:root {
  --bg-page: #f8fafc;
  --bg-card: #ffffff;
  --bg-soft: #f1f5f9;
  --border-light: #e2e8f0;
  --border-focus: #2563eb;
  --blue: #2563eb;
  --purple: #7c3aed;
  --emerald: #059669;
  --amber: #d97706;
  --rose: #e11d48;
  --text-main: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --font-sans: 'Plus Jakarta Sans', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-page);
  background-image:
    radial-gradient(circle at 15% 10%, rgba(37, 99, 235, 0.05) 0%, transparent 40%),
    radial-gradient(circle at 85% 15%, rgba(124, 58, 237, 0.05) 0%, transparent 40%);
  color: var(--text-main);
  font-family: var(--font-sans);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.5;
}

#app, #root {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Top Navigation Bar */
.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 28px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-light);
  position: sticky;
  top: 0;
  z-index: 50;
  gap: 12px;
  flex-wrap: wrap;
}

.brand-cluster {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: #2563eb;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}

.brand-title {
  font-weight: 800;
  font-size: 15.5px;
  color: #0f172a;
  letter-spacing: -0.2px;
}

.brand-sub {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
}

.mode-pills {
  display: flex;
  align-items: center;
  gap: 4px;
  background: #f1f5f9;
  padding: 4px;
  border-radius: 10px;
  flex-wrap: wrap;
}

.mode-pill {
  border: none;
  background: transparent;
  color: var(--text-secondary);
  padding: 6px 14px;
  border-radius: 7px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  display: flex;
  align-items: center;
  gap: 6px;
}

.mode-pill:hover {
  color: #0f172a;
}

.mode-pill.active {
  background: #ffffff;
  color: var(--blue);
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.08);
}

.top-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

/* Stage Controller Bar */
.stage-nav-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  background: #ffffff;
  border-bottom: 1px solid var(--border-light);
  flex-wrap: wrap;
}

.stage-step-btn {
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-secondary);
  padding: 7px 14px;
  border-radius: 9px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  display: flex;
  align-items: center;
  gap: 7px;
}

.stage-step-btn:hover {
  background: #f1f5f9;
  color: #0f172a;
}

.stage-step-btn.active {
  background: #eff6ff;
  color: var(--blue);
  border-color: #bfdbfe;
  font-weight: 700;
}

/* Clean Modern Buttons */
.btn {
  border: 1px solid #cbd5e1;
  background: #ffffff;
  color: var(--text-main);
  padding: 8px 15px;
  border-radius: 10px;
  font-size: 13.5px;
  font-weight: 600;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all 0.15s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  text-decoration: none;
}

.btn:hover {
  background: #f8fafc;
  border-color: #94a3b8;
}

.btn-primary {
  background: #2563eb;
  color: #ffffff;
  border-color: #2563eb;
}

.btn-primary:hover {
  background: #1d4ed8;
  border-color: #1d4ed8;
  color: #ffffff;
}

.btn-purple {
  background: #7c3aed;
  color: #ffffff;
  border-color: #7c3aed;
}

.btn-purple:hover {
  background: #6d28d9;
  border-color: #6d28d9;
  color: #ffffff;
}

.btn-emerald {
  background: #059669;
  color: #ffffff;
  border-color: #059669;
}

.btn-emerald:hover {
  background: #047857;
  border-color: #047857;
  color: #ffffff;
}

.btn-amber {
  background: #f59e0b;
  color: #ffffff;
  border-color: #f59e0b;
}

.btn-danger {
  background: #fff1f2;
  color: #e11d48;
  border-color: #fecdd3;
}

.btn-danger:hover {
  background: #ffe4e6;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 12.5px;
  border-radius: 8px;
}

.btn-lg {
  padding: 11px 22px;
  font-size: 14.5px;
  border-radius: 11px;
}

/* Containers & Grids */
.main-container {
  max-width: 1280px;
  width: 100%;
  margin: 0 auto;
  padding: 24px;
  flex: 1;
}

.student-container {
  max-width: 600px;
  width: 100%;
  margin: 0 auto;
  padding: 20px 16px 60px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 4px 16px rgba(15, 23, 42, 0.03);
}

.card-neon {
  border-color: #cbd5e1;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 20px;
}

.grid-equal {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

@media (max-width: 980px) {
  .grid-2, .grid-equal, .grid-3 {
    grid-template-columns: 1fr;
  }
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 11.5px;
  font-weight: 700;
}

.badge-cyan {
  background: #eff6ff;
  color: #1d4ed8;
}

.badge-purple {
  background: #f5f3ff;
  color: #6d28d9;
}

.badge-amber {
  background: #fef3c7;
  color: #b45309;
}

.badge-emerald {
  background: #ecfdf5;
  color: #047857;
}

/* Code Block */
.code-terminal {
  background: #0f172a;
  border-radius: 12px;
  overflow: hidden;
  margin: 14px 0;
}

.code-terminal-header {
  background: #1e293b;
  padding: 8px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 12px;
  color: #94a3b8;
}

.window-dots {
  display: flex;
  gap: 6px;
}

.window-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.code-terminal pre {
  padding: 16px 18px;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.65;
  color: #f8fafc;
  overflow-x: auto;
  white-space: pre;
}

/* Quiz Options */
.quiz-options-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 12px;
}

@media (max-width: 680px) {
  .quiz-options-grid {
    grid-template-columns: 1fr;
  }
}

.quiz-option-btn {
  text-align: left;
  padding: 13px 16px;
  border-radius: 12px;
  border: 1px solid #cbd5e1;
  background: #ffffff;
  color: var(--text-main);
  font-size: 14.5px;
  font-weight: 600;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all 0.15s;
  display: flex;
  align-items: center;
  gap: 12px;
}

.quiz-option-btn:hover {
  border-color: #2563eb;
  background: #f8fafc;
}

.quiz-option-btn.selected {
  border-color: #2563eb;
  background: #eff6ff;
  color: #1e3a8a;
}

.quiz-option-btn.correct {
  border-color: #059669;
  background: #ecfdf5;
  color: #065f46;
}

.quiz-option-btn.wrong {
  border-color: #fda4af;
  background: #fff1f2;
  color: #9f1239;
  opacity: 0.75;
}

.opt-letter {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: #f1f5f9;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13px;
  color: #334155;
  flex-shrink: 0;
}

/* Question Number Pills */
.q-num-pill {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  border: 1px solid var(--border-light);
  background: #ffffff;
  color: var(--text-secondary);
  font-weight: 700;
  font-size: 13px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
}

.q-num-pill.answered {
  background: #eff6ff;
  border-color: #93c5fd;
  color: #1d4ed8;
}

.q-num-pill.active {
  background: #2563eb;
  border-color: #2563eb;
  color: #ffffff;
}

/* Podium Cards */
.podium-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  align-items: end;
  margin: 18px 0;
}

@media (max-width: 720px) {
  .podium-grid {
    grid-template-columns: 1fr;
  }
}

.podium-card {
  border-radius: 16px;
  padding: 20px 16px;
  text-align: center;
  border: 1px solid var(--border-light);
  background: #ffffff;
}

.podium-gold {
  border-color: #fcd34d;
  background: linear-gradient(180deg, #fffbeb 0%, #ffffff 100%);
}

.podium-silver {
  border-color: #cbd5e1;
  background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
}

.podium-bronze {
  border-color: #fed7aa;
  background: linear-gradient(180deg, #fff7ed 0%, #ffffff 100%);
}

/* Student Chips in Lobby */
.student-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 12px;
}

.student-chip {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  border-radius: 12px;
  background: #ffffff;
  border: 1px solid var(--border-light);
}

/* Form Elements */
.form-group {
  margin-bottom: 14px;
}

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 6px;
}

.form-input, .form-textarea, .form-select {
  width: 100%;
  padding: 10px 13px;
  border-radius: 10px;
  border: 1px solid #cbd5e1;
  background: #ffffff;
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 14px;
  outline: none;
  transition: border-color 0.15s;
}

.form-input:focus, .form-textarea:focus, .form-select:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

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

/* Selectable Tag Chips */
.tag-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 10px;
}

.tag-chip {
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 12.5px;
  font-weight: 600;
  border: 1px solid var(--border-light);
  background: #f8fafc;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s;
}

.tag-chip.active {
  background: #eff6ff;
  border-color: #2563eb;
  color: #1d4ed8;
}

/* Rating Stars */
.rating-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 9px 12px;
  background: #f8fafc;
  border-radius: 10px;
  margin-bottom: 6px;
  border: 1px solid var(--border-light);
  gap: 10px;
  flex-wrap: wrap;
}

.rating-stars {
  display: flex;
  gap: 5px;
}

.star-btn {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  border: 1px solid var(--border-light);
  background: #ffffff;
  color: var(--text-muted);
  font-weight: 700;
  font-size: 12.5px;
  cursor: pointer;
  transition: all 0.15s;
}

.star-btn.active {
  background: #fbbf24;
  color: #78350f;
  border-color: #f59e0b;
}

/* Floating Emoji Reactions */
#floating-reactions {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 99;
  overflow: hidden;
}

.floating-emoji {
  position: absolute;
  bottom: 20px;
  animation: floatUp 3s ease-out forwards;
  display: flex;
  align-items: center;
  gap: 6px;
  background: #ffffff;
  padding: 5px 12px;
  border-radius: 999px;
  border: 1px solid var(--border-light);
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.08);
  color: var(--text-main);
  font-size: 13px;
  font-weight: 600;
}

@keyframes floatUp {
  0% { transform: translateY(0) scale(0.9); opacity: 0; }
  15% { transform: translateY(-35px) scale(1); opacity: 1; }
  100% { transform: translateY(-380px) scale(0.95); opacity: 0; }
}

/* Modal */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.4);
  backdrop-filter: blur(4px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-box {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: 18px;
  max-width: 720px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  padding: 24px;
  box-shadow: 0 20px 50px rgba(15, 23, 42, 0.15);
}

/* Memory Cards Grid */
.memory-wall-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
}

.memory-card-item {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: 14px;
  padding: 18px;
  transition: all 0.2s;
}

.memory-card-item:hover {
  border-color: #93c5fd;
  box-shadow: 0 6px 20px rgba(15, 23, 42, 0.05);
}

/* Official Teacher Report Print Styling */
.report-sheet {
  background: #ffffff;
  color: #0f172a;
  border-radius: 14px;
  border: 1px solid var(--border-light);
  padding: 32px;
  max-width: 1060px;
  margin: 0 auto;
}

.report-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 10px;
  font-size: 13px;
}

.report-table th, .report-table td {
  border: 1px solid #e2e8f0;
  padding: 9px 12px;
  text-align: left;
  vertical-align: top;
}

.report-table th {
  background: #f8fafc;
  font-weight: 700;
  color: #0f172a;
}

@media print {
  body {
    background: #ffffff !important;
    color: #000000 !important;
  }
  .top-bar, .stage-nav-bar, .no-print, #floating-reactions {
    display: none !important;
  }
  .main-container {
    padding: 0 !important;
    max-width: 100% !important;
  }
  .report-sheet {
    border: none !important;
    padding: 0 !important;
  }
}