color: transparent; }
.save-note { color: var(--good); font-size: 0.85rem; margin-top: 10px; }

/* developer console */
.dev-toolbar { display: flex; align-items: center; gap: 16px; margin: 20px 0; flex-wrap: wrap; }
.dev-status { color: var(--ink-2); font-size: 0.9rem; }
.dev-row { margin-top: 14px; }
.dev-row-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; margin-bottom: 14px; }
.dev-file { font-weight: 600; }
.dev-classify { display: grid; grid-template-columns: repeat(3, 1fr) auto; gap: 12px; align-items: end; }
@media (max-width: 760px) { .dev-classify { grid-template-columns: 1fr; } }
.dev-classify label { display: flex; flex-direction: column; gap: 6px; font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-3); }
.dev-classify select {
  padding: 10px 12px; background: var(--surface-2); border: 1px solid var(--hairline); border-radius: 10px;
  color: var(--ink); font-family: var(--font-ui); font-size: 0.9rem;
}
.dev-row-msg { margin-top: 12px; font-size: 0.88rem; }
.dev-row-msg.good { color: var(--good); }
.dev-row-msg.bad { color: var(--bad); }
.dev-done { opacity: 0.6; }
.dev-textarea {
  width: 100%; min-height: 160px; margin-top: 10px; font-family: ui-monospace, monospace; font-size: 0.82rem;
  background: var(--surface-2); color: var(--ink); border: 1px solid var(--hairline); border-radius: 12px; padding: 14px; resize: vertical;
}
.link-btn { background: none; border: none; color: var(--bad); cursor: pointer; font-size: 0.85rem; text-decoration: underline; }

/* ================= v3: exam-date picker + reimagined library ================= */

/* exam date picker on the hero countdown */
.cd-picker {
  display: inline-flex; align-items: center; gap: 10px; margin-top: 6px;
  padding: 8px 14px; border-radius: 999px;
  background: var(--surface); border: 1px solid var(--hairline);
  cursor: pointer; transition: border-color 0.2s, box-shadow 0.2s;
}
.cd-picker:hover { border-color: rgba(244,201,93,0.5); box-shadow: 0 6px 22px rgba(244,201,93,0.14); }
.cd-picker-label { font-size: 0.8rem; letter-spacing: 0.04em; color: var(--ink-2); }
.cd-picker input[type=date] {
  background: transparent; border: none; outline: none; color: var(--gold);
  font-family: var(--font-ui); font-weight: 600; font-size: 0.9rem; cursor: pointer;
  color-scheme: dark;
}

/* library search field with icon */
.lib-search { position: relative; }
.lib-search-ico {
  position: absolute; left: 20px; top: 50%; transform: translateY(-50%);
  color: var(--ink-3); font-size: 1.15rem; pointer-events: none;
}
.lib-search input[type=search] { padding-left: 46px; }

/* category filter chips */
.lib-filters { display: flex; flex-wrap: wrap; gap: 10px; margin: 4px 0 26px; }
.filter-chip {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 8px 16px; border-radius: 999px; cursor: pointer;
  background: var(--surface); border: 1px solid var(--hairline);
  color: var(--ink-2); font-family: var(--font-ui); font-weight: 600; font-size: 0.86rem;
  transition: color 0.18s, border-color 0.18s, transform 0.18s, background 0.18s;
}
.filter-chip:hover { color: var(--ink); transform: translateY(-2px); border-color: rgba(255,255,255,0.22); }
.filter-chip.active { color: var(--ink); border-color: transparent; background: rgba(255,255,255,0.08); }
.filter-chip span { font-size: 0.72rem; color: var(--ink-3); background: var(--surface-2); border-radius: 999px; padding: 1px 8px; }
.filter-chip.active span { color: var(--ink-2); }
.fc-dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }

/* chapter (category) cards */
.chapter {
  position: relative; margin-top: 20px; padding: clamp(18px, 3vw, 26px);
  background:
    radial-gradient(600px 180px at 0% 0%, var(--chapter-glow), transparent 70%),
    var(--surface);
  border: 1px solid var(--hairline); border-radius: 22px; box-shadow: var(--shadow);
  overflow: hidden;
}
.chapter::before {
  content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 4px;
  background: var(--chapter-glow);
}
.chapter-head { display: flex; align-items: center; gap: 16px; margin-bottom: 6px; }
.chapter-medallion {
  flex: none; width: 54px; height: 54px; border-radius: 16px;
  display: grid; place-items: center; color: #06131f;
  font-family: var(--font-display); font-weight: 700; font-size: 1.6rem;
  box-shadow: 0 8px 22px rgba(0,0,0,0.3);
}
.chapter-heading { flex: 1; }
.chapter-heading h2 { font-family: var(--font-display); font-size: clamp(1.4rem, 3vw, 1.9rem); font-weight: 600; }
.chapter-heading p { font-size: 0.85rem; margin-top: 2px; }
.chapter-count {
  flex: none; min-width: 40px; height: 40px; padding: 0 12px; border-radius: 999px;
  display: grid; place-items: center; color: #06131f; font-weight: 700; font-size: 1rem;
}
.chapter-sections { margin-top: 14px; }

/* section accordions */
.chapter-section { border-top: 1px solid var(--hairline); }
.chapter-section:first-child { border-top: none; }
.chapter-section > summary {
  cursor: pointer; list-style: none; display: flex; align-items: center; gap: 12px;
  padding: 15px 4px; font-size: 0.82rem; font-weight: 700; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--ink-2); transition: color 0.18s;
}
.chapter-section > summary:hover { color: var(--ink); }
.chapter-section > summary::-webkit-details-marker { display: none; }
.cs-caret { color: var(--ink-3); font-size: 0.75em; transition: transform 0.25s ease; display: inline-block; }
.chapter-section[open] > summary .cs-caret { transform: rotate(90deg); }
.cs-title { flex: 1; }
.cs-count { font-size: 0.7rem; font-weight: 700; color: var(--ink-3); background: var(--surface-2); border-radius: 999px; padding: 2px 10px; letter-spacing: 0; }
.cs-body { padding: 4px 0 18px; }

.topic-group { margin-top: 14px; }
.topic-group:first-child { margin-top: 2px; }
.topic-group-title {
  font-size: 0.82rem; font-weight: 600; color: var(--teal);
  margin-bottom: 12px; padding-left: 12px; border-left: 2px solid rgba(94,234,212,0.4);
}

/* reimagined paper cards */
.paper-grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(255px, 1fr)); }
.paper-card {
  position: relative; display: flex; flex-direction: column; overflow: hidden;
  background: var(--surface-2); border: 1px solid var(--hairline);
  border-radius: 16px; padding: 18px; color: var(--ink);
  box-shadow: 0 10px 30px rgba(0,0,0,0.28);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.paper-card::before {
  content: ''; position: absolute; left: 0; right: 0; top: 0; height: 3px;
  background: var(--card-accent, var(--grad)); opacity: 0.85;
}
.paper-card:hover { transform: translateY(-6px); border-color: rgba(255,255,255,0.2); box-shadow: 0 18px 40px rgba(0,0,0,0.4); }
.paper-badges { display: flex; gap: 6px; margin-bottom: 12px; flex-wrap: wrap; }
.chip-new { background: rgba(244,201,93,0.16); color: var(--gold); }
.paper-card h4 { font-family: var(--font-display); font-size: 1.05rem; line-height: 1.25; margin-bottom: 6px; }
.paper-source { font-size: 0.78rem; flex: 1; }
.paper-meter { height: 5px; border-radius: 999px; background: rgba(255,255,255,0.06); overflow: hidden; margin: 14px 0 12px; }
.paper-meter span { display: block; height: 100%; background: var(--card-accent, var(--grad)); border-radius: 999px; }
.paper-foot { display: flex; align-items: center; justify-content: space-between; }
.paper-foot .best { font-size: 0.78rem; font-weight: 700; color: var(--ink-2); }
.paper-foot .best.good { color: var(--good); }
.paper-go { font-size: 0.8rem; font-weight: 600; color: var(--teal); opacity: 0; transform: translateX(-6px); transition: all 0.2s; }
.paper-card:hover .paper-go { opacity: 1; transform: translateX(0); }

.lib-empty { margin-top: 26px; text-align: center; font-size: 0.88rem; }