/**
 * DP-600 Mastery Portal — Main Stylesheet
 * Coursera LMS design tokens, 2-pane master-detail layout, responsive drawer, dark/light theme definitions.
 */

:root {
  /* Coursera LMS Design System Tokens */
  --coursera-blue: #0056D2;
  --coursera-blue-hover: #00419E;
  --coursera-blue-light: #EBF3FF;
  --coursera-neutral: #F5F7FA;
  --coursera-card: #FFFFFF;
  --coursera-divider: #E2E8F0;
  --coursera-charcoal: #1F2937;
  --coursera-muted: #4B5563;
  --coursera-success: #1E8E3E;
  --coursera-warning: #B45309;
  --coursera-danger: #D93025;

  /* Theme Variables (Default Dark) */
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --bg-card: #1f2937;
  --bg-card-hover: #374151;
  --border-color: #374151;
  --border-color-light: #4b5563;
  
  --text-primary: #f9fafb;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;

  --accent-primary: #38bdf8;
  --accent-hover: #0284c7;
  --accent-light: rgba(2, 132, 199, 0.18);
  --accent-border: #38bdf8;
  --accent-text: #38bdf8;

  --success-bg: rgba(16, 185, 129, 0.15);
  --success-border: #10b981;
  --success-text: #34d399;

  --warning-bg: rgba(245, 158, 11, 0.15);
  --warning-border: #f59e0b;
  --warning-text: #fbbf24;

  --danger-bg: rgba(239, 68, 68, 0.15);
  --danger-border: #ef4444;
  --danger-text: #f87171;

  --domain-1-color: #0284c7;
  --domain-2-color: #10b981;
  --domain-3-color: #8b5cf6;
  --domain-4-color: #f59e0b;

  --font-main: 'Atkinson Hyperlegible', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-code: 'Fira Code', Consolas, Monaco, monospace;
  --border-radius-sm: 6px;
  --border-radius: 10px;
  --border-radius-lg: 16px;
  --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3), 0 8px 10px -6px rgba(0, 0, 0, 0.2);
}

/* Coursera Light Theme Variables (WCAG 2.1 AA Compliant) */
body.theme-light {
  --bg-primary: #F5F7FA;
  --bg-secondary: #FFFFFF;
  --bg-card: #FFFFFF;
  --bg-card-hover: #F0F4F8;
  --border-color: #E2E8F0;
  --border-color-light: #CBD5E1;
  --text-primary: #1F2937;
  --text-secondary: #374151;
  --text-muted: #4B5563;
  
  --accent-primary: #0056D2;
  --accent-hover: #00419E;
  --accent-light: #EBF3FF;
  --accent-border: #0056D2;
  --accent-text: #0056D2;

  --success-bg: #E6F4EA;
  --success-border: #1E8E3E;
  --success-text: #0E6228;

  --warning-bg: #FEF3C7;
  --warning-border: #D97706;
  --warning-text: #853800;

  --danger-bg: #FEE2E2;
  --danger-border: #DC2626;
  --danger-text: #B91C1C;

  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
}

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

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

/* ==========================================================================
   App Header (Coursera Style)
   ========================================================================== */

.app-header {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 1.5rem;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-container {
  max-width: 1600px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  flex-wrap: wrap;
}

.logo-badge {
  background: linear-gradient(135deg, #0056D2, #10b981);
  color: white;
  font-weight: 800;
  font-size: 1.15rem;
  padding: 0.4rem 0.75rem;
  border-radius: var(--border-radius-sm);
  box-shadow: 0 4px 10px rgba(0, 86, 210, 0.35);
  letter-spacing: 0.02em;
}

.portal-title h1 {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.portal-subtitle {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* Candidate Profile Chip */
.candidate-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  background: var(--accent-light);
  border: 1px solid var(--accent-border);
  padding: 0.2rem 0.6rem 0.2rem 0.35rem;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-primary);
}

.candidate-avatar {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--coursera-blue);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  font-weight: 800;
}

.candidate-name {
  color: var(--text-primary);
}

.server-status-pill {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.25rem 0.6rem;
  border-radius: 9999px;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  white-space: nowrap;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  transition: all 0.3s;
}

.server-status-pill.status-synced {
  background: var(--success-bg);
  border-color: var(--success-border);
  color: var(--success-text);
}

.server-status-pill.status-syncing {
  background: var(--warning-bg);
  border-color: var(--warning-border);
  color: var(--warning-text);
}

.server-status-pill.status-offline,
.server-status-pill.status-connecting {
  background: var(--bg-card);
  border-color: var(--border-color-light);
  color: var(--text-muted);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* Study Timer */
.study-timer-widget {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 0.3rem 0.65rem;
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.timer-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  font-weight: 600;
}

.timer-clock {
  font-family: var(--font-code);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--accent-text);
}

.btn-timer {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color-light);
  color: var(--text-primary);
  padding: 0.2rem 0.45rem;
  border-radius: var(--border-radius-sm);
  font-size: 0.75rem;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-timer:hover {
  background: var(--bg-card-hover);
}

.btn-timer.running {
  background: var(--warning-bg);
  border-color: var(--warning-border);
  color: var(--warning-text);
}

/* Header Controls */
.header-controls {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.theme-dropdown {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.35rem 0.55rem;
  border-radius: var(--border-radius-sm);
  font-size: 0.8rem;
  cursor: pointer;
}

.toggle-label {
  font-size: 0.78rem;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  cursor: pointer;
  color: var(--text-secondary);
}

.font-scale-group {
  display: flex;
  gap: 2px;
}

.btn-font-scale {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.2rem 0.4rem;
  font-size: 0.75rem;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
}

.btn-font-scale:hover {
  background: var(--bg-card-hover);
}

/* Data Portability Group */
.data-portability-group {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.btn-portability {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.35rem 0.55rem;
  border-radius: var(--border-radius-sm);
  font-size: 0.78rem;
  cursor: pointer;
  transition: all 0.2s;
}

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

.btn-sync-highlight {
  background: var(--coursera-blue);
  color: white;
  border-color: var(--coursera-blue);
}

.btn-sync-highlight:hover {
  background: var(--coursera-blue-hover);
  color: white;
}

/* ==========================================================================
   Navigation Bar
   ========================================================================== */

.app-nav {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 0 1.5rem;
  position: relative;
}

.nav-container {
  max-width: 1600px;
  margin: 0 auto;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  overflow-x: auto;
  scrollbar-width: thin;
  position: relative;
}

.nav-btn {
  background: transparent;
  border: none;
  border-bottom: 3px solid transparent;
  color: var(--text-secondary);
  font-size: 0.88rem;
  font-weight: 600;
  padding: 0.75rem 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: all 0.2s;
  white-space: nowrap;
}

.nav-btn:hover {
  color: var(--text-primary);
}

.nav-btn.active {
  color: var(--accent-text);
  border-bottom-color: var(--accent-primary);
}

.btn-sidebar-toggle {
  display: none;
  background: var(--accent-light);
  border: 1px solid var(--accent-border);
  color: var(--accent-text);
  font-weight: 700;
  font-size: 0.85rem;
  padding: 0.35rem 0.75rem;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s;
}

.btn-sidebar-toggle:hover {
  background: var(--accent-hover);
  color: #ffffff;
}

.btn-desktop-toggle {
  margin-left: 0.5rem;
}

.btn-sidebar-collapse {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.75rem;
  padding: 0.2rem 0.5rem;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: all 0.2s;
}

.btn-sidebar-collapse:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
  border-color: var(--accent-primary);
}

/* ==========================================================================
   LMS 2-Pane Master-Detail Layout
   ========================================================================== */

.lms-layout {
  display: flex;
  flex: 1;
  width: 100%;
  max-width: 1600px;
  margin: 0 auto;
  position: relative;
  min-height: calc(100vh - 120px);
}

/* Sidebar hidden when not on Syllabus tab or when collapsed on desktop */
.lms-layout.no-sidebar .lms-sidebar,
.lms-layout.sidebar-collapsed .lms-sidebar,
.lms-sidebar.hidden {
  display: none !important;
}

/* Left Syllabus Sidebar */
.lms-sidebar {
  width: 340px;
  min-width: 340px;
  max-width: 340px;
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  height: calc(100vh - 120px);
  position: sticky;
  top: 120px;
  overflow-y: auto;
  z-index: 50;
  transition: transform 0.3s ease;
}

.sidebar-header {
  padding: 1rem;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  position: sticky;
  top: 0;
  z-index: 10;
}

.sidebar-header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.sidebar-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
}

.sidebar-progress-badge {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-text);
}

.sidebar-progress-track {
  height: 6px;
  background: var(--bg-card);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 0.75rem;
}

.sidebar-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, #0056D2, #10b981);
  border-radius: 3px;
  transition: width 0.3s ease;
}

.sidebar-search-box {
  width: 100%;
}

.syllabus-search-field {
  width: 100%;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.45rem 0.75rem;
  border-radius: var(--border-radius-sm);
  font-size: 0.8rem;
  outline: none;
  transition: border-color 0.2s;
}

.syllabus-search-field:focus {
  border-color: var(--accent-primary);
}

/* Sidebar Accordion */
.sidebar-accordion {
  padding: 0.5rem 0;
  display: flex;
  flex-direction: column;
}

/* Main Content Stage */
.lms-stage {
  flex: 1;
  min-width: 0;
  padding: 1.5rem 2rem 3rem;
  background-color: var(--bg-primary);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.lms-stage .view-section {
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

/* Expanded full-width centering when sidebar is hidden/collapsed or on non-syllabus tabs */
.lms-layout.no-sidebar .lms-stage .view-section,
.lms-layout.sidebar-collapsed .lms-stage .view-section {
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
}

/* ==========================================================================
   Collapsible Executive Progress & Domain Cockpit
   ========================================================================== */

.kpi-cockpit-details {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  margin-bottom: 1.5rem;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.kpi-cockpit-summary {
  padding: 0.75rem 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  user-select: none;
  font-weight: 600;
  background: var(--bg-secondary);
  transition: background 0.2s;
}

.kpi-cockpit-summary:hover {
  background: var(--bg-card);
}

.kpi-summary-left {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.9rem;
}

.kpi-quick-pct {
  font-size: 0.78rem;
  background: var(--accent-light);
  color: var(--accent-text);
  border: 1px solid var(--accent-border);
  padding: 0.15rem 0.5rem;
  border-radius: 9999px;
  font-weight: 700;
}

.kpi-toggle-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.kpi-cockpit-content {
  padding: 1rem 1.25rem 1.25rem;
  border-top: 1px solid var(--border-color);
}

/* Executive KPI Dashboard */
.kpi-cockpit {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 1.25rem;
}

@media (max-width: 900px) {
  .kpi-cockpit {
    grid-template-columns: 1fr;
  }
}

.kpi-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 1.25rem;
}

.overall-progress-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.kpi-card-header h3 {
  font-size: 1rem;
  font-weight: 700;
}

.kpi-card-header p {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.overall-pct-display {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  margin: 0.75rem 0 0.25rem;
}

.pct-huge {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--accent-text);
  line-height: 1;
}

.pct-sub {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.progress-bar-container {
  height: 10px;
  background-color: var(--bg-secondary);
  border-radius: 5px;
  overflow: hidden;
  margin: 0.5rem 0;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #0056D2, #10b981);
  border-radius: 5px;
  transition: width 0.4s ease-out;
}

.overall-stats-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.4rem;
}

/* Domain Readiness Grid */
.domain-meters-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.75rem;
  margin-top: 0.75rem;
}

.domain-meter-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  padding: 0.75rem;
}

.dm-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 0.35rem;
}

.dm-name {
  font-size: 0.78rem;
  font-weight: 600;
  line-height: 1.3;
}

.dm-weight {
  font-size: 0.7rem;
  color: var(--text-muted);
}

.dm-bar-container {
  height: 6px;
  background: var(--bg-card);
  border-radius: 3px;
  overflow: hidden;
  margin: 0.3rem 0;
}

.dm-bar-fill {
  height: 100%;
  border-radius: 3px;
  transition: width 0.4s ease;
}

.fill-domain-1 { background-color: var(--domain-1-color); }
.fill-domain-2 { background-color: var(--domain-2-color); }
.fill-domain-3 { background-color: var(--domain-3-color); }
.fill-domain-4 { background-color: var(--domain-4-color); }

.dm-footer {
  display: flex;
  justify-content: flex-end;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-secondary);
}

/* Footer */
.app-footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 1.25rem 2rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: auto;
}

.footer-container {
  max-width: 1600px;
  margin: 0 auto;
}

.footer-links {
  margin-top: 0.4rem;
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--accent-text);
  text-decoration: none;
}

.footer-links a:hover {
  text-decoration: underline;
}

/* ==========================================================================
   Responsive Rules
   ========================================================================== */

@media (max-width: 991px) {
  .nav-container {
    justify-content: flex-start;
  }

  .btn-sidebar-toggle:not(.btn-desktop-toggle) {
    display: inline-flex;
    align-items: center;
    margin-left: auto;
  }

  .btn-desktop-toggle {
    display: none !important;
  }

  .btn-sidebar-collapse {
    display: none !important;
  }

  .lms-layout {
    max-width: 100%;
  }

  .lms-sidebar {
    position: fixed;
    top: 0;
    left: -340px;
    width: 320px;
    min-width: 320px;
    max-width: 320px;
    height: 100vh;
    z-index: 1100;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
  }

  .lms-sidebar.sidebar-open {
    left: 0;
  }

  .sidebar-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 1050;
    backdrop-filter: blur(3px);
  }

  .lms-stage {
    padding: 1rem 1rem 2.5rem;
  }
}

/* Helper Utilities */
.hidden { display: none !important; }
.text-success { color: var(--success-text) !important; }
.text-warning { color: var(--warning-text) !important; }
.text-danger { color: var(--danger-text) !important; }

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.55rem;
  border-radius: 9999px;
  font-size: 0.72rem;
  font-weight: 600;
}

.badge-primary { background: var(--accent-light); color: var(--accent-text); border: 1px solid var(--accent-border); }
.badge-success { background: var(--success-bg); color: var(--success-text); border: 1px solid var(--success-border); }
.badge-warning { background: var(--warning-bg); color: var(--warning-text); border: 1px solid var(--warning-border); }
.badge-danger { background: var(--danger-bg); color: var(--danger-text); border: 1px solid var(--danger-border); }