/* ============================================
   ΙΕΚ QUIZ APP - COMPLETE STYLES
   Modern Professional Design
   ============================================ */

/* =========================
   CSS RESET & BASE
   ========================= */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  width: 100%;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica', 'Arial', sans-serif;
  background: #0b0b0b;
  color: #f2f6ff;
  line-height: 1.5;
}

/* =========================
   SCREEN MANAGEMENT
   ========================= */
.screen {
  display: none;
  width: 100%;
  min-height: 100vh;
}

.screen.is-active,
.screen.active {
  display: block;
}

/* =========================
   UTILITY CLASSES
   ========================= */
.is-hidden,
.hide {
  display: none !important;
}

[hidden] {
  display: none !important;
}

/* Prevent FOUC */
html:not(.js-ready) #paid-cats {
  visibility: hidden;
}

/* =========================
   LAYOUT UTILITIES
   ========================= */
.relative { position: relative; }
.absolute { position: absolute; }
.inset-0 { top: 0; right: 0; bottom: 0; left: 0; }
.overflow-hidden { overflow: hidden; }
.min-h-screen { min-height: 100vh; }

.flex { display: flex; }
.inline-block { display: inline-block; }
.grid { display: grid; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.flex-col { flex-direction: column; }
.flex-1 { flex: 1 1 0%; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 0.75rem; }
.gap-4 { gap: 1rem; }
.space-y-3 > * + * { margin-top: 0.75rem; }
.space-y-4 > * + * { margin-top: 1rem; }

.w-full { width: 100%; }
.w-4 { width: 1rem; }
.w-5 { width: 1.25rem; }
.w-6 { width: 1.5rem; }
.w-7 { width: 1.75rem; }
.w-10 { width: 2.5rem; }
.w-20 { width: 5rem; }
.w-96 { width: 24rem; }
.h-4 { height: 1rem; }
.h-5 { height: 1.25rem; }
.h-6 { height: 1.5rem; }
.h-7 { height: 1.75rem; }
.h-10 { height: 2.5rem; }
.h-20 { height: 5rem; }
.h-96 { height: 24rem; }
.h-full { height: 100%; }
.h-2\.5 { height: 0.625rem; }
.min-h-\[60px\] { min-height: 60px; }
.min-h-\[56px\] { min-height: 56px; }
.max-w-2xl { max-width: 42rem; }
.max-w-3xl { max-width: 48rem; }
.max-w-4xl { max-width: 56rem; }
.mx-auto { margin-left: auto; margin-right: auto; }

/* Spacing */
.p-1 { padding: 0.25rem; }
.p-3 { padding: 0.75rem; }
.p-4 { padding: 1rem; }
.p-5 { padding: 1.25rem; }
.p-6 { padding: 1.5rem; }
.p-8 { padding: 2rem; }
.px-1 { padding-left: 0.25rem; padding-right: 0.25rem; }
.px-3 { padding-left: 0.75rem; padding-right: 0.75rem; }
.px-4 { padding-left: 1rem; padding-right: 1rem; }
.px-5 { padding-left: 1.25rem; padding-right: 1.25rem; }
.px-6 { padding-left: 1.5rem; padding-right: 1.5rem; }
.px-8 { padding-left: 2rem; padding-right: 2rem; }
.py-1 { padding-top: 0.25rem; padding-bottom: 0.25rem; }
.py-1\.5 { padding-top: 0.375rem; padding-bottom: 0.375rem; }
.py-2 { padding-top: 0.5rem; padding-bottom: 0.5rem; }
.py-2\.5 { padding-top: 0.625rem; padding-bottom: 0.625rem; }
.py-3 { padding-top: 0.75rem; padding-bottom: 0.75rem; }
.py-4 { padding-top: 1rem; padding-bottom: 1rem; }
.py-12 { padding-top: 3rem; padding-bottom: 3rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-5 { margin-bottom: 1.25rem; }
.mb-6 { margin-bottom: 1.5rem; }
.mb-8 { margin-bottom: 2rem; }
.mb-12 { margin-bottom: 3rem; }
.mt-6 { margin-top: 1.5rem; }
.mt-8 { margin-top: 2rem; }

/* Border Radius */
.rounded-lg { border-radius: 0.5rem; }
.rounded-xl { border-radius: 0.75rem; }
.rounded-2xl { border-radius: 1rem; }
.rounded-full { border-radius: 9999px; }

/* Typography */
.text-xs { font-size: 0.75rem; line-height: 1rem; }
.text-sm { font-size: 0.875rem; line-height: 1.25rem; }
.text-base { font-size: 1rem; line-height: 1.5rem; }
.text-lg { font-size: 1.125rem; line-height: 1.75rem; }
.text-xl { font-size: 1.25rem; line-height: 1.75rem; }
.text-2xl { font-size: 1.5rem; line-height: 2rem; }
.text-3xl { font-size: 1.875rem; line-height: 2.25rem; }
.text-4xl { font-size: 2.25rem; line-height: 2.5rem; }
.text-5xl { font-size: 3rem; line-height: 1; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }
.font-extrabold { font-weight: 800; }
.font-black { font-weight: 900; }
.font-mono { font-family: ui-monospace, 'Cascadia Code', 'Source Code Pro', Menlo, Monaco, 'Courier New', monospace; }
.text-left { text-align: left; }
.text-center { text-align: center; }
.leading-tight { line-height: 1.25; }
.leading-relaxed { line-height: 1.625; }
.tracking-tight { letter-spacing: -0.025em; }
.tracking-wider { letter-spacing: 0.05em; }
.uppercase { text-transform: uppercase; }
.whitespace-nowrap { white-space: nowrap; }
.break-all { word-break: break-all; }

/* Colors */
.text-white { color: #ffffff; }
.text-slate-200 { color: #e2e8f0; }
.text-slate-300 { color: #cbd5e1; }
.text-slate-400 { color: #94a3b8; }
.text-slate-500 { color: #64748b; }
.text-slate-800 { color: #bcc4d8; }
.text-slate-900 { color: #bcc4d8; }
.text-sky-300 { color: #7dd3fc; }
.text-sky-400 { color: #38bdf8; }
.text-emerald-400 { color: #34d399; }
.text-rose-300 { color: #fda4af; }
.text-rose-400 { color: #fb7185; }
.text-transparent { color: transparent; }

/* Backgrounds */
.bg-white\/80 { background-color: rgba(251, 247, 247, 0.8/7%); }
.bg-slate-800\/30 { background-color: rgba(30, 41, 59, 0.3); }
.bg-slate-800\/50 { background-color: rgba(30, 41, 59, 0.5); }
.bg-slate-900\/50 { background-color: rgba(15, 23, 42, 0.5); }
.bg-slate-700\/40 { background-color: rgba(51, 65, 85, 0.4); }
.bg-slate-700\/50 { background-color: rgba(51, 65, 85, 0.5); }

/* Borders */
.border { border-width: 1px; }
.border-white\/10 { border-color: rgba(255, 255, 255, 0.1); }
.border-white\/20 { border-color: rgba(255, 255, 255, 0.2); }
.border-slate-700\/30 { border-color: rgba(51, 65, 85, 0.3); }
.border-slate-700\/40 { border-color: rgba(51, 65, 85, 0.4); }
.border-slate-700\/50 { border-color: rgba(51, 65, 85, 0.5); }
.border-slate-600\/50 { border-color: rgba(71, 85, 105, 0.5); }
.border-sky-500\/30 { border-color: rgba(14, 165, 233, 0.3); }
.border-emerald-500\/30 { border-color: rgba(16, 185, 129, 0.3); }
.border-rose-500\/30 { border-color: rgba(244, 63, 94, 0.3); }
.border-orange-200\/50 { border-color: rgba(254, 215, 170, 0.5); }

/* Shadows */
.shadow-lg { box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1); }
.shadow-2xl { box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25); }
.shadow-sky-500\/20 { box-shadow: 0 10px 15px -3px rgba(14, 165, 233, 0.2); }
.shadow-sky-500\/30 { box-shadow: 0 10px 15px -3px rgba(14, 165, 233, 0.3); }
.shadow-sky-500\/50 { box-shadow: 0 10px 15px -3px rgba(14, 165, 233, 0.5); }
.shadow-emerald-500\/20 { box-shadow: 0 10px 15px -3px rgba(16, 185, 129, 0.2); }
.shadow-emerald-500\/40 { box-shadow: 0 10px 15px -3px rgba(16, 185, 129, 0.4); }
.shadow-orange-500\/30 { box-shadow: 0 10px 15px -3px rgba(249, 115, 22, 0.3); }
.shadow-orange-500\/50 { box-shadow: 0 10px 15px -3px rgba(249, 115, 22, 0.5); }
.shadow-orange-900\/10 { box-shadow: 0 25px 50px -12px rgba(124, 45, 18, 0.1); }
.shadow-black\/20 { box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.2); }
.shadow-black\/30 { box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.3); }

/* Effects */
.backdrop-blur-sm { backdrop-filter: blur(4px); }
.backdrop-blur-md { backdrop-filter: blur(12px); }
.backdrop-blur-lg { backdrop-filter: blur(16px); }
.blur-3xl { filter: blur(64px); }

/* Transitions */
.transition-all { transition-property: all; transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1); transition-duration: 150ms; }
.transition-colors { transition-property: color, background-color, border-color; transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1); transition-duration: 150ms; }
.transition-transform { transition-property: transform; transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1); transition-duration: 150ms; }
.duration-200 { transition-duration: 200ms; }
.duration-300 { transition-duration: 300ms; }
.duration-500 { transition-duration: 500ms; }
.duration-700 { transition-duration: 700ms; }
.ease-out { transition-timing-function: cubic-bezier(0, 0, 0.2, 1); }

/* Shrink */
.shrink-0 { flex-shrink: 0; }

/* Focus */
.focus\:outline-none:focus { outline: 2px solid transparent; outline-offset: 2px; }
.focus\:ring-2:focus { box-shadow: 0 0 0 3px; }
.focus\:ring-sky-500:focus { box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.5); }
.focus\:ring-emerald-500:focus { box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.5); }
.focus\:border-transparent:focus { border-color: transparent; }

/* Group Hover */
.group:hover .group-hover\:text-slate-400 { color: #94a3b8; }
.group:hover .group-hover\:translate-x-\[100\%\] { transform: translateX(100%); }

/* Hover States */
.hover\:text-white:hover { color: #ffffff; }
.hover\:text-sky-300:hover { color: #7dd3fc; }
.hover\:text-rose-300:hover { color: #fda4af; }
.hover\:from-sky-400:hover { --tw-gradient-from: #38bdf8; }
.hover\:to-blue-500:hover { --tw-gradient-to: #3b82f6; }
.hover\:from-sky-400:hover { --tw-gradient-from: #38bdf8; }
.hover\:to-blue-500:hover { --tw-gradient-to: #3b82f6; }
.hover\:from-slate-700\/80:hover { background-image: linear-gradient(to bottom right, rgba(51, 65, 85, 0.8), var(--tw-gradient-to)); }
.hover\:to-slate-800\/80:hover { --tw-gradient-to: rgba(30, 41, 59, 0.8); }
.hover\:from-emerald-400:hover { --tw-gradient-from: #34d399; }
.hover\:to-emerald-500:hover { --tw-gradient-to: #10b981; }
.hover\:from-orange-400:hover { --tw-gradient-from: #fb923c; }
.hover\:to-amber-500:hover { --tw-gradient-to: #f59e0b; }
.hover\:bg-sky-500\/10:hover { background-color: rgba(14, 165, 233, 0.1); }
.hover\:bg-slate-700\/50:hover { background-color: rgba(51, 65, 85, 0.5); }
.hover\:bg-slate-800\/50:hover { background-color: rgba(30, 41, 59, 0.5); }
.hover\:bg-rose-500\/30:hover { background-color: rgba(244, 63, 94, 0.3); }
.hover\:border-slate-600\/50:hover { border-color: rgba(71, 85, 105, 0.5); }
.hover\:shadow-sky-500\/10:hover { box-shadow: 0 25px 50px -12px rgba(14, 165, 233, 0.1); }
.hover\:shadow-sky-500\/40:hover { box-shadow: 0 10px 15px -3px rgba(14, 165, 233, 0.4); }
.hover\:shadow-sky-500\/50:hover { box-shadow: 0 10px 15px -3px rgba(14, 165, 233, 0.5); }
.hover\:shadow-emerald-500\/40:hover { box-shadow: 0 10px 15px -3px rgba(16, 185, 129, 0.4); }
.hover\:shadow-orange-500\/50:hover { box-shadow: 0 10px 15px -3px rgba(249, 115, 22, 0.5); }
.hover\:scale-102:hover { transform: scale(1.02); }
.active\:scale-98:active { transform: scale(0.98); }

/* =========================
   GRADIENTS
   ========================= */
.bg-gradient-to-r { background-image: linear-gradient(to right, var(--tw-gradient-stops)); }
.bg-gradient-to-br { background-image: linear-gradient(to bottom right, var(--tw-gradient-stops)); }
.from-slate-950 { --tw-gradient-from: #020617; --tw-gradient-stops: var(--tw-gradient-from), var(--tw-gradient-to); }
.via-slate-900 { --tw-gradient-to: #0f172a; }
.to-slate-950 { --tw-gradient-to: #020617; }
.from-sky-500 { --tw-gradient-from: #0ea5e9; --tw-gradient-stops: var(--tw-gradient-from), var(--tw-gradient-to); }
.to-blue-600 { --tw-gradient-to: #2563eb; }
.from-sky-400 { --tw-gradient-from: #38bdf8; --tw-gradient-stops: var(--tw-gradient-from), var(--tw-gradient-to); }
.to-blue-500 { --tw-gradient-to: #3b82f6; }
.from-white\/10 { --tw-gradient-from: rgba(255, 255, 255, 0.1); --tw-gradient-stops: var(--tw-gradient-from), var(--tw-gradient-to); }
.to-white\/5 { --tw-gradient-to: rgba(255, 255, 255, 0.05); }
.from-slate-800\/80 { --tw-gradient-from: rgba(30, 41, 59, 0.8); --tw-gradient-stops: var(--tw-gradient-from), var(--tw-gradient-to); }
.to-slate-900\/80 { --tw-gradient-to: rgba(15, 23, 42, 0.5); }
.from-emerald-500 { --tw-gradient-from: #10b981; --tw-gradient-stops: var(--tw-gradient-from), var(--tw-gradient-to); }
.to-emerald-600 { --tw-gradient-to: #059669; }
.from-indigo-950 { --tw-gradient-from: #1e1b4b; --tw-gradient-stops: var(--tw-gradient-from), var(--tw-gradient-to); }
.via-slate-900 { --tw-gradient-to: #0f172a; }
.to-slate-950 { --tw-gradient-to: #020617; }
.from-sky-500\/20 { --tw-gradient-from: rgba(14, 165, 233, 0.2); --tw-gradient-stops: var(--tw-gradient-from), var(--tw-gradient-to); }
.to-blue-500\/20 { --tw-gradient-to: rgba(59, 130, 246, 0.2); }
.from-sky-500 { --tw-gradient-from: #0ea5e9; --tw-gradient-stops: var(--tw-gradient-from), var(--tw-gradient-to); }
.via-blue-500 { --tw-gradient-to: #3b82f6; }
.to-indigo-500 { --tw-gradient-to: #6366f1; }
.from-orange-50 { --tw-gradient-from: #fff7ed; --tw-gradient-stops: var(--tw-gradient-from), var(--tw-gradient-to); }
.via-amber-50 { --tw-gradient-to: #fffbeb; }
.to-yellow-50 { --tw-gradient-to: #fefce8; }
.from-orange-400 { --tw-gradient-from: #fb923c; --tw-gradient-stops: var(--tw-gradient-from), var(--tw-gradient-to); }
.to-amber-500 { --tw-gradient-to: #f59e0b; }
.from-orange-500 { --tw-gradient-from: #f97316; --tw-gradient-stops: var(--tw-gradient-from), var(--tw-gradient-to); }
.to-amber-600 { --tw-gradient-to: #d97706; }

/* Gradient Text */
.bg-clip-text { -webkit-background-clip: text; background-clip: text; }

/* Custom Radial Gradients */
.bg-radial-gradient-top-right {
  background-image: radial-gradient(ellipse at top right, rgba(192, 220, 233, 0.16), transparent);
}
.bg-radial-gradient-bottom-left {
  background-image: radial-gradient(ellipse at bottom left, rgba(192, 220, 233, 0.16), transparent);
}
.bg-radial-gradient-top {
  background-image: radial-gradient(ellipse at top, rgba(99, 102, 241, 0.2), transparent);
}
.bg-radial-gradient-tl-orange {
  background-image: radial-gradient(ellipse at top left, rgba(207, 143, 91, 0.303), transparent);
}
.bg-radial-gradient-br-amber {
  background-image: radial-gradient(ellipse at bottom right, rgba(207, 143, 91, 0.303), transparent);
}


/* Purple/Blue Glow Effects */
.bg-purple-500\/10 { background-color: rgba(168, 85, 247, 0.1); }
.bg-blue-500\/10 { background-color: rgba(59, 130, 246, 0.1); }

/* Grid */
.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }

/* Container */
.container {
  width: 100%;
  max-width: 100%;
  padding-left: 1rem;
  padding-right: 1rem;
}

/* Top positioning */
.top-0 { top: 0; }
.bottom-0 { bottom: 0; }
.left-1\/4 { left: 25%; }
.right-1\/4 { right: 25%; }

/* Translate */
.translate-x-\[-100\%\] { transform: translateX(-100%); }

/* =========================
   LOCK ICON VISIBILITY
   ========================= */
#paid-cats .lock-icon {
  display: none;
}

#paid-cats .btn-locked .lock-icon {
  display: inline-block;
}

/* Unlocked state */
#paid-cats .btn:not(.btn-locked) .lock-icon {
  display: none;
}

#paid-cats .btn:not(.btn-locked) {
  background: linear-gradient(135deg, #0ea5e9 0%, #2563eb 100%);
  border-color: rgba(37, 99, 235, 0.5);
  color: white;
  opacity: 1;
}

#paid-cats .btn:not(.btn-locked):hover {
  background: linear-gradient(135deg, #0284c7 0%, #1d4ed8 100%);
  transform: translateY(-1px);
  box-shadow: 0 10px 25px rgba(37, 99, 235, 0.25);
}

/* =========================
   LICENSE STATUS
   ========================= */
#licenseStatus:empty {
  display: none;
}

#licenseStatus.ok {
  color: #10b981;
  font-weight: 700;
}

#licenseStatus.bad {
  color: #ef4444;
  font-weight: 700;
}

/* Loading state for license buttons */
.license-btn:disabled,
.license-btn[aria-busy="true"] {
  position: relative;
  color: transparent;
  pointer-events: none;
}

.license-btn:disabled::after,
.license-btn[aria-busy="true"]::after {
  content: "";
  position: absolute;
  inset: 0;
  margin: auto;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* =========================
   QUIZ FEEDBACK STYLES
   ========================= */
#quiz #feedback.ok {
  background: rgba(34, 197, 94, 0.15);
  border-color: rgba(34, 197, 94, 0.35);
  color: #86efac;
  font-weight: 700;
}

#quiz #feedback.bad {
  background: rgba(239, 68, 68, 0.15);
  border-color: rgba(239, 68, 68, 0.35);
  color: #fca5a5;
  font-weight: 700;
}

/* =========================
   ANSWER BUTTON STATES
   ========================= */
.answer-btn {
  width: 100%;
  text-align: left;
  padding: 1rem 1.25rem;
  border-radius: 1rem;
  border: 2px solid rgba(148, 163, 184, 0.2);
  background: rgba(255, 255, 255, 0.95);
  color: #0f172a;
  font-weight: 600;
  line-height: 1.5;
  transition: all 0.2s ease;
  position: relative;
  overflow: hidden;
  cursor: pointer;
}

.answer-btn:hover:not(.disabled) {
  border-color: rgba(59, 130, 246, 0.5);
  background: rgba(255, 255, 255, 1);
  box-shadow: 0 8px 24px rgba(59, 130, 246, 0.12);
  transform: translateY(-2px);
}

.answer-btn:active:not(.disabled) {
  transform: translateY(0);
}

.answer-btn.disabled {
  opacity: 0.7;
  pointer-events: none;
}

.answer-btn.correct {
  border-color: rgba(34, 197, 94, 0.6);
  background: rgba(34, 197, 94, 0.12);
  color: #166534;
}

.answer-btn.wrong {
  border-color: rgba(239, 68, 68, 0.6);
  background: rgba(239, 68, 68, 0.12);
  color: #991b1b;
}

/* Check/Cross markers */
.answer-btn.correct::after {
  content: " ✓";
  float: right;
  color: #16a34a;
  font-weight: 900;
  font-size: 1.25rem;
}

.answer-btn.wrong::after {
  content: " ✕";
  float: right;
  color: #dc2626;
  font-weight: 900;
  font-size: 1.25rem;
}

/* =========================
   QUIZ CARD ANIMATIONS
   ========================= */
@keyframes fxPulseGreen {
  0% {
    box-shadow: 0 0 0 0 rgba(34, 197, 94, 0);
  }
  40% {
    box-shadow: 0 0 0 12px rgba(34, 197, 94, 0.25);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(34, 197, 94, 0);
  }
}

@keyframes fxShake {
  0%, 100% {
    transform: translateX(0);
  }
  20% {
    transform: translateX(-8px);
  }
  40% {
    transform: translateX(8px);
  }
  60% {
    transform: translateX(-6px);
  }
  80% {
    transform: translateX(6px);
  }
}

#quiz .card.fx-correct {
  animation: fxPulseGreen 500ms ease-out;
}

#quiz .card.fx-wrong {
  animation: fxShake 400ms ease-in-out;
}

/* Smooth transitions */
#quiz .card {
  transition: opacity 200ms ease, transform 200ms ease;
}

#quiz .card.is-fading {
  opacity: 0;
  transform: translateY(8px);
}

/* =========================
   NEXT BUTTON ANIMATION
   ========================= */
#btn-next {
  transform: scale(1);
  transition: transform 200ms ease, opacity 200ms ease;
}

#btn-next.is-hidden {
  opacity: 0;
  transform: scale(0.95);
  pointer-events: none;
}

#btn-next:not(.is-hidden) {
  opacity: 1;
  transform: scale(1);
}

/* =========================
   END SCREEN STYLES
   ========================= */
#end .stat-ok {
  color: #16a34a;
  font-weight: 800;
}

#end .stat-bad {
  color: #dc2626;
  font-weight: 800;
}

#end .stat-total {
  color: #0f172a;
  font-weight: 800;
}

#end .stat-note {
  color: #64748b;
  font-weight: 700;
}

/* PASS/FAIL styling */
#end #passfail.pass {
  color: #16a34a;
  font-weight: 900;
  letter-spacing: 0.05em;
  text-shadow: 0 2px 4px rgba(22, 163, 74, 0.2);
}

#end #passfail.fail {
  color: #dc2626;
  font-weight: 900;
  letter-spacing: 0.05em;
  text-shadow: 0 2px 4px rgba(220, 38, 38, 0.2);
}

/* =========================
   DISABLED BUTTON STATES
   ========================= */
button:disabled,
.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  filter: grayscale(30%);
}

/* =========================
   RESPONSIVE DESIGN
   ========================= */
@media (min-width: 640px) {
  /* SM */
  .sm\:text-base { font-size: 1rem; line-height: 1.5rem; }
  .sm\:text-lg { font-size: 1.125rem; line-height: 1.75rem; }
  .sm\:text-xl { font-size: 1.25rem; line-height: 1.75rem; }
  .sm\:text-2xl { font-size: 1.5rem; line-height: 2rem; }
  .sm\:text-3xl { font-size: 1.875rem; line-height: 2.25rem; }
  .sm\:text-4xl { font-size: 2.25rem; line-height: 2.5rem; }
  .sm\:flex-row { flex-direction: row; }
  .sm\:items-center { align-items: center; }
  .sm\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .sm\:p-5 { padding: 1.25rem; }
  .sm\:p-8 { padding: 2rem; }
  .sm\:p-12 { padding: 3rem; }
  .sm\:px-6 { padding-left: 1.5rem; padding-right: 1.5rem; }
}

@media (min-width: 1024px) {
  /* LG */
  .lg\:text-5xl { font-size: 3rem; line-height: 1; }
  .lg\:px-8 { padding-left: 2rem; padding-right: 2rem; }
}

@media (max-width: 640px) {
  .answer-btn {
    padding: 0.875rem 1rem;
    font-size: 0.9375rem;
  }
}

/* =========================
   SVG ICONS
   ========================= */
svg {
  display: inline-block;
  vertical-align: middle;
}

[aria-hidden="true"] {
  pointer-events: none;
}
/* Prevent flash before JS applies unlocked state */
html:not(.js-ready) #paid-cats .lock-icon { visibility: hidden; }

/* Desktop downscale: shrink the whole content block */
@media (min-width: 1024px) {
  #landing .container,
  #quiz .container {
    transform: scale(0.85);
    transform-origin: top center;
  }
}
#landing.bg-photo,
#end.bg-photo{
  background-image:
    linear-gradient(rgba(2,6,23,.78), rgba(2,6,23,.78)),
    url("assets/bg.jpg");
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}