/* ==========================================================================
   KABLE ACADEMY EXAM ENGINE - DESIGN SYSTEM & STYLESHEET
   ========================================================================== */

:root {
  --bg-primary: #0b132b;
  --bg-secondary: #1c2541;
  --bg-card: rgba(28, 37, 65, 0.85);
  --bg-card-hover: rgba(58, 80, 107, 0.5);
  --accent-cyan: #00b4d8;
  --accent-blue: #0077b6;
  --accent-glow: rgba(0, 180, 216, 0.35);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dark: #0f172a;
  --border-color: rgba(255, 255, 255, 0.12);
  --border-glow: rgba(0, 180, 216, 0.5);
  
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;
  --color-info: #3b82f6;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'Fira Code', 'Consolas', 'Courier New', monospace;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.35);
  --shadow-glow: 0 0 20px rgba(0, 180, 216, 0.25);
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme Overrides */
body.light-theme {
  --bg-primary: #f1f5f9;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #e2e8f0;
  --accent-cyan: #0284c7;
  --accent-blue: #0369a1;
  --accent-glow: rgba(2, 132, 199, 0.2);
  --text-main: #0f172a;
  --text-muted: #64748b;
  --border-color: #cbd5e1;
  --shadow-soft: 0 10px 25px rgba(0, 0, 0, 0.08);
}

/* General Reset & Layout */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.6;
  overflow-x: hidden;
}

/* Header & Navbar */
.kable-header {
  background: rgba(11, 19, 43, 0.9);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 2rem;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-soft);
}

.header-container {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 800;
  font-size: 1.35rem;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

.brand-icon {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
  color: #fff;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  box-shadow: var(--shadow-glow);
}

.brand-badge {
  background: rgba(0, 180, 216, 0.15);
  color: var(--accent-cyan);
  font-size: 0.75rem;
  padding: 0.2rem 0.6rem;
  border-radius: 20px;
  border: 1px solid var(--accent-cyan);
  font-weight: 600;
  letter-spacing: 0.5px;
}

.nav-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Status Indicator Pill */
.connection-status-pill {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(16, 185, 129, 0.15);
  color: var(--color-success);
  border: 1px solid rgba(16, 185, 129, 0.3);
  padding: 0.3rem 0.8rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
}

.connection-status-pill.offline {
  background: rgba(239, 68, 68, 0.15);
  color: var(--color-danger);
  border-color: rgba(239, 68, 68, 0.3);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: currentColor;
  display: inline-block;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
  100% { opacity: 1; transform: scale(1); }
}

/* Buttons */
.btn-kable {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--text-main);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition);
}

.btn-kable:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-cyan);
}

.btn-xs {
  font-size: 0.75rem;
  padding: 0.25rem 0.5rem;
}

.btn-primary-kable {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
  border: none;
  color: #ffffff;
  box-shadow: 0 4px 15px rgba(0, 180, 216, 0.3);
}

.btn-primary-kable:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 180, 216, 0.45);
}

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

.btn-outline-cyan:hover {
  background: rgba(0, 180, 216, 0.15);
}

/* Main Container */
.main-wrapper {
  max-width: 1400px;
  margin: 2rem auto;
  padding: 0 1.5rem;
  width: 100%;
  flex: 1;
}

/* Screens Management */
.screen-view {
  display: none;
}

.screen-view.active {
  display: block;
  animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Login Screen & Alert Boxes */
.portal-card {
  max-width: 580px;
  margin: 3rem auto;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-soft);
}

.portal-title {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.portal-subtitle {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
}

.alert-box-kable {
  border-radius: var(--radius-sm);
  padding: 1rem;
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
  line-height: 1.5;
}

.alert-box-kable.error {
  background: rgba(239, 68, 68, 0.12);
  border: 1px solid var(--color-danger);
  color: #fca5a5;
}

.alert-box-kable.warning {
  background: rgba(245, 158, 11, 0.12);
  border: 1px solid var(--color-warning);
  color: #fde047;
}

.alert-box-kable.info {
  background: rgba(0, 180, 216, 0.12);
  border: 1px solid var(--accent-cyan);
  color: #90e0ef;
}

.form-group-kable {
  margin-bottom: 1.2rem;
}

.form-group-kable label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
  color: var(--text-muted);
}

.form-control-kable {
  width: 100%;
  padding: 0.75rem 1rem;
  background: rgba(11, 19, 43, 0.6);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-size: 0.95rem;
  transition: var(--transition);
}

.form-control-kable:focus {
  outline: none;
  border-color: var(--accent-cyan);
  box-shadow: 0 0 10px var(--accent-glow);
}

.resume-alert-box {
  background: rgba(0, 180, 216, 0.1);
  border: 1px solid var(--accent-cyan);
  border-radius: var(--radius-sm);
  padding: 1rem;
  margin-bottom: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.roster-badge {
  font-size: 0.75rem;
  padding: 0.2rem 0.5rem;
  border-radius: 12px;
  font-weight: 600;
}

.roster-badge.allowed {
  background: rgba(16, 185, 129, 0.15);
  color: var(--color-success);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.roster-badge.completed {
  background: rgba(245, 158, 11, 0.15);
  color: var(--color-warning);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

/* Exam Screen Layout */
.exam-header-bar {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem 1.5rem;
  margin-bottom: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.student-info-tag {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.student-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent-cyan);
  color: var(--text-dark);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.timer-box {
  background: rgba(0, 0, 0, 0.3);
  padding: 0.5rem 1.2rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent-cyan);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.timer-box.warning {
  color: var(--color-danger);
  border-color: var(--color-danger);
  animation: pulse 1s infinite;
}

.progress-container-kable {
  width: 100%;
  height: 8px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
  overflow: hidden;
  margin-top: 0.75rem;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-blue));
  width: 0%;
  transition: width 0.3s ease;
}

/* Exam Grid Layout */
.exam-layout-grid {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 1.5rem;
}

@media (max-width: 992px) {
  .exam-layout-grid {
    grid-template-columns: 1fr;
  }
}

/* Question Navigator Sidebar */
.question-nav-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  height: fit-content;
}

.nav-grid-buttons {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.5rem;
  margin-top: 1rem;
  max-height: 400px;
  overflow-y: auto;
  padding-right: 0.25rem;
}

.q-nav-btn {
  aspect-ratio: 1;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.q-nav-btn:hover {
  border-color: var(--accent-cyan);
}

.q-nav-btn.active {
  border-color: var(--accent-cyan);
  background: var(--accent-cyan);
  color: var(--text-dark);
  font-weight: 700;
  box-shadow: 0 0 10px var(--accent-glow);
}

.q-nav-btn.answered {
  background: rgba(16, 185, 129, 0.2);
  border-color: var(--color-success);
  color: var(--color-success);
}

.q-nav-btn.pbq-btn {
  border-color: var(--color-warning);
  color: var(--color-warning);
}

.q-nav-btn.pbq-btn.answered {
  background: rgba(245, 158, 11, 0.2);
}

/* Main Question Card */
.question-display-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  min-height: 500px;
}

.question-meta-tags {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.meta-tag {
  background: rgba(255, 255, 255, 0.08);
  font-size: 0.75rem;
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  color: var(--text-muted);
  font-weight: 600;
}

.question-text-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

/* MCQ Options */
.mcq-options-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-bottom: 2rem;
}

.mcq-option-card {
  background: rgba(11, 19, 43, 0.5);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 1rem 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 1rem;
  transition: var(--transition);
}

.mcq-option-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-cyan);
}

.mcq-option-card.selected {
  border-color: var(--accent-cyan);
  background: rgba(0, 180, 216, 0.15);
  box-shadow: 0 0 12px var(--accent-glow);
}

.option-radio-dot {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.mcq-option-card.selected .option-radio-dot {
  border-color: var(--accent-cyan);
  background: var(--accent-cyan);
}

.mcq-option-card.selected .option-radio-dot::after {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-dark);
}

/* Exam Controls Footer */
.question-footer-controls {
  margin-top: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
}

/* Simulation Lab Component Styles */
.pbq-header-card {
  background: rgba(0, 180, 216, 0.08);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  margin-bottom: 1.5rem;
}

.pbq-badge {
  color: var(--accent-cyan);
  font-weight: 700;
  font-size: 0.75rem;
  margin-bottom: 0.25rem;
}

.pbq-title {
  font-size: 1.2rem;
  margin-bottom: 0.4rem;
}

.pbq-instructions {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Sim 1: Terminal */
.sim-terminal-window {
  background: #090d16;
  border: 1px solid #1e293b;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  overflow: hidden;
  box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.8);
  margin-bottom: 1rem;
}

.term-topbar {
  background: #0f172a;
  padding: 0.5rem 1rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  border-bottom: 1px solid #1e293b;
}

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

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.dot.red { background: #ef4444; }
.dot.yellow { background: #f59e0b; }
.dot.green { background: #10b981; }

.term-title {
  color: #94a3b8;
  font-size: 0.8rem;
}

.term-body {
  padding: 1rem;
  min-height: 260px;
  max-height: 380px;
  overflow-y: auto;
  color: #38bdf8;
}

.term-line {
  margin-bottom: 0.35rem;
  white-space: pre-wrap;
  font-size: 0.9rem;
}

.term-output {
  color: #cbd5e1;
}

.term-input-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.term-prompt-label {
  color: #38bdf8;
  font-weight: bold;
}

.term-input {
  background: transparent;
  border: none;
  color: #f8fafc;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  flex: 1;
  outline: none;
}

.sim-hints-box {
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Sim 2: Hardware Assembly */
.hw-assembly-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 1.5rem;
}

.hw-bench-column, .hw-mobo-column {
  background: rgba(11, 19, 43, 0.4);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 1rem;
}

.hw-bench-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1rem;
}

.hw-part-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.8rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: grab;
  transition: var(--transition);
}

.hw-part-card.placed {
  opacity: 0.4;
  cursor: not-allowed;
}

.hw-slots-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1rem;
}

.hw-slot-zone {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.8rem;
  transition: var(--transition);
}

.hw-slot-zone.drag-over {
  border-color: var(--accent-cyan);
  background: rgba(0, 180, 216, 0.1);
}

.slot-dropzone.occupied {
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid var(--color-success);
  padding: 0.5rem;
  border-radius: var(--radius-sm);
}

.installed-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--color-success);
  font-weight: 600;
}

.btn-remove-part {
  background: transparent;
  border: none;
  color: var(--color-danger);
  font-size: 1.2rem;
  cursor: pointer;
}

/* Sim 3: Router GUI */
.router-gui-container {
  background: #0f172a;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.router-navbar {
  background: #1e293b;
  padding: 0.75rem 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.router-tabs {
  display: flex;
  gap: 0.5rem;
}

.router-tab {
  background: transparent;
  border: none;
  color: #94a3b8;
  padding: 0.4rem 0.8rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.85rem;
}

.router-tab.active {
  background: var(--accent-cyan);
  color: #0f172a;
  font-weight: bold;
}

.router-content {
  padding: 1.5rem;
}

.router-input, .router-select {
  width: 100%;
  padding: 0.6rem;
  background: #090d16;
  border: 1px solid #334155;
  border-radius: 4px;
  color: #f8fafc;
}

.router-actions {
  margin-top: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.status-saved {
  color: var(--color-success);
  font-weight: 600;
  font-size: 0.9rem;
}

/* Sim 4: RAID Builder */
.raid-builder-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.range-slider-kable {
  width: 100%;
  accent-color: var(--accent-cyan);
}

.slider-val-badge {
  background: rgba(0, 180, 216, 0.15);
  color: var(--accent-cyan);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-top: 0.4rem;
  display: inline-block;
}

.disks-flex {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 1rem 0;
}

.disk-card {
  background: rgba(11, 19, 43, 0.8);
  border: 1px solid var(--border-color);
  padding: 0.75rem;
  border-radius: var(--radius-sm);
  text-align: center;
  flex: 1;
  min-width: 80px;
}

.disk-icon {
  font-size: 1.5rem;
  color: var(--accent-cyan);
  margin-bottom: 0.25rem;
}

.raid-stats-summary {
  background: rgba(255, 255, 255, 0.05);
  padding: 0.8rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

/* Sim 5: SQL Workbench */
.sql-workbench-box {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 1rem;
  background: #090d16;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 1rem;
}

.sql-schema-sidebar {
  border-right: 1px solid var(--border-color);
  padding-right: 1rem;
}

.schema-table-item {
  font-size: 0.8rem;
  margin-top: 0.75rem;
  background: rgba(255, 255, 255, 0.03);
  padding: 0.5rem;
  border-radius: 4px;
}

.schema-table-item ul {
  list-style: none;
  padding-left: 0.5rem;
  color: var(--text-muted);
}

.sql-textarea {
  width: 100%;
  background: #0f172a;
  border: 1px solid #334155;
  color: #38bdf8;
  font-family: var(--font-mono);
  padding: 0.75rem;
  border-radius: 4px;
  resize: vertical;
  margin: 0.5rem 0 1rem 0;
}

.sql-output-console {
  background: #040711;
  border: 1px solid #1e293b;
  padding: 0.75rem;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  min-height: 100px;
}

.log-entry.success { color: #4ade80; }
.log-entry.error { color: #f87171; }

/* Modals */
.modal-backdrop {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(6px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal-backdrop.active {
  display: flex;
}

.modal-card-kable {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  width: 90%;
  max-width: 780px;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: var(--shadow-soft);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.modal-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Results Screen */
.results-hero-card {
  text-align: center;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 3rem 2rem;
  margin-bottom: 2rem;
}

.score-circle {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  border: 6px solid var(--accent-cyan);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 1.5rem auto;
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--accent-cyan);
  box-shadow: var(--shadow-glow);
}

.score-circle.pass {
  border-color: var(--color-success);
  color: var(--color-success);
}

.score-circle.fail {
  border-color: var(--color-danger);
  color: var(--color-danger);
}