/* =====================================================
   EduAssess Pro - Stylesheet Utama
   Clean, modern, responsive untuk HP & Desktop
   ===================================================== */

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

:root {
  --primary: #2563eb;
  --primary-dark: #1e40af;
  --primary-light: #dbeafe;
  --success: #16a34a;
  --success-light: #dcfce7;
  --warning: #ea580c;
  --warning-light: #fed7aa;
  --danger: #dc2626;
  --danger-light: #fee2e2;
  --purple: #7c3aed;
  --purple-light: #ede9fe;

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-tertiary: #94a3b8;

  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;

  --border: #e2e8f0;
  --border-strong: #cbd5e1;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.1);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", Roboto, sans-serif;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-secondary);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

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

.sidebar {
  width: 240px;
  background: var(--bg-primary);
  border-right: 1px solid var(--border);
  padding: 16px 12px;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  overflow-y: auto;
  z-index: 50;
  transition: transform 0.25s ease;
}

.sidebar-brand {
  display: flex; align-items: center; gap: 10px;
  padding: 10px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 16px;
}

.sidebar-brand-icon {
  width: 36px; height: 36px;
  background: var(--primary);
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  color: white; font-weight: 600;
}

.sidebar-brand-text h1 { font-size: 15px; font-weight: 600; }
.sidebar-brand-text p  { font-size: 11px; color: var(--text-tertiary); }

.sidebar-section {
  font-size: 10px;
  text-transform: uppercase;
  color: var(--text-tertiary);
  letter-spacing: 0.5px;
  padding: 12px 10px 6px;
  font-weight: 600;
}

.sidebar-link {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 12px;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 13.5px;
  margin-bottom: 2px;
  transition: all 0.15s;
}
.sidebar-link:hover { background: var(--bg-tertiary); text-decoration: none; color: var(--text-primary); }
.sidebar-link.active { background: var(--primary-light); color: var(--primary-dark); font-weight: 500; }
.sidebar-link i { font-size: 18px; width: 20px; text-align: center; }

.main { margin-left: 240px; flex: 1; min-width: 0; }

.topbar {
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border);
  padding: 12px 24px;
  display: flex; justify-content: space-between; align-items: center;
  position: sticky; top: 0; z-index: 40;
}

.topbar-title { font-size: 17px; font-weight: 600; }
.topbar-user { display: flex; align-items: center; gap: 12px; }

.user-avatar {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--primary-dark);
  display: flex; align-items: center; justify-content: center;
  font-weight: 600; font-size: 13px;
}
.user-info p { font-size: 13px; font-weight: 500; line-height: 1.2; }
.user-info span { font-size: 11px; color: var(--text-tertiary); }

.content { padding: 24px; max-width: 1400px; }

.menu-toggle {
  display: none;
  background: none; border: none;
  font-size: 22px; cursor: pointer;
  color: var(--text-primary);
}

/* ============ CARD ============ */
.card {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  margin-bottom: 16px;
}
.card-header {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 14px; flex-wrap: wrap; gap: 10px;
}
.card-title { font-size: 15px; font-weight: 600; }
.card-subtitle { font-size: 12px; color: var(--text-tertiary); margin-top: 2px; }

/* ============ METRIC ============ */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}
.metric-card {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px 18px;
}
.metric-label { font-size: 12px; color: var(--text-secondary); margin-bottom: 6px; }
.metric-value { font-size: 26px; font-weight: 600; line-height: 1.1; }
.metric-value.success { color: var(--success); }
.metric-value.warning { color: var(--warning); }
.metric-value.danger  { color: var(--danger); }
.metric-trend { font-size: 11px; color: var(--text-tertiary); margin-top: 4px; }

/* ============ BADGE ============ */
.badge {
  display: inline-block;
  padding: 3px 10px;
  font-size: 11px;
  border-radius: 999px;
  font-weight: 500;
}
.b-info { background: var(--primary-light); color: var(--primary-dark); }
.b-success { background: var(--success-light); color: var(--success); }
.b-warning { background: var(--warning-light); color: var(--warning); }
.b-danger { background: var(--danger-light); color: var(--danger); }
.b-purple { background: var(--purple-light); color: var(--purple); }
.b-gray { background: var(--bg-tertiary); color: var(--text-secondary); }

/* ============ BUTTON ============ */
.btn {
  display: inline-flex;
  align-items: center; justify-content: center;
  gap: 6px;
  padding: 9px 16px;
  font-size: 13px;
  font-weight: 500;
  font-family: inherit;
  border-radius: var(--radius-md);
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s;
  text-decoration: none;
  white-space: nowrap;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-success { background: var(--success); color: white; }
.btn-warning { background: var(--warning); color: white; }
.btn-danger { background: var(--danger); color: white; }
.btn-outline {
  background: var(--bg-primary);
  color: var(--text-primary);
  border-color: var(--border-strong);
}
.btn-outline:hover { background: var(--bg-tertiary); }
.btn-block { width: 100%; }
.btn-sm { padding: 6px 10px; font-size: 12px; }
.btn-lg { padding: 12px 22px; font-size: 14px; }
.btn i { font-size: 16px; }

/* ============ FORM ============ */
.form-group { margin-bottom: 14px; }
.form-label {
  display: block;
  font-size: 12.5px;
  color: var(--text-secondary);
  margin-bottom: 5px;
  font-weight: 500;
}
.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 9px 12px;
  font-size: 13.5px;
  font-family: inherit;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  color: var(--text-primary);
  transition: border-color 0.15s, box-shadow 0.15s;
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}
.form-textarea { min-height: 90px; resize: vertical; }
.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}
.form-help { font-size: 11px; color: var(--text-tertiary); margin-top: 4px; }
.form-check { display: flex; align-items: center; gap: 8px; padding: 6px 0; font-size: 13px; }
.form-check input[type="checkbox"] { width: 16px; height: 16px; cursor: pointer; }

/* ============ TABLE ============ */
.table-wrap { overflow-x: auto; border-radius: var(--radius-md); }
.table { width: 100%; border-collapse: collapse; font-size: 13px; }
.table th, .table td {
  padding: 11px 14px; text-align: left;
  border-bottom: 1px solid var(--border);
}
.table th {
  background: var(--bg-tertiary);
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.4px;
}
.table tbody tr:hover { background: var(--bg-secondary); }

/* ============ ALERT ============ */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius-md);
  margin-bottom: 14px;
  font-size: 13px;
  display: flex; align-items: center; gap: 10px;
}
.alert-info { background: var(--primary-light); color: var(--primary-dark); border-left: 3px solid var(--primary); }
.alert-success { background: var(--success-light); color: var(--success); border-left: 3px solid var(--success); }
.alert-warning { background: var(--warning-light); color: var(--warning); border-left: 3px solid var(--warning); }
.alert-danger { background: var(--danger-light); color: var(--danger); border-left: 3px solid var(--danger); }

/* ============ PROGRESS ============ */
.progress {
  width: 100%; height: 8px;
  background: var(--bg-tertiary);
  border-radius: 4px;
  overflow: hidden;
}
.progress-bar {
  height: 100%;
  background: var(--primary);
  border-radius: 4px;
  transition: width 0.3s;
}
.progress-bar.success { background: var(--success); }
.progress-bar.warning { background: var(--warning); }
.progress-bar.danger { background: var(--danger); }

/* ============ EMPTY ============ */
.empty {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-tertiary);
}
.empty i { font-size: 48px; margin-bottom: 12px; display: block; }
.empty p { font-size: 14px; }

/* ============ AUTH ============ */
.auth-page {
  min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
  padding: 20px;
}
.auth-card {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  width: 100%; max-width: 420px;
  box-shadow: var(--shadow-lg);
}
.auth-brand { text-align: center; margin-bottom: 24px; }
.auth-brand .icon-box {
  width: 56px; height: 56px;
  background: var(--primary); color: white;
  border-radius: var(--radius-lg);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 26px; margin-bottom: 12px;
}
.auth-brand h1 { font-size: 22px; font-weight: 600; margin-bottom: 4px; }
.auth-brand p { font-size: 13px; color: var(--text-tertiary); }

/* ============ EXAM (LOCKED) ============ */
.exam-mode { background: var(--bg-secondary); min-height: 100vh; padding: 16px; }
.exam-lockbar {
  background: var(--danger);
  color: white;
  padding: 10px 16px;
  border-radius: var(--radius-md);
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 16px; font-size: 13px;
}
.exam-lockbar i { font-size: 18px; }
.exam-lockbar .timer-display {
  margin-left: auto;
  background: rgba(255,255,255,0.2);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-weight: 600; font-size: 14px;
  font-variant-numeric: tabular-nums;
}
.exam-container { max-width: 880px; margin: 0 auto; }
.exam-question {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: 24px; margin-bottom: 16px;
}
.exam-question-text { font-size: 15px; line-height: 1.7; margin-bottom: 18px; }

.option-list { display: flex; flex-direction: column; gap: 8px; }
.option-item {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 16px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.15s;
}
.option-item:hover { background: var(--bg-secondary); border-color: var(--border-strong); }
.option-item.selected { border-color: var(--primary); background: var(--primary-light); }
.option-letter {
  width: 28px; height: 28px;
  border-radius: 50%;
  border: 1.5px solid var(--border-strong);
  display: flex; align-items: center; justify-content: center;
  font-weight: 600; font-size: 12px;
  flex-shrink: 0;
}
.option-item.selected .option-letter { border-color: var(--primary); background: var(--primary); color: white; }

.exam-nav {
  display: flex; justify-content: space-between; gap: 10px;
  margin-top: 16px; flex-wrap: wrap;
}
.question-jumper {
  display: flex; gap: 4px; flex-wrap: wrap; justify-content: center;
}
.q-jump {
  width: 32px; height: 32px;
  border: 1px solid var(--border);
  background: var(--bg-primary);
  border-radius: var(--radius-sm);
  font-size: 11px; font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
}
.q-jump.current { background: var(--primary); color: white; border-color: var(--primary); }
.q-jump.answered { background: var(--success-light); color: var(--success); border-color: var(--success); }

/* ============ CHAT ============ */
.chat-box {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  display: flex; flex-direction: column;
  height: 70vh; min-height: 400px;
}
.chat-header {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 12px;
}
.chat-messages { flex: 1; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 8px; }
.chat-msg { max-width: 75%; padding: 9px 13px; border-radius: var(--radius-md); font-size: 13.5px; line-height: 1.5; }
.chat-mine { background: var(--primary); color: white; align-self: flex-end; border-bottom-right-radius: 4px; }
.chat-theirs { background: var(--bg-tertiary); align-self: flex-start; border-bottom-left-radius: 4px; }
.chat-time { font-size: 10px; color: var(--text-tertiary); margin: 0 4px; }
.chat-input { padding: 12px; border-top: 1px solid var(--border); display: flex; gap: 8px; }

/* ============ RESPONSIVE ============ */
@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); box-shadow: var(--shadow-lg); }
  .sidebar.open { transform: translateX(0); }
  .main { margin-left: 0; }
  .menu-toggle { display: block; }
  .topbar { padding: 12px 16px; }
  .topbar-title { font-size: 15px; }
  .content { padding: 16px; }
  .card { padding: 14px 16px; }
  .form-row { grid-template-columns: 1fr; }
  .metrics-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .metric-value { font-size: 22px; }
  .table th, .table td { padding: 9px 10px; font-size: 12.5px; }
  .exam-question { padding: 16px; }
  .user-info { display: none; }
}
@media (max-width: 480px) {
  .metrics-grid { grid-template-columns: 1fr 1fr; }
  .btn { padding: 8px 12px; font-size: 12.5px; }
  .auth-card { padding: 28px 22px; }
}

/* ============ UTILITIES ============ */
.flex { display: flex; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.flex-end { display: flex; justify-content: flex-end; }
.flex-wrap { flex-wrap: wrap; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 12px; }
.mt-1 { margin-top: 6px; }
.mt-2 { margin-top: 12px; }
.mt-3 { margin-top: 18px; }
.mb-1 { margin-bottom: 6px; }
.mb-2 { margin-bottom: 12px; }
.mb-3 { margin-bottom: 18px; }
.text-center { text-align: center; }
.text-muted { color: var(--text-tertiary); }
.text-sm { font-size: 12px; }
.fw-500 { font-weight: 500; }
.fw-600 { font-weight: 600; }

::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-tertiary); }