/* ===========================================================
   Code Olympiad 2081 - Round question viewer
   Shared shell for the core and written practice rounds:
   progress, timer, question card, and navigation in the
   Night Shift world. Token-driven only.
   =========================================================== */

/* ---------- Particles backdrop ---------- */
#particles-js {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}

/* ---------- Quiz main ---------- */
.quiz-main {
  position: relative;
  padding: clamp(var(--space-3xl), 6vw, var(--space-5xl)) var(--space-lg) var(--space-4xl);
}

.quiz {
  position: relative;
  width: min(860px, 100%);
  margin-inline: auto;
}

/* ---------- Header ---------- */
.quiz__header {
  text-align: center;
}

.quiz__chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-tertiary);
  padding: var(--space-2xs) var(--space-md);
  border: 1px solid var(--color-border-hairline);
  border-radius: var(--radius-full);
  background: var(--color-surface);
}

.quiz__chip i {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  background: var(--color-phosphor);
  box-shadow: 0 0 10px color-mix(in srgb, var(--color-phosphor) 60%, transparent);
}

.quiz__header h1 {
  margin-top: var(--space-md);
  font-family: var(--font-display);
  font-size: var(--text-heading);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
}

.quiz__meta {
  margin-top: var(--space-2xs);
  font-family: var(--font-mono);
  font-size: var(--text-kicker);
  color: var(--color-text-tertiary);
}

.quiz__meta b {
  color: var(--color-phosphor);
  font-weight: 600;
}

/* ---------- Progress ---------- */
.quiz__progress {
  margin-top: var(--space-xl);
  height: 8px;
  border-radius: var(--radius-full);
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border-hairline);
  overflow: hidden;
}

#progress-bar {
  height: 100%;
  width: 0;
  border-radius: var(--radius-full);
  background: linear-gradient(90deg, var(--color-accent-strong), var(--color-phosphor));
  transition: width var(--motion-base) var(--ease-touch);
}

/* ---------- Question card ---------- */
.quiz__card {
  margin-top: var(--space-xl);
  padding: clamp(var(--space-lg), 4vw, var(--space-2xl));
  background: var(--color-surface);
  border: 1px solid var(--color-border-hairline);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.quiz__card h2 {
  font-family: var(--font-display);
  font-size: var(--text-title);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-text-primary);
}

.quiz__card > p {
  margin-top: var(--space-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.quiz__card .q8 {
  display: none;
  width: 80%;
  height: auto;
  margin: var(--space-lg) auto 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-hairline);
}

/* ---------- Examples & constraints ---------- */
.mono-panel {
  margin-top: var(--space-lg);
  padding: var(--space-md) var(--space-lg);
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border-hairline);
  border-left: 3px solid var(--color-phosphor);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.mono-panel h3 {
  font-family: var(--font-mono);
  font-size: var(--text-kicker);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-phosphor);
}

.mono-panel ul {
  list-style: none;
  margin-top: var(--space-sm);
  display: grid;
  gap: var(--space-sm);
}

.mono-panel li {
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.mono-panel code {
  color: var(--color-phosphor);
  font-family: inherit;
}

/* ---------- Timer & controls ---------- */
.quiz__timer {
  font-family: var(--font-mono);
  font-size: var(--text-title);
  font-weight: 600;
  color: var(--color-phosphor);
  text-shadow: 0 0 16px color-mix(in srgb, var(--color-phosphor) 35%, transparent);
}

.quiz__nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  flex-wrap: wrap;
  margin-top: var(--space-xl);
}

.quiz__controls {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
}

.quiz__controls button {
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-secondary);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border-hairline);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: color var(--motion-base) var(--ease-touch),
    border-color var(--motion-base) var(--ease-touch),
    box-shadow var(--motion-base) var(--ease-touch);
}

@media (hover: hover) {
  .quiz__controls button:hover:not(:disabled) {
    color: var(--color-phosphor);
    border-color: color-mix(in srgb, var(--color-phosphor) 45%, transparent);
    box-shadow: 0 0 14px color-mix(in srgb, var(--color-phosphor) 18%, transparent);
  }
}

.quiz__controls button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.nav-btn {
  font-family: var(--font-mono);
  font-size: var(--text-kicker);
  color: var(--color-text-primary);
  padding: var(--space-sm) var(--space-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: color var(--motion-base) var(--ease-touch),
    border-color var(--motion-base) var(--ease-touch);
}

@media (hover: hover) {
  .nav-btn:hover:not(:disabled) {
    color: var(--color-phosphor);
    border-color: color-mix(in srgb, var(--color-phosphor) 55%, transparent);
  }
}

.nav-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ---------- Fade in jump (preserves original behavior) ---------- */
.fade-in-jump {
  opacity: 0;
  transform: translateY(-30px);
  animation: fadeInJump 2s forwards, quiz-fade var(--motion-base) var(--ease-touch);
}

@keyframes fadeInJump {
  0% {
    opacity: 0;
    transform: translateY(-30px);
  }
  50% {
    opacity: 0.5;
    transform: translateY(10px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes quiz-fade {
  from { opacity: 0; }
  to { opacity: 1; }
}

@media (max-width: 620px) {
  .quiz__nav {
    justify-content: center;
  }

  .quiz__card .q8 {
    width: 100%;
  }
}