:root {
  /* Professional Navy, Clean White, Energetic Orange CTA */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --navy-dark: #0f172a;
  --navy-main: #1e293b;
  --navy-light: #334155;
  --white: #ffffff;

  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-inverse: #ffffff;

  --accent-orange: #f97316;
  --accent-orange-hover: #ea580c;

  --success-green: #10b981;
  --error-red: #ef4444;
  --disabled-bg: #e2e8f0;
  --border-color: #e2e8f0;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.15);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  font-family:
    "Inter",
    system-ui,
    -apple-system,
    sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-main);
  overflow: hidden;
}
.hidden {
  display: none !important;
}
.app-container {
  display: flex;
  height: 100vh;
  width: 100vw;
}

/* Sidebar */
.sidebar {
  width: 280px;
  background-color: var(--navy-dark);
  color: var(--white);
  display: flex;
  flex-direction: column;
  transition: transform 0.3s ease;
  z-index: 100;
  flex-shrink: 0;
}
.sidebar-logo {
  padding: 32px 24px;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 22px;
  font-weight: 700;
}
.logo-icon {
  color: var(--accent-orange);
}
.nav-menu {
  flex: 1;
  padding: 0 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  background: transparent;
  border: none;
  color: #94a3b8;
  font-size: 15px;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: left;
}
.nav-item:hover {
  background-color: rgba(255, 255, 255, 0.05);
  color: var(--white);
}
.nav-item.active {
  background-color: rgba(249, 115, 22, 0.1);
  color: var(--accent-orange);
}
.sidebar-footer {
  padding: 24px;
  background-color: rgba(0, 0, 0, 0.2);
}
.user-profile {
  display: flex;
  align-items: center;
  gap: 12px;
}
.avatar {
  width: 40px;
  height: 40px;
  background-color: var(--accent-orange);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--white);
}
.user-details {
  display: flex;
  flex-direction: column;
}
.user-name {
  font-weight: 700;
  font-size: 14px;
  color: var(--accent-orange);
  margin-bottom: 2px;
}
.user-tier {
  font-size: 12px;
  color: #e2e8f0;
}

/* Main Content Wrapper */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-primary);
  overflow: hidden;
  position: relative;
}

/* General Topbar */
.topbar {
  height: 80px;
  padding: 0 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}
.header-title h1 {
  font-size: 20px;
  font-weight: 700;
}
.header-title p {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 4px;
}
.mobile-menu-btn {
  display: none;
  cursor: pointer;
  color: var(--navy-dark);
  margin-right: 16px;
}
.header-stats {
  display: flex;
  gap: 16px;
  margin-left: auto;
}
.xp-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  background-color: rgba(0, 122, 255, 0.1);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 14px;
  color: #007aff;
}
.stat-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 14px;
}

/* Catalog View */
.catalog-container {
  flex: 1;
  overflow-y: auto;
  padding: 40px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
  align-content: start;
}
.subject-card {
  background-color: var(--bg-secondary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  padding: 24px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}
.subject-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  border-color: var(--text-muted);
}
.subject-card.locked {
  background-color: #f1f5f9;
  cursor: pointer;
}
.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 12px;
}
.subject-index {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--accent-orange);
  letter-spacing: 0.5px;
}
.subject-card.locked .subject-index {
  color: var(--text-muted);
}
.icon-box {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background-color: rgba(249, 115, 22, 0.1);
  color: var(--accent-orange);
  display: flex;
  align-items: center;
  justify-content: center;
}
.subject-card.locked .icon-box {
  background-color: var(--border-color);
  color: var(--text-muted);
}
.subject-card.completed .icon-box {
  background-color: rgba(16, 185, 129, 0.1);
  color: var(--success-green);
}
.card-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--navy-dark);
}
.card-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 24px;
  flex: 1;
}
.card-progress {
  margin-top: auto;
}
.progress-header {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 8px;
}
.progress-bar-bg {
  height: 6px;
  background-color: var(--disabled-bg);
  border-radius: 3px;
  overflow: hidden;
}
.progress-bar-fill {
  height: 100%;
  background-color: var(--accent-orange);
  transition: width 0.4s ease;
}
.subject-card.completed .progress-bar-fill {
  background-color: var(--success-green);
}

/* Course Drill-Down */
.course-view {
  flex: 1;
  overflow-y: auto;
  padding: 40px;
  max-width: 900px;
  margin: 0 auto;
  width: 100%;
}
.course-view-header {
  margin-bottom: 32px;
}
.course-title-flex {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 16px;
}
.course-view-title {
  font-size: 28px;
  font-weight: 800;
  color: var(--navy-dark);
  margin-bottom: 8px;
}
.course-view-desc {
  font-size: 15px;
  color: var(--text-muted);
  font-weight: 500;
}
.course-progress-text {
  font-size: 14px;
  font-weight: 700;
  color: var(--accent-orange);
}
.course-lessons-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* Lesson Row */
.lesson-row {
  display: flex;
  align-items: center;
  padding: 20px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  transition: all 0.2s ease;
}
.lesson-row.locked {
  background-color: transparent;
  opacity: 0.6;
  pointer-events: none;
}
.lesson-row.completed {
  border-color: var(--success-green);
  background-color: rgba(16, 185, 129, 0.02);
}
.lesson-row.active-tier {
  border-color: var(--accent-orange);
  box-shadow: 0 0 0 1px var(--accent-orange);
}
.lesson-row.start-here {
  border-color: var(--accent-orange);
  box-shadow: 0 0 0 1px var(--accent-orange);
}
.lesson-row-index {
  width: 50px;
  font-weight: 700;
  color: var(--text-muted);
  font-size: 16px;
}
.lesson-row-body {
  flex: 1;
}
.lesson-row-title {
  display: block;
  font-weight: 600;
  color: var(--text-main);
  font-size: 16px;
  margin-bottom: 4px;
}
.lesson-row-desc {
  display: block;
  font-size: 13px;
  color: var(--text-muted);
}
.lesson-action {
  margin-left: 16px;
}

/* Buttons */
.btn {
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  border: none;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: inherit;
}
.btn-icon {
  display: flex;
  align-items: center;
  justify-content: center;
}
.btn-secondary {
  background-color: transparent;
  color: var(--text-main);
  border: 1px solid var(--border-color);
}
.btn-secondary:hover {
  background-color: var(--border-color);
}
.btn-primary {
  background-color: var(--accent-orange);
  color: var(--white);
  box-shadow: var(--shadow-sm);
}
.btn-primary:not(:disabled):hover {
  background-color: var(--accent-orange-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}
.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
.btn-success {
  background-color: var(--success-green);
  color: var(--white);
}
.btn-success:hover {
  background-color: #059669;
}
#btn-back-catalog {
  margin-bottom: 24px;
}

.practice-hub-view,
.company-dashboard-view {
  flex: 1;
  overflow-y: auto;
  padding: 40px;
  max-width: 900px;
  margin: 0 auto;
  width: 100%;
}

/* Ledger Styles */
.ledger-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
}
.ledger-row.closed {
  border-color: var(--success-green);
  opacity: 0.7;
}
.je-modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}
.je-modal {
  background: var(--white);
  padding: 30px;
  border-radius: var(--radius-md);
  width: 400px;
  box-shadow: var(--shadow-lg);
}
.je-form-group {
  margin-bottom: 16px;
}
.je-form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
  font-size: 14px;
}
.je-form-group select,
.je-form-group input {
  width: 100%;
  padding: 10px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-family: inherit;
}

/* =========================================================
   NEW FULL-SCREEN LEARNING VIEW (REPLACING MODAL)
   ========================================================= */
.lesson-full-view {
  flex: 1;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-secondary);
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 50;
  overflow: hidden;
}

.lesson-header {
  height: 80px;
  padding: 0 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--white);
  flex-shrink: 0;
}

.lesson-header-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.lesson-tier-badge {
  display: inline-block;
  background-color: rgba(249, 115, 22, 0.1);
  color: var(--accent-orange);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
}

.lesson-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--navy-dark);
}

.lesson-progress-bar {
  padding: 24px 40px 0px 40px;
  background-color: var(--white);
}

.slide-indicator {
  display: flex;
  gap: 12px;
  max-width: 600px;
  margin: 0 auto;
}

.dot {
  height: 8px;
  flex: 1;
  background-color: var(--disabled-bg);
  border-radius: 4px;
  transition: background-color 0.3s;
}
.dot.active {
  background-color: var(--accent-orange);
}

.lesson-body-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 32px 40px;
  background-color: var(--white);
}

.lesson-body-content {
  max-width: 800px;
  margin: 0 auto;
  width: 100%;
}

.lesson-footer {
  padding: 24px 40px;
  background-color: var(--bg-primary);
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-shrink: 0;
}

/* Slide Content Formatting */
.slide {
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.slide-header {
  font-size: 24px;
  font-weight: 800;
  color: var(--navy-main);
  margin-bottom: 24px;
}
.slide-instruction {
  font-size: 16px;
  color: var(--text-muted);
  margin-bottom: 32px;
  font-weight: 500;
}
.slide-content {
  font-size: 16px;
  line-height: 1.7;
  color: var(--navy-dark);
}
.slide-content p {
  margin-bottom: 24px;
}
.slide-content strong {
  color: var(--navy-dark);
}
.slide-content .highlight-box {
  background-color: #f1f5f9;
  padding: 24px;
  border-radius: var(--radius-md);
  border-left: 5px solid var(--accent-orange);
  margin: 24px 0;
  color: var(--navy-main);
  font-size: 16px;
  font-weight: 500;
  font-family: inherit;
}

/* Alerts */
.alert-box {
  padding: 16px 20px;
  border-radius: var(--radius-sm);
  margin-bottom: 24px;
  border-left: 4px solid;
  display: flex;
  flex-direction: column;
}
.alert-box.error {
  background-color: #fef2f2;
  border-color: var(--error-red);
}
.alert-box.error strong {
  color: #b91c1c;
  display: block;
  margin-bottom: 4px;
  font-size: 15px;
}
.alert-box.error p {
  color: #991b1b;
  font-size: 14px;
  margin: 0;
}

/* Quiz Styles */
.quiz-question-block {
  margin-bottom: 40px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 32px;
}
.quiz-question-block:last-child {
  border-bottom: none;
}
.quiz-question-text {
  font-size: 18px;
  font-weight: 700;
  color: var(--navy-dark);
  margin-bottom: 16px;
}
.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.quiz-option {
  display: flex;
  align-items: flex-start;
  padding: 16px 20px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
  background: var(--bg-primary);
}
.quiz-option:hover {
  background-color: var(--bg-tertiary);
  border-color: var(--text-muted);
}
.quiz-option input[type="radio"] {
  margin-right: 16px;
  accent-color: var(--accent-orange);
  width: 20px;
  height: 20px;
  margin-top: 2px;
  flex-shrink: 0;
}
.quiz-option span {
  font-size: 16px;
  line-height: 1.5;
  font-weight: 500;
  color: var(--navy-main);
}
.quiz-option.selected {
  border-color: var(--accent-orange);
  background-color: rgba(249, 115, 22, 0.03);
  box-shadow: 0 0 0 1px var(--accent-orange);
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 12px;
  pointer-events: none;
}
.toast {
  background-color: var(--navy-dark);
  color: var(--white);
  padding: 16px 20px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  border-left: 4px solid var(--accent-orange);
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 300px;
  pointer-events: auto;
  animation: slideInRight 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.toast.hiding {
  animation: fadeOutRight 0.3s forwards;
}
.toast-header {
  display: flex;
  justify-content: space-between;
  align-items: start;
}
.toast-title {
  font-weight: 700;
  font-size: 15px;
  color: var(--white);
  margin-bottom: 4px;
}
.toast-desc {
  font-size: 13px;
  color: #cbd5e1;
  line-height: 1.4;
}
.toast-close {
  background: transparent;
  border: none;
  color: #94a3b8;
  cursor: pointer;
  display: flex;
  padding: 2px;
  border-radius: 4px;
}
.toast-close:hover {
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--white);
}
.toast-action {
  align-self: flex-start;
}

@keyframes slideInRight {
  from {
    transform: translateX(120%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}
@keyframes fadeOutRight {
  from {
    transform: translateX(0);
    opacity: 1;
  }
  to {
    transform: translateX(120%);
    opacity: 0;
  }
}

@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    height: 100%;
    transform: translateX(-100%);
  }
  .sidebar.mobile-open {
    transform: translateX(0);
  }
  .mobile-menu-btn {
    display: block;
  }
  .topbar,
  .lesson-header {
    padding: 0 20px;
  }
  .catalog-container,
  .course-view {
    padding: 20px;
  }
  .course-title-flex {
    flex-direction: column;
    align-items: flex-start;
  }
  .lesson-footer {
    padding: 20px;
  }
  .lesson-progress-bar,
  .lesson-body-scroll {
    padding-left: 20px;
    padding-right: 20px;
  }
}