/* ============================================================
   Skoolyst MCQs — Design System
   Colors: Dark Navy #0A0E2A, Skoolyst Navy #0F4077, Cyan accent,
           Gold/Amber for CTA highlights
   ============================================================ */

:root {
  --sk-dark-navy: #0A0E2A;
  --sk-navy: #0F4077;
  --sk-navy-light: #1a5a9e;
  --sk-navy-dark: #0a2e57;
  --sk-cyan: #00B8D4;
  --sk-cyan-light: #5BD6E8;
  --sk-cyan-dark: #0097B0;
  --sk-gold: #F5A623;
  --sk-gold-light: #F8C257;
  --sk-gold-dark: #D4881A;

  --sk-white: #FFFFFF;
  --sk-bg: #F5F7FA;
  --sk-bg-alt: #EDF1F7;
  --sk-card: #FFFFFF;
  --sk-border: #E2E8F0;
  --sk-border-dark: #CBD5E1;

  --sk-text: #1E293B;
  --sk-text-secondary: #64748B;
  --sk-text-muted: #94A3B8;
  --sk-text-light: #CBD5E1;

  --sk-success: #16A34A;
  --sk-success-bg: #DCFCE7;
  --sk-warning: #F59E0B;
  --sk-warning-bg: #FEF3C7;
  --sk-error: #DC2626;
  --sk-error-bg: #FEE2E2;
  --sk-info: #0EA5E9;
  --sk-info-bg: #E0F2FE;

  --sk-radius: 10px;
  --sk-radius-sm: 6px;
  --sk-radius-lg: 16px;
  --sk-shadow-sm: 0 1px 2px rgba(10, 14, 42, 0.05);
  --sk-shadow: 0 2px 8px rgba(10, 14, 42, 0.08);
  --sk-shadow-md: 0 4px 16px rgba(10, 14, 42, 0.10);
  --sk-shadow-lg: 0 8px 32px rgba(10, 14, 42, 0.14);

  --sk-font: 'Segoe UI', system-ui, -apple-system, Roboto, 'Helvetica Neue', Arial, sans-serif;
  --sk-transition: 0.2s ease;
}

/* ---------- Base ---------- */
* { box-sizing: border-box; }

body {
  font-family: var(--sk-font);
  color: var(--sk-text);
  background-color: var(--sk-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  color: var(--sk-dark-navy);
  line-height: 1.25;
}

a { text-decoration: none; transition: color var(--sk-transition); }
a:hover { color: var(--sk-navy); }

.text-cyan { color: var(--sk-cyan) !important; }
.text-gold { color: var(--sk-gold) !important; }
.text-navy { color: var(--sk-navy) !important; }
.text-dark-navy { color: var(--sk-dark-navy) !important; }
.text-secondary-custom { color: var(--sk-text-secondary) !important; }

.bg-navy { background-color: var(--sk-navy) !important; }
.bg-dark-navy { background-color: var(--sk-dark-navy) !important; }
.bg-cyan { background-color: var(--sk-cyan) !important; }
.bg-gold { background-color: var(--sk-gold) !important; }
.bg-soft { background-color: var(--sk-bg-alt) !important; }

/* ---------- Buttons ---------- */
.btn-sk-navy {
  background-color: var(--sk-navy);
  color: var(--sk-white);
  border: none;
  font-weight: 600;
  padding: 0.55rem 1.4rem;
  border-radius: var(--sk-radius-sm);
  transition: all var(--sk-transition);
}
.btn-sk-navy:hover { background-color: var(--sk-navy-dark); color: var(--sk-white); }

.btn-sk-cyan {
  background-color: var(--sk-cyan);
  color: var(--sk-white);
  border: none;
  font-weight: 600;
  padding: 0.55rem 1.4rem;
  border-radius: var(--sk-radius-sm);
  transition: all var(--sk-transition);
}
.btn-sk-cyan:hover { background-color: var(--sk-cyan-dark); color: var(--sk-white); }

.btn-sk-gold {
  background-color: var(--sk-gold);
  color: var(--sk-dark-navy);
  border: none;
  font-weight: 700;
  padding: 0.55rem 1.4rem;
  border-radius: var(--sk-radius-sm);
  transition: all var(--sk-transition);
}
.btn-sk-gold:hover { background-color: var(--sk-gold-dark); color: var(--sk-white); }

.btn-sk-outline {
  background-color: transparent;
  color: var(--sk-navy);
  border: 2px solid var(--sk-navy);
  font-weight: 600;
  padding: 0.45rem 1.4rem;
  border-radius: var(--sk-radius-sm);
  transition: all var(--sk-transition);
}
.btn-sk-outline:hover { background-color: var(--sk-navy); color: var(--sk-white); }

.btn-sk-outline-light {
  background-color: transparent;
  color: var(--sk-white);
  border: 2px solid rgba(255,255,255,0.5);
  font-weight: 600;
  padding: 0.45rem 1.4rem;
  border-radius: var(--sk-radius-sm);
  transition: all var(--sk-transition);
}
.btn-sk-outline-light:hover { background-color: rgba(255,255,255,0.1); color: var(--sk-white); border-color: var(--sk-white); }

.btn-sk-light {
  background-color: var(--sk-bg-alt);
  color: var(--sk-text);
  border: 1px solid var(--sk-border);
  font-weight: 600;
  padding: 0.5rem 1.2rem;
  border-radius: var(--sk-radius-sm);
  transition: all var(--sk-transition);
}
.btn-sk-light:hover { background-color: var(--sk-border); }

.btn-sm-sk {
  padding: 0.3rem 0.85rem;
  font-size: 0.85rem;
  border-radius: var(--sk-radius-sm);
}

/* ---------- Navbar ---------- */
.sk-navbar {
  background-color: var(--sk-white);
  border-bottom: 1px solid var(--sk-border);
  box-shadow: var(--sk-shadow-sm);
  padding: 0.6rem 0;
  position: sticky;
  top: 0;
  z-index: 1030;
}
.sk-navbar .navbar-brand {
  font-weight: 800;
  font-size: 1.4rem;
  color: var(--sk-navy);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.sk-navbar .navbar-brand .sk-logo-mark {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--sk-navy), var(--sk-cyan));
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--sk-white);
  font-weight: 800;
  font-size: 1.1rem;
}
.sk-navbar .navbar-brand .sk-logo-text span { color: var(--sk-cyan); }
.sk-navbar .nav-link {
  color: var(--sk-text-secondary);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.4rem 0.85rem !important;
  border-radius: var(--sk-radius-sm);
  transition: all var(--sk-transition);
}
.sk-navbar .nav-link:hover,
.sk-navbar .nav-link.active {
  color: var(--sk-navy);
  background-color: var(--sk-bg-alt);
}
.sk-navbar .nav-link.active { color: var(--sk-navy); }
.sk-navbar .sk-search-box {
  border: 1px solid var(--sk-border);
  border-radius: 20px;
  padding: 0.3rem 0.9rem;
  font-size: 0.85rem;
  width: 200px;
  outline: none;
  transition: border-color var(--sk-transition);
}
.sk-navbar .sk-search-box:focus { border-color: var(--sk-cyan); }

/* ---------- Hero ---------- */
.sk-hero {
  background: linear-gradient(135deg, var(--sk-dark-navy) 0%, var(--sk-navy) 60%, var(--sk-navy-dark) 100%);
  color: var(--sk-white);
  padding: 4.5rem 0 4rem;
  position: relative;
  overflow: hidden;
}
.sk-hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(0,184,212,0.12) 0%, transparent 70%);
  border-radius: 50%;
}
.sk-hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -5%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(245,166,35,0.08) 0%, transparent 70%);
  border-radius: 50%;
}
.sk-hero h1 {
  color: var(--sk-white);
  font-size: 2.8rem;
  font-weight: 800;
  margin-bottom: 1rem;
}
.sk-hero .sk-hero-tagline {
  color: var(--sk-cyan-light);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}
.sk-hero p { color: rgba(255,255,255,0.85); font-size: 1.15rem; max-width: 600px; }
.sk-hero .sk-hero-cta { display: flex; gap: 0.75rem; flex-wrap: wrap; margin-top: 1.5rem; }

/* ---------- Section ---------- */
.sk-section { padding: 3.5rem 0; }
.sk-section-title {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--sk-dark-navy);
  margin-bottom: 0.4rem;
}
.sk-section-subtitle { color: var(--sk-text-secondary); margin-bottom: 2rem; }

/* ---------- Cards ---------- */
.sk-card {
  background-color: var(--sk-card);
  border: 1px solid var(--sk-border);
  border-radius: var(--sk-radius);
  padding: 1.5rem;
  transition: box-shadow var(--sk-transition), transform var(--sk-transition);
  display: flex;
  flex-direction: column;
}
.sk-card-grid > .sk-card {
  height: 100%;
}
.sk-card > .btn {
  margin-top: auto;
}
.sk-card:hover {
  box-shadow: var(--sk-shadow-md);
  transform: translateY(-2px);
}
.sk-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}
.sk-card-icon {
  width: 52px;
  height: 52px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1rem;
}
.sk-card-icon.bg-icon-navy { background-color: rgba(15,64,119,0.1); color: var(--sk-navy); }
.sk-card-icon.bg-icon-cyan { background-color: rgba(0,184,212,0.1); color: var(--sk-cyan-dark); }
.sk-card-icon.bg-icon-gold { background-color: rgba(245,166,35,0.1); color: var(--sk-gold-dark); }
.sk-card-icon.bg-icon-success { background-color: rgba(22,163,74,0.1); color: var(--sk-success); }
.sk-card-icon.bg-icon-error { background-color: rgba(220,38,38,0.1); color: var(--sk-error); }
.sk-card-icon.bg-icon-info { background-color: rgba(14,165,233,0.1); color: var(--sk-info); }

.sk-card-title { font-size: 1.15rem; font-weight: 700; margin-bottom: 0.4rem; }
.sk-card-text { color: var(--sk-text-secondary); font-size: 0.9rem; margin-bottom: 1rem; }
.sk-card-meta { display: flex; gap: 1rem; font-size: 0.82rem; color: var(--sk-text-muted); margin-bottom: 1rem; }
.sk-card-meta span { display: flex; align-items: center; gap: 0.25rem; }

/* ---------- Stat box ---------- */
.sk-stat {
  background-color: var(--sk-card);
  border: 1px solid var(--sk-border);
  border-radius: var(--sk-radius);
  padding: 1.5rem;
  text-align: center;
}
.sk-stat-number {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--sk-navy);
  line-height: 1;
}
.sk-stat-label { color: var(--sk-text-secondary); font-size: 0.9rem; margin-top: 0.3rem; }

/* ---------- Badges ---------- */
.sk-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.2rem 0.6rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
}
.sk-badge-easy { background-color: var(--sk-success-bg); color: var(--sk-success); }
.sk-badge-medium { background-color: var(--sk-warning-bg); color: #B45309; }
.sk-badge-hard { background-color: var(--sk-error-bg); color: var(--sk-error); }
.sk-badge-navy { background-color: rgba(15,64,119,0.1); color: var(--sk-navy); }
.sk-badge-cyan { background-color: rgba(0,184,212,0.1); color: var(--sk-cyan-dark); }
.sk-badge-gold { background-color: rgba(245,166,35,0.12); color: var(--sk-gold-dark); }
.sk-badge-light { background-color: var(--sk-bg-alt); color: var(--sk-text-secondary); }

/* ---------- Breadcrumb ---------- */
.sk-breadcrumb {
  background-color: var(--sk-bg-alt);
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--sk-border);
}
.sk-breadcrumb ol { margin: 0; }
.sk-breadcrumb a { color: var(--sk-text-secondary); font-size: 0.88rem; }
.sk-breadcrumb a:hover { color: var(--sk-navy); }
.sk-breadcrumb .active { color: var(--sk-text); font-weight: 600; font-size: 0.88rem; }

/* ---------- Page header (detail pages) ---------- */
.sk-page-header {
  background: linear-gradient(135deg, var(--sk-dark-navy) 0%, var(--sk-navy) 100%);
  color: var(--sk-white);
  padding: 2.5rem 0;
}
.sk-page-header h1 { color: var(--sk-white); margin-bottom: 0.5rem; }
.sk-page-header p { color: rgba(255,255,255,0.8); margin-bottom: 0; }

/* ---------- MCQ Option ---------- */
.sk-mcq-option {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  border: 2px solid var(--sk-border);
  border-radius: var(--sk-radius-sm);
  cursor: pointer;
  transition: all var(--sk-transition);
  background-color: var(--sk-white);
  margin-bottom: 0.6rem;
}
.sk-mcq-option:hover { border-color: var(--sk-cyan); background-color: #F0FBFD; }
.sk-mcq-option.selected { border-color: var(--sk-navy); background-color: #EBF4FA; }
.sk-mcq-option.correct { border-color: var(--sk-success); background-color: var(--sk-success-bg); }
.sk-mcq-option.incorrect { border-color: var(--sk-error); background-color: var(--sk-error-bg); }
.sk-mcq-option.disabled { cursor: not-allowed; opacity: 0.7; }
.sk-mcq-option-letter {
  width: 32px;
  height: 32px;
  min-width: 32px;
  border-radius: 50%;
  border: 2px solid var(--sk-border-dark);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--sk-text-secondary);
  transition: all var(--sk-transition);
}
.sk-mcq-option.selected .sk-mcq-option-letter { border-color: var(--sk-navy); background-color: var(--sk-navy); color: var(--sk-white); }
.sk-mcq-option.correct .sk-mcq-option-letter { border-color: var(--sk-success); background-color: var(--sk-success); color: var(--sk-white); }
.sk-mcq-option.incorrect .sk-mcq-option-letter { border-color: var(--sk-error); background-color: var(--sk-error); color: var(--sk-white); }
.sk-mcq-option-text { flex: 1; font-size: 0.95rem; }
.sk-mcq-option-icon { font-size: 1.2rem; }

/* ---------- Question palette ---------- */
.sk-palette-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(42px, 1fr));
  gap: 0.4rem;
}
.sk-palette-item {
  width: 42px;
  height: 42px;
  border-radius: 8px;
  border: 2px solid var(--sk-border);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--sk-transition);
  background-color: var(--sk-white);
  color: var(--sk-text-secondary);
}
.sk-palette-item:hover { border-color: var(--sk-cyan); }
.sk-palette-item.current { border-color: var(--sk-navy); background-color: var(--sk-navy); color: var(--sk-white); }
.sk-palette-item.answered { border-color: var(--sk-success); background-color: var(--sk-success-bg); color: var(--sk-success); }
.sk-palette-item.marked { border-color: var(--sk-gold); background-color: var(--sk-warning-bg); color: #B45309; }
.sk-palette-item.answered-marked { border-color: var(--sk-gold); background-color: #FEF3C7; color: #B45309; }

/* ---------- Progress bar ---------- */
.sk-progress {
  height: 8px;
  border-radius: 4px;
  background-color: var(--sk-bg-alt);
  overflow: hidden;
}
.sk-progress-bar {
  height: 100%;
  border-radius: 4px;
  background-color: var(--sk-navy);
  transition: width 0.4s ease;
}
.sk-progress-bar.bg-cyan { background-color: var(--sk-cyan); }
.sk-progress-bar.bg-gold { background-color: var(--sk-gold); }
.sk-progress-bar.bg-success { background-color: var(--sk-success); }
.sk-progress-bar.bg-error { background-color: var(--sk-error); }

/* ---------- Footer ---------- */
.sk-footer {
  background-color: var(--sk-dark-navy);
  color: rgba(255,255,255,0.7);
  padding: 3rem 0 1.5rem;
}
.sk-footer h5 { color: var(--sk-white); font-size: 1rem; margin-bottom: 1rem; }
.sk-footer a { color: rgba(255,255,255,0.65); font-size: 0.9rem; }
.sk-footer a:hover { color: var(--sk-cyan); }
.sk-footer .sk-footer-brand { color: var(--sk-white); font-weight: 800; font-size: 1.3rem; display: flex; align-items: center; gap: 0.5rem; margin-bottom: 1rem; }
.sk-footer .sk-footer-brand span { color: var(--sk-cyan); }
.sk-footer .sk-footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 1.5rem;
  margin-top: 2rem;
  font-size: 0.85rem;
}

/* ---------- Dashboard layout ---------- */
.sk-dash-wrapper { display: flex; min-height: 100vh; }
.sk-dash-sidebar {
  width: 250px;
  background-color: var(--sk-dark-navy);
  color: rgba(255,255,255,0.7);
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 1040;
  padding: 1.25rem 0;
  overflow-y: auto;
  transition: transform 0.3s ease;
}
.sk-dash-sidebar .sk-dash-brand {
  color: var(--sk-white);
  font-weight: 800;
  font-size: 1.25rem;
  padding: 0 1.25rem;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.sk-dash-sidebar .sk-dash-brand span { color: var(--sk-cyan); }
.sk-dash-sidebar .nav-link {
  color: rgba(255,255,255,0.7);
  padding: 0.7rem 1.25rem;
  font-size: 0.92rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.65rem;
  border-left: 3px solid transparent;
  transition: all var(--sk-transition);
}
.sk-dash-sidebar .nav-link:hover { color: var(--sk-white); background-color: rgba(255,255,255,0.05); }
.sk-dash-sidebar .nav-link.active {
  color: var(--sk-white);
  background-color: rgba(0,184,212,0.1);
  border-left-color: var(--sk-cyan);
}
.sk-dash-sidebar .nav-link i { font-size: 1.1rem; width: 22px; }
.sk-dash-sidebar .sk-dash-section-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: rgba(255,255,255,0.35);
  padding: 1rem 1.25rem 0.4rem;
  font-weight: 700;
}

.sk-dash-main {
  flex: 1;
  margin-left: 250px;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
.sk-dash-topbar {
  background-color: var(--sk-white);
  border-bottom: 1px solid var(--sk-border);
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 1030;
}
.sk-dash-topbar h1 { font-size: 1.25rem; margin: 0; }
.sk-dash-topbar .sk-dash-search {
  border: 1px solid var(--sk-border);
  border-radius: 20px;
  padding: 0.35rem 0.9rem;
  font-size: 0.85rem;
  width: 260px;
  outline: none;
}
.sk-dash-topbar .sk-dash-search:focus { border-color: var(--sk-cyan); }
.sk-dash-topbar .sk-dash-icon-btn {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: none;
  background-color: var(--sk-bg-alt);
  color: var(--sk-text-secondary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  position: relative;
  transition: all var(--sk-transition);
}
.sk-dash-topbar .sk-dash-icon-btn:hover { background-color: var(--sk-border); color: var(--sk-text); }
.sk-dash-topbar .sk-dash-icon-btn .sk-dot {
  position: absolute;
  top: 6px;
  right: 7px;
  width: 9px;
  height: 9px;
  background-color: var(--sk-error);
  border-radius: 50%;
  border: 2px solid var(--sk-white);
}
.sk-dash-content { padding: 1.5rem; flex: 1; }

.sk-dash-stat-card {
  background-color: var(--sk-white);
  border: 1px solid var(--sk-border);
  border-radius: var(--sk-radius);
  padding: 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}
.sk-dash-stat-card .sk-dash-stat-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
}
.sk-dash-stat-card .sk-dash-stat-number { font-size: 1.75rem; font-weight: 800; color: var(--sk-dark-navy); line-height: 1; }
.sk-dash-stat-card .sk-dash-stat-label { color: var(--sk-text-secondary); font-size: 0.85rem; }

.sk-dash-table {
  background-color: var(--sk-white);
  border: 1px solid var(--sk-border);
  border-radius: var(--sk-radius);
  overflow: hidden;
}
.sk-dash-table .table { margin: 0; }
.sk-dash-table .table thead th {
  background-color: var(--sk-bg-alt);
  border-bottom: 1px solid var(--sk-border);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--sk-text-secondary);
  font-weight: 700;
  padding: 0.75rem 1rem;
}
.sk-dash-table .table tbody td {
  padding: 0.75rem 1rem;
  font-size: 0.88rem;
  border-bottom: 1px solid var(--sk-border);
  vertical-align: middle;
}
.sk-dash-table .table tbody tr:last-child td { border-bottom: none; }

.sk-dash-quick-btn {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  border: 1px solid var(--sk-border);
  border-radius: var(--sk-radius);
  background-color: var(--sk-white);
  font-weight: 600;
  color: var(--sk-text);
  transition: all var(--sk-transition);
  cursor: pointer;
  width: 100%;
  text-align: left;
}
.sk-dash-quick-btn:hover { box-shadow: var(--sk-shadow); border-color: var(--sk-cyan); }
.sk-dash-quick-btn i { font-size: 1.3rem; }

.sk-activity-item {
  display: flex;
  gap: 0.75rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--sk-border);
}
.sk-activity-item:last-child { border-bottom: none; }
.sk-activity-icon {
  width: 36px;
  height: 36px;
  min-width: 36px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
}
.sk-activity-text { font-size: 0.85rem; }
.sk-activity-time { font-size: 0.78rem; color: var(--sk-text-muted); }

/* ---------- Mock test interface ---------- */
.sk-test-header {
  background-color: var(--sk-white);
  border-bottom: 1px solid var(--sk-border);
  padding: 0.75rem 1.5rem;
  position: sticky;
  top: 0;
  z-index: 1030;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.sk-timer {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--sk-navy);
  font-variant-numeric: tabular-nums;
}
.sk-timer.warning { color: var(--sk-warning); }
.sk-timer.danger { color: var(--sk-error); }

/* ---------- Result ring (CSS only) ---------- */
.sk-result-ring {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  margin: 0 auto;
  position: relative;
}
.sk-result-ring::before {
  content: '';
  position: absolute;
  inset: 12px;
  border-radius: 50%;
  background-color: var(--sk-white);
}
.sk-result-ring-content { position: relative; z-index: 1; text-align: center; }
.sk-result-ring-content .sk-result-percent { font-size: 2.2rem; font-weight: 800; color: var(--sk-dark-navy); line-height: 1; }
.sk-result-ring-content .sk-result-label { font-size: 0.8rem; color: var(--sk-text-secondary); }

/* ---------- Review item ---------- */
.sk-review-item {
  border: 1px solid var(--sk-border);
  border-radius: var(--sk-radius-sm);
  padding: 1rem 1.25rem;
  margin-bottom: 0.75rem;
  background-color: var(--sk-white);
}
.sk-review-item.correct { border-left: 4px solid var(--sk-success); }
.sk-review-item.incorrect { border-left: 4px solid var(--sk-error); }
.sk-review-item.unanswered { border-left: 4px solid var(--sk-text-muted); }

/* ---------- Filter chips ---------- */
.sk-filter-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.3rem 0.8rem;
  border-radius: 20px;
  border: 1px solid var(--sk-border);
  background-color: var(--sk-white);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--sk-text-secondary);
  cursor: pointer;
  transition: all var(--sk-transition);
}
.sk-filter-chip:hover { border-color: var(--sk-cyan); color: var(--sk-navy); }
.sk-filter-chip.active { background-color: var(--sk-navy); color: var(--sk-white); border-color: var(--sk-navy); }

/* ---------- Misc ---------- */
.sk-divider { height: 1px; background-color: var(--sk-border); margin: 1.5rem 0; border: none; }
.sk-list-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  border: 1px solid var(--sk-border);
  border-radius: var(--sk-radius-sm);
  margin-bottom: 0.5rem;
  background-color: var(--sk-white);
  transition: all var(--sk-transition);
}
.sk-list-item:hover { box-shadow: var(--sk-shadow-sm); border-color: var(--sk-border-dark); }

.sk-info-box {
  border: 1px solid var(--sk-border);
  border-radius: var(--sk-radius);
  padding: 1.25rem;
  background-color: var(--sk-white);
}
.sk-info-box h6 { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--sk-text-secondary); margin-bottom: 0.75rem; }
.sk-info-row { display: flex; justify-content: space-between; padding: 0.4rem 0; font-size: 0.9rem; border-bottom: 1px solid var(--sk-border); }
.sk-info-row:last-child { border-bottom: none; }
.sk-info-row .sk-info-label { color: var(--sk-text-secondary); }
.sk-info-row .sk-info-value { font-weight: 600; }

/* ---------- Responsive ---------- */
@media (max-width: 991.98px) {
  .sk-hero h1 { font-size: 2.2rem; }
  .sk-dash-sidebar { transform: translateX(-100%); }
  .sk-dash-sidebar.open { transform: translateX(0); }
  .sk-dash-main { margin-left: 0; }
  .sk-dash-topbar .sk-dash-search { width: 180px; }
}

@media (max-width: 767.98px) {
  .sk-hero { padding: 3rem 0 2.5rem; }
  .sk-hero h1 { font-size: 1.8rem; }
  .sk-hero p { font-size: 1rem; }
  .sk-section { padding: 2.5rem 0; }
  .sk-section-title { font-size: 1.4rem; }
  .sk-dash-topbar { padding: 0.6rem 1rem; }
  .sk-dash-topbar .sk-dash-search { display: none; }
  .sk-dash-content { padding: 1rem; }
}

@media (max-width: 575.98px) {
  .sk-hero h1 { font-size: 1.5rem; }
  .sk-hero .sk-hero-tagline { font-size: 0.85rem; }
  .sk-palette-grid { grid-template-columns: repeat(auto-fill, minmax(38px, 1fr)); }
}

/* ---------- Overlay for sidebar ---------- */
.sk-dash-overlay {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background-color: rgba(0,0,0,0.4);
  z-index: 1035;
}
.sk-dash-overlay.show { display: block; }

/* ---------- Toggle btn for sidebar ---------- */
.sk-dash-toggle {
  background: none;
  border: none;
  font-size: 1.4rem;
  color: var(--sk-text);
  cursor: pointer;
  padding: 0.25rem 0.5rem;
}

/* ---------- Empty state ---------- */
.sk-empty-state {
  text-align: center;
  padding: 3rem 1.5rem;
  color: var(--sk-text-secondary);
}
.sk-empty-state-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 1rem;
  border-radius: 50%;
  background-color: var(--sk-bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  color: var(--sk-text-muted);
}
.sk-empty-state h5 { color: var(--sk-text); margin-bottom: 0.35rem; }
.sk-empty-state p { margin-bottom: 0; font-size: 0.9rem; }

/* ---------- Auth ---------- */
.sk-auth-body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--sk-dark-navy), var(--sk-navy));
  padding: 2rem 1rem;
}
.sk-auth-card {
  width: 100%;
  max-width: 420px;
  background-color: var(--sk-card);
  border-radius: var(--sk-radius-lg);
  box-shadow: var(--sk-shadow-lg);
  padding: 2.25rem 2rem;
}
.sk-auth-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--sk-text);
  text-decoration: none;
  margin-bottom: 1.75rem;
}
.sk-auth-brand .sk-logo-mark {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--sk-navy), var(--sk-cyan));
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--sk-white);
  font-weight: 700;
  flex-shrink: 0;
}
.sk-auth-brand span { color: var(--sk-cyan); }
.sk-auth-title { font-size: 1.4rem; font-weight: 700; margin-bottom: 0.25rem; }
.sk-auth-subtitle { color: var(--sk-text-secondary); margin-bottom: 1.5rem; font-size: 0.92rem; }
.sk-auth-footer { text-align: center; margin-top: 1.5rem; font-size: 0.9rem; color: var(--sk-text-secondary); }
.sk-auth-footer a { color: var(--sk-navy); font-weight: 600; text-decoration: none; }
.sk-auth-footer a:hover { text-decoration: underline; }

/* ---------- Smart Search (Google-style) ---------- */
.sk-smart-search { position: relative; }
.sk-smart-search-box {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--sk-white);
  border: 1.5px solid var(--sk-border);
  border-radius: 999px;
  padding: 0.6rem 0.5rem 0.6rem 1.25rem;
  box-shadow: var(--sk-shadow);
  transition: box-shadow var(--sk-transition), border-color var(--sk-transition);
}
.sk-smart-search-box:focus-within {
  border-color: var(--sk-cyan);
  box-shadow: 0 0 0 4px rgba(0, 184, 212, 0.15), var(--sk-shadow-md);
}
.sk-smart-search-box .bi-search { font-size: 1.15rem; color: var(--sk-text-secondary); }
.sk-smart-search-input {
  flex: 1;
  border: none;
  outline: none;
  font-size: 1.05rem;
  background: transparent;
  color: var(--sk-text);
  min-width: 0;
}
.sk-smart-search-clear {
  border: none;
  background: transparent;
  color: var(--sk-text-muted);
  font-size: 1.1rem;
  padding: 0.2rem 0.4rem;
  line-height: 1;
  cursor: pointer;
  display: none;
}
.sk-smart-search-clear.show { display: inline-block; }
.sk-smart-search-submit {
  border: none;
  background: var(--sk-navy);
  color: var(--sk-white);
  border-radius: 999px;
  padding: 0.6rem 1.5rem;
  font-weight: 600;
  font-size: 0.95rem;
  transition: background var(--sk-transition);
  flex-shrink: 0;
}
.sk-smart-search-submit:hover { background: var(--sk-navy-dark); color: var(--sk-white); }

.sk-smart-search-dropdown {
  position: absolute;
  top: calc(100% + 10px);
  left: 0;
  right: 0;
  background: var(--sk-white);
  border-radius: var(--sk-radius-lg);
  box-shadow: var(--sk-shadow-lg);
  border: 1px solid var(--sk-border);
  z-index: 50;
  max-height: 420px;
  overflow-y: auto;
  padding: 0.5rem;
  display: none;
  text-align: left;
}
.sk-smart-search-dropdown.show { display: block; }
.sk-smart-search-group-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--sk-text-muted);
  padding: 0.6rem 0.75rem 0.3rem;
}
.sk-smart-search-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 0.75rem;
  border-radius: var(--sk-radius-sm);
  cursor: pointer;
  color: var(--sk-text);
  text-decoration: none;
}
.sk-smart-search-item:hover,
.sk-smart-search-item.active {
  background: var(--sk-bg-alt);
  color: var(--sk-text);
}
.sk-smart-search-item-icon {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--sk-bg-alt);
  color: var(--sk-navy);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1rem;
}
.sk-smart-search-item.active .sk-smart-search-item-icon { background: var(--sk-cyan); color: var(--sk-white); }
.sk-smart-search-item-title { font-weight: 600; font-size: 0.92rem; line-height: 1.3; }
.sk-smart-search-item-meta { font-size: 0.78rem; color: var(--sk-text-secondary); }
.sk-smart-search-item mark { background: rgba(0, 184, 212, 0.25); color: inherit; border-radius: 3px; padding: 0 1px; }
.sk-smart-search-empty, .sk-smart-search-loading {
  padding: 1.25rem 0.75rem;
  text-align: center;
  color: var(--sk-text-secondary);
  font-size: 0.9rem;
}
.sk-smart-search-footer {
  border-top: 1px solid var(--sk-border);
  margin-top: 0.4rem;
  padding: 0.6rem 0.75rem 0.3rem;
}
.sk-smart-search-footer a { font-size: 0.88rem; font-weight: 600; color: var(--sk-navy); }
.sk-auth-label { font-weight: 600; font-size: 0.9rem; margin-bottom: 0.35rem; }