/* ============================================================
   ÖVSV Lernplattform – Complete Stylesheet
   ============================================================ */

:root {
  --primary:        #003366;
  --primary-light:  #0055A5;
  --primary-dark:   #001f3f;
  --accent:         #FF6600;
  --accent-light:   #FF8533;
  --success:        #28a745;
  --warning:        #e6a817;
  --danger:         #dc3545;
  --info:           #17a2b8;
  --white:          #ffffff;
  --gray-100:       #f8f9fa;
  --gray-200:       #e9ecef;
  --gray-300:       #dee2e6;
  --gray-400:       #ced4da;
  --gray-500:       #adb5bd;
  --gray-600:       #6c757d;
  --gray-700:       #495057;
  --gray-800:       #343a40;
  --gray-900:       #212529;
  --shadow:         0 2px 10px rgba(0,0,0,0.10);
  --shadow-lg:      0 8px 30px rgba(0,0,0,0.15);
  --radius:         8px;
  --radius-lg:      12px;
  --transition:     all 0.25s ease;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: var(--gray-100);
  color: var(--gray-800);
  line-height: 1.6;
  font-size: 15px;
}

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

img { max-width: 100%; }

h1,h2,h3,h4,h5,h6 { font-weight: 600; line-height: 1.3; }

/* ── Utilities ─────────────────────────────────────────────── */
.d-none  { display: none !important; }
.d-flex  { display: flex !important; }
.d-block { display: block !important; }
.d-grid  { display: grid !important; }
.flex-column  { flex-direction: column !important; }
.flex-wrap    { flex-wrap: wrap !important; }
.align-center { align-items: center !important; }
.justify-center  { justify-content: center !important; }
.justify-between { justify-content: space-between !important; }
.gap-1 { gap: .25rem !important; }
.gap-2 { gap: .5rem  !important; }
.gap-3 { gap: 1rem   !important; }
.gap-4 { gap: 1.5rem !important; }
.w-100  { width: 100% !important; }
.h-100  { height: 100% !important; }
.mt-1 { margin-top: .25rem !important; }
.mt-2 { margin-top: .5rem  !important; }
.mt-3 { margin-top: 1rem   !important; }
.mt-4 { margin-top: 1.5rem !important; }
.mb-1 { margin-bottom: .25rem !important; }
.mb-2 { margin-bottom: .5rem  !important; }
.mb-3 { margin-bottom: 1rem   !important; }
.mb-4 { margin-bottom: 1.5rem !important; }
.p-3  { padding: 1rem   !important; }
.p-4  { padding: 1.5rem !important; }
.text-center  { text-align: center !important; }
.text-right   { text-align: right  !important; }
.text-primary { color: var(--primary) !important; }
.text-accent  { color: var(--accent)  !important; }
.text-success { color: var(--success) !important; }
.text-warning { color: var(--warning) !important; }
.text-danger  { color: var(--danger)  !important; }
.text-muted   { color: var(--gray-600) !important; }
.text-white   { color: var(--white)   !important; }
.fw-bold { font-weight: 700 !important; }
.fs-sm  { font-size: .85rem !important; }
.fs-lg  { font-size: 1.1rem !important; }

/* ── Buttons ───────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .55rem 1.25rem;
  border: 2px solid transparent;
  border-radius: var(--radius);
  font-size: .93rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  line-height: 1.5;
  white-space: nowrap;
}
.btn:hover  { transform: translateY(-1px); filter: brightness(1.08); }
.btn:active { transform: translateY(0);    filter: brightness(.95); }

.btn-primary { background: var(--primary); color: var(--white); }
.btn-primary:hover { background: var(--primary-light); color: var(--white); }

.btn-accent  { background: var(--accent); color: var(--white); }
.btn-accent:hover { background: var(--accent-light); color: var(--white); }

.btn-success { background: var(--success); color: var(--white); }
.btn-success:hover { background: #218838; color: var(--white); }

.btn-danger  { background: var(--danger); color: var(--white); }
.btn-danger:hover { background: #c82333; color: var(--white); }

.btn-outline {
  background: transparent;
  border-color: var(--primary);
  color: var(--primary);
}
.btn-outline:hover { background: var(--primary); color: var(--white); }

.btn-light { background: var(--gray-100); color: var(--gray-800); border-color: var(--gray-300); }
.btn-light:hover { background: var(--gray-200); }

.btn-sm  { padding: .3rem .75rem; font-size: .82rem; }
.btn-lg  { padding: .75rem 2rem; font-size: 1.05rem; }
.btn-block { width: 100%; }

.btn:disabled {
  opacity: .6;
  cursor: not-allowed;
  transform: none;
  filter: none;
}

/* ── Forms ─────────────────────────────────────────────────── */
.form-group { margin-bottom: 1.1rem; }

.form-label {
  display: block;
  font-weight: 500;
  font-size: .9rem;
  margin-bottom: .35rem;
  color: var(--gray-700);
}

.form-control, .form-select {
  width: 100%;
  padding: .6rem .95rem;
  border: 2px solid var(--gray-300);
  border-radius: var(--radius);
  font-size: .93rem;
  font-family: inherit;
  color: var(--gray-800);
  background: var(--white);
  transition: var(--transition);
}
.form-control:focus, .form-select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(0,51,102,.12);
}
.form-control.is-invalid { border-color: var(--danger); }

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24'%3E%3Cpath fill='%236c757d' d='M7 10l5 5 5-5z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right .75rem center;
  padding-right: 2.5rem;
}

.form-error {
  color: var(--danger);
  font-size: .82rem;
  margin-top: .25rem;
  display: none;
}
.form-error.show { display: block; }

.form-hint { color: var(--gray-600); font-size: .82rem; margin-top: .2rem; }

.input-group { display: flex; }
.input-group .form-control { border-radius: var(--radius) 0 0 var(--radius); }
.input-group .btn { border-radius: 0 var(--radius) var(--radius) 0; border-left: none; }

/* ── Cards ─────────────────────────────────────────────────── */
.card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.card-header {
  padding: .9rem 1.4rem;
  background: var(--primary);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.card-header h2, .card-header h3 { margin: 0; font-size: 1rem; }
.card-body   { padding: 1.4rem; }
.card-footer {
  padding: .9rem 1.4rem;
  background: var(--gray-100);
  border-top: 1px solid var(--gray-200);
}

/* ── Navbar ────────────────────────────────────────────────── */
.navbar {
  background: var(--primary);
  color: var(--white);
  height: 60px;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 200;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: .75rem;
  text-decoration: none;
  color: var(--white);
}
.navbar-brand:hover { text-decoration: none; }
.brand-icon {
  width: 38px; height: 38px;
  background: var(--accent);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.brand-text-wrap { display: flex; flex-direction: column; line-height: 1.1; }
.brand-title    { font-size: .95rem; font-weight: 700; }
.brand-subtitle { font-size: .68rem; opacity: .8; }

.navbar-nav {
  display: flex;
  align-items: center;
  gap: .25rem;
  list-style: none;
}
.navbar-nav a {
  color: rgba(255,255,255,.85);
  text-decoration: none;
  padding: .45rem .8rem;
  border-radius: var(--radius);
  font-size: .88rem;
  transition: var(--transition);
  display: flex; align-items: center; gap: .4rem;
}
.navbar-nav a:hover,
.navbar-nav a.active { color: var(--white); background: rgba(255,255,255,.15); }

.navbar-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--white);
  font-size: 1.4rem;
  cursor: pointer;
}

/* ── Sidebar + Layout ──────────────────────────────────────── */
.app-layout {
  display: flex;
  min-height: calc(100vh - 60px);
}

.sidebar {
  width: 240px;
  background: var(--primary);
  flex-shrink: 0;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.sidebar-user {
  padding: 1.25rem;
  border-bottom: 1px solid rgba(255,255,255,.15);
  display: flex;
  align-items: center;
  gap: .75rem;
}
.user-avatar {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--accent);
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
  color: var(--white);
  font-weight: 700;
  flex-shrink: 0;
}
.user-info .user-name { font-size: .88rem; font-weight: 600; color: var(--white); }
.user-info .user-call { font-size: .75rem; color: rgba(255,255,255,.65); }

.sidebar-nav { list-style: none; padding: .5rem 0; flex: 1; }
.sidebar-nav .nav-section {
  padding: .75rem 1.2rem .25rem;
  font-size: .67rem;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: rgba(255,255,255,.45);
  font-weight: 600;
}
.sidebar-nav li a {
  display: flex;
  align-items: center;
  gap: .7rem;
  padding: .65rem 1.2rem;
  color: rgba(255,255,255,.8);
  text-decoration: none;
  font-size: .88rem;
  transition: var(--transition);
  border-left: 3px solid transparent;
}
.sidebar-nav li a:hover,
.sidebar-nav li a.active {
  color: var(--white);
  background: rgba(255,255,255,.1);
  border-left-color: var(--accent);
}
.sidebar-nav li a .nav-badge {
  margin-left: auto;
  background: var(--accent);
  color: var(--white);
  font-size: .68rem;
  padding: .1rem .45rem;
  border-radius: 100px;
  font-weight: 700;
}

.main-content {
  flex: 1;
  padding: 2rem;
  overflow-y: auto;
  min-width: 0;
}

/* ── Page header ───────────────────────────────────────────── */
.page-header { margin-bottom: 1.75rem; }
.page-header h1 { font-size: 1.65rem; color: var(--primary); margin-bottom: .2rem; }
.page-header p  { color: var(--gray-600); }

.breadcrumb {
  display: flex;
  align-items: center;
  gap: .4rem;
  font-size: .82rem;
  color: var(--gray-600);
  margin-bottom: .75rem;
}
.breadcrumb a { color: var(--primary); }
.breadcrumb .sep { color: var(--gray-400); }

/* ── Stats grid ────────────────────────────────────────────── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 1.25rem;
  margin-bottom: 1.75rem;
}

.stat-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  gap: 1rem;
  border-left: 4px solid var(--primary);
  transition: var(--transition);
}
.stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.stat-card.accent  { border-left-color: var(--accent); }
.stat-card.success { border-left-color: var(--success); }
.stat-card.warning { border-left-color: var(--warning); }

.stat-icon {
  width: 46px; height: 46px;
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem;
  background: rgba(0,51,102,.1);
  color: var(--primary);
  flex-shrink: 0;
}
.stat-card.accent  .stat-icon { background: rgba(255,102,0,.1);  color: var(--accent); }
.stat-card.success .stat-icon { background: rgba(40,167,69,.1);  color: var(--success); }
.stat-card.warning .stat-icon { background: rgba(230,168,23,.1); color: var(--warning); }

.stat-value { font-size: 1.75rem; font-weight: 800; line-height: 1; color: var(--gray-900); }
.stat-label { font-size: .8rem; color: var(--gray-600); margin-top: .15rem; }

/* ── Progress bars ─────────────────────────────────────────── */
.progress-container { margin-bottom: .9rem; }
.progress-header { display: flex; justify-content: space-between; margin-bottom: .35rem; }
.progress-label { font-size: .88rem; font-weight: 500; color: var(--gray-700); }
.progress-pct   { font-size: .82rem; font-weight: 700; color: var(--primary); }
.progress-track {
  background: var(--gray-200);
  border-radius: 100px;
  height: 9px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  border-radius: 100px;
  background: var(--primary);
  transition: width .6s ease;
}
.progress-fill.accent  { background: var(--accent); }
.progress-fill.success { background: var(--success); }
.progress-fill.warning { background: var(--warning); }

/* ── Chart cards ───────────────────────────────────────────── */
.charts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 1.25rem;
  margin-bottom: 1.75rem;
}
.chart-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 1.4rem;
  box-shadow: var(--shadow);
}
.chart-card h3 {
  font-size: .95rem;
  color: var(--gray-700);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: .5rem;
}

/* ── Achievements ──────────────────────────────────────────── */
.achievements-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
  gap: .85rem;
}
.achievement {
  text-align: center;
  padding: 1rem .5rem .8rem;
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  opacity: .38;
  transition: var(--transition);
  border: 2px solid transparent;
}
.achievement.earned { opacity: 1; border-color: var(--accent); }
.achievement-icon { font-size: 2rem; margin-bottom: .35rem; }
.achievement-name { font-size: .72rem; font-weight: 600; color: var(--gray-700); }

/* ── Table ─────────────────────────────────────────────────── */
.table-wrapper {
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  overflow-x: auto;
}
.table { width: 100%; border-collapse: collapse; font-size: .88rem; }
.table th {
  background: var(--primary);
  color: var(--white);
  padding: .75rem 1rem;
  text-align: left;
  font-weight: 500;
  white-space: nowrap;
}
.table td { padding: .7rem 1rem; border-bottom: 1px solid var(--gray-200); }
.table tbody tr:last-child td { border-bottom: none; }
.table tbody tr:hover td { background: var(--gray-100); }

/* ── Badges ────────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  padding: .2rem .6rem;
  border-radius: 100px;
  font-size: .74rem;
  font-weight: 600;
}
.badge-primary { background: rgba(0,51,102,.15);  color: var(--primary); }
.badge-accent  { background: rgba(255,102,0,.15); color: var(--accent); }
.badge-success { background: rgba(40,167,69,.15); color: #155724; }
.badge-warning { background: rgba(230,168,23,.2); color: #856404; }
.badge-danger  { background: rgba(220,53,69,.15); color: #721c24; }
.badge-info    { background: rgba(23,162,184,.15);color: #0c5460; }

/* ── Alerts ────────────────────────────────────────────────── */
.alert {
  padding: .9rem 1.1rem;
  border-radius: var(--radius);
  margin-bottom: 1rem;
  display: flex;
  align-items: flex-start;
  gap: .75rem;
  font-size: .9rem;
  border-left: 4px solid transparent;
}
.alert i { margin-top: .1rem; flex-shrink: 0; }
.alert-success { background: #d4edda; color: #155724; border-left-color: var(--success); }
.alert-warning { background: #fff3cd; color: #856404; border-left-color: var(--warning); }
.alert-danger  { background: #f8d7da; color: #721c24; border-left-color: var(--danger); }
.alert-info    { background: #d1ecf1; color: #0c5460; border-left-color: var(--info); }

/* ── Toast ─────────────────────────────────────────────────── */
.toast-container {
  position: fixed;
  top: 72px;
  right: 1.25rem;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: .5rem;
  pointer-events: none;
}
.toast {
  padding: .75rem 1.1rem;
  border-radius: var(--radius);
  color: var(--white);
  font-size: .88rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: .7rem;
  min-width: 260px;
  max-width: 380px;
  box-shadow: var(--shadow-lg);
  animation: toastIn .3s ease;
  pointer-events: all;
}
.toast-success { background: var(--success); }
.toast-error   { background: var(--danger); }
.toast-info    { background: var(--primary); }
.toast-warning { background: var(--warning); color: var(--gray-900); }
@keyframes toastIn  { from { opacity:0; transform:translateX(20px); } to { opacity:1; transform:translateX(0); } }
@keyframes toastOut { from { opacity:1; }                              to { opacity:0; transform:translateX(20px); } }
.toast.hiding { animation: toastOut .3s ease forwards; }

/* ── Modal ─────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.55);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s ease;
}
.modal-overlay.show { opacity: 1; pointer-events: all; }
.modal {
  background: var(--white);
  border-radius: var(--radius-lg);
  max-width: 520px;
  width: 100%;
  box-shadow: var(--shadow-lg);
  transform: scale(.92);
  transition: transform .25s ease;
  display: flex;
  flex-direction: column;
  max-height: calc(100vh - 2rem);
  overflow: hidden;
}
.modal-overlay.show .modal { transform: scale(1); }
.modal-header {
  padding: 1.1rem 1.4rem;
  border-bottom: 1px solid var(--gray-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}
.modal-header h3 { margin: 0; font-size: 1.05rem; color: var(--primary); }
.modal-body   { padding: 1.4rem; overflow-y: auto; flex: 1; }
.modal-footer {
  padding: .9rem 1.4rem;
  border-top: 1px solid var(--gray-200);
  display: flex;
  gap: .75rem;
  justify-content: flex-end;
}
.modal-close {
  background: none; border: none;
  font-size: 1.2rem; cursor: pointer;
  color: var(--gray-500); padding: .15rem;
  line-height: 1;
}
.modal-close:hover { color: var(--danger); }

/* ══════════════════════════════════════════════════════════════
   AUTH PAGE (index.html)
   ══════════════════════════════════════════════════════════════ */
.auth-page {
  min-height: 100vh;
  background: linear-gradient(145deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
}

.auth-header { text-align: center; margin-bottom: 2rem; color: var(--white); }
.auth-logo-circle {
  width: 78px; height: 78px;
  background: var(--accent);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto .9rem;
  font-size: 2rem;
  box-shadow: 0 4px 20px rgba(0,0,0,.25);
}
.auth-header h1 { font-size: 1.75rem; font-weight: 700; margin-bottom: .25rem; }
.auth-header p  { opacity: .8; font-size: .93rem; }

.auth-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 470px;
  overflow: hidden;
}

.auth-tabs {
  display: flex;
  background: var(--gray-100);
  border-bottom: 2px solid var(--gray-200);
}
.auth-tab {
  flex: 1;
  padding: .9rem;
  background: none;
  border: none;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  font-size: .9rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--gray-600);
  transition: var(--transition);
}
.auth-tab.active { color: var(--primary); border-bottom-color: var(--primary); background: var(--white); }

.auth-panel { padding: 2rem; display: none; }
.auth-panel.active { display: block; }

.auth-divider {
  text-align: center;
  color: var(--gray-500);
  font-size: .8rem;
  position: relative;
  margin: 1rem 0;
}
.auth-divider::before,
.auth-divider::after {
  content: '';
  position: absolute;
  top: 50%;
  width: 42%;
  height: 1px;
  background: var(--gray-300);
}
.auth-divider::before { left: 0; }
.auth-divider::after  { right: 0; }

.auth-footer-links {
  text-align: center;
  font-size: .83rem;
  color: var(--gray-600);
  margin-top: .75rem;
}

.category-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: .6rem;
  margin-top: .4rem;
}
.category-card-option {
  border: 2px solid var(--gray-300);
  border-radius: var(--radius);
  padding: .7rem .4rem;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
}
.category-card-option:hover { border-color: var(--primary); }
.category-card-option.selected { border-color: var(--primary); background: rgba(0,51,102,.07); }
.category-card-option input[type="radio"] { display: none; }
.category-card-option .cat-num { font-size: 1.3rem; font-weight: 800; color: var(--primary); }
.category-card-option .cat-label { font-size: .72rem; color: var(--gray-600); }

/* ══════════════════════════════════════════════════════════════
   LEARN PAGE
   ══════════════════════════════════════════════════════════════ */
.learn-layout {
  display: grid;
  grid-template-columns: 270px 1fr;
  gap: 1.5rem;
  height: calc(100vh - 60px - 4rem);
}

.learn-sidebar {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}
.learn-sidebar-header {
  padding: 1rem 1.1rem .8rem;
  background: var(--primary);
  color: var(--white);
  flex-shrink: 0;
}
.learn-sidebar-header h3 { font-size: .88rem; margin: 0; }

.cat-filter {
  padding: .8rem;
  border-bottom: 1px solid var(--gray-200);
  display: flex;
  flex-direction: column;
  gap: .4rem;
}
.cat-filter-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .5rem .7rem;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius);
  background: none;
  cursor: pointer;
  font-size: .83rem;
  font-weight: 500;
  color: var(--gray-700);
  transition: var(--transition);
  text-align: left;
}
.cat-filter-btn:hover   { border-color: var(--primary); color: var(--primary); }
.cat-filter-btn.active  { background: var(--primary); color: var(--white); border-color: var(--primary); }
.cat-filter-btn .badge  { pointer-events: none; }

.topic-list { list-style: none; padding: .4rem 0; overflow-y: auto; flex: 1; }
.topic-item {
  display: flex;
  align-items: center;
  gap: .5rem;
  padding: .55rem 1rem;
  cursor: pointer;
  font-size: .84rem;
  color: var(--gray-700);
  transition: var(--transition);
  border-left: 3px solid transparent;
}
.topic-item:hover   { background: var(--gray-100); color: var(--primary); border-left-color: var(--primary-light); }
.topic-item.active  { background: rgba(0,51,102,.09); color: var(--primary); font-weight: 600; border-left-color: var(--primary); }
.topic-item.learned { color: var(--success); }
.topic-item .topic-check { font-size: .72rem; color: var(--gray-400); margin-left: auto; }
.topic-item.learned .topic-check { color: var(--success); }

.learn-content {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow-y: auto;
  padding: 1.75rem 2rem;
}

.learn-topic-header {
  border-bottom: 2px solid var(--gray-200);
  padding-bottom: 1rem;
  margin-bottom: 1.5rem;
}
.learn-topic-header h2 { color: var(--primary); font-size: 1.4rem; margin-bottom: .2rem; }
.learn-meta { display: flex; align-items: center; gap: 1rem; font-size: .82rem; color: var(--gray-600); flex-wrap: wrap; }

.learn-section { margin-bottom: 1.75rem; }
.learn-section h3 {
  color: var(--primary);
  font-size: 1.05rem;
  margin-bottom: .65rem;
  padding-bottom: .4rem;
  border-bottom: 1px solid var(--gray-200);
  display: flex; align-items: center; gap: .5rem;
}
.learn-section p  { color: var(--gray-700); margin-bottom: .65rem; line-height: 1.7; }
.learn-section ul, .learn-section ol { padding-left: 1.5rem; color: var(--gray-700); }
.learn-section li { margin-bottom: .3rem; line-height: 1.6; }

.key-facts {
  background: rgba(0,51,102,.05);
  border-left: 4px solid var(--primary);
  padding: 1rem 1.1rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 1rem 0;
}
.key-facts h4 { color: var(--primary); font-size: .8rem; text-transform: uppercase; letter-spacing: .06em; margin-bottom: .6rem; }
.key-facts ul { padding-left: 1.25rem; }
.key-facts li { font-size: .88rem; margin-bottom: .25rem; color: var(--gray-700); }

.formula-box {
  background: var(--gray-800);
  color: var(--white);
  padding: .9rem 1.5rem;
  border-radius: var(--radius);
  font-family: 'Courier New', monospace;
  font-size: 1.05rem;
  text-align: center;
  margin: .9rem 0;
  letter-spacing: .04em;
}

.info-box {
  background: #e8f4fd;
  border-left: 4px solid var(--info);
  padding: .9rem 1.1rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 1rem 0;
  font-size: .88rem;
  color: #0c5460;
}

.learn-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--gray-200);
}

.mark-learned-section {
  background: var(--gray-100);
  border-radius: var(--radius);
  padding: 1.1rem;
  text-align: center;
  margin-top: 1.5rem;
  border: 2px dashed var(--gray-300);
}
.mark-learned-section.learned-done {
  background: rgba(40,167,69,.08);
  border-color: var(--success);
}

/* ══════════════════════════════════════════════════════════════
   QUIZ PAGE
   ══════════════════════════════════════════════════════════════ */
.quiz-wrapper { max-width: 760px; margin: 0 auto; }

.quiz-setup-card { background: var(--white); border-radius: var(--radius); box-shadow: var(--shadow); padding: 2rem; }
.quiz-setup-card h2 { color: var(--primary); margin-bottom: 1.25rem; }

.quiz-header-bar {
  background: var(--white);
  border-radius: var(--radius);
  padding: .9rem 1.25rem;
  box-shadow: var(--shadow);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
}
.quiz-header-bar .progress-track { flex: 1; }

.quiz-counter { font-size: .85rem; color: var(--gray-600); white-space: nowrap; }

.quiz-timer {
  display: flex;
  align-items: center;
  gap: .35rem;
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--primary);
  min-width: 52px;
}
.quiz-timer.warn { color: var(--warning); }
.quiz-timer.crit { color: var(--danger); animation: timerPulse .5s ease infinite; }
@keyframes timerPulse { 0%,100% { transform: scale(1); } 50% { transform: scale(1.12); } }

.question-card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.75rem;
  margin-bottom: 1.25rem;
}
.q-category-tag {
  display: inline-block;
  padding: .18rem .65rem;
  background: rgba(0,51,102,.1);
  color: var(--primary);
  border-radius: 100px;
  font-size: .73rem;
  font-weight: 700;
  margin-bottom: .9rem;
  text-transform: uppercase;
  letter-spacing: .04em;
}
.question-text {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 1.4rem;
  line-height: 1.5;
}
.answers-list { display: flex; flex-direction: column; gap: .65rem; }

.answer-btn {
  display: flex;
  align-items: flex-start;
  gap: .9rem;
  padding: .9rem 1.1rem;
  background: var(--gray-100);
  border: 2px solid var(--gray-200);
  border-radius: var(--radius);
  cursor: pointer;
  text-align: left;
  font-size: .9rem;
  font-family: inherit;
  color: var(--gray-700);
  transition: var(--transition);
  width: 100%;
  line-height: 1.5;
}
.answer-btn:hover:not(:disabled) {
  border-color: var(--primary);
  background: rgba(0,51,102,.05);
  color: var(--primary);
}
.answer-letter {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 26px; height: 26px;
  border-radius: 50%;
  background: var(--gray-300);
  color: var(--gray-700);
  font-weight: 800;
  font-size: .8rem;
  flex-shrink: 0;
  transition: var(--transition);
}
.answer-btn:hover:not(:disabled) .answer-letter { background: var(--primary); color: var(--white); }

.answer-btn.correct { border-color: var(--success); background: rgba(40,167,69,.09); color: #155724; }
.answer-btn.correct .answer-letter { background: var(--success); color: var(--white); }

.answer-btn.wrong   { border-color: var(--danger); background: rgba(220,53,69,.09); color: #721c24; }
.answer-btn.wrong .answer-letter   { background: var(--danger);  color: var(--white); }

.answer-btn:disabled { cursor: not-allowed; }

.feedback-panel {
  display: none;
  padding: .9rem 1.1rem;
  border-radius: var(--radius);
  margin-top: .9rem;
  font-size: .88rem;
  gap: .65rem;
  align-items: flex-start;
}
.feedback-panel.show { display: flex; }
.feedback-panel.fb-correct { background: rgba(40,167,69,.1); border-left: 4px solid var(--success); color: #155724; }
.feedback-panel.fb-wrong   { background: rgba(220,53,69,.1);  border-left: 4px solid var(--danger);  color: #721c24; }
.feedback-panel i { margin-top: .1rem; flex-shrink: 0; }

.quiz-footer { display: flex; justify-content: flex-end; gap: .75rem; margin-top: 1.25rem; }

/* Results */
.results-wrapper { max-width: 650px; margin: 0 auto; text-align: center; }

.score-ring {
  width: 148px; height: 148px;
  border-radius: 50%;
  border: 8px solid var(--primary);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.25rem;
}
.score-ring.excellent { border-color: var(--success); }
.score-ring.good      { border-color: var(--primary); }
.score-ring.poor      { border-color: var(--danger); }
.score-num   { font-size: 2.4rem; font-weight: 900; line-height: 1; }
.score-ring.excellent .score-num { color: var(--success); }
.score-ring.good      .score-num { color: var(--primary); }
.score-ring.poor      .score-num { color: var(--danger); }
.score-sub   { font-size: .78rem; color: var(--gray-600); }

.result-stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: .9rem;
  margin: 1.25rem 0;
}
.result-stat {
  background: var(--white);
  border-radius: var(--radius);
  padding: .9rem .75rem;
  box-shadow: var(--shadow);
}
.result-stat .rs-value { font-size: 1.45rem; font-weight: 800; }
.result-stat .rs-label { font-size: .76rem; color: var(--gray-600); }
.rs-correct .rs-value { color: var(--success); }
.rs-wrong   .rs-value { color: var(--danger); }
.rs-time    .rs-value { color: var(--primary); }

.review-list { text-align: left; margin-top: 1.5rem; }
.review-item {
  background: var(--white);
  border-radius: var(--radius);
  padding: .9rem 1.1rem;
  margin-bottom: .65rem;
  box-shadow: var(--shadow);
  border-left: 4px solid var(--gray-300);
}
.review-item.ok   { border-left-color: var(--success); }
.review-item.fail { border-left-color: var(--danger); }
.review-q    { font-weight: 600; font-size: .87rem; margin-bottom: .35rem; }
.review-a    { font-size: .82rem; color: var(--gray-600); }
.review-a .ok-text   { color: var(--success); font-weight: 600; }
.review-a .fail-text { color: var(--danger);  font-weight: 600; }

/* ══════════════════════════════════════════════════════════════
   ADMIN PAGE
   ══════════════════════════════════════════════════════════════ */
.admin-login-page {
  min-height: 100vh;
  background: linear-gradient(145deg, #0d0d1f 0%, #1a1a3e 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}
.admin-login-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 60px rgba(0,0,0,.4);
  padding: 2.5rem;
  width: 100%;
  max-width: 400px;
  text-align: center;
}
.admin-login-card .admin-logo {
  width: 64px; height: 64px;
  background: var(--primary);
  border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto .9rem;
  font-size: 1.8rem;
  color: var(--white);
}
.admin-login-card h2 { color: var(--gray-900); margin-bottom: .25rem; }
.admin-login-card .sub { color: var(--gray-600); font-size: .88rem; margin-bottom: 1.75rem; }

.admin-layout { display: flex; min-height: calc(100vh - 60px); }
.admin-sidebar {
  width: 220px;
  background: var(--gray-900);
  flex-shrink: 0;
}
.admin-sidebar-brand {
  padding: 1.25rem;
  color: var(--white);
  border-bottom: 1px solid rgba(255,255,255,.1);
  font-weight: 700;
  font-size: .95rem;
  display: flex; align-items: center; gap: .6rem;
}
.admin-nav { list-style: none; padding: .5rem 0; }
.admin-nav a {
  display: flex;
  align-items: center;
  gap: .65rem;
  padding: .65rem 1.2rem;
  color: rgba(255,255,255,.7);
  text-decoration: none;
  font-size: .87rem;
  transition: var(--transition);
  border-left: 3px solid transparent;
}
.admin-nav a:hover, .admin-nav a.active {
  color: var(--white);
  background: rgba(255,255,255,.08);
  border-left-color: var(--accent);
}
.admin-main { flex: 1; padding: 2rem; background: var(--gray-100); overflow-y: auto; }

/* ── Loading spinner ───────────────────────────────────────── */
.spinner {
  display: inline-block;
  width: 18px; height: 18px;
  border: 3px solid rgba(255,255,255,.35);
  border-top-color: var(--white);
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
.spinner-primary { border-color: rgba(0,51,102,.2); border-top-color: var(--primary); }
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Animations ────────────────────────────────────────────── */
@keyframes fadeInUp { from { opacity:0; transform:translateY(12px); } to { opacity:1; transform:translateY(0); } }
.fade-in { animation: fadeInUp .3s ease; }

/* ── Misc ──────────────────────────────────────────────────── */
.section-title {
  font-size: 1.15rem;
  color: var(--primary);
  margin-bottom: 1rem;
  padding-bottom: .4rem;
  border-bottom: 2px solid var(--accent);
  display: flex; align-items: center; gap: .5rem;
}

.empty-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--gray-500);
}
.empty-state i { font-size: 2.5rem; margin-bottom: .75rem; opacity: .4; }
.empty-state p  { font-size: .9rem; }

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--gray-100); }
::-webkit-scrollbar-thumb { background: var(--gray-400); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--gray-500); }

/* ══════════════════════════════════════════════════════════════
   RESPONSIVE
   ══════════════════════════════════════════════════════════════ */
@media (max-width: 992px) {
  .sidebar { width: 200px; }
  .learn-layout { grid-template-columns: 220px 1fr; }
}

@media (max-width: 768px) {
  .navbar-toggle { display: block; }
  .navbar-nav { display: none; position: absolute; top: 60px; left: 0; right: 0;
    background: var(--primary); flex-direction: column; padding: .75rem; box-shadow: var(--shadow); z-index: 99; }
  .navbar-nav.show { display: flex; }

  .app-layout { flex-direction: column; }
  .sidebar { width: 100%; }
  .sidebar-nav { display: flex; flex-direction: row; overflow-x: auto; }
  .sidebar-nav li a { border-left: none; border-bottom: 3px solid transparent; padding: .5rem .75rem; white-space: nowrap; }
  .sidebar-nav li a.active { border-left-color: transparent; border-bottom-color: var(--accent); }
  .sidebar-nav .nav-section { display: none; }
  .sidebar-user { display: none; }

  .main-content { padding: 1rem; }

  .learn-layout { grid-template-columns: 1fr; height: auto; }
  .learn-sidebar { max-height: 280px; }
  .learn-content { min-height: 60vh; }

  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .charts-grid { grid-template-columns: 1fr; }
  .result-stats-row { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 480px) {
  .auth-page { padding: 0; }
  .auth-card { border-radius: 0; min-height: 100vh; display: flex; flex-direction: column; }
  .auth-panel { flex: 1; }
  .category-cards { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr; }
  .quiz-header-bar { flex-wrap: wrap; }
  .result-stats-row { gap: .5rem; }
  .result-stat .rs-value { font-size: 1.2rem; }

  .modal-overlay { padding: 0; align-items: flex-end; }
  .modal {
    max-width: 100%;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    max-height: 92vh;
  }
  .modal-body { padding: 1rem; }
  .modal-header { padding: .9rem 1rem; }
  .modal-footer { padding: .75rem 1rem; }
}