/* ===== Design System / CSS Variables ===== */
/*
  Brand Colors & Type Scale
  -------------------------
  Primary: --color-primary (teal/cyan) - trust, focus, calm
  Accent: --color-accent (warm amber) - attention, CTAs
  Neutrals: Gray scale for text and surfaces
  
  Typography: Inter font with system fallback
  Contrast: All text meets WCAG AA (≥4.5:1 for normal text)
*/

/* Google Fonts - Inter with font-display: swap for performance */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
  /* === Colors === */
  /* Primary brand - teal/cyan for trust and focus */
  --color-primary: #3b9ece;
  --color-primary-light: #7fd4ff;
  --color-primary-dark: #2a7da8;
  --color-primary-rgb: 59, 158, 206;
  
  /* Accent - warm amber for attention */
  --color-accent: #f59e0b;
  --color-accent-light: #fbbf24;
  --color-accent-dark: #d97706;
  
  /* Success/Error states */
  --color-success: #10b981;
  --color-success-light: #34d399;
  --color-error: #ef4444;
  --color-error-light: #f87171;
  
  /* Neutral grays */
  --color-gray-50: #f8fafc;
  --color-gray-100: #f1f5f9;
  --color-gray-200: #e2e8f0;
  --color-gray-300: #cbd5e1;
  --color-gray-400: #94a3b8;
  --color-gray-500: #64748b;
  --color-gray-600: #475569;
  --color-gray-700: #334155;
  --color-gray-800: #1e293b;
  --color-gray-900: #0f172a;
  
  /* Surface colors */
  --color-surface: #0a0d14;
  --color-surface-elevated: #111827;
  --color-surface-card: rgba(17, 24, 39, 0.95);
  
  /* Text colors - WCAG AA compliant */
  --color-text-primary: #f1f5f9;    /* Contrast: 15.4:1 on dark bg */
  --color-text-secondary: #cbd5e1;  /* Contrast: 9.7:1 on dark bg */
  --color-text-muted: #94a3b8;      /* Contrast: 5.4:1 on dark bg */
  
  /* === Typography === */
  --font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  
  /* Type scale (1.25 ratio) */
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 1.875rem;  /* 30px */
  --font-size-4xl: 2.25rem;   /* 36px */
  
  /* Line heights */
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  
  /* Font weights */
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* === Spacing === */
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.25rem;   /* 20px */
  --space-6: 1.5rem;    /* 24px */
  --space-7: 1.75rem;   /* 28px */
  --space-8: 2rem;      /* 32px */
  --space-10: 2.5rem;   /* 40px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */
  
  /* === Border Radius === */
  --radius-sm: 0.375rem;  /* 6px */
  --radius-md: 0.5rem;    /* 8px */
  --radius-lg: 0.75rem;   /* 12px */
  --radius-xl: 1rem;      /* 16px */
  --radius-2xl: 1.25rem;  /* 20px */
  --radius-full: 9999px;
  
  /* === Shadows === */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 20px rgba(var(--color-primary-rgb), 0.4);
  --shadow-glow-strong: 0 0 30px rgba(var(--color-primary-rgb), 0.6);
  
  /* === Transitions === */
  --transition-fast: 0.1s ease-out;
  --transition-base: 0.15s ease-out;
  --transition-slow: 0.3s ease-out;
  
  /* === Layout === */
  --max-width-content: 960px;
  --touch-target-min-height: 44px;
  
  /* === Focus ring for accessibility === */
  --focus-ring: 0 0 0 3px rgba(var(--color-primary-rgb), 0.5);
}

/* ===== Base reset ===== */

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

html, body {
  height: 100%;
  font-family: var(--font-family);
  background: var(--color-surface);
  color: var(--color-text-primary);
}

body {
  line-height: var(--line-height-normal);
  font-size: var(--font-size-base);
}

a {
  color: var(--color-primary-light);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

/* === Skip to content link for accessibility === */
.skip-to-content {
  position: absolute;
  left: -9999px;
  top: var(--space-4);
  z-index: 9999;
  padding: var(--space-3) var(--space-4);
  background: var(--color-primary);
  color: var(--color-gray-900);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-md);
  text-decoration: none;
}

.skip-to-content:focus {
  left: var(--space-4);
  outline: none;
  box-shadow: var(--focus-ring);
}

/* === Global focus styles for accessibility === */
:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

/* Remove default focus for mouse users */
:focus:not(:focus-visible) {
  outline: none;
  box-shadow: none;
}

/* === Screen reader only utility === */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ===== Header / banner ===== */
.site-header {
  position: relative;
  padding: var(--space-8) var(--space-6) var(--space-6);
  background-image:
    linear-gradient(to bottom, rgba(0,0,0,0.45), rgba(0,0,0,0.65)),
    url("banner-creation-of-adam.jpg");
  background-size: cover;
  background-position: center 30%;
  background-repeat: no-repeat;
  color: var(--color-text-primary);
  overflow: hidden;
  box-shadow: var(--shadow-xl), 0 0 40px rgba(var(--color-primary-rgb), 0.15);
  z-index: 10;
  transform-style: preserve-3d;
  will-change: transform;
  border-bottom: 1px solid rgba(var(--color-primary-rgb), 0.25);
}

.site-header--hero {
  padding-top: var(--space-16);
  padding-bottom: var(--space-16);
  min-height: 280px;
  background-image:
    linear-gradient(to bottom, rgba(0,0,0,0.35), rgba(0,0,0,0.55)),
    url("banner-creation-of-adam.jpg");
}

.header-fog,
.header-particles,
.header-stars,
.header-rays {
  position: absolute;
  inset: 0;
  pointer-events: none;
  mix-blend-mode: screen;
}

.header-fog {
  opacity: 0.45;
  background:
    radial-gradient(circle at 0 0, rgba(255,255,255,0.15), transparent 55%),
    radial-gradient(circle at 100% 0, rgba(127,212,255,0.25), transparent 60%),
    radial-gradient(circle at 50% 100%, rgba(70,255,178,0.12), transparent 50%);
  animation: fogDrift 20s ease-in-out infinite alternate;
}

@keyframes fogDrift {
  0% { opacity: 0.35; transform: scale(1) translateX(0); }
  50% { opacity: 0.55; transform: scale(1.05) translateX(2%); }
  100% { opacity: 0.4; transform: scale(1) translateX(-2%); }
}

.header-particles {
  opacity: 0.5;
  background-image:
    radial-gradient(circle, rgba(127,212,255,0.5) 0, transparent 55%);
  background-size: 260% 260%;
  animation: headerGlow 14s ease-in-out infinite alternate;
}

/* Floating light orbs effect */
.header-particles::before {
  content: "";
  position: absolute;
  width: 100%;
  height: 100%;
  background-image:
    radial-gradient(2px 2px at 20% 30%, rgba(255,255,255,0.8), transparent),
    radial-gradient(3px 3px at 80% 20%, rgba(127,212,255,0.9), transparent),
    radial-gradient(2px 2px at 40% 70%, rgba(70,255,178,0.8), transparent),
    radial-gradient(3px 3px at 90% 60%, rgba(255,255,255,0.7), transparent),
    radial-gradient(2px 2px at 10% 80%, rgba(127,212,255,0.8), transparent),
    radial-gradient(3px 3px at 60% 40%, rgba(255,255,255,0.6), transparent),
    radial-gradient(2px 2px at 30% 50%, rgba(70,255,178,0.7), transparent),
    radial-gradient(2px 2px at 70% 85%, rgba(127,212,255,0.8), transparent);
  animation: floatingStars 8s ease-in-out infinite;
}

@keyframes floatingStars {
  0%, 100% { opacity: 0.6; transform: translateY(0); }
  50% { opacity: 1; transform: translateY(-5px); }
}

/* Light rays emanating from center */
.header-particles::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 200%;
  height: 200%;
  transform: translate(-50%, -50%);
  background: conic-gradient(
    from 0deg,
    transparent 0deg,
    rgba(127,212,255,0.08) 15deg,
    transparent 30deg,
    transparent 90deg,
    rgba(70,255,178,0.06) 105deg,
    transparent 120deg,
    transparent 180deg,
    rgba(255,255,255,0.05) 195deg,
    transparent 210deg,
    transparent 270deg,
    rgba(127,212,255,0.08) 285deg,
    transparent 300deg,
    transparent 360deg
  );
  opacity: 0;
  animation: raysRotate 30s linear infinite, raysPulse 4s ease-in-out infinite;
}

@keyframes raysRotate {
  from { transform: translate(-50%, -50%) rotate(0deg); }
  to { transform: translate(-50%, -50%) rotate(360deg); }
}

@keyframes raysPulse {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 0.6; }
}

@keyframes headerGlow {
  0%   { transform: translate3d(-6%, 0, 0); opacity: 0.35; }
  50%  { transform: translate3d(4%, 2%, 0); opacity: 0.55; }
  100% { transform: translate3d(8%, -2%, 0); opacity: 0.35; }
}

.header-content {
  position: relative;
  max-width: var(--max-width-content);
  margin: 0 auto;
  text-shadow: 0 2px 20px rgba(0,0,0,0.9), 0 0 40px rgba(0,0,0,0.7);
  transform: translateZ(40px);
}

.header-content h1 {
  font-size: var(--font-size-2xl);
  letter-spacing: 0.06em;
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
  background: linear-gradient(135deg, #ffffff 0%, var(--color-primary-light) 50%, #ffffff 100%);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 12px rgba(var(--color-primary-rgb), 0.5));
  animation: titleGradient 8s ease-in-out infinite;
}

@keyframes titleGradient {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.header-content p {
  margin-top: var(--space-2);
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  text-shadow: 0 1px 8px rgba(0,0,0,0.8);
  line-height: var(--line-height-relaxed);
}

/* Header subtitle - used for section labels above main title */
.header-subtitle {
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  opacity: 0.9;
  margin-bottom: var(--space-2);
}

/* Tips section styling */
.tips-section {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
  align-items: start;
}

.tips-card {
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface-elevated);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-gray-700);
}

.tips-card h3 {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.tips-card ul {
  margin: 0;
  padding-left: var(--space-5);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

/* Tip callout banner */
.tip-callout {
  margin-top: var(--space-6);
  padding: var(--space-4);
  background: rgba(var(--color-primary-rgb), 0.1);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(var(--color-primary-rgb), 0.3);
}

.tip-callout p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin: 0;
}

.tip-callout strong {
  color: var(--color-primary-light);
}

/* Site footer */
.site-footer {
  max-width: var(--max-width-content);
  margin: 0 auto var(--space-6);
  padding: 0 var(--space-6);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* glossy sweep across title */
.header-content h1::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 0%, rgba(255,255,255,0.3) 40%, transparent 80%);
  transform: translateX(-120%);
  opacity: 0;
  pointer-events: none;
  animation: titleSweep 18s ease-in-out infinite;
}

@keyframes titleSweep {
  0% { transform: translateX(-120%); opacity: 0; }
  5% { opacity: 1; }
  15% { transform: translateX(120%); opacity: 0; }
  100% { transform: translateX(120%); opacity: 0; }
}

/* ===== Progress bar ===== */
.exam-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 999;
  padding: var(--space-3) var(--space-6);
  background: rgba(10, 13, 20, 0.98);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(var(--color-primary-rgb), 0.35);
  display: flex;
  align-items: center;
  gap: var(--space-4);
  box-shadow: var(--shadow-lg);
}

.exam-progress-bar {
  flex: 1;
  height: 10px;
  border-radius: var(--radius-full);
  background: var(--color-gray-800);
  overflow: hidden;
  position: relative;
  box-shadow: inset 0 1px 3px rgba(0,0,0,0.4);
}

.exam-progress-fill {
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--color-success), var(--color-primary-light), var(--color-primary));
  box-shadow: 0 0 16px rgba(var(--color-primary-rgb), 0.9);
  transition: width var(--transition-base);
}

.exam-progress-bar::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent, rgba(255,255,255,0.4), transparent);
  transform: translateX(-100%);
  opacity: 0;
  pointer-events: none;
}

.exam-progress-bar.progress-animate::after {
  opacity: 1;
  animation: progressSheen 0.8s ease-out;
}

@keyframes progressSheen {
  from { transform: translateX(-100%); opacity: 0; }
  30% { opacity: 1; }
  to { transform: translateX(100%); opacity: 0; }
}

.exam-progress-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
  font-weight: var(--font-weight-medium);
}

/* ===== Exam Timer ===== */
.exam-timer {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: rgba(var(--color-primary-rgb), 0.15);
  border-radius: var(--radius-full);
  border: 1px solid rgba(var(--color-primary-rgb), 0.3);
  transition: all var(--transition-base);
}

.exam-timer .timer-icon {
  font-size: var(--font-size-base);
}

.exam-timer .timer-text {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  font-variant-numeric: tabular-nums;
  color: var(--color-text-primary);
  min-width: 48px;
  text-align: center;
}

/* Warning state - less than 2 minutes */
.exam-timer.timer-warning {
  background: rgba(245, 158, 11, 0.2);
  border-color: var(--color-accent);
  animation: timerPulse 1s ease-in-out infinite;
}

.exam-timer.timer-warning .timer-text {
  color: var(--color-accent-light);
}

/* Critical state - less than 30 seconds */
.exam-timer.timer-critical {
  background: rgba(239, 68, 68, 0.25);
  border-color: var(--color-error);
  animation: timerPulseCritical 0.5s ease-in-out infinite;
}

.exam-timer.timer-critical .timer-text {
  color: var(--color-error-light);
}

@keyframes timerPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.02); }
}

@keyframes timerPulseCritical {
  0%, 100% { transform: scale(1); box-shadow: 0 0 10px rgba(239, 68, 68, 0.5); }
  50% { transform: scale(1.05); box-shadow: 0 0 20px rgba(239, 68, 68, 0.8); }
}

/* Cancel Test Button */
.exam-cancel-btn {
  padding: var(--space-2) var(--space-3);
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.4);
  border-radius: var(--border-radius);
  color: var(--color-error-light);
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.exam-cancel-btn:hover {
  background: rgba(239, 68, 68, 0.25);
  border-color: var(--color-error);
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(239, 68, 68, 0.3);
}

.exam-cancel-btn:active {
  transform: translateY(0);
  box-shadow: 0 1px 4px rgba(239, 68, 68, 0.2);
}

/* ===== Main layout wrappers ===== */
.module-index-wrapper,
.exam-index-wrapper,
.page-content {
  max-width: var(--max-width-content);
  margin: 0 auto;
}

.module-index-wrapper,
.exam-index-wrapper {
  padding: var(--space-6) var(--space-6) var(--space-12);
}

.page-content {
  padding: var(--space-12) var(--space-6) var(--space-12);
}

.back-link {
  margin-bottom: var(--space-4);
  font-size: var(--font-size-sm);
}

.back-link a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.back-link a:hover {
  color: var(--color-primary-light);
  text-decoration: none;
}

.quiz-page-header,
.exam-index-header,
.module-index-header {
  margin-bottom: var(--space-6);
}

.quiz-page-header h2,
.exam-index-header h2,
.module-index-header h2 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-2);
  color: var(--color-text-primary);
}

.quiz-page-header p,
.exam-index-header p,
.module-index-header p {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

/* ===== Exam form & questions ===== */
.exam-form {
  margin-top: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

/* Question card - clear, readable, with visual hierarchy */
.question {
  padding: var(--space-5) var(--space-6);
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, rgba(17, 24, 39, 0.95), rgba(10, 13, 20, 0.98));
  border: 1px solid var(--color-gray-700);
  box-shadow: var(--shadow-md);
  transition: box-shadow var(--transition-base), border-color var(--transition-base), transform var(--transition-fast);
}

.question:hover {
  transform: translateY(-2px);
  border-color: rgba(var(--color-primary-rgb), 0.5);
  box-shadow: var(--shadow-lg), 0 0 20px rgba(var(--color-primary-rgb), 0.15);
}

/* Question text - larger and more readable */
.question p {
  margin-bottom: var(--space-4);
  font-size: var(--font-size-base);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-primary);
}

.question p strong {
  font-weight: var(--font-weight-semibold);
}

/* Answer options - larger click targets */
.question label {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: var(--font-size-base);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  cursor: pointer;
  min-height: var(--touch-target-min-height);
  border: 1px solid transparent;
  transition: all var(--transition-fast);
  color: var(--color-text-secondary);
}

.question label:hover {
  background: rgba(var(--color-primary-rgb), 0.1);
  border-color: rgba(var(--color-primary-rgb), 0.3);
  color: var(--color-text-primary);
}

.question label + label {
  margin-top: var(--space-2);
}

.question input[type="radio"] {
  margin-top: 0.2rem;
  margin-right: var(--space-2);
  accent-color: var(--color-primary-light);
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* answered state */
.question.answered {
  box-shadow: var(--shadow-glow);
  border-color: rgba(var(--color-primary-rgb), 0.7);
}

/* highlight selected option (browsers w/ :has support) */
.question label:has(input[type="radio"]:checked) {
  background: rgba(var(--color-primary-rgb), 0.2);
  color: var(--color-text-primary);
  border-color: rgba(var(--color-primary-rgb), 0.5);
  box-shadow: 0 0 12px rgba(var(--color-primary-rgb), 0.4);
}

/* Correct / incorrect after submit */
.question.correct {
  border-color: var(--color-success);
  box-shadow: 0 0 20px rgba(16, 185, 129, 0.6);
}

.question.incorrect {
  border-color: var(--color-error);
  box-shadow: 0 0 20px rgba(239, 68, 68, 0.6);
}

.question.label-correct label.correct {
  background: rgba(16, 185, 129, 0.2);
  color: var(--color-success-light);
  border-color: var(--color-success);
}

.question.label-incorrect label.incorrect {
  background: rgba(239, 68, 68, 0.2);
  color: var(--color-error-light);
  border-color: var(--color-error);
}

.question label.correct {
  background: rgba(16, 185, 129, 0.2);
  color: var(--color-success-light);
  border-color: var(--color-success);
}

.question label.incorrect {
  background: rgba(239, 68, 68, 0.2);
  color: var(--color-error-light);
  border-color: var(--color-error);
}

/* review mode: gently dim all others */
body.review-mode .question {
  opacity: 0.4;
}

body.review-mode .question.incorrect,
body.review-mode .question.correct {
  opacity: 1;
}

/* ===== Exam actions / buttons ===== */
.exam-actions {
  margin-top: var(--space-6);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-4);
}

/* Primary button - clear CTA, 44-48px height */
.exam-button {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  min-height: 48px;
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--color-gray-900);
  background: linear-gradient(135deg, var(--color-success) 0%, var(--color-primary-light) 50%, var(--color-primary) 100%);
  box-shadow: var(--shadow-glow), var(--shadow-md);
  transition: transform var(--transition-fast), box-shadow var(--transition-base);
}

.exam-button.secondary {
  background: linear-gradient(135deg, var(--color-gray-400) 0%, var(--color-primary-light) 50%, var(--color-primary) 100%);
}

.exam-button.retry {
  background: linear-gradient(135deg, #f39c12 0%, #e67e22 50%, #d35400 100%);
}

.exam-button.ghost {
  background: transparent;
  color: var(--color-text-primary);
  border: 2px solid rgba(var(--color-primary-rgb), 0.5);
  box-shadow: none;
}

.exam-button.ghost:hover {
  border-color: var(--color-primary-light);
  background: rgba(var(--color-primary-rgb), 0.1);
}

.exam-button:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: var(--shadow-glow-strong), var(--shadow-lg);
  animation: pulse-shadow 2s ease-in-out 3;
}

@keyframes pulse-shadow {
  0%, 100% {
    box-shadow: var(--shadow-glow-strong), var(--shadow-lg);
  }
  50% {
    box-shadow: 0 0 25px 5px rgba(var(--color-primary-rgb), 0.6), var(--shadow-xl);
  }
}

.exam-button:active {
  transform: translateY(0) scale(0.98);
  box-shadow: var(--shadow-sm);
}

.exam-button:focus-visible {
  box-shadow: var(--focus-ring), var(--shadow-glow);
}

.exam-button .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-gray-900);
}

/* Disabled button state */
.exam-button.disabled,
.exam-button:disabled {
  background: var(--color-gray-600);
  box-shadow: none;
  cursor: not-allowed;
  opacity: 0.5;
  pointer-events: none;
}

.exam-button.disabled:hover,
.exam-button:disabled:hover {
  transform: none;
  box-shadow: none;
}

/* Top actions container styling */
.exam-actions-top {
  margin-bottom: var(--space-6);
}

.result-banner {
  margin-top: var(--space-6);
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.15), rgba(var(--color-primary-rgb), 0.12));
  border: 2px solid rgba(var(--color-primary-rgb), 0.5);
  color: var(--color-text-primary);
  font-size: var(--font-size-base);
  display: none;
  box-shadow: var(--shadow-glow), var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.result-banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
  transform: translateX(-100%);
  animation: resultShimmer 3s ease-in-out infinite;
}

@keyframes resultShimmer {
  0%, 100% { transform: translateX(-100%); }
  50% { transform: translateX(100%); }
}

.result-banner.visible {
  display: block;
  animation: bannerSlideIn 0.3s ease-out;
}

/* Top result banner specific styles */
.result-banner-top {
  margin-top: 0;
  margin-bottom: var(--space-4);
}

@keyframes bannerSlideIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.result-banner strong {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  background: linear-gradient(135deg, var(--color-success), var(--color-primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ===== Loading overlay (optional) ===== */
#loading-overlay {
  position: fixed;
  inset: 0;
  background: var(--color-surface);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1200;
}

#loading-overlay .spinner {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 3px solid rgba(var(--color-primary-rgb), 0.3);
  border-top-color: var(--color-primary-light);
  animation: spin 0.8s linear infinite;
}

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

/* ===== Index grids ===== */
.module-grid,
.exam-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-4);
}

/* Card component - module and exam cards */
.module-card,
.exam-card {
  display: block;
  padding: var(--space-5) var(--space-6);
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, var(--color-surface-elevated), var(--color-surface));
  border: 1px solid var(--color-gray-700);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  box-shadow: var(--shadow-md);
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

/* Shimmer effect on hover */
.module-card::before,
.exam-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(var(--color-primary-rgb), 0.1),
    transparent
  );
  transition: left 0.5s ease-in-out;
}

.module-card:hover,
.exam-card:hover {
  transform: translateY(-4px) scale(1.02);
  border-color: rgba(var(--color-primary-rgb), 0.6);
  box-shadow: var(--shadow-xl), var(--shadow-glow);
  text-decoration: none;
}

.module-card:hover::before,
.exam-card:hover::before {
  left: 100%;
}

.module-card:focus-visible,
.exam-card:focus-visible {
  box-shadow: var(--focus-ring), var(--shadow-lg);
}

.module-card h3,
.exam-card h3 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-2);
  color: var(--color-text-primary);
}

.module-card p,
.exam-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

.module-last-score {
  margin-top: var(--space-3);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

/* ===== Wolf Pack watermark ===== */
body::after {
  content: "Wolf Pack Training";
  position: fixed;
  bottom: 6%;
  right: -8%;
  font-size: 2.4rem;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: rgba(var(--color-primary-rgb), 0.04);
  transform: rotate(-15deg);
  pointer-events: none;
  z-index: 0;
}

/* ===== Responsive tweaks ===== */
@media (max-width: 640px) {
  .site-header {
    padding: var(--space-10) var(--space-4) var(--space-8);
    width: 100%;
    margin: 0;
    background-size: cover; /* Ensure background covers full width */
  }

  .site-header--hero {
    min-height: 200px;
    padding-top: var(--space-10);
    padding-bottom: var(--space-10);
  }

  .header-content h1 {
    font-size: var(--font-size-xl);
    letter-spacing: 0.04em;
  }

  .header-content p {
    font-size: var(--font-size-sm);
  }

  .module-index-wrapper,
  .exam-index-wrapper,
  .page-content {
    padding: var(--space-8) var(--space-4) var(--space-8);
  }

  .exam-progress {
    padding: var(--space-2) var(--space-4);
    gap: var(--space-3);
  }

  .exam-progress-text {
    font-size: var(--font-size-xs);
  }

  .exam-progress-bar {
    height: 8px;
  }

  /* Timer mobile optimization */
  .exam-timer {
    padding: var(--space-1) var(--space-2);
  }

  .exam-timer .timer-icon {
    font-size: var(--font-size-sm);
  }

  .exam-timer .timer-text {
    font-size: var(--font-size-xs);
    min-width: 40px;
  }

  /* Question cards mobile optimization */
  .question {
    padding: var(--space-4);
    border-radius: var(--radius-lg);
  }

  .question p {
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-3);
  }

  .question label {
    font-size: var(--font-size-sm);
    padding: var(--space-3);
    border-radius: var(--radius-md);
  }

  /* Buttons mobile optimization */
  .exam-actions {
    flex-direction: column;
    gap: var(--space-3);
  }

  .exam-button {
    width: 100%;
    justify-content: center;
    padding: var(--space-3) var(--space-5);
    font-size: var(--font-size-sm);
  }

  /* Result banner mobile optimization */
  .result-banner {
    padding: var(--space-4);
    font-size: var(--font-size-sm);
  }

  .result-banner strong {
    font-size: var(--font-size-lg);
  }

  /* Module/exam cards mobile optimization */
  .module-grid,
  .exam-grid {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }

  .module-card,
  .exam-card {
    padding: var(--space-4);
  }

  .module-card h3,
  .exam-card h3 {
    font-size: var(--font-size-base);
  }

  .module-card p,
  .exam-card p {
    font-size: var(--font-size-xs);
  }

  /* Hide complex animations on mobile for performance */
  .header-particles::after {
    content: none;
  }

  /* Watermark adjustment for mobile */
  body::after {
    font-size: 1.4rem;
    bottom: 3%;
    right: -12%;
  }
}

/* Small mobile devices */
@media (max-width: 380px) {
  .site-header {
    padding-inline: var(--space-3);
  }

  .header-content h1 {
    font-size: var(--font-size-lg);
  }

  .module-index-wrapper,
  .exam-index-wrapper,
  .page-content {
    padding-inline: var(--space-3);
  }

  .exam-button {
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-xs);
  }
}

/* Touch device optimizations */
@media (hover: none) and (pointer: coarse) {
  .question label {
    padding: var(--space-3) var(--space-4);
    min-height: var(--touch-target-min-height);
    display: flex;
    align-items: flex-start;
  }

  .module-card:hover,
  .exam-card:hover {
    transform: none;
  }

  .exam-button:hover {
    transform: none;
  }
}


/* ===== Leaderboard Link Section ===== */
.leaderboard-link-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
  padding: var(--space-5);
  background: linear-gradient(135deg, rgba(59, 158, 206, 0.1), rgba(245, 158, 11, 0.1));
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-xl);
}

.leaderboard-link-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-8);
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-dark));
  color: var(--color-gray-900);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  text-decoration: none;
  border-radius: var(--radius-lg);
  box-shadow: 0 4px 15px rgba(245, 158, 11, 0.4);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.leaderboard-link-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(245, 158, 11, 0.5);
}

.leaderboard-link-btn:active {
  transform: translateY(0);
}

.leaderboard-link-text {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  margin: 0;
}

/* ===== Username Setup Section ===== */
.username-setup-section {
  margin-bottom: var(--space-6);
}

.username-setup-card {
  padding: var(--space-5);
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-gray-700);
  border-radius: var(--radius-lg);
}

.username-setup-section:not(.has-username) .username-setup-card {
  border-color: var(--color-accent);
  box-shadow: 0 0 15px rgba(245, 158, 11, 0.2);
}

.username-setup-card h3 {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.username-setup-card > p {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-4);
}

.username-setup-form {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.username-setup-input {
  flex: 1;
  min-width: 200px;
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-gray-600);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.username-setup-input:focus {
  outline: none;
  border-color: var(--color-primary-light);
  box-shadow: var(--focus-ring);
}

.username-setup-input::placeholder {
  color: var(--color-text-muted);
}

.username-setup-btn {
  padding: var(--space-3) var(--space-5);
  background: var(--color-primary);
  color: var(--color-gray-900);
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.username-setup-btn:hover {
  background: var(--color-primary-light);
  transform: translateY(-1px);
}

.username-setup-btn:active {
  transform: translateY(0);
}

.username-current-display {
  margin-top: var(--space-3);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* Responsive adjustments */
@media (max-width: 640px) {
  .username-setup-form {
    flex-direction: column;
  }
  
  .username-setup-input {
    min-width: 100%;
  }
  
  .leaderboard-link-btn {
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-base);
  }
}



/* Username display classes */
.username-highlight {
  color: var(--color-primary-light);
}

.username-warning {
  color: var(--color-accent);
}

.change-name-link {
  background: none;
  border: none;
  color: var(--color-primary);
  cursor: pointer;
  text-decoration: underline;
  font-size: inherit;
}

.change-name-link:hover {
  color: var(--color-primary-light);
}

.username-setup-input.input-success {
  border-color: var(--color-success);
}



/* ===== Cool Visual Enhancements ===== */

/* Fade-in animation for content on page load */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Apply fade-in to main content sections */
.module-grid {
  animation: fadeInUp 0.6s ease-out 0.2s backwards;
}

.tips-section {
  animation: fadeInUp 0.6s ease-out 0.3s backwards;
}

.username-setup-section {
  animation: fadeInUp 0.6s ease-out 0.1s backwards;
}

.leaderboard-link-section {
  animation: fadeInUp 0.6s ease-out 0.05s backwards;
}

/* Enhanced glow effect for focused inputs */
input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(var(--color-primary-rgb), 0.2),
              0 0 20px rgba(var(--color-primary-rgb), 0.3);
}

/* Smooth transitions for all interactive elements */
a, button, input, select, textarea {
  transition: all 0.2s ease-in-out;
}

/* Improve link hover effects */
a:not(.module-card):not(.exam-card):hover {
  filter: brightness(1.2);
  text-shadow: 0 0 8px rgba(var(--color-primary-rgb), 0.5);
}