/* =============================================
   NETRINIX CERTPREP — DESIGN SYSTEM
   Matching Netrinix.com space/cyber dark theme
   ============================================= */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Orbitron:wght@400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

/* ---- CSS Custom Properties ---- */
:root {
  /* Background Colors */
  --bg-primary: #0a0a1a;
  --bg-secondary: #0d1117;
  --bg-card: rgba(13, 17, 23, 0.8);
  --bg-card-hover: rgba(20, 27, 38, 0.9);
  --bg-glass: rgba(255, 255, 255, 0.03);
  --bg-glass-hover: rgba(255, 255, 255, 0.06);
  --bg-overlay: rgba(0, 0, 0, 0.7);

  /* Accent Colors */
  --accent-cyan: #00d4ff;
  --accent-cyan-glow: rgba(0, 212, 255, 0.3);
  --accent-pink: #ff006e;
  --accent-pink-glow: rgba(255, 0, 110, 0.3);
  --accent-purple: #8b5cf6;
  --accent-purple-glow: rgba(139, 92, 246, 0.3);
  --accent-green: #00ff88;
  --accent-green-glow: rgba(0, 255, 136, 0.3);
  --accent-orange: #ff8c00;
  --accent-yellow: #ffd700;
  --accent-red: #ff4757;

  /* Text Colors */
  --text-primary: #ffffff;
  --text-secondary: #a0aec0;
  --text-muted: #6b7280;
  --text-accent: var(--accent-cyan);

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #00d4ff, #8b5cf6);
  --gradient-danger: linear-gradient(135deg, #ff006e, #ff4757);
  --gradient-success: linear-gradient(135deg, #00ff88, #00d4ff);
  --gradient-hero: linear-gradient(180deg, rgba(0,212,255,0.08) 0%, transparent 50%);
  --gradient-card-border: linear-gradient(135deg, rgba(0,212,255,0.3), rgba(139,92,246,0.1), rgba(255,0,110,0.3));

  /* Borders */
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-accent: rgba(0, 212, 255, 0.3);
  --border-radius-sm: 8px;
  --border-radius-md: 12px;
  --border-radius-lg: 16px;
  --border-radius-xl: 24px;
  --border-radius-full: 9999px;

  /* Shadows */
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-glow-cyan: 0 0 30px rgba(0, 212, 255, 0.2);
  --shadow-glow-pink: 0 0 30px rgba(255, 0, 110, 0.2);
  --shadow-glow-purple: 0 0 30px rgba(139, 92, 246, 0.2);
  --shadow-glow-green: 0 0 30px rgba(0, 255, 136, 0.2);

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 96px;

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-display: 'Orbitron', monospace;
  --font-mono: 'JetBrains Mono', monospace;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
  --transition-bounce: 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-primary);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}

a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: #fff;
}

img {
  max-width: 100%;
  height: auto;
}

button {
  cursor: pointer;
  border: none;
  outline: none;
  font-family: var(--font-primary);
}

/* ---- Stars Background ---- */
.stars-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.stars-bg .star {
  position: absolute;
  background: #fff;
  border-radius: 50%;
  animation: twinkle var(--duration, 3s) infinite ease-in-out;
  opacity: 0;
}

@keyframes twinkle {
  0%, 100% { opacity: 0; transform: scale(0.5); }
  50% { opacity: var(--max-opacity, 0.8); transform: scale(1); }
}

/* ---- Navigation Bar ---- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(10, 10, 26, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  transition: all var(--transition-base);
}

.navbar.scrolled {
  padding: 10px 40px;
  background: rgba(10, 10, 26, 0.95);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.navbar-brand .brand-text {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 2px;
}

.navbar-brand .brand-sub {
  font-size: 0.65rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 3px;
  margin-top: -4px;
}

.navbar-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.navbar-links a {
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: var(--border-radius-full);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition-base);
  position: relative;
}

.navbar-links a:hover,
.navbar-links a.active {
  color: var(--text-primary);
  background: var(--bg-glass-hover);
}

.navbar-links a.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background: var(--accent-cyan);
  border-radius: 2px;
}

.nav-btn {
  background: var(--gradient-primary);
  color: #fff !important;
  padding: 10px 24px !important;
  border-radius: var(--border-radius-full) !important;
  font-weight: 600 !important;
  font-size: 0.85rem !important;
  letter-spacing: 0.5px;
  transition: all var(--transition-base) !important;
  box-shadow: 0 4px 15px var(--accent-cyan-glow);
}

.nav-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px var(--accent-cyan-glow);
}

/* Mobile Nav Toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-base);
}

/* ---- Hero Section ---- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 20px 80px;
  background: var(--gradient-hero);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0,212,255,0.08) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-glass);
  border: 1px solid var(--border-accent);
  border-radius: var(--border-radius-full);
  padding: 8px 20px;
  font-size: 0.85rem;
  color: var(--accent-cyan);
  margin-bottom: var(--space-lg);
  animation: fadeInUp 0.6s ease;
}

.hero-badge .badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-green);
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(0,255,136,0.4); }
  50% { box-shadow: 0 0 0 8px rgba(0,255,136,0); }
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: var(--space-lg);
  animation: fadeInUp 0.6s ease 0.1s both;
}

.hero h1 .gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-xl);
  line-height: 1.7;
  animation: fadeInUp 0.6s ease 0.2s both;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-2xl);
  margin-top: var(--space-2xl);
  animation: fadeInUp 0.6s ease 0.4s both;
}

.hero-stat {
  text-align: center;
}

.hero-stat .stat-number {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-stat .stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---- Section Layout ---- */
.section {
  position: relative;
  z-index: 1;
  padding: var(--space-4xl) 20px;
}

.section-container {
  max-width: 1200px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.section-header h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 800;
  margin-bottom: var(--space-md);
  letter-spacing: 1px;
}

.section-header .section-line {
  width: 80px;
  height: 3px;
  background: var(--gradient-primary);
  border-radius: 3px;
  margin: 0 auto var(--space-md);
}

.section-header p {
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
  font-size: 1.05rem;
}

/* ---- Certification Cards Grid ---- */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: var(--space-lg);
}

.cert-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-lg);
  padding: var(--space-xl);
  transition: all var(--transition-base);
  overflow: hidden;
  cursor: pointer;
}

.cert-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--card-accent, var(--gradient-primary));
  opacity: 0;
  transition: opacity var(--transition-base);
}

.cert-card:hover {
  transform: translateY(-6px);
  border-color: var(--card-border-color, var(--accent-cyan));
  box-shadow: var(--card-shadow, var(--shadow-glow-cyan));
  background: var(--bg-card-hover);
}

.cert-card:hover::before {
  opacity: 1;
}

.cert-card-icon {
  width: 60px;
  height: 60px;
  border-radius: var(--border-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin-bottom: var(--space-lg);
  background: var(--icon-bg, rgba(0,212,255,0.1));
  border: 1px solid var(--icon-border, rgba(0,212,255,0.2));
}

.cert-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.cert-card .cert-abbr {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--card-border-color, var(--accent-cyan));
  margin-bottom: var(--space-md);
  letter-spacing: 1px;
}

.cert-card p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.6;
  margin-bottom: var(--space-lg);
}

.cert-card-meta {
  display: flex;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
  padding-top: var(--space-md);
  border-top: 1px solid var(--border-subtle);
}

.cert-meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.cert-meta-item .meta-icon {
  font-size: 1rem;
}

.cert-meta-item strong {
  color: var(--text-primary);
  font-weight: 600;
}

.cert-card-btn {
  width: 100%;
  padding: 14px 24px;
  border-radius: var(--border-radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  background: var(--card-btn-bg, rgba(0,212,255,0.1));
  color: var(--card-border-color, var(--accent-cyan));
  border: 1px solid var(--card-border-color, rgba(0,212,255,0.3));
  transition: all var(--transition-base);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.cert-card-btn:hover {
  background: var(--card-border-color, var(--accent-cyan));
  color: var(--bg-primary);
  transform: translateY(-1px);
  box-shadow: 0 4px 20px var(--card-glow, var(--accent-cyan-glow));
}

.cert-card-btn .btn-arrow {
  transition: transform var(--transition-base);
}

.cert-card-btn:hover .btn-arrow {
  transform: translateX(4px);
}

/* Card Color Variants */
.cert-card[data-cert="ceh"] {
  --card-accent: linear-gradient(135deg, #ff006e, #ff4757);
  --card-border-color: #ff006e;
  --card-shadow: var(--shadow-glow-pink);
  --card-glow: var(--accent-pink-glow);
  --card-btn-bg: rgba(255,0,110,0.1);
  --icon-bg: rgba(255,0,110,0.1);
  --icon-border: rgba(255,0,110,0.2);
}

.cert-card[data-cert="security-plus"] {
  --card-accent: linear-gradient(135deg, #00d4ff, #0099ff);
  --card-border-color: #00d4ff;
  --card-shadow: var(--shadow-glow-cyan);
  --card-glow: var(--accent-cyan-glow);
  --card-btn-bg: rgba(0,212,255,0.1);
  --icon-bg: rgba(0,212,255,0.1);
  --icon-border: rgba(0,212,255,0.2);
}

.cert-card[data-cert="cissp"] {
  --card-accent: linear-gradient(135deg, #8b5cf6, #a78bfa);
  --card-border-color: #8b5cf6;
  --card-shadow: var(--shadow-glow-purple);
  --card-glow: var(--accent-purple-glow);
  --card-btn-bg: rgba(139,92,246,0.1);
  --icon-bg: rgba(139,92,246,0.1);
  --icon-border: rgba(139,92,246,0.2);
}

.cert-card[data-cert="cysa-plus"] {
  --card-accent: linear-gradient(135deg, #00ff88, #00d4ff);
  --card-border-color: #00ff88;
  --card-shadow: var(--shadow-glow-green);
  --card-glow: var(--accent-green-glow);
  --card-btn-bg: rgba(0,255,136,0.1);
  --icon-bg: rgba(0,255,136,0.1);
  --icon-border: rgba(0,255,136,0.2);
}

.cert-card[data-cert="oscp"] {
  --card-accent: linear-gradient(135deg, #ff8c00, #ffd700);
  --card-border-color: #ff8c00;
  --card-shadow: 0 0 30px rgba(255,140,0,0.2);
  --card-glow: rgba(255,140,0,0.3);
  --card-btn-bg: rgba(255,140,0,0.1);
  --icon-bg: rgba(255,140,0,0.1);
  --icon-border: rgba(255,140,0,0.2);
}

.cert-card[data-cert="network-plus"] {
  --card-accent: linear-gradient(135deg, #06b6d4, #0ea5e9);
  --card-border-color: #06b6d4;
  --card-shadow: 0 0 30px rgba(6,182,212,0.2);
  --card-glow: rgba(6,182,212,0.3);
  --card-btn-bg: rgba(6,182,212,0.1);
  --icon-bg: rgba(6,182,212,0.1);
  --icon-border: rgba(6,182,212,0.2);
}

.cert-card[data-cert="isc2-cc"] {
  --card-accent: linear-gradient(135deg, #f59e0b, #fbbf24);
  --card-border-color: #f59e0b;
  --card-shadow: 0 0 30px rgba(245,158,11,0.2);
  --card-glow: rgba(245,158,11,0.3);
  --card-btn-bg: rgba(245,158,11,0.1);
  --icon-bg: rgba(245,158,11,0.1);
  --icon-border: rgba(245,158,11,0.2);
}

/* ---- How It Works Section ---- */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
  position: relative;
}

.steps-grid::before {
  content: '';
  position: absolute;
  top: 60px;
  left: 15%;
  right: 15%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent-cyan), var(--accent-purple), var(--accent-pink), transparent);
  opacity: 0.3;
}

.step-card {
  text-align: center;
  padding: var(--space-xl);
  position: relative;
}

.step-number {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 800;
  margin: 0 auto var(--space-lg);
  position: relative;
  z-index: 2;
}

.step-card:nth-child(1) .step-number {
  background: rgba(0,212,255,0.15);
  color: var(--accent-cyan);
  border: 2px solid rgba(0,212,255,0.3);
}

.step-card:nth-child(2) .step-number {
  background: rgba(139,92,246,0.15);
  color: var(--accent-purple);
  border: 2px solid rgba(139,92,246,0.3);
}

.step-card:nth-child(3) .step-number {
  background: rgba(0,255,136,0.15);
  color: var(--accent-green);
  border: 2px solid rgba(0,255,136,0.3);
}

.step-card h3 {
  font-size: 1.15rem;
  margin-bottom: var(--space-sm);
}

.step-card p {
  color: var(--text-secondary);
  font-size: 0.92rem;
}

.step-icon {
  font-size: 2rem;
  margin-bottom: var(--space-md);
}

/* ---- Modal ---- */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 10000;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  padding: 20px;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border-accent);
  border-radius: var(--border-radius-xl);
  padding: var(--space-2xl);
  max-width: 480px;
  width: 100%;
  position: relative;
  transform: scale(0.9) translateY(20px);
  transition: transform var(--transition-base);
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.5), var(--shadow-glow-cyan);
}

.modal-overlay.active .modal {
  transform: scale(1) translateY(0);
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: rgba(255,0,110,0.1);
  color: var(--accent-pink);
  border-color: var(--accent-pink);
}

.modal h2 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  margin-bottom: var(--space-sm);
  letter-spacing: 1px;
}

.modal .modal-subtitle {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: var(--space-xl);
}

.modal .form-group {
  margin-bottom: var(--space-lg);
}

.modal label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
  font-weight: 500;
}

.modal input[type="text"] {
  width: 100%;
  padding: 14px 18px;
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-md);
  color: var(--text-primary);
  font-family: var(--font-primary);
  font-size: 1rem;
  transition: all var(--transition-base);
  outline: none;
}

.modal input[type="text"]:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 3px var(--accent-cyan-glow);
}

.modal input[type="text"]::placeholder {
  color: var(--text-muted);
}

.modal .btn-start-exam {
  width: 100%;
  padding: 16px 24px;
  background: var(--gradient-primary);
  color: #fff;
  border: none;
  border-radius: var(--border-radius-md);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  transition: all var(--transition-base);
  box-shadow: 0 4px 20px var(--accent-cyan-glow);
}

.modal .btn-start-exam:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-cyan-glow);
}

.modal .btn-start-exam:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* ---- Exam Page ---- */
.exam-container {
  padding-top: 80px;
  min-height: 100vh;
  position: relative;
  z-index: 1;
}

/* Exam Header Bar */
.exam-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 10, 26, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.exam-header-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.exam-cert-name {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--accent-cyan);
}

.exam-progress-text {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.exam-progress-text strong {
  color: var(--text-primary);
}

.exam-header-center {
  flex: 1;
  max-width: 400px;
}

.progress-bar-container {
  width: 100%;
  height: 6px;
  background: rgba(255,255,255,0.05);
  border-radius: 3px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: 3px;
  transition: width var(--transition-base);
  position: relative;
}

.progress-bar-fill::after {
  content: '';
  position: absolute;
  right: 0;
  top: 0;
  width: 20px;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4));
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  0% { opacity: 0; }
  50% { opacity: 1; }
  100% { opacity: 0; }
}

.exam-header-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.exam-timer {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--accent-green);
  padding: 6px 16px;
  background: rgba(0,255,136,0.08);
  border: 1px solid rgba(0,255,136,0.2);
  border-radius: var(--border-radius-full);
}

.exam-timer.warning {
  color: var(--accent-orange);
  background: rgba(255,140,0,0.08);
  border-color: rgba(255,140,0,0.2);
  animation: timer-pulse 1s infinite;
}

.exam-timer.danger {
  color: var(--accent-red);
  background: rgba(255,71,87,0.08);
  border-color: rgba(255,71,87,0.2);
  animation: timer-pulse 0.5s infinite;
}

@keyframes timer-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

.btn-submit-exam {
  padding: 10px 24px;
  background: var(--gradient-danger);
  color: #fff;
  border: none;
  border-radius: var(--border-radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  transition: all var(--transition-base);
}

.btn-submit-exam:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px var(--accent-pink-glow);
}

/* Exam Body */
.exam-body {
  display: flex;
  gap: var(--space-xl);
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-xl);
}

.exam-main {
  flex: 1;
  min-width: 0;
}

.exam-sidebar {
  width: 280px;
  flex-shrink: 0;
}

/* Question Card */
.question-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-lg);
  padding: var(--space-xl);
  margin-bottom: var(--space-lg);
  animation: fadeInUp 0.3s ease;
}

.question-number {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-cyan);
  margin-bottom: var(--space-md);
  letter-spacing: 1px;
}

.question-text {
  font-size: 1.15rem;
  font-weight: 500;
  line-height: 1.7;
  margin-bottom: var(--space-xl);
  color: var(--text-primary);
}

/* Options */
.options-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.option-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 20px;
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
}

.option-item:hover {
  background: var(--bg-glass-hover);
  border-color: rgba(0,212,255,0.3);
}

.option-item.selected {
  background: rgba(0,212,255,0.08);
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 1px var(--accent-cyan);
}

.option-item.correct {
  background: rgba(0,255,136,0.08);
  border-color: var(--accent-green);
}

.option-item.incorrect {
  background: rgba(255,71,87,0.08);
  border-color: var(--accent-red);
}

.option-letter {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border-subtle);
  flex-shrink: 0;
  transition: all var(--transition-base);
}

.option-item.selected .option-letter {
  background: var(--accent-cyan);
  color: var(--bg-primary);
  border-color: var(--accent-cyan);
}

.option-item.correct .option-letter {
  background: var(--accent-green);
  color: var(--bg-primary);
  border-color: var(--accent-green);
}

.option-item.incorrect .option-letter {
  background: var(--accent-red);
  color: #fff;
  border-color: var(--accent-red);
}

.option-text {
  font-size: 0.95rem;
  line-height: 1.6;
  padding-top: 4px;
}

/* Question Navigation */
.question-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-md);
}

.btn-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-md);
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition-base);
}

.btn-nav:hover:not(:disabled) {
  background: var(--bg-glass-hover);
  color: var(--text-primary);
  border-color: var(--border-accent);
}

.btn-nav:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.btn-flag {
  padding: 12px 20px;
  background: rgba(255,215,0,0.08);
  border: 1px solid rgba(255,215,0,0.2);
  border-radius: var(--border-radius-md);
  color: var(--accent-yellow);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition-base);
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-flag:hover {
  background: rgba(255,215,0,0.15);
}

.btn-flag.flagged {
  background: rgba(255,215,0,0.2);
  border-color: var(--accent-yellow);
}

/* Sidebar Question Grid */
.sidebar-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-lg);
  padding: var(--space-lg);
  position: sticky;
  top: 90px;
}

.sidebar-title {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.question-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 6px;
  margin-bottom: var(--space-lg);
}

.q-grid-item {
  width: 100%;
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--border-radius-sm);
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.q-grid-item:hover {
  border-color: var(--accent-cyan);
  color: var(--text-primary);
}

.q-grid-item.current {
  background: rgba(0,212,255,0.2);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-cyan-glow);
}

.q-grid-item.answered {
  background: rgba(0,255,136,0.15);
  border-color: rgba(0,255,136,0.3);
  color: var(--accent-green);
}

.q-grid-item.flagged {
  background: rgba(255,215,0,0.15);
  border-color: rgba(255,215,0,0.3);
  color: var(--accent-yellow);
}

.sidebar-legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 3px;
}

.legend-dot.current { background: var(--accent-cyan); }
.legend-dot.answered { background: var(--accent-green); }
.legend-dot.flagged { background: var(--accent-yellow); }
.legend-dot.unanswered { background: var(--bg-glass); border: 1px solid var(--border-subtle); }

/* ---- Results Page ---- */
.result-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 20px;
  position: relative;
  z-index: 1;
}

.result-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-xl);
  padding: var(--space-2xl) var(--space-3xl);
  max-width: 700px;
  width: 100%;
  text-align: center;
  animation: fadeInUp 0.6s ease;
}

.result-icon {
  font-size: 4rem;
  margin-bottom: var(--space-lg);
  animation: bounceIn 0.6s ease 0.3s both;
}

@keyframes bounceIn {
  0% { transform: scale(0); opacity: 0; }
  50% { transform: scale(1.2); }
  100% { transform: scale(1); opacity: 1; }
}

.result-title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  margin-bottom: var(--space-sm);
  letter-spacing: 1px;
}

.result-title.pass {
  background: var(--gradient-success);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.result-title.fail {
  background: var(--gradient-danger);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.result-subtitle {
  color: var(--text-secondary);
  margin-bottom: var(--space-2xl);
  font-size: 1.05rem;
}

/* Score Circle */
.score-circle-container {
  margin: var(--space-xl) auto;
  width: 200px;
  height: 200px;
  position: relative;
}

.score-circle-svg {
  width: 200px;
  height: 200px;
  transform: rotate(-90deg);
}

.score-circle-bg {
  fill: none;
  stroke: rgba(255,255,255,0.05);
  stroke-width: 8;
}

.score-circle-fill {
  fill: none;
  stroke-width: 8;
  stroke-linecap: round;
  transition: stroke-dashoffset 1.5s ease;
}

.score-circle-fill.pass { stroke: url(#gradient-success); }
.score-circle-fill.fail { stroke: url(#gradient-danger); }

.score-text {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.score-percentage {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 900;
  line-height: 1;
}

.score-percentage.pass { color: var(--accent-green); }
.score-percentage.fail { color: var(--accent-red); }

.score-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Result Stats */
.result-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin: var(--space-2xl) 0;
}

.result-stat {
  padding: var(--space-lg);
  background: var(--bg-glass);
  border-radius: var(--border-radius-md);
  border: 1px solid var(--border-subtle);
}

.result-stat .stat-value {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 800;
}

.result-stat .stat-value.correct { color: var(--accent-green); }
.result-stat .stat-value.incorrect { color: var(--accent-red); }
.result-stat .stat-value.skipped { color: var(--accent-yellow); }

.result-stat .stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Result Actions */
.result-actions {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
  margin-top: var(--space-xl);
}

.btn-download-cert {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 16px 32px;
  background: var(--gradient-success);
  color: var(--bg-primary);
  border: none;
  border-radius: var(--border-radius-full);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  transition: all var(--transition-base);
  box-shadow: 0 4px 20px var(--accent-green-glow);
}

.btn-download-cert:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px var(--accent-green-glow);
}

.btn-retry,
.btn-home {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 16px 28px;
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  border-radius: var(--border-radius-full);
  font-size: 0.95rem;
  font-weight: 600;
  transition: all var(--transition-base);
}

.btn-retry:hover,
.btn-home:hover {
  background: var(--bg-glass-hover);
  color: var(--text-primary);
  border-color: var(--border-accent);
  transform: translateY(-2px);
}

/* Certificate Preview */
.cert-preview-section {
  margin-top: var(--space-2xl);
  padding-top: var(--space-2xl);
  border-top: 1px solid var(--border-subtle);
}

.cert-preview-title {
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
  letter-spacing: 1px;
}

.cert-canvas-wrapper {
  background: #fff;
  border-radius: var(--border-radius-md);
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
  max-width: 100%;
}

.cert-canvas-wrapper canvas {
  width: 100%;
  height: auto;
  display: block;
}

/* ---- Review Section ---- */
.review-section {
  max-width: 900px;
  margin: var(--space-2xl) auto;
  padding: 0 20px var(--space-3xl);
  position: relative;
  z-index: 1;
}

.review-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.review-header h2 {
  font-family: var(--font-display);
  font-size: 1.6rem;
  margin-bottom: var(--space-sm);
}

.review-filter-bar {
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
}

.review-filter-btn {
  padding: 8px 20px;
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-full);
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 500;
  transition: all var(--transition-base);
}

.review-filter-btn:hover,
.review-filter-btn.active {
  background: rgba(0,212,255,0.1);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.review-question {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-lg);
  padding: var(--space-xl);
  margin-bottom: var(--space-md);
}

.review-question .rq-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.rq-status {
  padding: 4px 12px;
  border-radius: var(--border-radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.rq-status.correct {
  background: rgba(0,255,136,0.1);
  color: var(--accent-green);
}

.rq-status.incorrect {
  background: rgba(255,71,87,0.1);
  color: var(--accent-red);
}

.rq-status.skipped {
  background: rgba(255,215,0,0.1);
  color: var(--accent-yellow);
}

.rq-number {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.review-question .rq-text {
  font-size: 1.05rem;
  line-height: 1.7;
  margin-bottom: var(--space-md);
}

.review-question .explanation {
  padding: var(--space-md);
  background: rgba(0,212,255,0.05);
  border-left: 3px solid var(--accent-cyan);
  border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-top: var(--space-md);
}

/* ---- Footer ---- */
.footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--border-subtle);
  padding: var(--space-2xl) 20px;
  text-align: center;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
}

.footer-brand {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-md);
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--space-xl);
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--accent-cyan);
}

.footer-copy {
  color: var(--text-muted);
  font-size: 0.8rem;
}

.footer-copy a {
  color: var(--accent-cyan);
}

/* ---- Confirmation Modal ---- */
.confirm-modal .modal {
  max-width: 420px;
  text-align: center;
}

.confirm-modal .confirm-icon {
  font-size: 3rem;
  margin-bottom: var(--space-md);
}

.confirm-modal .confirm-actions {
  display: flex;
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

.confirm-modal .btn-confirm {
  flex: 1;
  padding: 14px;
  border-radius: var(--border-radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  transition: all var(--transition-base);
}

.confirm-modal .btn-confirm.danger {
  background: var(--gradient-danger);
  color: #fff;
}

.confirm-modal .btn-confirm.cancel {
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

.confirm-modal .btn-confirm:hover {
  transform: translateY(-2px);
}

/* ---- Confetti Canvas ---- */
#confetti-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 99999;
}

/* ---- Utility Classes ---- */
.hidden { display: none !important; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}

/* ---- Responsive Design ---- */
@media (max-width: 1024px) {
  .exam-body {
    flex-direction: column;
  }

  .exam-sidebar {
    width: 100%;
    order: -1;
  }

  .sidebar-card {
    position: static;
  }

  .question-grid {
    grid-template-columns: repeat(10, 1fr);
  }
}

@media (max-width: 768px) {
  .navbar {
    padding: 12px 20px;
  }

  .navbar-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--bg-secondary);
    border-left: 1px solid var(--border-subtle);
    flex-direction: column;
    padding: 80px 24px 24px;
    transition: right var(--transition-base);
    z-index: 999;
  }

  .navbar-links.open {
    right: 0;
  }

  .nav-toggle {
    display: flex;
    z-index: 1001;
  }

  .cert-grid {
    grid-template-columns: 1fr;
  }

  .steps-grid {
    grid-template-columns: 1fr;
  }

  .steps-grid::before {
    display: none;
  }

  .hero h1 {
    font-size: 1.8rem;
  }

  .hero-stats {
    flex-direction: column;
    gap: var(--space-lg);
  }

  .exam-header {
    flex-wrap: wrap;
    padding: 10px 16px;
    gap: 8px;
  }

  .exam-header-center {
    order: 3;
    max-width: 100%;
    flex-basis: 100%;
  }

  .exam-body {
    padding: var(--space-md);
  }

  .question-card {
    padding: var(--space-lg);
  }

  .question-grid {
    grid-template-columns: repeat(5, 1fr);
  }

  .result-stats {
    grid-template-columns: 1fr;
  }

  .result-card {
    padding: var(--space-xl);
  }

  .result-actions {
    flex-direction: column;
  }

  .review-filter-bar {
    flex-wrap: wrap;
  }

  .question-nav {
    flex-wrap: wrap;
  }

  .footer-links {
    flex-direction: column;
    gap: var(--space-md);
  }

  .btn-submit-exam {
    padding: 8px 16px;
    font-size: 0.8rem;
  }

  .exam-cert-name {
    font-size: 0.75rem;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: 100px 16px 60px;
  }

  .section {
    padding: var(--space-2xl) 16px;
  }

  .cert-card {
    padding: var(--space-lg);
  }

  .modal {
    padding: var(--space-xl);
  }

  .question-grid {
    grid-template-columns: repeat(5, 1fr);
  }

  .exam-timer {
    font-size: 0.9rem;
    padding: 4px 12px;
  }

  .score-circle-container {
    width: 160px;
    height: 160px;
  }

  .score-circle-svg {
    width: 160px;
    height: 160px;
  }

  .score-percentage {
    font-size: 2.4rem;
  }
}

/* ---- Print Styles ---- */
@media print {
  body { background: #fff; color: #000; }
  .navbar, .stars-bg, .footer, .result-actions, .review-section { display: none; }
  .result-card { box-shadow: none; border: 1px solid #ddd; }
}