/* ============================================================
   Prompt Engineering Gauntlet — Shared Styles
   cloudcognoscente.com/gauntlet
   ============================================================ */

/* ── CSS Variables ─────────────────────────────────────────── */
:root {
  --color-bg:          #0f1117;
  --color-surface:     #1a1d2e;
  --color-surface-2:   #242740;
  --color-border:      #2e3250;
  --color-primary:     #6c63ff;
  --color-primary-hover: #5a52e0;
  --color-accent:      #00d4aa;
  --color-warn:        #ff9f43;
  --color-danger:      #ff6b6b;
  --color-text:        #e8eaf6;
  --color-text-muted:  #8b92b5;
  --color-gold:        #ffd700;
  --color-silver:      #c0c0c0;
  --color-bronze:      #cd7f32;

  /* Challenge badge colours */
  --c1: #22c55e;   /* green  — Zero-Shot */
  --c2: #eab308;   /* yellow — Few-Shot */
  --c3: #f97316;   /* orange — CoT */
  --c4: #ef4444;   /* red    — Self-Consistency */
  --c5: #a855f7;   /* purple — ToT */

  --radius:    12px;
  --radius-sm: 8px;
  --shadow:    0 4px 24px rgba(0,0,0,0.4);
  --transition: 0.2s ease;
}

/* ── Reset & Base ───────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
}

a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-primary-hover); }

img { max-width: 100%; display: block; }

/* ── Layout ─────────────────────────────────────────────────── */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.container--narrow {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ── Navigation ─────────────────────────────────────────────── */
.nav {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.nav__logo {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav__logo span { color: var(--color-primary); }

.nav__links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.nav__links a {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 500;
}

.nav__links a:hover { color: var(--color-text); }

/* ── Hero ───────────────────────────────────────────────────── */
.hero {
  text-align: center;
  padding: 4rem 1.5rem 2rem;
  background: radial-gradient(ellipse at top, #1a1d2e 0%, var(--color-bg) 70%);
}

.hero__eyebrow {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
}

.hero__title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, #fff 40%, var(--color-primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  max-width: 560px;
  margin: 0 auto 2rem;
}

/* ── Countdown Timer ─────────────────────────────────────────── */
.countdown {
  display: inline-flex;
  gap: 1.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1rem 2rem;
  margin-bottom: 3rem;
}

.countdown__unit {
  text-align: center;
}

.countdown__value {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
  min-width: 2.5ch;
}

.countdown__label {
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.countdown__sep {
  align-self: center;
  font-size: 1.5rem;
  color: var(--color-border);
  margin-bottom: 1rem;
}

.countdown__live {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-primary);
  padding: 0.4rem 0.5rem;
}

/* ── Stats Bar ───────────────────────────────────────────────── */
.stats-bar {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.stat-pill {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 0.4rem 1rem;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.stat-pill strong { color: var(--color-text); }

/* ── Section Headings ───────────────────────────────────────── */
.section-title {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.section-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

/* ── Challenge Cards Grid ───────────────────────────────────── */
.challenges-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.25rem;
  margin-bottom: 4rem;
}

.challenge-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.challenge-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 4px; height: 100%;
}

.challenge-card[data-challenge="1"]::before { background: var(--c1); }
.challenge-card[data-challenge="2"]::before { background: var(--c2); }
.challenge-card[data-challenge="3"]::before { background: var(--c3); }
.challenge-card[data-challenge="4"]::before { background: var(--c4); }
.challenge-card[data-challenge="5"]::before { background: var(--c5); }

.challenge-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
  border-color: var(--color-primary);
}

.challenge-card.locked {
  opacity: 0.45;
  pointer-events: none;
}

.challenge-card__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.75rem;
}

.challenge-card__number {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.badge {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.badge--open    { background: rgba(34,197,94,0.15);  color: #22c55e; }
.badge--locked  { background: rgba(139,146,181,0.15); color: var(--color-text-muted); }
.badge--done    { background: rgba(108,99,255,0.15);  color: var(--color-primary); }

.challenge-card__title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.challenge-card__technique {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
}

.challenge-card__meta {
  display: flex;
  gap: 1rem;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.challenge-card__meta span { display: flex; align-items: center; gap: 0.3rem; }

/* ── Leaderboard ─────────────────────────────────────────────── */
.leaderboard {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 4rem;
}

.leaderboard__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

.leaderboard__title {
  font-weight: 700;
  font-size: 1rem;
}

.leaderboard__refresh {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.leaderboard__refresh .dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.3; }
}

.leaderboard__table-wrap { overflow-x: auto; }

.leaderboard__table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.leaderboard__table th {
  background: var(--color-surface-2);
  color: var(--color-text-muted);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  padding: 0.6rem 1rem;
  text-align: left;
  white-space: nowrap;
}

.leaderboard__table td {
  padding: 0.8rem 1rem;
  border-top: 1px solid var(--color-border);
  vertical-align: middle;
}

.leaderboard__table tr:hover td { background: var(--color-surface-2); }

.rank { font-weight: 700; font-size: 1rem; }
.rank--1 { color: var(--color-gold); }
.rank--2 { color: var(--color-silver); }
.rank--3 { color: var(--color-bronze); }

.learner-name { font-weight: 600; }

.challenge-dot {
  display: inline-block;
  width: 10px; height: 10px;
  border-radius: 50%;
  margin: 0 2px;
}

.challenge-dot--done    { background: var(--color-accent); }
.challenge-dot--pending { background: var(--color-border); }

.score-total {
  font-weight: 800;
  font-size: 1rem;
  color: var(--color-primary);
}

.leaderboard__empty {
  text-align: center;
  padding: 3rem;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

/* ── Challenge Page Layout ───────────────────────────────────── */
.challenge-page {
  padding: 3rem 0 5rem;
}

.challenge-header {
  margin-bottom: 2.5rem;
}

.challenge-header__back {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 1.5rem;
  transition: color var(--transition);
}

.challenge-header__back:hover { color: var(--color-text); }

.challenge-header__eyebrow {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.challenge-header__title {
  font-size: clamp(1.6rem, 4vw, 2.5rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 0.75rem;
}

.challenge-header__meta {
  display: flex;
  gap: 1.5rem;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  flex-wrap: wrap;
}

/* ── Content Cards ───────────────────────────────────────────── */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.card__title {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.card__title::before {
  content: '';
  width: 3px; height: 14px;
  border-radius: 2px;
  background: var(--color-primary);
}

/* ── Scenario block ─────────────────────────────────────────── */
.scenario {
  background: var(--color-surface-2);
  border-left: 3px solid var(--color-accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 1rem 1.25rem;
  font-style: italic;
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
}

/* ── Rules List ─────────────────────────────────────────────── */
.rules-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.rules-list li {
  display: flex;
  gap: 0.75rem;
  font-size: 0.92rem;
}

.rules-list li::before {
  content: '→';
  color: var(--color-primary);
  font-weight: 700;
  flex-shrink: 0;
}

/* ── Code / Test blocks ──────────────────────────────────────── */
.test-block {
  background: #0d1117;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 1rem 1.25rem;
  font-family: 'Fira Code', 'Courier New', monospace;
  font-size: 0.83rem;
  color: #c9d1d9;
  margin-bottom: 1rem;
  white-space: pre-wrap;
  word-break: break-word;
}

.test-block__label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
  font-family: inherit;
}

/* ── Scoring Table ───────────────────────────────────────────── */
.scoring-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.scoring-table th {
  background: var(--color-surface-2);
  color: var(--color-text-muted);
  font-size: 0.75rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  padding: 0.5rem 0.75rem;
  text-align: left;
}

.scoring-table td {
  padding: 0.65rem 0.75rem;
  border-top: 1px solid var(--color-border);
}

.scoring-table tr:last-child td {
  border-top: 2px solid var(--color-primary);
  font-weight: 700;
  color: var(--color-primary);
}

.pts { font-weight: 700; color: var(--color-accent); text-align: right; }

/* ── Submission Form ─────────────────────────────────────────── */
.form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text);
}

.form-group .hint {
  font-size: 0.78rem;
  color: var(--color-text-muted);
}

.form-control {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: 0.9rem;
  padding: 0.65rem 0.9rem;
  transition: border-color var(--transition), box-shadow var(--transition);
  width: 100%;
  font-family: inherit;
}

.form-control:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(108,99,255,0.2);
}

.form-control::placeholder { color: var(--color-text-muted); }

textarea.form-control { resize: vertical; min-height: 80px; }

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.form-divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 0.5rem 0;
}

.form-section-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: -0.25rem;
}

/* ── Buttons ─────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  font-family: inherit;
}

.btn--primary {
  background: var(--color-primary);
  color: #fff;
}

.btn--primary:hover { background: var(--color-primary-hover); transform: translateY(-1px); }
.btn--primary:active { transform: none; }

.btn--outline {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn--outline:hover { border-color: var(--color-primary); color: var(--color-primary); }

.btn--full { width: 100%; }

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none !important;
}

/* ── Alert / Toast ───────────────────────────────────────────── */
.alert {
  padding: 0.9rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.alert--success {
  background: rgba(34,197,94,0.1);
  border: 1px solid rgba(34,197,94,0.3);
  color: #4ade80;
}

.alert--error {
  background: rgba(255,107,107,0.1);
  border: 1px solid rgba(255,107,107,0.3);
  color: #ff6b6b;
}

.alert--info {
  background: rgba(108,99,255,0.1);
  border: 1px solid rgba(108,99,255,0.3);
  color: var(--color-primary);
}

/* ── Bonus callout ───────────────────────────────────────────── */
.bonus-callout {
  background: rgba(255,159,67,0.1);
  border: 1px solid rgba(255,159,67,0.3);
  border-radius: var(--radius-sm);
  padding: 1rem 1.25rem;
  font-size: 0.875rem;
  color: var(--color-warn);
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
}

/* ── Progress bar (challenge steps) ────────────────────────── */
.progress-steps {
  display: flex;
  gap: 0;
  margin-bottom: 2.5rem;
  overflow-x: auto;
}

.progress-step {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  min-width: 80px;
}

.progress-step::before {
  content: '';
  position: absolute;
  top: 16px;
  left: 50%;
  width: 100%;
  height: 2px;
  background: var(--color-border);
  z-index: 0;
}

.progress-step:last-child::before { display: none; }

.progress-step__dot {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--color-surface-2);
  border: 2px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  position: relative;
  z-index: 1;
}

.progress-step--active .progress-step__dot {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

.progress-step--done .progress-step__dot {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #000;
}

.progress-step__label {
  font-size: 0.65rem;
  color: var(--color-text-muted);
  margin-top: 0.4rem;
  text-align: center;
  letter-spacing: 0.05em;
}

/* ── Confetti canvas (overlaid on page) ─────────────────────── */
#confetti-canvas {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
}

/* ── Footer ─────────────────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--color-border);
  padding: 2rem 0;
  text-align: center;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.footer a { color: var(--color-primary); }

/* ── Responsive ─────────────────────────────────────────────── */
@media (max-width: 640px) {
  .form-row { grid-template-columns: 1fr; }
  .challenges-grid { grid-template-columns: 1fr; }
  .countdown { gap: 1rem; padding: 0.75rem 1.25rem; }
  .countdown__value { font-size: 1.5rem; }
  .nav__links { display: none; }
}