/* ═══════════════════════════════════════════════════
   BLUESTOCK BRAND CSS — Demo-Ready, Brand Compliant
   Fonts: Poppins (primary) · Open Sans (secondary)
   Icons: Bootstrap Icons · Framework: Bootstrap 5.3.3
═══════════════════════════════════════════════════ */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700;800&family=Open+Sans:wght@400;500;600&display=swap');

:root {
  --primary:        #414BEA;
  --primary-dark:   #190482;
  --primary-mid:    #525CEB;
  --secondary:      #7752FE;
  --accent:         #F05537;
  --dark:           #222222;
  --dark-mid:       #3D3B40;
  --bg:             #F6F5F5;
  --white:          #FFFFFF;
  --tint-blue:      #D9E2FF;
  --tint-sky:       #DDF2FD;
  --tint-steel:     #C2D9FF;
  --tint-lavender:  #BFCFE7;
  --tint-purple:    #F8EDFF;
  --card-shadow:    0 4px 24px rgba(65,75,234,0.10);
  --radius:         14px;
  --font:           'Poppins', sans-serif;
  --font2:          'Open Sans', sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--dark);
  min-height: 100vh;
}

/* ── LOADING SCREEN ── */
#loading-screen {
  position: fixed; inset: 0;
  background: rgba(246,245,245,0.95);
  backdrop-filter: blur(8px);
  display: flex; align-items: center; justify-content: center;
  z-index: 9999;
  transition: opacity 0.5s;
}
#loading-screen.fade-out { opacity: 0; pointer-events: none; }
#loading-content { text-align: center; width: 280px; }
#progress-bar-container {
  width: 100%; background: #ddd; border-radius: 6px;
  height: 8px; overflow: hidden; margin: 10px 0;
}
#progress-bar {
  height: 100%; width: 0;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: 6px;
  transition: width 0.3s ease;
}

/* ── AUTH OVERLAY ── */
.auth-overlay {
  position: fixed; inset: 0;
  background: rgba(25,4,130,0.55);
  backdrop-filter: blur(6px);
  display: flex; align-items: center; justify-content: center;
  z-index: 500;
  animation: fadeIn 0.4s ease;
}
.auth-card {
  background: var(--white);
  border-radius: 20px;
  padding: 40px 36px;
  width: 100%; max-width: 420px;
  box-shadow: 0 20px 60px rgba(65,75,234,0.25);
  text-align: center;
  animation: slideUp 0.4s cubic-bezier(.36,1.1,.64,1);
}
.auth-title {
  font-size: 1.4rem; font-weight: 800;
  color: var(--dark); margin-bottom: 6px;
}
.auth-sub {
  font-family: var(--font2); font-size: 0.92rem;
  color: var(--dark-mid); margin-bottom: 24px;
}
.auth-input {
  width: 100%; padding: 12px 16px;
  border: 2px solid #e0e0e0; border-radius: 10px;
  font-family: var(--font2); font-size: 1rem;
  outline: none; transition: border-color 0.2s;
}
.auth-input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(65,75,234,0.12); }
.auth-divider {
  display: flex; align-items: center; gap: 12px;
  margin: 16px 0; color: #bbb; font-size: 0.85rem;
}
.auth-divider::before, .auth-divider::after {
  content: ""; flex: 1; height: 1px; background: #eee;
}
.auth-note { font-family: var(--font2); font-size: 0.82rem; color: #999; }

/* ── NAVBAR ── */
.navbar-bluestock {
  background: var(--white);
  border-bottom: 2.5px solid var(--primary);
  padding: 0 32px; height: 64px;
  display: flex; align-items: center; justify-content: space-between;
  box-shadow: 0 2px 12px rgba(65,75,234,0.08);
  position: sticky; top: 0; z-index: 100;
}
.navbar-bluestock .logo img { height: 38px; object-fit: contain; }
.navbar-bluestock .nav-links { display: flex; gap: 4px; align-items: center; }
.navbar-bluestock .nav-links a {
  font-family: var(--font); color: var(--dark); text-decoration: none;
  font-weight: 500; font-size: 0.9rem; padding: 7px 14px;
  border-radius: 8px; transition: all 0.2s;
}
.navbar-bluestock .nav-links a:hover { background: var(--tint-blue); color: var(--primary); }
.user-chip {
  background: var(--tint-blue); color: var(--primary);
  font-family: var(--font); font-weight: 600; font-size: 0.82rem;
  padding: 5px 14px; border-radius: 999px;
}

/* ── PAGE ── */
.page-container { max-width: 880px; margin: 40px auto; padding: 0 20px; }
.page-title {
  font-size: 2rem; font-weight: 800; color: var(--dark);
  margin-bottom: 4px; letter-spacing: -0.5px;
}
.page-subtitle { font-family: var(--font2); color: var(--dark-mid); margin-bottom: 28px; font-size: 0.97rem; }

/* ── PUZZLE CARD ── */
.puzzle-card {
  background: var(--white); border-radius: var(--radius);
  padding: 32px; box-shadow: var(--card-shadow);
  margin-bottom: 28px; border: 1.5px solid var(--tint-blue);
}

/* ── SOLVED BANNER ── */
.solved-banner {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: var(--white); border-radius: 10px;
  padding: 14px 20px; margin-bottom: 18px;
  font-family: var(--font); font-weight: 600; font-size: 0.95rem;
  display: flex; align-items: center; flex-wrap: wrap; gap: 8px;
  animation: slideUp 0.4s ease;
}

/* ── PUZZLE QUESTION ── */
.puzzle-question {
  font-size: 1.3rem; font-weight: 600; color: var(--dark);
  background: linear-gradient(135deg, var(--tint-blue), #eef0ff);
  border-left: 5px solid var(--primary);
  border-radius: 10px; padding: 20px 24px;
  margin: 16px 0; min-height: 64px; line-height: 1.6;
  transition: all 0.3s ease;
}
.puzzle-question:empty::before {
  content: "Press 'Start Puzzle' to begin!";
  color: #aaa; font-weight: 400; font-size: 0.95rem; font-family: var(--font2);
}

/* ── ANSWER INPUT ── */
.answer-row { display: flex; gap: 12px; margin: 16px 0; }
.answer-input {
  flex: 1; padding: 12px 18px;
  border: 2px solid #e0e0e0; border-radius: 10px;
  font-size: 1rem; font-family: var(--font2);
  transition: border-color 0.2s, box-shadow 0.2s;
  outline: none; background: var(--white); color: var(--dark);
}
.answer-input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(65,75,234,0.12); }
.answer-input:disabled { background: var(--bg); cursor: not-allowed; color: #aaa; }
.answer-input::placeholder { color: #bbb; }

/* ── BUTTONS ── */
.btn-primary-bs {
  background: var(--primary); color: var(--white); border: none;
  padding: 11px 24px; border-radius: 10px;
  font-size: 0.92rem; font-weight: 600; font-family: var(--font);
  cursor: pointer; transition: all 0.2s;
  display: inline-flex; align-items: center; gap: 6px;
}
.btn-primary-bs:hover { background: var(--primary-mid); transform: translateY(-1px); box-shadow: 0 4px 16px rgba(65,75,234,0.28); }
.btn-primary-bs:active { transform: translateY(0); }

.btn-accent-bs {
  background: var(--accent); color: var(--white); border: none;
  padding: 11px 24px; border-radius: 10px;
  font-size: 0.92rem; font-weight: 600; font-family: var(--font);
  cursor: pointer; transition: all 0.2s;
  display: inline-flex; align-items: center; gap: 6px;
}
.btn-accent-bs:hover { background: #d43d20; transform: translateY(-1px); box-shadow: 0 4px 16px rgba(240,85,55,0.28); }

.btn-outline-bs {
  background: transparent; color: var(--primary);
  border: 2px solid var(--primary); padding: 9px 20px;
  border-radius: 10px; font-size: 0.92rem; font-weight: 600; font-family: var(--font);
  cursor: pointer; transition: all 0.2s;
  display: inline-flex; align-items: center; gap: 6px;
}
.btn-outline-bs:hover { background: var(--tint-blue); transform: translateY(-1px); }

.btn-row { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 14px; }
.w-100 { width: 100% !important; }
.mt-3 { margin-top: 12px !important; }

/* ── STATUS TEXT ── */
.timer-display {
  font-family: var(--font2); font-size: 0.97rem; font-weight: 600;
  color: var(--primary); margin: 12px 0 4px; min-height: 22px;
}
.streak-display {
  font-family: var(--font); font-size: 1.05rem; font-weight: 700;
  color: var(--accent); margin: 6px 0; min-height: 22px;
}
.hints-left { font-family: var(--font2); font-size: 0.83rem; color: var(--dark-mid); margin-top: 8px; }

/* ── FEEDBACK ── */
.feedback {
  padding: 12px 18px; border-radius: 10px;
  font-family: var(--font2); font-weight: 600;
  margin-top: 14px; display: none; font-size: 0.93rem;
  align-items: center; gap: 8px;
}
.feedback.success { background: #e8f9ef; color: #1a7a38; border: 1.5px solid #2da44e; display: flex; }
.feedback.error   { background: #fff0ee; color: #c0392b; border: 1.5px solid #e74c3c; display: flex; }
.feedback.info    { background: var(--tint-blue); color: var(--primary-dark); border: 1.5px solid var(--primary); display: flex; }

/* ── SCORE BADGE ── */
.score-badge {
  display: inline-block;
  background: rgba(255,255,255,0.25);
  color: var(--white); font-family: var(--font);
  font-weight: 800; font-size: 1rem;
  padding: 4px 16px; border-radius: 999px;
  animation: scorePop 0.4s cubic-bezier(.36,1.6,.64,1);
}

/* ── COMPLETION ANIMATION ── */
.completion-anim {
  text-align: center; padding: 20px;
  animation: slideUp 0.5s cubic-bezier(.36,1.2,.64,1);
}
.confetti-burst { font-size: 3rem; animation: bounce 0.6s infinite alternate; }
.completion-msg {
  font-family: var(--font); font-weight: 800; font-size: 1.3rem;
  color: var(--primary); margin-top: 8px;
}

/* ── HEATMAP ── */
.heatmap-container {
  background: var(--white); border-radius: var(--radius);
  padding: 28px 32px; box-shadow: var(--card-shadow);
  border: 1.5px solid var(--tint-blue); overflow-x: auto;
}
.heatmap-container h2 {
  font-family: var(--font); font-size: 1.1rem; font-weight: 700;
  color: var(--dark); margin-bottom: 18px;
}
#heatmap {
  display: grid; grid-template-rows: repeat(7, 14px);
  grid-auto-flow: column; gap: 3px; width: fit-content;
}
.heatmap-cell {
  width: 14px; height: 14px; background: #ebedf0;
  border-radius: 3px; transform: scale(0.9);
  transition: all 0.3s ease; cursor: pointer;
}
.heatmap-cell.active  { transform: scale(1); animation: cellReveal 0.4s ease; }
.heatmap-cell.level-1 { background: var(--tint-steel); }
.heatmap-cell.level-2 { background: #7099e8; }
.heatmap-cell.level-3 { background: var(--primary); }
.heatmap-cell.level-4 { background: var(--primary-dark); }
.heatmap-cell.today   { outline: 2.5px solid var(--accent); outline-offset: 1px; }
.heatmap-cell:hover   { transform: scale(1.45); box-shadow: 0 0 6px rgba(65,75,234,0.3); z-index: 10; position: relative; }

.heatmap-legend {
  display: flex; align-items: center; gap: 4px;
  margin-top: 14px; font-family: var(--font2); font-size: 12px; color: var(--dark-mid);
}
.legend-box { width: 14px; height: 14px; border-radius: 3px; cursor: help; }
.legend-0 { background: #ebedf0; }
.legend-1 { background: var(--tint-steel); }
.legend-2 { background: #7099e8; }
.legend-3 { background: var(--primary); }
.legend-4 { background: var(--primary-dark); }

/* ── FOOTER ── */
.page-footer {
  background: var(--dark); color: #ccc; text-align: center;
  padding: 20px; font-family: var(--font2); font-size: 0.82rem; margin-top: 48px;
}
.page-footer a { color: var(--tint-blue); text-decoration: none; }

/* ── ANIMATIONS ── */
@keyframes fadeIn    { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp   { from { transform: translateY(24px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
@keyframes scorePop  { 0% { transform: scale(0.5); opacity: 0; } 100% { transform: scale(1); opacity: 1; } }
@keyframes bounce    { from { transform: scale(1); } to { transform: scale(1.2); } }
@keyframes cellReveal{ 0% { transform: scale(0.3); opacity: 0; } 100% { transform: scale(1); opacity: 1; } }
@keyframes pulse     { 0%,100% { box-shadow: 0 0 0 0 rgba(65,75,234,0.4); } 50% { box-shadow: 0 0 0 8px rgba(65,75,234,0); } }

.pulse { animation: pulse 1.5s infinite; }

/* ── RESPONSIVE ── */
@media (max-width: 600px) {
  .page-container { padding: 0 12px; margin: 20px auto; }
  .puzzle-card, .heatmap-container { padding: 20px 14px; }
  .btn-row, .answer-row { flex-direction: column; }
  .navbar-bluestock { padding: 0 14px; }
  .navbar-bluestock .nav-links { display: none; }
  .page-title { font-size: 1.5rem; }
  .auth-card { margin: 16px; padding: 28px 20px; }
}