/* ============================================================
   BAFA Energieberatung — Dark Glassmorphism UI
   Ukrainian Blue & Gold Palette
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* ── Variables ─────────────────────────────────────────── */
:root {
  --blue:       #005BBB;
  --blue-light: #0071E3;
  --blue-pale:  #60AAFF;
  --gold:       #FFD700;
  --gold-deep:  #FFC200;
  --gold-pale:  #FFF0A0;
  --bg:         #030D1F;
  --text:       #EEF4FF;
  --text-muted: rgba(238,244,255,0.55);
  --text-dim:   rgba(238,244,255,0.35);
  --glass-bg:   rgba(255,255,255,0.08);
  --glass-bg-hov: rgba(255,255,255,0.12);
  --glass-border: rgba(255,255,255,0.13);
  --glass-border-hov: rgba(255,255,255,0.22);
  --radius-sm:  12px;
  --radius-md:  18px;
  --radius-lg:  24px;
  --sidebar-w:  290px;
  --topbar-h:   64px;
  --transition: 0.22s cubic-bezier(0.4,0,0.2,1);
}

/* ── Light Theme ───────────────────────────────────────── */
[data-theme="light"] {
  --bg:              #F0F4FA;
  --text:            #0D1B2E;
  --text-muted:      rgba(13,27,46,0.55);
  --text-dim:        rgba(13,27,46,0.35);
  --glass-bg:        rgba(255,255,255,0.72);
  --glass-bg-hov:    rgba(255,255,255,0.88);
  --glass-border:    rgba(0,91,187,0.18);
  --glass-border-hov:rgba(0,91,187,0.35);
}

[data-theme="light"] body::before {
  background:
    radial-gradient(ellipse 80% 60% at 10% 5%,  rgba(0,91,187,0.12) 0%, transparent 65%),
    radial-gradient(ellipse 60% 50% at 88% 8%,  rgba(255,215,0,0.18) 0%, transparent 60%),
    radial-gradient(ellipse 70% 55% at 50% 105%, rgba(0,91,187,0.10) 0%, transparent 60%),
    radial-gradient(ellipse 55% 45% at 92% 85%,  rgba(255,215,0,0.12) 0%, transparent 55%),
    var(--bg);
}

[data-theme="light"] .sidebar {
  background: rgba(255,255,255,0.85);
  border-right-color: rgba(0,91,187,0.15);
  box-shadow: 2px 0 24px rgba(0,91,187,0.08);
}

[data-theme="light"] .topbar {
  background: rgba(240,244,250,0.85);
  border-bottom-color: rgba(0,91,187,0.12);
}

[data-theme="light"] .sidebar-nav a {
  color: var(--text);
}

[data-theme="light"] .sidebar-footer-btn {
  color: var(--text-muted);
}

[data-theme="light"] .sidebar-footer-btn:hover {
  color: var(--blue);
  background: rgba(0,91,187,0.08);
}

[data-theme="light"] .tab-btn {
  color: var(--text-muted);
}

[data-theme="light"] .tab-btn.active {
  color: var(--blue);
  background: rgba(0,91,187,0.10);
}

[data-theme="light"] .modal {
  background: rgba(240,244,250,0.97);
  border-color: rgba(0,91,187,0.18);
  box-shadow: 0 24px 80px rgba(0,0,0,0.18);
}

[data-theme="light"] .quiz-option {
  background: rgba(0,91,187,0.06);
  border-color: rgba(0,91,187,0.18);
  color: var(--text);
}

[data-theme="light"] .quiz-option:hover {
  background: rgba(0,91,187,0.12);
}

[data-theme="light"] .flashcard-front,
[data-theme="light"] .flashcard-back {
  background: rgba(255,255,255,0.92);
  border-color: rgba(0,91,187,0.18);
}

[data-theme="light"] input,
[data-theme="light"] select {
  background: rgba(255,255,255,0.9);
  color: var(--text);
  border-color: rgba(0,91,187,0.25);
}

[data-theme="light"] .sidebar-overlay {
  background: rgba(13,27,46,0.45);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 15px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* ── Background Orbs ───────────────────────────────────── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(ellipse 80% 60% at 10% 5%,  rgba(0,91,187,0.42) 0%, transparent 65%),
    radial-gradient(ellipse 60% 50% at 88% 8%,  rgba(255,215,0,0.22) 0%, transparent 60%),
    radial-gradient(ellipse 70% 55% at 50% 105%, rgba(0,91,187,0.35) 0%, transparent 60%),
    radial-gradient(ellipse 55% 45% at 92% 85%,  rgba(255,215,0,0.18) 0%, transparent 55%),
    radial-gradient(ellipse 90% 80% at 50% 50%,  rgba(0,13,40,0.6) 0%, transparent 100%),
    var(--bg);
  pointer-events: none;
}

/* ── Layout ────────────────────────────────────────────── */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(3,13,31,0.7);
  z-index: 40;
  backdrop-filter: blur(4px);
}
.sidebar-overlay.active { display: block; }

.sidebar {
  position: fixed;
  top: 0; left: 0;
  width: var(--sidebar-w);
  height: 100vh;
  z-index: 50;
  display: flex;
  flex-direction: column;
  background: rgba(3,13,31,0.75);
  backdrop-filter: blur(28px) saturate(1.4);
  -webkit-backdrop-filter: blur(28px) saturate(1.4);
  border-right: 1px solid var(--glass-border);
  transition: transform var(--transition);
}

.main-wrapper {
  margin-left: var(--sidebar-w);
  min-height: 100vh;
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
}

/* ── Sidebar Header ────────────────────────────────────── */
.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 20px 16px;
  border-bottom: 1px solid var(--glass-border);
  flex-shrink: 0;
}
.logo { display: flex; align-items: center; gap: 12px; }
.logo-icon {
  font-size: 26px;
  filter: drop-shadow(0 0 12px rgba(255,215,0,0.6));
}
.logo-title {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, var(--gold), var(--gold-pale), var(--gold));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.logo-sub {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 400;
}
.sidebar-controls { display: flex; gap: 4px; }

/* ── Sidebar Search ────────────────────────────────────── */
.sidebar-search {
  padding: 12px 16px;
  flex-shrink: 0;
}
.sidebar-search input {
  width: 100%;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 13px;
  font-family: inherit;
  padding: 9px 14px;
  outline: none;
  transition: border-color var(--transition), background var(--transition);
}
.sidebar-search input::placeholder { color: var(--text-dim); }
.sidebar-search input:focus {
  border-color: rgba(255,215,0,0.4);
  background: rgba(255,255,255,0.09);
}

/* ── Sidebar Progress ──────────────────────────────────── */
.sidebar-progress-wrap {
  padding: 4px 16px 12px;
  flex-shrink: 0;
}
.sidebar-progress-label {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: 6px;
}
.sidebar-progress-bar {
  height: 4px;
  background: rgba(255,255,255,0.1);
  border-radius: 99px;
  overflow: hidden;
}
.sidebar-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--blue), var(--gold));
  border-radius: 99px;
  width: 0%;
  transition: width 0.6s ease;
}

/* ── Sidebar Nav ───────────────────────────────────────── */
.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 4px 10px 10px;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.1) transparent;
}
.sidebar-nav::-webkit-scrollbar { width: 4px; }
.sidebar-nav::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.12); border-radius: 99px; }

.nav-section { margin-bottom: 4px; }

.nav-section-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  transition: all var(--transition);
  letter-spacing: 0.01em;
  position: relative;
  user-select: none;
}
.nav-section-header:hover {
  background: var(--glass-bg);
  color: var(--text);
}
.nav-section-header.active {
  background: rgba(0,91,187,0.18);
  color: var(--text);
  border-left: 3px solid var(--blue);
  padding-left: 9px;
}
.nav-section-header.active .nav-icon { filter: drop-shadow(0 0 6px rgba(0,113,227,0.7)); }
.nav-section-icon { font-size: 16px; flex-shrink: 0; }
.nav-section-label { flex: 1; line-height: 1.3; }
.nav-section-label small { display: block; font-weight: 400; font-size: 10px; color: var(--text-dim); }
.nav-section-badge {
  font-size: 10px;
  background: rgba(255,215,0,0.12);
  border: 1px solid rgba(255,215,0,0.3);
  color: var(--gold);
  border-radius: 99px;
  padding: 1px 7px;
  font-weight: 600;
}
.nav-section-progress-ring {
  width: 22px; height: 22px;
  flex-shrink: 0;
}

.nav-topics {
  display: none;
  padding: 2px 0 4px 36px;
  list-style: none;
}
.nav-section.open .nav-topics { display: block; }
.nav-topic-link {
  display: block;
  padding: 6px 12px;
  font-size: 12.5px;
  color: var(--text-muted);
  border-radius: 8px;
  cursor: pointer;
  transition: all var(--transition);
  border-left: 2px solid transparent;
}
.nav-topic-link:hover { color: var(--text); background: rgba(255,255,255,0.05); }
.nav-topic-link.active {
  color: var(--gold);
  border-left-color: var(--gold);
  background: rgba(255,215,0,0.06);
}

/* ── Sidebar Footer ────────────────────────────────────── */
.sidebar-footer {
  padding: 12px 10px;
  border-top: 1px solid var(--glass-border);
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex-shrink: 0;
}
.sidebar-footer-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 13px;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition);
  text-align: left;
}
.sidebar-footer-btn:hover { background: var(--glass-bg); color: var(--text); }

/* ── Top Bar ───────────────────────────────────────────── */
.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 32px;
  background: rgba(3,13,31,0.65);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid rgba(255,255,255,0.07);
}
.topbar .hamburger { display: none; }
.breadcrumb {
  flex: 1;
  font-size: 13px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}
.breadcrumb .sep { opacity: 0.4; }
.breadcrumb .current { color: var(--text); font-weight: 500; }
.topbar-actions { display: flex; gap: 6px; }

/* ── Buttons ───────────────────────────────────────────── */
.btn-icon {
  width: 38px; height: 38px;
  border-radius: 10px;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--text-muted);
  font-size: 16px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  flex-shrink: 0;
}
.btn-icon:hover {
  background: var(--glass-bg-hov);
  border-color: rgba(255,215,0,0.35);
  color: var(--text);
}

.btn-gold {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 22px;
  background: linear-gradient(135deg, var(--gold), var(--gold-deep));
  color: #1A1000;
  font-weight: 700;
  font-size: 14px;
  border: none;
  border-radius: 14px;
  cursor: pointer;
  box-shadow: 0 0 32px rgba(255,215,0,0.35);
  transition: all var(--transition);
  font-family: inherit;
  letter-spacing: -0.2px;
}
.btn-gold:hover {
  box-shadow: 0 0 50px rgba(255,215,0,0.55);
  transform: translateY(-2px);
}

.btn-blue {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 22px;
  background: linear-gradient(135deg, var(--blue), var(--blue-light));
  color: white;
  font-weight: 600;
  font-size: 14px;
  border: none;
  border-radius: 14px;
  cursor: pointer;
  box-shadow: 0 0 20px rgba(0,91,187,0.4);
  transition: all var(--transition);
  font-family: inherit;
}
.btn-blue:hover {
  box-shadow: 0 0 36px rgba(0,91,187,0.6);
  transform: translateY(-1px);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: transparent;
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 500;
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: 14px;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
}
.btn-outline:hover {
  border-color: rgba(255,215,0,0.45);
  color: var(--gold);
}

.btn-sm {
  padding: 7px 14px;
  font-size: 13px;
  border-radius: 10px;
}

/* ── Content Area ──────────────────────────────────────── */
.content-area {
  flex: 1;
  padding: 36px 40px;
  max-width: 1100px;
  width: 100%;
}

/* ── Glass Card ────────────────────────────────────────── */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(24px) saturate(1.3);
  -webkit-backdrop-filter: blur(24px) saturate(1.3);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition), background var(--transition);
}
.glass-card:hover {
  border-color: var(--glass-border-hov);
  background: rgba(255,255,255,0.10);
}

/* Ukrainian flag accent on card top */
.card-ua-accent {
  height: 3px;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--blue) 50%, var(--gold) 50%);
  margin-bottom: 0;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

/* ── Dashboard ─────────────────────────────────────────── */
.dashboard-hero {
  margin-bottom: 40px;
}
.dashboard-hero h1 {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 800;
  letter-spacing: -2.5px;
  line-height: 1.15;
  background: linear-gradient(135deg, var(--gold), var(--gold-pale), var(--gold));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 10px;
}
.dashboard-hero p {
  font-size: 16px;
  color: var(--text-muted);
  max-width: 600px;
}
.dashboard-hero p strong { color: var(--text); }

.dashboard-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-bottom: 32px;
}
.stat-card {
  padding: 20px 22px;
  border-radius: var(--radius-md);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(20px);
}
.stat-value {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -1.5px;
  background: linear-gradient(135deg, var(--gold), var(--gold-pale));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-label {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}

.sections-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 16px;
}
.section-card {
  padding: 24px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}
.section-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--blue) 50%, var(--gold) 50%);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}
.section-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 12px;
}
.section-card-icon {
  font-size: 28px;
  filter: drop-shadow(0 0 10px rgba(255,215,0,0.3));
}
.section-card-num {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-dim);
  letter-spacing: 1px;
  text-transform: uppercase;
}
.section-card h3 {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--text);
  margin-bottom: 3px;
}
.section-card h3 small {
  display: block;
  font-size: 12px;
  font-weight: 400;
  color: var(--text-muted);
  letter-spacing: 0;
  margin-top: 2px;
}
.section-card p {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 16px;
  line-height: 1.55;
}
.section-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.section-progress {
  flex: 1;
  margin-right: 12px;
}
.section-progress-bar {
  height: 4px;
  background: rgba(255,255,255,0.1);
  border-radius: 99px;
  overflow: hidden;
  margin-bottom: 4px;
}
.section-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--blue), var(--gold));
  border-radius: 99px;
  transition: width 0.5s ease;
}
.section-progress-text {
  font-size: 11px;
  color: var(--text-dim);
}
.section-topics-count {
  font-size: 12px;
  color: var(--text-muted);
  white-space: nowrap;
}

/* ── Section Page ──────────────────────────────────────── */
.section-page-header {
  margin-bottom: 28px;
}
.section-page-title {
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 800;
  letter-spacing: -2px;
  background: linear-gradient(135deg, var(--text), rgba(238,244,255,0.7));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 4px;
}
.section-page-subtitle {
  font-size: 14px;
  color: var(--text-muted);
}
.section-page-actions {
  display: flex;
  gap: 10px;
  margin-top: 16px;
  flex-wrap: wrap;
}

.section-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 20px;
  align-items: start;
}
.topics-list {
  position: sticky;
  top: calc(var(--topbar-h) + 20px);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 12px;
  backdrop-filter: blur(20px);
}
.topics-list-title {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-dim);
  padding: 4px 8px 10px;
}
.topic-list-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 10px;
  border-radius: 10px;
  font-size: 13px;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition);
  border-left: 2px solid transparent;
}
.topic-list-item:hover { background: rgba(255,255,255,0.05); color: var(--text); }
.topic-list-item.active {
  background: rgba(255,215,0,0.08);
  color: var(--gold);
  border-left-color: var(--gold);
}
.topic-list-check {
  width: 16px; height: 16px;
  border-radius: 50%;
  border: 1.5px solid rgba(255,255,255,0.2);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 9px;
}
.topic-list-check.done {
  background: rgba(255,215,0,0.2);
  border-color: var(--gold);
  color: var(--gold);
}

/* ── Topic Content ─────────────────────────────────────── */
.topic-card {
  padding: 28px 32px;
}
.topic-card-header {
  margin-bottom: 20px;
}
.topic-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  padding: 5px 12px;
  border-radius: 99px;
  background: rgba(0,91,187,0.16);
  border: 1px solid rgba(0,91,187,0.38);
  color: var(--blue-pale);
  margin-bottom: 12px;
}
.topic-badge .dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--blue-pale);
  box-shadow: 0 0 6px var(--blue-pale);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}
.topic-title {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -1px;
  color: var(--text);
  margin-bottom: 6px;
}
.topic-title-ua {
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 400;
}

/* ── Tabs ──────────────────────────────────────────────── */
.tabs {
  display: flex;
  gap: 4px;
  border-bottom: 1px solid var(--glass-border);
  margin-bottom: 24px;
  overflow-x: auto;
  padding-bottom: 0;
}
.tab-btn {
  padding: 10px 18px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  font-family: inherit;
  white-space: nowrap;
  transition: all var(--transition);
  margin-bottom: -1px;
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active {
  color: var(--gold);
  border-bottom-color: var(--gold);
}
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ── Theory Content ────────────────────────────────────── */
.bilingual-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}
.lang-block {
  padding: 20px;
  border-radius: var(--radius-md);
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--glass-border);
}
.lang-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.lang-label .flag { font-size: 14px; }
.lang-block p, .lang-block li {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
}
.lang-block strong { color: var(--text); }
.lang-block ul { padding-left: 18px; }
.lang-block li { margin-bottom: 4px; }

/* ── Formula Block ─────────────────────────────────────── */
.formula-block {
  background: rgba(0,91,187,0.1);
  border: 1px solid rgba(0,91,187,0.3);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin-bottom: 20px;
  font-family: 'Courier New', 'Consolas', monospace;
}
.formula-block .formula-title {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--blue-pale);
  margin-bottom: 12px;
  font-family: 'Inter', sans-serif;
}
.formula-main {
  font-size: 18px;
  color: var(--text);
  letter-spacing: 0.5px;
  line-height: 1.8;
  font-weight: 500;
}
.formula-vars {
  margin-top: 14px;
  border-top: 1px solid rgba(0,91,187,0.2);
  padding-top: 14px;
  font-family: 'Inter', sans-serif;
}
.formula-var {
  display: flex;
  gap: 10px;
  font-size: 13px;
  margin-bottom: 5px;
}
.formula-var .sym {
  color: var(--blue-pale);
  font-family: monospace;
  font-weight: 600;
  min-width: 80px;
  flex-shrink: 0;
}
.formula-var .desc { color: var(--text-muted); }

/* ── Example Block ─────────────────────────────────────── */
.example-block {
  background: rgba(255,215,0,0.06);
  border: 1px solid rgba(255,215,0,0.2);
  border-radius: var(--radius-md);
  padding: 22px 26px;
  margin-bottom: 20px;
}
.example-block .example-title {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 12px;
}
.example-block p, .example-block li {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
}
.example-block strong { color: var(--text); }
.example-block ul { padding-left: 18px; margin-top: 6px; }

/* ── Exam Values Table ─────────────────────────────────── */
.exam-values-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 10px;
  margin-bottom: 20px;
}
.exam-value-item {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 14px 16px;
  transition: all var(--transition);
}
.exam-value-item:hover {
  border-color: rgba(255,215,0,0.3);
  background: rgba(255,215,0,0.04);
}
.exam-value-label { font-size: 12px; color: var(--text-dim); margin-bottom: 4px; }
.exam-value-val {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--gold);
}
.exam-value-unit { font-size: 13px; font-weight: 400; color: var(--text-muted); }
.exam-value-note { font-size: 11px; color: var(--text-dim); margin-top: 3px; line-height: 1.4; }

/* ── Mark-as-done button ───────────────────────────────── */
.topic-done-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--glass-border);
}
.topic-done-btn button {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 12px;
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  border: 1px solid rgba(255,215,0,0.3);
  background: rgba(255,215,0,0.08);
  color: var(--gold);
}
.topic-done-btn button:hover { background: rgba(255,215,0,0.15); }
.topic-done-btn button.done {
  background: rgba(255,215,0,0.18);
  border-color: rgba(255,215,0,0.5);
}

/* ── Quiz Modal ────────────────────────────────────────── */
.quiz-progress {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 24px;
}
.quiz-progress-bar {
  flex: 1;
  height: 6px;
  background: rgba(255,255,255,0.1);
  border-radius: 99px;
  overflow: hidden;
}
.quiz-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--blue), var(--gold));
  border-radius: 99px;
  transition: width 0.4s ease;
}
.quiz-q-num {
  font-size: 13px;
  color: var(--text-muted);
  white-space: nowrap;
}

.quiz-question {
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
  line-height: 1.55;
  margin-bottom: 20px;
  letter-spacing: -0.3px;
}
.quiz-question-de {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 8px;
  font-style: italic;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
}
.quiz-option {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--glass-border);
  background: rgba(255,255,255,0.04);
  cursor: pointer;
  transition: all var(--transition);
  font-size: 14px;
  color: var(--text-muted);
  text-align: left;
  font-family: inherit;
  width: 100%;
}
.quiz-option:hover:not(:disabled) {
  border-color: rgba(255,215,0,0.35);
  background: rgba(255,215,0,0.05);
  color: var(--text);
}
.quiz-option.selected { border-color: rgba(0,91,187,0.5); background: rgba(0,91,187,0.12); color: var(--text); }
.quiz-option.correct { border-color: rgba(80,200,100,0.6); background: rgba(80,200,100,0.1); color: #A8F0B8; }
.quiz-option.wrong { border-color: rgba(220,70,70,0.5); background: rgba(220,70,70,0.08); color: #F0A8A8; }
.quiz-option-letter {
  width: 26px; height: 26px;
  border-radius: 50%;
  border: 1.5px solid currentColor;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 1px;
}
.quiz-option-text { line-height: 1.5; }

.quiz-explanation {
  margin-top: 16px;
  padding: 14px 18px;
  border-radius: var(--radius-md);
  background: rgba(255,215,0,0.07);
  border: 1px solid rgba(255,215,0,0.2);
  font-size: 13.5px;
  color: var(--text-muted);
  line-height: 1.6;
}
.quiz-explanation strong { color: var(--gold); }

.quiz-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 20px;
}

.quiz-result {
  text-align: center;
  padding: 24px 0;
}
.quiz-result-score {
  font-size: 64px;
  font-weight: 800;
  letter-spacing: -4px;
  background: linear-gradient(135deg, var(--gold), var(--gold-pale));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 8px;
}
.quiz-result-label { font-size: 18px; font-weight: 600; color: var(--text); margin-bottom: 6px; }
.quiz-result-sub { font-size: 14px; color: var(--text-muted); margin-bottom: 28px; }

/* ── Flashcards ────────────────────────────────────────── */
.flashcard-progress {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}
.flashcard-counter {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
}
.fc-progress-bar {
  flex: 1;
  height: 4px;
  background: rgba(255,255,255,0.1);
  border-radius: 99px;
  overflow: hidden;
}
.fc-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--blue), var(--gold));
  border-radius: 99px;
  transition: width 0.35s ease;
}

.flashcard-scene {
  perspective: 1000px;
  margin: 0 auto 24px;
  height: 220px;
  cursor: pointer;
}
.flashcard-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.5s cubic-bezier(0.4, 0.2, 0.2, 1);
}
.flashcard-scene.flipped .flashcard-inner { transform: rotateY(180deg); }

.flashcard-face {
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 28px 32px;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}
.flashcard-front {
  background: rgba(0,91,187,0.18);
  border: 1px solid rgba(0,91,187,0.4);
}
.flashcard-back {
  background: rgba(255,215,0,0.1);
  border: 1px solid rgba(255,215,0,0.35);
  transform: rotateY(180deg);
}
.flashcard-lang-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  opacity: 0.5;
  margin-bottom: 12px;
}
.flashcard-term {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.5px;
  text-align: center;
  line-height: 1.3;
}
.flashcard-front .flashcard-term { color: var(--text); }
.flashcard-back .flashcard-term { color: var(--gold); }
.flashcard-sub {
  font-size: 13px;
  color: var(--text-muted);
  text-align: center;
  margin-top: 8px;
}
.flashcard-hint {
  font-size: 12px;
  color: var(--text-dim);
  margin-top: 16px;
}

.flashcard-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
}
.fc-btn-wrong, .fc-btn-right {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  border-radius: 12px;
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
}
.fc-btn-wrong {
  background: rgba(220,70,70,0.12);
  border: 1px solid rgba(220,70,70,0.3);
  color: #F0A8A8;
}
.fc-btn-wrong:hover { background: rgba(220,70,70,0.2); }
.fc-btn-right {
  background: rgba(255,215,0,0.12);
  border: 1px solid rgba(255,215,0,0.35);
  color: var(--gold);
}
.fc-btn-right:hover { background: rgba(255,215,0,0.2); }

.fc-section-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}
.fc-filter-btn {
  padding: 5px 12px;
  border-radius: 99px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--text-muted);
  font-family: inherit;
  transition: all var(--transition);
}
.fc-filter-btn.active {
  background: rgba(255,215,0,0.12);
  border-color: rgba(255,215,0,0.4);
  color: var(--gold);
}

/* ── Calculators ───────────────────────────────────────── */
.calc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 14px;
  margin-bottom: 20px;
}
.calc-card {
  padding: 22px;
  border-radius: var(--radius-md);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  cursor: pointer;
  transition: all var(--transition);
}
.calc-card:hover {
  border-color: rgba(255,215,0,0.35);
  background: rgba(255,215,0,0.05);
}
.calc-card-icon { font-size: 24px; margin-bottom: 10px; }
.calc-card h4 { font-size: 15px; font-weight: 700; color: var(--text); margin-bottom: 4px; letter-spacing: -0.3px; }
.calc-card p { font-size: 12.5px; color: var(--text-muted); line-height: 1.5; }

.calc-form { padding: 4px 0; }
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 12px;
}
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.form-group.full { grid-column: 1 / -1; }
.form-label {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
}
.form-input {
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--glass-border);
  border-radius: 10px;
  color: var(--text);
  font-size: 14px;
  font-family: inherit;
  padding: 10px 14px;
  outline: none;
  transition: border-color var(--transition);
}
.form-input:focus { border-color: rgba(255,215,0,0.4); }
.form-input option { background: #0a1a30; }

.calc-result {
  margin-top: 16px;
  padding: 18px 22px;
  border-radius: var(--radius-md);
  background: rgba(0,91,187,0.12);
  border: 1px solid rgba(0,91,187,0.3);
}
.calc-result-label {
  font-size: 12px;
  color: var(--blue-pale);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 6px;
}
.calc-result-value {
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -1.5px;
  color: var(--gold);
  line-height: 1;
}
.calc-result-unit {
  font-size: 15px;
  font-weight: 400;
  color: var(--text-muted);
}
.calc-result-breakdown {
  margin-top: 12px;
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.7;
  border-top: 1px solid rgba(255,255,255,0.07);
  padding-top: 12px;
}
.calc-result-breakdown strong { color: var(--text); }

/* ── Glossary ──────────────────────────────────────────── */
.glossary-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}
.glossary-search-wrap {
  flex: 1;
  min-width: 200px;
}
.glossary-search {
  width: 100%;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  color: var(--text);
  font-size: 14px;
  font-family: inherit;
  padding: 11px 16px;
  outline: none;
  transition: border-color var(--transition);
}
.glossary-search:focus { border-color: rgba(255,215,0,0.4); }
.glossary-alpha {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: 16px;
}
.alpha-btn {
  width: 28px; height: 28px;
  border-radius: 7px;
  border: 1px solid var(--glass-border);
  background: transparent;
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}
.alpha-btn:hover, .alpha-btn.active {
  background: rgba(255,215,0,0.12);
  border-color: rgba(255,215,0,0.4);
  color: var(--gold);
}

.glossary-group { margin-bottom: 24px; }
.glossary-letter {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-dim);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--glass-border);
  margin-bottom: 10px;
}
.glossary-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  padding: 12px 16px;
  border-radius: 10px;
  border: 1px solid transparent;
  margin-bottom: 4px;
  transition: all var(--transition);
}
.glossary-item:hover {
  background: rgba(255,255,255,0.04);
  border-color: var(--glass-border);
}
.glossary-de {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}
.glossary-de span { font-size: 11px; color: var(--text-dim); font-weight: 400; display: block; }
.glossary-ua {
  font-size: 14px;
  color: var(--text-muted);
}
.glossary-category {
  display: inline-block;
  font-size: 10px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 99px;
  background: rgba(0,91,187,0.15);
  border: 1px solid rgba(0,91,187,0.3);
  color: var(--blue-pale);
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ── Weak Topics ───────────────────────────────────────── */
.weak-section-title {
  font-size: 26px;
  font-weight: 800;
  letter-spacing: -1.5px;
  margin-bottom: 6px;
  color: var(--text);
}
.weak-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 14px;
}
.weak-card {
  padding: 20px 22px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(220,100,100,0.25);
  background: rgba(220,100,100,0.06);
  cursor: pointer;
  transition: all var(--transition);
}
.weak-card:hover { border-color: rgba(220,100,100,0.45); background: rgba(220,100,100,0.10); }
.weak-card-title { font-size: 15px; font-weight: 700; color: var(--text); margin-bottom: 4px; }
.weak-card-sub { font-size: 12px; color: var(--text-muted); margin-bottom: 12px; }
.weak-card-bar {
  height: 4px;
  background: rgba(255,255,255,0.08);
  border-radius: 99px;
  overflow: hidden;
}
.weak-card-fill {
  height: 100%;
  background: linear-gradient(90deg, #E05555, #F08080);
  border-radius: 99px;
}
.weak-empty {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
}
.weak-empty .empty-icon { font-size: 48px; margin-bottom: 16px; }
.weak-empty h3 { font-size: 20px; font-weight: 700; color: var(--text); margin-bottom: 8px; }

/* ── Search overlay ────────────────────────────────────── */
.search-bar {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
}
.search-input-lg {
  flex: 1;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,215,0,0.3);
  border-radius: 14px;
  color: var(--text);
  font-size: 16px;
  font-family: inherit;
  padding: 14px 20px;
  outline: none;
}
.search-results { display: flex; flex-direction: column; gap: 8px; }
.search-result-item {
  padding: 14px 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  cursor: pointer;
  transition: all var(--transition);
}
.search-result-item:hover { border-color: rgba(255,215,0,0.3); background: rgba(255,215,0,0.05); }
.search-result-title { font-size: 15px; font-weight: 600; color: var(--text); margin-bottom: 3px; }
.search-result-section { font-size: 12px; color: var(--blue-pale); }
.search-result-snippet { font-size: 13px; color: var(--text-muted); margin-top: 4px; }
.search-result-snippet em { color: var(--gold); font-style: normal; font-weight: 600; }

/* ── Modal ─────────────────────────────────────────────── */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(3,13,31,0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 20px;
  align-items: flex-start;
  justify-content: center;
  overflow-y: auto;
}
.modal-overlay.active { display: flex; }
.modal {
  background: rgba(6,20,50,0.92);
  backdrop-filter: blur(32px);
  -webkit-backdrop-filter: blur(32px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 680px;
  margin: auto;
  box-shadow: 0 40px 80px rgba(0,0,0,0.5);
  overflow: hidden;
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 28px 18px;
  border-bottom: 1px solid var(--glass-border);
}
.modal-title {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--text);
}
.modal-close {
  width: 34px; height: 34px;
  border-radius: 9px;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--text-muted);
  font-size: 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}
.modal-close:hover { background: rgba(220,70,70,0.15); border-color: rgba(220,70,70,0.3); color: #F0A8A8; }
.modal-body { padding: 24px 28px 28px; }

/* ── Toast ─────────────────────────────────────────────── */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}
.toast {
  background: rgba(6,20,50,0.95);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 12px 18px;
  font-size: 14px;
  color: var(--text);
  backdrop-filter: blur(20px);
  animation: toastIn 0.25s ease;
  pointer-events: auto;
  max-width: 320px;
}
.toast.gold { border-color: rgba(255,215,0,0.4); }
.toast.blue { border-color: rgba(0,91,187,0.5); }
@keyframes toastIn {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes toastOut {
  from { opacity: 1; transform: translateY(0); }
  to   { opacity: 0; transform: translateY(-8px); }
}
.toast.leaving { animation: toastOut 0.2s ease forwards; }

/* ── Badges ────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: 99px;
  letter-spacing: 0.3px;
}
.badge-gold {
  background: rgba(255,215,0,0.12);
  border: 1px solid rgba(255,215,0,0.35);
  color: var(--gold);
}
.badge-blue {
  background: rgba(0,91,187,0.16);
  border: 1px solid rgba(0,91,187,0.38);
  color: var(--blue-pale);
}
.badge-green {
  background: rgba(80,200,100,0.12);
  border: 1px solid rgba(80,200,100,0.3);
  color: #A8F0B8;
}

/* ── Print styles ──────────────────────────────────────── */
@media print {
  body { background: white; color: black; }
  .sidebar, .topbar, .modal-overlay, .toast-container { display: none !important; }
  .main-wrapper { margin-left: 0; }
  .glass-card { background: white; border: 1px solid #ccc; border-radius: 8px; }
  .topic-title { color: #1a1a2e; }
  .formula-block { background: #f0f4ff; border-color: #3060a0; }
  .example-block { background: #fffbea; border-color: #c0a000; }
  .lang-block { background: #f8f8f8; border-color: #ddd; }
  .text { color: #1a1a2e; }
  .exam-value-val { color: #1a6010; }
  a { color: #1a1a2e; }
  .content-area { padding: 0; }
  .section-layout { grid-template-columns: 1fr; }
  .topics-list { display: none; }
  .bilingual-block { grid-template-columns: 1fr; }
}

/* ── Scrollbar global ──────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.12); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.2); }

/* ── Responsive ────────────────────────────────────────── */
@media (max-width: 900px) {
  .sidebar {
    transform: translateX(-100%);
  }
  .sidebar.open { transform: translateX(0); }
  .main-wrapper { margin-left: 0; }
  .topbar .hamburger { display: flex; }
  .dashboard-stats { grid-template-columns: repeat(2, 1fr); }
  .bilingual-block { grid-template-columns: 1fr; }
  .section-layout { grid-template-columns: 1fr; }
  .topics-list { position: static; }
  .content-area { padding: 20px 20px; }
  .form-row { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .dashboard-stats { grid-template-columns: 1fr 1fr; }
  .sections-grid { grid-template-columns: 1fr; }
  .modal { border-radius: 16px; }
  .content-area { padding: 16px; }
  .topic-card { padding: 20px 18px; }
  .modal-body { padding: 18px; }
  .modal-header { padding: 16px 18px 14px; }
}

/* ── Utilities ─────────────────────────────────────────── */
.text-gold {
  background: linear-gradient(135deg, var(--gold), var(--gold-pale));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.text-blue {
  background: linear-gradient(135deg, var(--blue-pale), #A0CCFF);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.divider-ua {
  height: 3px;
  background: linear-gradient(90deg, var(--blue) 50%, var(--gold) 50%);
  border-radius: 99px;
  margin: 24px 0;
}
.mt-0 { margin-top: 0; }
.mb-16 { margin-bottom: 16px; }
.hidden { display: none !important; }