/* ==========================================================================
   ChallengeChain — Design System
   Tokens supplied by the client (front). Components extend this system.
   ========================================================================== */

:root {
  /* Colors */
  --color-carbon: #000000;
  --color-paper-white: #ffffff;
  --color-sky-wash: #dceeff;
  --color-concrete-gray: #cccccc;
  --color-soft-mist: #e9e9e9;
  --color-electric-blue: #4da2ff;
  --color-mint-pop: #55db9c;
  --color-lavender: #e9ccff;
  --color-ember: #fb4903;
  --color-sunburst: #ffd731;
  --color-voltage-violet: #5c4ade;

  /* Typography — Font Families */
  --font-lateral: 'Lateral', ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-aeonik-pro: 'Aeonik Pro', ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  /* Typography — Scale */
  --text-caption: 12px;
  --leading-caption: 1.56;
  --tracking-caption: -0.01px;
  --text-body-lg: 15px;
  --leading-body-lg: 1.39;
  --tracking-body-lg: -0.01px;
  --text-subheading: 24px;
  --leading-subheading: 1.2;
  --tracking-subheading: -0.01px;
  --text-heading-sm: 30px;
  --leading-heading-sm: 1.1;
  --tracking-heading-sm: -0.01px;
  --text-heading: 64px;
  --leading-heading: 1;
  --tracking-heading: -0.01px;
  --text-display: 200px;
  --leading-display: 0.8;
  --tracking-display: 0px;

  /* Typography — Weights */
  --font-weight-medium: 500;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;

  /* Spacing */
  --spacing-unit: 4px;
  --spacing-4: 4px;
  --spacing-8: 8px;
  --spacing-12: 12px;
  --spacing-16: 16px;
  --spacing-20: 20px;
  --spacing-24: 24px;
  --spacing-28: 28px;
  --spacing-32: 32px;
  --spacing-40: 40px;
  --spacing-44: 44px;
  --spacing-48: 48px;
  --spacing-60: 60px;
  --spacing-80: 80px;
  --spacing-128: 128px;
  --spacing-180: 180px;
  --spacing-224: 224px;

  /* Layout */
  --page-max-width: 1440px;
  --section-gap: 48px;
  --card-padding: 24px;
  --element-gap: 4px 12px;

  /* Border Radius */
  --radius-2xl: 16px;
  --radius-2xl-2: 20px;
  --radius-3xl: 30px;
  --radius-3xl-2: 40px;
  --radius-full: 1440px;

  /* Named Radii */
  --radius-nav: 1600px;
  --radius-body: 30px;
  --radius-cards: 20px;
  --radius-pills: 1600px;
  --radius-buttons: 1600px;
  --radius-wallet-icon: 16px;
  --radius-cards-elevated: 40px;

  /* Surfaces */
  --surface-sky-wash: #dceeff;
  --surface-paper-white: #ffffff;
  --surface-concrete-gray: #cccccc;
  --surface-sticker-surfaces: #e9ccff;

  /* Semantic */
  --text-primary: var(--color-carbon);
  --text-secondary: #555555;
  --text-on-dark: var(--color-paper-white);
  --border-subtle: #e3e3e3;
  --shadow-card: 0 1px 2px rgba(0,0,0,.04), 0 8px 24px rgba(0,0,0,.06);
  --shadow-pop: 0 12px 40px rgba(0,0,0,.12);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-aeonik-pro);
  font-size: var(--text-body-lg);
  line-height: var(--leading-body-lg);
  letter-spacing: var(--tracking-body-lg);
  color: var(--text-primary);
  background: var(--color-paper-white);
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; }
h1, h2, h3, h4 { font-family: var(--font-lateral); font-weight: var(--font-weight-extrabold); margin: 0; }
p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }

.container {
  width: min(100% - 40px, var(--page-max-width));
  margin-inline: auto;
}
.container--narrow { width: min(100% - 40px, 720px); }

/* ---------- Typography helpers ---------- */
.display {
  font-family: var(--font-lateral);
  font-size: clamp(48px, 9vw, var(--text-heading));
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  font-weight: var(--font-weight-extrabold);
}
.heading-sm {
  font-size: clamp(24px, 4vw, var(--text-heading-sm));
  line-height: var(--leading-heading-sm);
}
.subheading { font-size: var(--text-subheading); line-height: var(--leading-subheading); }
.caption {
  font-size: var(--text-caption);
  line-height: var(--leading-caption);
  letter-spacing: var(--tracking-caption);
}
.muted { color: var(--text-secondary); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-8);
  padding: 14px 28px;
  border-radius: var(--radius-buttons);
  border: 1.5px solid transparent;
  font-family: var(--font-lateral);
  font-weight: var(--font-weight-bold);
  font-size: var(--text-body-lg);
  text-decoration: none;
  cursor: pointer;
  transition: transform .15s ease, background .15s ease, color .15s ease, border-color .15s ease, box-shadow .15s ease;
  white-space: nowrap;
  user-select: none;
}
.btn:active { transform: scale(.97); }
.btn:focus-visible { outline: 3px solid var(--color-electric-blue); outline-offset: 2px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

.btn--primary { background: var(--color-carbon); color: var(--color-paper-white); }
.btn--primary:hover { background: #222; box-shadow: 0 8px 24px rgba(0,0,0,.18); }

.btn--blue { background: var(--color-electric-blue); color: var(--color-paper-white); }
.btn--blue:hover { background: #2f8ff5; box-shadow: 0 8px 24px rgba(77,162,255,.35); }

.btn--mint { background: var(--color-mint-pop); color: var(--color-carbon); }
.btn--mint:hover { background: #3fd08d; }

.btn--violet { background: var(--color-voltage-violet); color: var(--color-paper-white); }
.btn--violet:hover { background: #4a3ad0; }

.btn--ghost { background: transparent; color: var(--color-carbon); border-color: var(--color-carbon); }
.btn--ghost:hover { background: var(--color-carbon); color: var(--color-paper-white); }

.btn--soft { background: var(--color-soft-mist); color: var(--color-carbon); }
.btn--soft:hover { background: var(--color-concrete-gray); }

.btn--white { background: var(--color-paper-white); color: var(--color-carbon); }
.btn--white:hover { background: var(--color-sky-wash); }

.btn--sm { padding: 8px 16px; font-size: var(--text-caption); }
.btn--lg { padding: 18px 36px; font-size: 17px; }
.btn--block { width: 100%; }

/* ---------- Badges / chips ---------- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--radius-pills);
  background: var(--color-soft-mist);
  font-size: var(--text-caption);
  font-weight: var(--font-weight-bold);
  letter-spacing: .02em;
  text-transform: uppercase;
}
.chip--sky { background: var(--color-sky-wash); }
.chip--mint { background: var(--color-mint-pop); }
.chip--lavender { background: var(--color-lavender); }
.chip--sunburst { background: var(--color-sunburst); }
.chip--ember { background: var(--color-ember); color: var(--color-paper-white); }
.chip--dark { background: var(--color-carbon); color: var(--color-paper-white); }
.chip--outline { background: transparent; border: 1.5px solid var(--border-subtle); }

.badge-demo {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--radius-pills);
  background: var(--color-sunburst);
  color: var(--color-carbon);
  font-size: var(--text-caption);
  font-weight: var(--font-weight-extrabold);
  text-transform: uppercase;
  letter-spacing: .06em;
}

/* ---------- Cards ---------- */
.card {
  background: var(--surface-paper-white);
  border: 1.5px solid var(--border-subtle);
  border-radius: var(--radius-cards);
  padding: var(--card-padding);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.card--hover:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-pop);
  border-color: var(--color-carbon);
}
.card--sky { background: var(--surface-sky-wash); border-color: transparent; }
.card--dark { background: var(--color-carbon); color: var(--color-paper-white); border-color: transparent; }
.card--lavender { background: var(--surface-sticker-surfaces); border-color: transparent; }

/* ---------- Forms ---------- */
.field { display: flex; flex-direction: column; gap: var(--spacing-8); margin-bottom: var(--spacing-20); }
.field__label {
  font-family: var(--font-lateral);
  font-weight: var(--font-weight-bold);
  font-size: var(--text-caption);
  text-transform: uppercase;
  letter-spacing: .08em;
}
.input, .select, .textarea {
  width: 100%;
  padding: 14px 18px;
  border: 1.5px solid var(--border-subtle);
  border-radius: var(--radius-2xl);
  background: var(--color-paper-white);
  transition: border-color .15s ease, box-shadow .15s ease;
}
.input:focus, .select:focus, .textarea:focus {
  outline: none;
  border-color: var(--color-electric-blue);
  box-shadow: 0 0 0 4px rgba(77,162,255,.18);
}
.textarea { min-height: 110px; resize: vertical; }
.hint { font-size: var(--text-caption); color: var(--text-secondary); }

.form-errors {
  background: #fff1ec;
  border: 1.5px solid var(--color-ember);
  border-radius: var(--radius-2xl);
  padding: var(--spacing-16);
  margin-bottom: var(--spacing-20);
}
.form-errors li { color: #b03a00; font-size: var(--text-body-lg); }

/* ---------- Alerts / toasts ---------- */
.alert {
  padding: var(--spacing-16) var(--spacing-20);
  border-radius: var(--radius-2xl);
  margin-bottom: var(--spacing-20);
  font-weight: var(--font-weight-medium);
}
.alert--success { background: #e4fbf1; border: 1.5px solid var(--color-mint-pop); }
.alert--error { background: #fff1ec; border: 1.5px solid var(--color-ember); }
.alert--info { background: var(--color-sky-wash); border: 1.5px solid var(--color-electric-blue); }

#toast-root {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}
.toast {
  background: var(--color-carbon);
  color: var(--color-paper-white);
  padding: 14px 22px;
  border-radius: var(--radius-pills);
  font-weight: var(--font-weight-bold);
  font-size: var(--text-body-lg);
  box-shadow: var(--shadow-pop);
  animation: toast-in .25s ease;
  max-width: min(92vw, 480px);
  text-align: center;
}
.toast--success { background: var(--color-mint-pop); color: var(--color-carbon); }
.toast--error { background: var(--color-ember); color: var(--color-paper-white); }
@keyframes toast-in {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- Navigation ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,.86);
  backdrop-filter: blur(14px);
  border-bottom: 1.5px solid var(--border-subtle);
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-20);
  min-height: 72px;
}
.nav__brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-lateral);
  font-weight: var(--font-weight-extrabold);
  font-size: 19px;
  text-decoration: none;
  letter-spacing: -.02em;
}
.nav__brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: var(--color-carbon);
  color: var(--color-sunburst);
  display: grid;
  place-items: center;
}
.nav__links { display: flex; align-items: center; gap: var(--spacing-8); }
.nav__link {
  padding: 9px 16px;
  border-radius: var(--radius-pills);
  text-decoration: none;
  font-weight: var(--font-weight-bold);
  font-size: var(--text-body-lg);
  transition: background .15s ease;
}
.nav__link:hover { background: var(--color-soft-mist); }
.nav__link--active { background: var(--color-carbon); color: var(--color-paper-white); }
.nav__actions { display: flex; align-items: center; gap: var(--spacing-12); }
.nav__toggle {
  display: none;
  background: none;
  border: 1.5px solid var(--border-subtle);
  border-radius: 12px;
  padding: 8px;
  cursor: pointer;
}

@media (max-width: 860px) {
  .nav__toggle { display: inline-flex; }
  .nav__links, .nav__actions {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 72px;
    background: var(--color-paper-white);
    border-bottom: 1.5px solid var(--border-subtle);
    flex-direction: column;
    align-items: stretch;
    padding: var(--spacing-16);
    gap: var(--spacing-8);
  }
  .nav.is-open .nav__links,
  .nav.is-open .nav__actions { display: flex; }
  .nav.is-open .nav__actions { top: auto; position: static; border: 0; padding: 0 var(--spacing-16) var(--spacing-16); }
}

/* ---------- Hero / sections ---------- */
.hero {
  background: var(--color-carbon);
  color: var(--color-paper-white);
  padding: var(--spacing-128) 0 var(--spacing-80);
  position: relative;
  overflow: hidden;
}
.hero::after {
  content: "";
  position: absolute;
  width: 520px;
  height: 520px;
  right: -140px;
  top: -160px;
  background: radial-gradient(circle, rgba(77,162,255,.35), transparent 65%);
  pointer-events: none;
}
.hero__glow-mint {
  position: absolute;
  width: 380px;
  height: 380px;
  left: -120px;
  bottom: -180px;
  background: radial-gradient(circle, rgba(85,219,156,.28), transparent 65%);
  pointer-events: none;
}
.hero__content { position: relative; z-index: 1; max-width: 900px; }
.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,.1);
  border: 1px solid rgba(255,255,255,.18);
  color: var(--color-sunburst);
  padding: 8px 16px;
  border-radius: var(--radius-pills);
  font-size: var(--text-caption);
  font-weight: var(--font-weight-extrabold);
  text-transform: uppercase;
  letter-spacing: .1em;
  margin-bottom: var(--spacing-24);
}
.hero .display { color: var(--color-paper-white); }
.hero .display em { font-style: normal; color: var(--color-electric-blue); }
.hero__sub {
  margin-top: var(--spacing-24);
  font-size: clamp(16px, 2vw, 19px);
  line-height: 1.5;
  color: #c9c9c9;
  max-width: 640px;
}
.hero__cta { display: flex; flex-wrap: wrap; gap: var(--spacing-16); margin-top: var(--spacing-40); }
.hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-40);
  margin-top: var(--spacing-60);
  padding-top: var(--spacing-32);
  border-top: 1px solid rgba(255,255,255,.14);
}
.hero__stat-value {
  font-family: var(--font-lateral);
  font-size: 34px;
  font-weight: var(--font-weight-extrabold);
  color: var(--color-mint-pop);
}
.hero__stat-label { color: #9a9a9a; font-size: var(--text-caption); text-transform: uppercase; letter-spacing: .08em; }

.section { padding: var(--spacing-80) 0; }
.section--mist { background: var(--color-soft-mist); }
.section--sky { background: var(--color-sky-wash); }
.section__head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: var(--spacing-20);
  margin-bottom: var(--spacing-40);
  flex-wrap: wrap;
}
.section__title { font-size: clamp(28px, 4vw, var(--text-heading-sm)); line-height: var(--leading-heading-sm); }

/* ---------- Grids ---------- */
.grid { display: grid; gap: var(--spacing-24); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 1024px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .grid--4, .grid--3, .grid--2 { grid-template-columns: 1fr; }
  .hero { padding: var(--spacing-80) 0 var(--spacing-60); }
  .section { padding: var(--spacing-60) 0; }
}

/* ---------- Challenge card ---------- */
.challenge-card { display: flex; flex-direction: column; gap: var(--spacing-16); height: 100%; text-decoration: none; }
.challenge-card__top { display: flex; justify-content: space-between; align-items: start; gap: 12px; }
.challenge-card__title {
  font-family: var(--font-lateral);
  font-size: 19px;
  font-weight: var(--font-weight-extrabold);
  line-height: 1.25;
}
.challenge-card__desc {
  color: var(--text-secondary);
  font-size: var(--text-body-lg);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.challenge-card__meta {
  margin-top: auto;
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-12);
  padding-top: var(--spacing-16);
  border-top: 1.5px dashed var(--border-subtle);
  font-size: var(--text-caption);
  color: var(--text-secondary);
  font-weight: var(--font-weight-bold);
}
.challenge-card__meta span { display: inline-flex; align-items: center; gap: 5px; }

/* ---------- Steps (viral loop) ---------- */
.step { display: flex; flex-direction: column; gap: var(--spacing-12); }
.step__num {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-wallet-icon);
  background: var(--color-carbon);
  color: var(--color-sunburst);
  display: grid;
  place-items: center;
  font-family: var(--font-lateral);
  font-weight: var(--font-weight-extrabold);
}
.step__title { font-family: var(--font-lateral); font-weight: var(--font-weight-extrabold); font-size: 17px; }
.step__text { color: var(--text-secondary); }

/* ---------- Stats ---------- */
.stat { display: flex; flex-direction: column; gap: 6px; }
.stat__value {
  font-family: var(--font-lateral);
  font-size: clamp(32px, 5vw, 44px);
  font-weight: var(--font-weight-extrabold);
  line-height: 1;
}
.stat__label {
  font-size: var(--text-caption);
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--text-secondary);
  font-weight: var(--font-weight-bold);
}
.stat--accent .stat__value { color: var(--color-voltage-violet); }

/* ---------- Tables ---------- */
.table-wrap { overflow-x: auto; border: 1.5px solid var(--border-subtle); border-radius: var(--radius-cards); }
.table { width: 100%; border-collapse: collapse; background: var(--color-paper-white); }
.table th, .table td { padding: 14px 18px; text-align: left; border-bottom: 1px solid var(--border-subtle); }
.table th {
  font-size: var(--text-caption);
  text-transform: uppercase;
  letter-spacing: .08em;
  background: var(--color-soft-mist);
  font-weight: var(--font-weight-extrabold);
}
.table tr:last-child td { border-bottom: 0; }
.table tr.is-me { background: var(--color-sky-wash); }
.rank-pill {
  display: inline-grid;
  place-items: center;
  min-width: 32px;
  height: 32px;
  padding: 0 8px;
  border-radius: var(--radius-pills);
  background: var(--color-carbon);
  color: var(--color-paper-white);
  font-weight: var(--font-weight-extrabold);
  font-size: var(--text-caption);
}
.rank-pill--1 { background: var(--color-sunburst); color: var(--color-carbon); }
.rank-pill--2 { background: var(--color-concrete-gray); color: var(--color-carbon); }
.rank-pill--3 { background: var(--color-ember); color: var(--color-paper-white); }

/* ---------- Auth layout ---------- */
.auth-page {
  min-height: calc(100vh - 72px);
  display: grid;
  place-items: center;
  padding: var(--spacing-60) 20px;
  background:
    radial-gradient(circle at 15% 20%, rgba(233,204,255,.55), transparent 40%),
    radial-gradient(circle at 85% 80%, rgba(220,238,255,.8), transparent 45%),
    var(--color-paper-white);
}
.auth-card {
  width: min(100%, 460px);
  background: var(--color-paper-white);
  border: 1.5px solid var(--border-subtle);
  border-radius: var(--radius-body);
  padding: var(--spacing-40);
  box-shadow: var(--shadow-pop);
}
.auth-card__brand { display: flex; justify-content: center; margin-bottom: var(--spacing-24); }
.auth-card__title { text-align: center; font-size: 26px; margin-bottom: var(--spacing-8); }
.auth-card__sub { text-align: center; color: var(--text-secondary); margin-bottom: var(--spacing-28); }
.auth-card__footer { text-align: center; margin-top: var(--spacing-24); font-size: var(--text-body-lg); }
.auth-card__footer a { color: var(--color-voltage-violet); font-weight: var(--font-weight-bold); }

/* ---------- Play (quiz) ---------- */
.play-shell { min-height: 100vh; background: var(--color-carbon); color: var(--color-paper-white); }
.play-top {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(0,0,0,.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255,255,255,.12);
  padding: var(--spacing-16) 0;
}
.play-top__inner { display: flex; align-items: center; justify-content: space-between; gap: var(--spacing-16); }
.play-top__title {
  font-family: var(--font-lateral);
  font-weight: var(--font-weight-extrabold);
  font-size: 16px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 50vw;
}
.play-timer {
  background: var(--color-sunburst);
  color: var(--color-carbon);
  font-family: var(--font-lateral);
  font-weight: var(--font-weight-extrabold);
  padding: 8px 18px;
  border-radius: var(--radius-pills);
  font-variant-numeric: tabular-nums;
}
.play-progress {
  height: 6px;
  background: rgba(255,255,255,.12);
  border-radius: var(--radius-pills);
  overflow: hidden;
  margin-top: var(--spacing-12);
}
.play-progress__bar {
  height: 100%;
  background: linear-gradient(90deg, var(--color-electric-blue), var(--color-mint-pop));
  width: 0%;
  transition: width .3s ease;
}
.play-body { padding: var(--spacing-60) 0 var(--spacing-80); }
.play-card {
  background: var(--color-paper-white);
  color: var(--color-carbon);
  border-radius: var(--radius-body);
  padding: clamp(24px, 5vw, 48px);
  max-width: 760px;
  margin-inline: auto;
}
.play-question {
  font-family: var(--font-lateral);
  font-size: clamp(20px, 3vw, 28px);
  font-weight: var(--font-weight-extrabold);
  line-height: 1.3;
  margin-bottom: var(--spacing-28);
}
.option-list { display: flex; flex-direction: column; gap: var(--spacing-12); }
.option {
  display: flex;
  align-items: center;
  gap: var(--spacing-16);
  padding: 16px 20px;
  border: 2px solid var(--border-subtle);
  border-radius: var(--radius-2xl);
  cursor: pointer;
  transition: border-color .12s ease, background .12s ease, transform .12s ease;
  font-weight: var(--font-weight-medium);
}
.option:hover { border-color: var(--color-electric-blue); background: var(--color-sky-wash); transform: translateX(4px); }
.option input { accent-color: var(--color-electric-blue); width: 18px; height: 18px; }
.option.is-selected { border-color: var(--color-electric-blue); background: var(--color-sky-wash); }
.play-nav { display: flex; justify-content: space-between; gap: var(--spacing-16); margin-top: var(--spacing-32); }
.q-dots { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: var(--spacing-24); }
.q-dot {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  border: 1.5px solid var(--border-subtle);
  background: var(--color-paper-white);
  font-size: var(--text-caption);
  font-weight: var(--font-weight-extrabold);
  cursor: pointer;
}
.q-dot.is-answered { background: var(--color-mint-pop); border-color: var(--color-mint-pop); }
.q-dot.is-current { border-color: var(--color-carbon); background: var(--color-carbon); color: var(--color-paper-white); }

/* ---------- Result ---------- */
.result-hero {
  background: var(--color-carbon);
  color: var(--color-paper-white);
  padding: var(--spacing-80) 0;
  text-align: center;
}
.score-ring {
  width: 190px;
  height: 190px;
  border-radius: 50%;
  margin: var(--spacing-24) auto;
  display: grid;
  place-items: center;
  background:
    radial-gradient(closest-side, var(--color-carbon) 78%, transparent 79% 100%),
    conic-gradient(var(--color-mint-pop) calc(var(--score-pct) * 1%), rgba(255,255,255,.14) 0);
}
.score-ring__value { font-family: var(--font-lateral); font-size: 44px; font-weight: var(--font-weight-extrabold); }
.score-ring__label { font-size: var(--text-caption); color: #9a9a9a; text-transform: uppercase; letter-spacing: .1em; }
.share-row { display: flex; flex-wrap: wrap; gap: var(--spacing-12); justify-content: center; margin-top: var(--spacing-24); }

.review-item { border-bottom: 1.5px solid var(--border-subtle); padding: var(--spacing-20) 0; }
.review-item:last-child { border-bottom: 0; }
.review-item__q { font-family: var(--font-lateral); font-weight: var(--font-weight-bold); margin-bottom: var(--spacing-12); }
.review-opt {
  display: flex;
  gap: 10px;
  align-items: start;
  padding: 10px 14px;
  border-radius: var(--radius-2xl);
  margin-bottom: 8px;
  font-size: var(--text-body-lg);
}
.review-opt--correct { background: #e4fbf1; border: 1.5px solid var(--color-mint-pop); font-weight: var(--font-weight-bold); }
.review-opt--wrong { background: #fff1ec; border: 1.5px solid var(--color-ember); }
.review-opt--muted { background: var(--color-soft-mist); }
.review-expl { font-size: var(--text-caption); color: var(--text-secondary); margin-top: 8px; }

/* ---------- Generator ---------- */
.gen-layout { display: grid; grid-template-columns: 380px 1fr; gap: var(--spacing-32); align-items: start; }
@media (max-width: 960px) { .gen-layout { grid-template-columns: 1fr; } }
.gen-preview { min-height: 320px; }
.preview-q { border: 1.5px solid var(--border-subtle); border-radius: var(--radius-2xl); padding: var(--spacing-20); margin-bottom: var(--spacing-16); }
.preview-q__text { font-family: var(--font-lateral); font-weight: var(--font-weight-bold); margin-bottom: var(--spacing-12); }
.preview-opt { padding: 8px 14px; border-radius: var(--radius-2xl); margin-bottom: 6px; font-size: var(--text-body-lg); background: var(--color-soft-mist); }
.preview-opt.is-correct { background: var(--color-mint-pop); font-weight: var(--font-weight-bold); }
.spinner {
  width: 22px;
  height: 22px;
  border: 3px solid rgba(255,255,255,.3);
  border-top-color: currentColor;
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
.spinner--dark { border-color: rgba(0,0,0,.15); border-top-color: var(--color-carbon); }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Filters bar ---------- */
.filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-12);
  align-items: center;
  margin-bottom: var(--spacing-32);
}
.filters .input, .filters .select { width: auto; min-width: 180px; }

/* ---------- Footer ---------- */
.footer {
  background: var(--color-carbon);
  color: #9a9a9a;
  padding: var(--spacing-60) 0 var(--spacing-40);
  margin-top: auto;
}
.footer__grid { display: flex; flex-wrap: wrap; justify-content: space-between; gap: var(--spacing-32); }
.footer__brand { color: var(--color-paper-white); font-family: var(--font-lateral); font-weight: var(--font-weight-extrabold); font-size: 19px; }
.footer a { color: #c9c9c9; text-decoration: none; }
.footer a:hover { color: var(--color-electric-blue); }
.footer__links { display: flex; flex-wrap: wrap; gap: var(--spacing-20); }
.footer__bottom {
  margin-top: var(--spacing-40);
  padding-top: var(--spacing-20);
  border-top: 1px solid rgba(255,255,255,.12);
  font-size: var(--text-caption);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- Page shell ---------- */
.page { min-height: calc(100vh - 72px); display: flex; flex-direction: column; }
.page__main { flex: 1; }
.page-head { padding: var(--spacing-60) 0 var(--spacing-32); }
.page-head--mist { background: var(--color-sky-wash); }
.page-head__title { font-size: clamp(30px, 5vw, var(--text-heading-sm)); line-height: var(--leading-heading-sm); }
.page-head__sub { margin-top: var(--spacing-12); color: var(--text-secondary); max-width: 640px; }

/* ---------- Empty state ---------- */
.empty {
  text-align: center;
  padding: var(--spacing-60) var(--spacing-24);
  border: 2px dashed var(--border-subtle);
  border-radius: var(--radius-body);
  background: var(--color-soft-mist);
}
.empty__title { font-family: var(--font-lateral); font-size: 21px; font-weight: var(--font-weight-extrabold); margin-bottom: var(--spacing-8); }

/* ---------- Achievements ---------- */
.badge-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: var(--spacing-16); }
.badge {
  text-align: center;
  padding: var(--spacing-20) var(--spacing-12);
  border-radius: var(--radius-cards);
  border: 1.5px solid var(--border-subtle);
  background: var(--color-paper-white);
}
.badge.is-locked { opacity: .45; filter: grayscale(1); }
.badge__icon { width: 40px; height: 40px; margin: 0 auto var(--spacing-8); color: var(--color-voltage-violet); }
.badge__name { font-family: var(--font-lateral); font-weight: var(--font-weight-bold); font-size: 13px; }
.badge__xp { font-size: var(--text-caption); color: var(--text-secondary); }

/* ---------- Activity feed ---------- */
.feed { display: flex; flex-direction: column; gap: var(--spacing-12); }
.feed__item {
  display: flex;
  align-items: center;
  gap: var(--spacing-16);
  padding: var(--spacing-16);
  border-radius: var(--radius-2xl);
  background: var(--color-paper-white);
  border: 1.5px solid var(--border-subtle);
}
.feed__dot { width: 10px; height: 10px; border-radius: 50%; background: var(--color-electric-blue); flex-shrink: 0; }
.feed__dot--mint { background: var(--color-mint-pop); }
.feed__text { flex: 1; font-size: var(--text-body-lg); }
.feed__time { font-size: var(--text-caption); color: var(--text-secondary); }

/* ---------- Share buttons ---------- */
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: var(--radius-buttons);
  border: 1.5px solid rgba(255,255,255,.25);
  background: rgba(255,255,255,.08);
  color: var(--color-paper-white);
  font-weight: var(--font-weight-bold);
  font-size: var(--text-caption);
  text-transform: uppercase;
  letter-spacing: .05em;
  cursor: pointer;
  text-decoration: none;
  transition: background .15s ease, transform .15s ease;
}
.share-btn:hover { background: rgba(255,255,255,.18); transform: translateY(-2px); }
.share-btn--light { border-color: var(--border-subtle); background: var(--color-paper-white); color: var(--color-carbon); }
.share-btn--light:hover { background: var(--color-sky-wash); }
.share-btn--wa:hover { background: #25d366; color: #fff; border-color: #25d366; }
.share-btn--fb:hover { background: #1877f2; color: #fff; border-color: #1877f2; }
.share-btn--x:hover { background: #000; color: #fff; border-color: #000; }

/* ---------- Utility ---------- */
.flex { display: flex; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-8 { gap: var(--spacing-8); }
.gap-12 { gap: var(--spacing-12); }
.gap-16 { gap: var(--spacing-16); }
.gap-24 { gap: var(--spacing-24); }
.mt-8 { margin-top: var(--spacing-8); }
.mt-16 { margin-top: var(--spacing-16); }
.mt-24 { margin-top: var(--spacing-24); }
.mt-32 { margin-top: var(--spacing-32); }
.mb-16 { margin-bottom: var(--spacing-16); }
.mb-24 { margin-bottom: var(--spacing-24); }
.mb-32 { margin-bottom: var(--spacing-32); }
.text-center { text-align: center; }
.w-full { width: 100%; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.hidden { display: none !important; }