/* ============================================================
   Farm Fresh STEM Treasure Hunt — Main Stylesheet
   Mobile-first, Farm Fresh inspired palette
   ============================================================ */

/* ── Google Font fallback ─────────────────────────────────── */
:root {
  --ff-font: 'Nunito', system-ui, sans-serif;

  /* Brand Palette */
  --green-dark:    #1a5c2a;
  --green-mid:     #2d9a4e;
  --green-light:   #5cbf6a;
  --green-pale:    #d4edda;
  --yellow-warm:   #f5c518;
  --yellow-pale:   #fff3cd;
  --orange-accent: #e8821a;
  --cream:         #fdfaf4;
  --text-dark:     #1e2d20;
  --text-muted:    #6c757d;

  /* STEM Category Colours */
  --science-bg:      #e8f4fd;
  --science-fg:      #0d6efd;
  --math-bg:         #fff0e6;
  --math-fg:         #e8821a;
  --engineering-bg:  #f5e6ff;
  --engineering-fg:  #7c3aed;
  --technology-bg:   #e6f7ee;
  --technology-fg:   #198754;
  --integration-bg:  #fff8e1;
  --integration-fg:  #d97706;

  /* Transitions */
  --transition-fast: 0.18s ease;
  --transition-med:  0.3s ease;

  /* Rounded */
  --radius-lg: 1.25rem;
  --radius-xl: 1.75rem;
}

/* ── Base ─────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--ff-font);
  background: var(--cream);
  color: var(--text-dark);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Navbar ───────────────────────────────────────────────── */
.bg-success-gradient {
  background: linear-gradient(135deg, var(--green-dark) 0%, var(--green-mid) 100%) !important;
  box-shadow: 0 2px 16px rgba(26,92,42,.25);
}

.nav-logo { font-size: 1.4rem; }
.nav-title { font-size: 1rem; font-weight: 800; letter-spacing: -.3px; }

/* ── Hero Section ─────────────────────────────────────────── */
.hero-section {
  background: linear-gradient(160deg, var(--green-dark) 0%, var(--green-mid) 60%, #48bb78 100%);
  color: #fff;
  padding: 3.5rem 1rem 3rem;
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Ccircle cx='30' cy='30' r='20'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E") repeat;
  pointer-events: none;
}

.hero-emoji {
  font-size: 3rem;
  animation: floatBounce 3s ease-in-out infinite;
}

@keyframes floatBounce {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-8px); }
}

.hero-title {
  font-size: clamp(1.8rem, 6vw, 3rem);
  font-weight: 900;
  text-shadow: 0 2px 12px rgba(0,0,0,.2);
  line-height: 1.1;
}

.hero-subtitle {
  font-size: 1.15rem;
  opacity: .9;
  font-weight: 600;
}

/* ── Buttons ──────────────────────────────────────────────── */
.btn {
  font-family: var(--ff-font);
  font-weight: 700;
  transition: all var(--transition-fast);
}

.btn-xl {
  padding: .85rem 2rem;
  font-size: 1.1rem;
}

.btn-success {
  background: var(--green-mid) !important;
  border-color: var(--green-mid) !important;
}

.btn-success:hover {
  background: var(--green-dark) !important;
  border-color: var(--green-dark) !important;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(45,154,78,.35);
}

.btn-outline-success { color: var(--green-mid) !important; border-color: var(--green-mid) !important; }
.btn-outline-success:hover { background: var(--green-mid) !important; color: #fff !important; }

.animate-pulse {
  animation: pulse 2s cubic-bezier(.4,0,.6,1) infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: .92; transform: scale(1.03); }
}

/* ── Cards ────────────────────────────────────────────────── */
.card {
  transition: box-shadow var(--transition-med), transform var(--transition-med);
}

/* ── Step Cards (How It Works) ────────────────────────────── */
.step-card {
  background: #fff;
  border-radius: var(--radius-lg);
  box-shadow: 0 2px 12px rgba(0,0,0,.06);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.step-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0,0,0,.1);
}

.step-icon { font-size: 2rem; }

/* ── STEM Category Badges ─────────────────────────────────── */
.category-badge {
  transition: transform var(--transition-fast);
  cursor: default;
}
.category-badge:hover { transform: scale(1.05); }

.stem-science      { background: var(--science-bg);     color: var(--science-fg); }
.stem-mathematics  { background: var(--math-bg);        color: var(--math-fg); }
.stem-engineering  { background: var(--engineering-bg); color: var(--engineering-fg); }
.stem-technology   { background: var(--technology-bg);  color: var(--technology-fg); }
.stem-stem-integration { background: var(--integration-bg); color: var(--integration-fg); }

/* ── Category pill badge on checkpoint page ───────────────── */
.category-badge-pill {
  font-size: .8rem;
  padding: .4rem 1rem;
  border-radius: 999px;
}

/* ── Checkpoint page ──────────────────────────────────────── */
.checkpoint-header { padding: 1rem 0 .5rem; }

.checkpoint-icon {
  font-size: 3.5rem;
  margin-bottom: .5rem;
  animation: floatBounce 4s ease-in-out infinite;
}

.points-badge {
  display: inline-block;
  background: var(--yellow-pale);
  color: var(--orange-accent);
  padding: .3rem .9rem;
  border-radius: 999px;
  font-weight: 800;
  font-size: .95rem;
  margin-top: .3rem;
}

/* ── Question Card ────────────────────────────────────────── */
.question-card { border: none; }

.question-text h2 {
  font-size: 1.15rem;
  line-height: 1.5;
}

/* ── MCQ Option Cards ─────────────────────────────────────── */
.option-label { cursor: pointer; display: block; }

.option-card {
  display: flex;
  align-items: center;
  gap: .75rem;
  background: #fff;
  border: 2.5px solid #e9ecef;
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
  font-weight: 600;
  font-size: .97rem;
  min-height: 56px;
}

.option-card:hover {
  border-color: var(--green-mid);
  background: var(--green-pale);
  transform: translateY(-2px);
}

.option-radio:checked + .option-card {
  border-color: var(--green-mid);
  background: var(--green-pale);
  box-shadow: 0 0 0 3px rgba(45,154,78,.15);
}

.option-letter {
  width: 2rem;
  height: 2rem;
  background: var(--green-mid);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: .85rem;
  flex-shrink: 0;
}

.option-text { line-height: 1.3; }

/* ── Clue Box ─────────────────────────────────────────────── */
.clue-box {
  background: linear-gradient(135deg, #f0fdf4, #dcfce7);
  border-left: 4px solid var(--green-mid);
}

/* ── Passport Page ────────────────────────────────────────── */
.participant-header { padding: 1rem 0; }

.participant-avatar {
  width: 72px;
  height: 72px;
  background: linear-gradient(135deg, var(--green-mid), var(--green-dark));
  color: #fff;
  border-radius: 50%;
  font-size: 2rem;
  font-weight: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto;
  box-shadow: 0 4px 16px rgba(26,92,42,.3);
}

.points-display {
  background: linear-gradient(135deg, var(--yellow-warm), #f59e0b);
  color: var(--text-dark);
  border-radius: var(--radius-xl);
  padding: .75rem 2rem;
  display: inline-block;
  margin-top: .5rem;
}

.points-number { font-size: 2.4rem; font-weight: 900; line-height: 1; }
.points-label  { font-size: .8rem; font-weight: 700; opacity: .8; text-transform: uppercase; letter-spacing: 1px; }

/* Passport Card */
.passport-card-header {
  background: linear-gradient(135deg, var(--green-dark), var(--green-mid));
  color: #fff;
  border-radius: var(--radius-xl) var(--radius-xl) 0 0 !important;
}

.passport-row {
  transition: background var(--transition-fast);
}

.passport-row.done     { background: #f0fdf4; }
.passport-row.locked   { background: #f8f9fa; opacity: .65; }
.passport-row.available { background: #fffbeb; }

.passport-icon { font-size: 1.5rem; }

.stamp-check {
  font-size: 1.5rem;
  color: var(--green-mid);
  font-weight: 900;
}

.stamp-lock { font-size: 1.2rem; }

/* ── Leaderboard ──────────────────────────────────────────── */
.leaderboard-header {
  background: linear-gradient(135deg, var(--green-dark), var(--green-mid));
  color: #fff;
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.leaderboard-row {
  border-bottom: 1px solid #f0f0f0;
  transition: background var(--transition-fast);
}
.leaderboard-row:hover    { background: #f8fdf9; }
.leaderboard-row:last-child { border-bottom: none; }
.leaderboard-top  { background: #fffbeb; }
.leaderboard-me   { background: #e8f4fd !important; font-weight: 700; }

.points-pill {
  background: var(--green-pale);
  color: var(--green-dark);
  padding: .25rem .75rem;
  border-radius: 999px;
  font-weight: 800;
  font-size: .95rem;
}

/* ── Completed Page ───────────────────────────────────────── */
.completed-hero { }
.confetti-emojis {
  font-size: 2.5rem;
  letter-spacing: .5rem;
  animation: floatBounce 2.5s ease-in-out infinite;
}

.achievement-badge {
  font-size: 4rem;
  animation: spin 6s linear infinite;
}
@keyframes spin {
  0%   { transform: rotate(0deg); }
  15%  { transform: rotate(15deg); }
  30%  { transform: rotate(-15deg); }
  45%  { transform: rotate(10deg); }
  60%  { transform: rotate(-10deg); }
  75%  { transform: rotate(5deg); }
  100% { transform: rotate(0deg); }
}

.stat-box { border-radius: var(--radius-lg); }
.stat-number { font-size: 2rem; font-weight: 900; line-height: 1.1; }
.stat-label  { font-size: .75rem; text-transform: uppercase; letter-spacing: 1px; font-weight: 700; opacity: .7; }

/* ── Footer ───────────────────────────────────────────────── */
.footer-bar {
  background: #fff;
  border-top: 1px solid #e9ecef;
}

/* ── How It Works Section ─────────────────────────────────── */
.how-it-works { }
.stem-categories { background: #f8fdf9; }

/* ── Forms ────────────────────────────────────────────────── */
.form-control:focus, .form-select:focus {
  border-color: var(--green-mid);
  box-shadow: 0 0 0 0.2rem rgba(45,154,78,.2);
}

/* ── Alerts ───────────────────────────────────────────────── */
.alert { border: none; font-weight: 600; }
.alert-success { background: #d4edda; color: #155724; }
.alert-danger  { background: #f8d7da; color: #721c24; }
.alert-warning { background: #fff3cd; color: #856404; }
.alert-info    { background: #cce5ff; color: #004085; }

/* ── Responsive fine-tuning ───────────────────────────────── */
@media (max-width: 576px) {
  .hero-section { padding: 2.5rem 1rem 2rem; }
  .hero-title { font-size: 1.7rem; }
  .option-card { min-height: 50px; font-size: .9rem; }
  .points-number { font-size: 2rem; }
}

/* ── Utility ──────────────────────────────────────────────── */
.rounded-4 { border-radius: var(--radius-lg) !important; }
.rounded-top-4 { border-top-left-radius: var(--radius-lg) !important; border-top-right-radius: var(--radius-lg) !important; }

/* Smooth hover on all cards */
.card:hover { box-shadow: 0 8px 24px rgba(0,0,0,.1); }