/* ===== CBT QUIZ SYSTEM — GLOBAL STYLES ===== */
@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;600;700;800&family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;1,9..40,300&display=swap');

:root {
  --bg:         #060b18;
  --bg2:        #0d1426;
  --bg3:        #0a1020;
  --card:       #111827;
  --card2:      #1a2234;
  --card-hover: #1e2840;
  --border:     #1e2d45;
  --border2:    #253555;
  --blue:       #3b82f6;
  --blue-dark:  #2563eb;
  --blue-light: #60a5fa;
  --cyan:       #06b6d4;
  --green:      #10b981;
  --red:        #ef4444;
  --orange:     #f97316;
  --yellow:     #f59e0b;
  --purple:     #8b5cf6;
  --text:       #f1f5f9;
  --text2:      #94a3b8;
  --text3:      #64748b;
  --shadow:     0 4px 24px rgba(0,0,0,.4);
  --shadow-lg:  0 8px 48px rgba(0,0,0,.6);
  --radius:     14px;
  --radius-sm:  8px;
  --radius-lg:  20px;
  --transition: .25s ease;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'DM Sans', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg2); }
::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--blue); }

/* ===== LAYOUT ===== */
.app-layout {
  display: flex;
  min-height: 100vh;
}

/* ===== SIDEBAR ===== */
.sidebar {
  width: 260px;
  min-height: 100vh;
  background: var(--bg2);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: fixed;
  left: 0; top: 0; bottom: 0;
  z-index: 100;
  transition: transform var(--transition);
}

.sidebar-brand {
  padding: 24px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 12px;
}
.sidebar-icon {
  width: 44px; height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  display: grid; place-items: center;
  font-size: 20px;
  box-shadow: 0 0 20px rgba(59,130,246,.3);
  flex-shrink: 0;
}
.sidebar-brand-text { font-family: 'Syne', sans-serif; font-weight: 700; font-size: 16px; }
.sidebar-brand-text small { display: block; font-family: 'DM Sans', sans-serif; font-weight: 400; font-size: 11px; color: var(--text3); }

.sidebar-nav {
  flex: 1;
  padding: 16px 12px;
  overflow-y: auto;
}
.nav-section-label {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--text3);
  padding: 8px 8px 4px;
  margin-top: 8px;
}
.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 12px;
  border-radius: 10px;
  text-decoration: none;
  color: var(--text2);
  font-size: 14px;
  font-weight: 500;
  transition: all var(--transition);
  margin-bottom: 2px;
  position: relative;
}
.nav-item:hover {
  background: rgba(59,130,246,.08);
  color: var(--text);
}
.nav-item.active {
  background: rgba(59,130,246,.15);
  color: var(--blue-light);
  border: 1px solid rgba(59,130,246,.2);
}
.nav-item.active::before {
  content: '';
  position: absolute;
  left: 0; top: 50%;
  transform: translateY(-50%);
  width: 3px; height: 60%;
  background: var(--blue);
  border-radius: 0 3px 3px 0;
}
.nav-icon { font-size: 17px; flex-shrink: 0; }
.nav-badge {
  margin-left: auto;
  background: var(--blue);
  color: #fff;
  font-size: 10px;
  padding: 2px 7px;
  border-radius: 20px;
  font-weight: 600;
}

.sidebar-footer {
  padding: 16px 12px;
  border-top: 1px solid var(--border);
}
.sidebar-user {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 10px;
  background: rgba(255,255,255,.03);
  margin-bottom: 8px;
}
.user-avatar {
  width: 36px; height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--blue), var(--purple));
  display: grid; place-items: center;
  font-size: 14px; font-weight: 700;
  flex-shrink: 0;
}
.user-info-name  { font-size: 13px; font-weight: 600; }
.user-info-role  { font-size: 11px; color: var(--text3); }
.logout-btn {
  display: flex; align-items: center; gap: 10px;
  width: 100%; padding: 10px 12px;
  border-radius: 10px; border: none; cursor: pointer;
  background: rgba(239,68,68,.08); color: #fca5a5;
  font-size: 13px; font-weight: 500;
  font-family: 'DM Sans', sans-serif;
  text-decoration: none;
  transition: background var(--transition);
}
.logout-btn:hover { background: rgba(239,68,68,.15); }

/* ===== MAIN CONTENT ===== */
.main-content {
  flex: 1;
  margin-left: 260px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ===== TOPBAR ===== */
.topbar {
  height: 64px;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  position: sticky;
  top: 0;
  z-index: 90;
}
.topbar-left { display: flex; align-items: center; gap: 16px; }
.topbar-title { font-family: 'Syne', sans-serif; font-size: 18px; font-weight: 700; }
.topbar-subtitle { font-size: 13px; color: var(--text3); }
.topbar-right { display: flex; align-items: center; gap: 12px; }
.topbar-btn {
  width: 38px; height: 38px; border-radius: 10px;
  border: 1px solid var(--border); background: rgba(255,255,255,.03);
  display: grid; place-items: center; cursor: pointer;
  font-size: 17px; transition: all var(--transition); color: var(--text2);
  text-decoration: none;
}
.topbar-btn:hover { background: rgba(59,130,246,.1); border-color: var(--blue); color: var(--text); }
.hamburger { display: none; }
@media(max-width:768px){ .hamburger { display: grid; } }

/* ===== PAGE BODY ===== */
.page-body { flex: 1; padding: 28px; }
.page-header { margin-bottom: 24px; }
.page-header h1 { font-family: 'Syne', sans-serif; font-size: 24px; font-weight: 700; margin-bottom: 4px; }
.page-header p  { font-size: 14px; color: var(--text2); }
.page-header-row { display: flex; align-items: flex-start; justify-content: space-between; flex-wrap: wrap; gap: 12px; margin-bottom: 24px; }

/* ===== STAT CARDS ===== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px,1fr));
  gap: 16px;
  margin-bottom: 28px;
}
.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: border-color var(--transition), transform var(--transition);
  cursor: default;
}
.stat-card:hover { border-color: var(--border2); transform: translateY(-2px); }
.stat-icon {
  width: 52px; height: 52px; border-radius: 12px;
  display: grid; place-items: center; font-size: 22px; flex-shrink: 0;
}
.stat-icon.blue   { background: rgba(59,130,246,.15); }
.stat-icon.green  { background: rgba(16,185,129,.15); }
.stat-icon.yellow { background: rgba(245,158,11,.15); }
.stat-icon.red    { background: rgba(239,68,68,.15); }
.stat-icon.cyan   { background: rgba(6,182,212,.15); }
.stat-icon.purple { background: rgba(139,92,246,.15); }
.stat-icon.orange { background: rgba(249,115,22,.15); }
.stat-val   { font-family: 'Syne', sans-serif; font-size: 26px; font-weight: 700; line-height: 1; }
.stat-label { font-size: 13px; color: var(--text2); margin-top: 4px; }
.stat-trend { font-size: 12px; margin-top: 2px; }
.stat-trend.up   { color: var(--green); }
.stat-trend.down { color: var(--red); }

/* ===== CARDS ===== */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.card-header {
  padding: 18px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}
.card-title { font-family: 'Syne', sans-serif; font-size: 15px; font-weight: 700; }
.card-body  { padding: 20px; }

/* ===== TABLES ===== */
.table-wrap { overflow-x: auto; }
table {
  width: 100%; border-collapse: collapse;
  font-size: 14px;
}
thead th {
  padding: 12px 14px;
  text-align: left;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--text3);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
tbody td {
  padding: 13px 14px;
  border-bottom: 1px solid rgba(30,45,69,.5);
  vertical-align: middle;
}
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover td { background: rgba(255,255,255,.02); }

/* ===== BADGES ===== */
.badge {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 4px 10px; border-radius: 20px;
  font-size: 11px; font-weight: 600; letter-spacing: .03em;
}
.badge-blue   { background: rgba(59,130,246,.15);  color: #60a5fa; }
.badge-green  { background: rgba(16,185,129,.15);  color: #34d399; }
.badge-red    { background: rgba(239,68,68,.15);   color: #fca5a5; }
.badge-yellow { background: rgba(245,158,11,.15);  color: #fcd34d; }
.badge-gray   { background: rgba(100,116,139,.15); color: #94a3b8; }
.badge-cyan   { background: rgba(6,182,212,.15);   color: #22d3ee; }
.badge-purple { background: rgba(139,92,246,.15);  color: #a78bfa; }
.badge-orange { background: rgba(249,115,22,.15);  color: #fb923c; }

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 10px 18px; border-radius: 9px; border: none;
  cursor: pointer; font-size: 14px; font-weight: 500;
  font-family: 'DM Sans', sans-serif;
  text-decoration: none; transition: all var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--blue), var(--blue-dark));
  color: #fff; box-shadow: 0 2px 12px rgba(59,130,246,.3);
}
.btn-primary:hover { box-shadow: 0 4px 20px rgba(59,130,246,.4); transform: translateY(-1px); }
.btn-secondary {
  background: rgba(255,255,255,.06); border: 1px solid var(--border);
  color: var(--text2);
}
.btn-secondary:hover { background: rgba(255,255,255,.1); color: var(--text); }
.btn-danger { background: rgba(239,68,68,.1); border: 1px solid rgba(239,68,68,.2); color: #fca5a5; }
.btn-danger:hover { background: rgba(239,68,68,.2); }
.btn-success { background: rgba(16,185,129,.1); border: 1px solid rgba(16,185,129,.2); color: #34d399; }
.btn-success:hover { background: rgba(16,185,129,.2); }
.btn-sm { padding: 7px 12px; font-size: 13px; }
.btn-lg { padding: 13px 24px; font-size: 15px; }
.btn-icon { padding: 9px; }
.btn:disabled { opacity: .5; cursor: not-allowed; transform: none !important; }

/* ===== FORMS ===== */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-grid-3 { grid-template-columns: 1fr 1fr 1fr; }
.form-full { grid-column: 1 / -1; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-label { font-size: 13px; font-weight: 500; color: var(--text2); }
.form-control, .form-select, .form-textarea {
  padding: 11px 14px;
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: 9px; color: var(--text); font-size: 14px;
  font-family: 'DM Sans', sans-serif; outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
  width: 100%;
}
.form-control:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(59,130,246,.12);
}
.form-textarea { resize: vertical; min-height: 100px; }
.form-hint { font-size: 12px; color: var(--text3); }
.form-error { font-size: 12px; color: var(--red); }

/* ===== FLASH MESSAGES ===== */
.flash {
  padding: 13px 16px; border-radius: 10px;
  font-size: 14px; margin-bottom: 20px;
  display: flex; align-items: center; gap: 10px;
  animation: slideDown .3s ease;
}
@keyframes slideDown { from { opacity:0; transform:translateY(-8px); } to { opacity:1; transform:translateY(0); } }
.flash--success { background: rgba(16,185,129,.1); border: 1px solid rgba(16,185,129,.3); color: #6ee7b7; }
.flash--error   { background: rgba(239,68,68,.1);  border: 1px solid rgba(239,68,68,.3);  color: #fca5a5; }
.flash--info    { background: rgba(59,130,246,.1); border: 1px solid rgba(59,130,246,.3); color: #93c5fd; }

/* ===== MODAL ===== */
.modal-overlay {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(0,0,0,.7); backdrop-filter: blur(4px);
  display: flex; align-items: center; justify-content: center;
  padding: 20px;
  animation: fadeIn .2s ease;
}
@keyframes fadeIn { from { opacity:0; } to { opacity:1; } }
.modal {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  width: 100%; max-width: 560px;
  max-height: 90vh;
  overflow-y: auto;
  animation: scaleIn .25s ease;
}
@keyframes scaleIn { from { transform:scale(.95); opacity:0; } to { transform:scale(1); opacity:1; } }
.modal-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
}
.modal-title { font-family: 'Syne', sans-serif; font-size: 16px; font-weight: 700; }
.modal-close {
  width: 30px; height: 30px; border-radius: 8px;
  border: none; background: rgba(255,255,255,.06);
  color: var(--text2); cursor: pointer; font-size: 18px;
  display: grid; place-items: center; transition: background var(--transition);
}
.modal-close:hover { background: rgba(239,68,68,.15); color: #fca5a5; }
.modal-body { padding: 24px; }
.modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border);
  display: flex; justify-content: flex-end; gap: 10px;
}

/* ===== SEARCH BAR ===== */
.search-bar {
  display: flex; align-items: center; gap: 8px;
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: 9px; padding: 8px 12px;
  transition: border-color var(--transition);
}
.search-bar:focus-within { border-color: var(--blue); }
.search-bar input {
  background: none; border: none; color: var(--text);
  font-size: 14px; outline: none; font-family: 'DM Sans', sans-serif;
  width: 220px;
}
.search-icon { color: var(--text3); font-size: 15px; }

/* ===== PAGINATION ===== */
.pagination { display: flex; align-items: center; gap: 6px; margin-top: 16px; flex-wrap: wrap; }
.page-btn {
  min-width: 36px; height: 36px; border-radius: 8px;
  border: 1px solid var(--border); background: none;
  color: var(--text2); font-size: 13px; cursor: pointer;
  display: grid; place-items: center;
  transition: all var(--transition); font-family: 'DM Sans', sans-serif;
  text-decoration: none; padding: 0 10px;
}
.page-btn:hover { background: rgba(59,130,246,.1); border-color: var(--blue); color: var(--text); }
.page-btn.active { background: var(--blue); border-color: var(--blue); color: #fff; }
.page-btn:disabled { opacity: .4; cursor: not-allowed; }

/* ===== EMPTY STATE ===== */
.empty-state {
  text-align: center; padding: 60px 20px; color: var(--text3);
}
.empty-icon { font-size: 48px; margin-bottom: 16px; opacity: .5; }
.empty-title { font-family: 'Syne', sans-serif; font-size: 16px; font-weight: 600; color: var(--text2); margin-bottom: 8px; }
.empty-desc  { font-size: 14px; }

/* ===== AVATAR INITIALS ===== */
.avatar-initials {
  border-radius: 10px;
  display: grid; place-items: center;
  font-weight: 700; flex-shrink: 0;
  font-family: 'Syne', sans-serif;
}

/* ===== PROGRESS BAR ===== */
.progress-bar { background: var(--border); border-radius: 20px; overflow: hidden; height: 6px; }
.progress-fill { height: 100%; border-radius: 20px; background: linear-gradient(90deg, var(--blue), var(--cyan)); transition: width .5s ease; }

/* ===== TOOLTIPS ===== */
[data-tip] { position: relative; cursor: help; }
[data-tip]::after {
  content: attr(data-tip);
  position: absolute; bottom: calc(100% + 6px); left: 50%;
  transform: translateX(-50%);
  background: var(--card2); border: 1px solid var(--border2);
  color: var(--text); font-size: 12px; white-space: nowrap;
  padding: 5px 10px; border-radius: 6px;
  opacity: 0; pointer-events: none; transition: opacity .2s;
  z-index: 50;
}
[data-tip]:hover::after { opacity: 1; }

/* ===== DARK MODE TOGGLE ===== */
body.light-mode {
  --bg: #f0f4fa; --bg2: #e4eaf5; --bg3: #dde4f0;
  --card: #ffffff; --card2: #f5f7fb;
  --border: #d0d9eb; --border2: #b8c4d8;
  --text: #0f1629; --text2: #475569; --text3: #94a3b8;
}

/* ===== EXAM TIMER ===== */
.exam-timer {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 18px; border-radius: 10px;
  background: rgba(239,68,68,.1); border: 1px solid rgba(239,68,68,.2);
  font-family: 'Syne', sans-serif; font-size: 20px; font-weight: 700;
  color: #fca5a5;
}
.exam-timer.warning { background: rgba(245,158,11,.1); border-color: rgba(245,158,11,.2); color: #fcd34d; }
.exam-timer.danger  { background: rgba(239,68,68,.15); border-color: rgba(239,68,68,.4); color: #f87171; animation: pulse 1s ease-in-out infinite; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.7} }

/* ===== QUESTION CARD (exam) ===== */
.question-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; margin-bottom: 0; }
.question-num  { font-size: 12px; color: var(--text3); font-weight: 600; letter-spacing: .06em; text-transform: uppercase; margin-bottom: 10px; }
.question-text { font-size: 16px; font-weight: 500; line-height: 1.7; margin-bottom: 20px; }
.option-list   { display: flex; flex-direction: column; gap: 10px; }
.option-item {
  display: flex; align-items: center; gap: 12px;
  padding: 13px 16px; border-radius: 10px;
  border: 1px solid var(--border);
  cursor: pointer; transition: all var(--transition);
  user-select: none;
}
.option-item:hover { border-color: var(--blue-light); background: rgba(59,130,246,.05); }
.option-item.selected { border-color: var(--blue); background: rgba(59,130,246,.1); }
.option-item.correct  { border-color: var(--green); background: rgba(16,185,129,.1); }
.option-item.wrong    { border-color: var(--red);   background: rgba(239,68,68,.1); }
.option-label {
  width: 30px; height: 30px; border-radius: 8px;
  display: grid; place-items: center;
  border: 1px solid var(--border); font-size: 13px; font-weight: 600;
  flex-shrink: 0; transition: all var(--transition);
}
.option-item.selected .option-label { background: var(--blue); border-color: var(--blue); color: #fff; }
.option-item.correct  .option-label { background: var(--green); border-color: var(--green); color: #fff; }
.option-item.wrong    .option-label { background: var(--red); border-color: var(--red); color: #fff; }

/* ===== NAV DOTS (exam question nav) ===== */
.nav-dots { display: flex; flex-wrap: wrap; gap: 6px; }
.nav-dot {
  width: 32px; height: 32px; border-radius: 8px;
  border: 1px solid var(--border);
  display: grid; place-items: center;
  font-size: 12px; font-weight: 600;
  cursor: pointer; transition: all var(--transition);
}
.nav-dot:hover { border-color: var(--blue); color: var(--blue); }
.nav-dot.answered { background: var(--blue); border-color: var(--blue); color: #fff; }
.nav-dot.current  { border-color: var(--cyan); color: var(--cyan); box-shadow: 0 0 10px rgba(6,182,212,.3); }
.nav-dot.flagged  { background: rgba(245,158,11,.15); border-color: var(--yellow); color: var(--yellow); }

/* ===== RESPONSIVE ===== */
@media(max-width:768px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); box-shadow: var(--shadow-lg); }
  .main-content { margin-left: 0; }
  .form-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .page-body { padding: 16px; }
}
@media(max-width:480px) {
  .stats-grid { grid-template-columns: 1fr; }
}
</style>