/* ========================================
   Learn With Abinash - Modern Website
   CSS Framework & Design System
   ======================================== */

/* ---------- CSS Custom Properties ---------- */
:root {
  /* Primary Colors */
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #3b82f6;
  --primary-50: #eff6ff;
  --primary-100: #dbeafe;
  --primary-200: #bfdbfe;

  /* Accent Colors */
  --accent: #f59e0b;
  --accent-dark: #d97706;
  --accent-light: #fbbf24;

  /* Neutral Colors */
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;

  /* Semantic Colors */
  --success: #10b981;
  --success-light: #d1fae5;
  --error: #ef4444;
  --error-light: #fee2e2;
  --warning: #f59e0b;
  --info: #3b82f6;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
  --gradient-hero: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
  --gradient-card: linear-gradient(145deg, #ffffff 0%, #f8fafc 100%);
  --gradient-accent: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-display: 'Plus Jakarta Sans', var(--font-sans);
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Font Sizes (fluid) */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.8rem);
  --text-sm: clamp(0.8rem, 0.75rem + 0.25vw, 0.875rem);
  --text-base: clamp(0.9rem, 0.85rem + 0.25vw, 1rem);
  --text-lg: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-xl: clamp(1.15rem, 1rem + 0.5vw, 1.25rem);
  --text-2xl: clamp(1.4rem, 1.2rem + 1vw, 1.5rem);
  --text-3xl: clamp(1.7rem, 1.4rem + 1.5vw, 1.875rem);
  --text-4xl: clamp(2rem, 1.5rem + 2.5vw, 2.25rem);
  --text-5xl: clamp(2.5rem, 1.8rem + 3.5vw, 3rem);
  --text-6xl: clamp(3rem, 2rem + 5vw, 3.75rem);

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
  --shadow-glow: 0 0 30px rgb(37 99 235 / 0.3);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
  --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Layout */
  --container-max: 1280px;
  --header-height: 72px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--gray-800);
  background: #ffffff;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
}

input, button, textarea, select {
  font: inherit;
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  line-height: 1.2;
  font-weight: 700;
  color: var(--gray-900);
}

/* ---------- Utility Classes ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.section {
  padding: var(--space-20) 0;
}

.section-lg {
  padding: var(--space-24) 0;
}

.text-center { text-align: center; }
.text-left { text-align: left; }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

.grid { display: grid; }

.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;
}

/* ---------- Section Headers ---------- */
.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--space-16);
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--primary-50);
  color: var(--primary);
  font-size: var(--text-sm);
  font-weight: 600;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
  border: 1px solid var(--primary-200);
}

.section-title {
  font-size: var(--text-4xl);
  margin-bottom: var(--space-4);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  font-size: var(--text-lg);
  color: var(--gray-500);
  line-height: 1.7;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-base);
  font-weight: 600;
  border-radius: var(--radius-lg);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 0%, rgba(255,255,255,0.1) 50%, transparent 100%);
  transform: translateX(-100%);
  transition: transform var(--transition-slow);
}

.btn:hover::before {
  transform: translateX(100%);
}

.btn-primary {
  background: var(--gradient-primary);
  color: #ffffff;
  box-shadow: var(--shadow-md), 0 0 0 0 rgb(37 99 235 / 0.5);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), 0 0 20px rgb(37 99 235 / 0.4);
}

.btn-secondary {
  background: transparent;
  color: var(--primary);
  border-color: var(--primary);
}

.btn-secondary:hover {
  background: var(--primary);
  color: #ffffff;
  transform: translateY(-2px);
}

.btn-accent {
  background: var(--gradient-accent);
  color: #ffffff;
  box-shadow: var(--shadow-md);
}

.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-white {
  background: #ffffff;
  color: var(--gray-800);
  border-color: var(--gray-200);
}

.btn-white:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-lg);
  border-radius: var(--radius-xl);
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
}

/* ---------- Header / Navigation ---------- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(229, 231, 235, 0.5);
  transition: all var(--transition-base);
}

.header.scrolled {
  box-shadow: var(--shadow-md);
  background: rgba(255, 255, 255, 0.8);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-xl);
  color: var(--gray-900);
}

.logo-img {
  width: 52px;
  height: 52px;
  max-width: 52px;
  max-height: 52px;
  border-radius: var(--radius-md);
  object-fit: contain;
  flex-shrink: 0;
  display: inline-block;
}

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

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-link {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--gray-600);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary);
  background: var(--primary-50);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 20px;
  height: 2px;
  background: var(--primary);
  border-radius: var(--radius-full);
  transition: transform var(--transition-base);
}

.nav-link:hover::after,
.nav-link.active::after {
  transform: translateX(-50%) scaleX(1);
}

.nav-cta {
  margin-left: var(--space-4);
}

.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  z-index: 1001;
}

.mobile-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--gray-700);
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
}

.mobile-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.mobile-toggle.active span:nth-child(2) {
  opacity: 0;
}
.mobile-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ---------- Hero Section ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--gradient-hero);
  padding-top: var(--header-height);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(circle at 20% 50%, rgba(37, 99, 235, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(124, 58, 237, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 50% 80%, rgba(245, 158, 11, 0.08) 0%, transparent 50%);
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
}

.hero-particles {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: auto;
}

/* ── Tech Bubbles ── */
.tech-bubble {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px 6px 10px;
  border-radius: 50px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.08);
  backdrop-filter: blur(4px);
  white-space: nowrap;
  cursor: default;
  transition: opacity 0.4s ease, box-shadow 0.4s ease;
  pointer-events: none;
  will-change: left, top, opacity;
}

.tech-bubble:hover {
  opacity: 0.9 !important;
  box-shadow: 0 0 20px var(--bubble-color, rgba(37,99,235,0.3));
}

.tech-bubble-icon {
  font-size: 1.1rem;
  line-height: 1;
}

.tech-bubble-label {
  font-size: 0.7rem;
  font-weight: 600;
  color: rgba(255,255,255,0.7);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

/* ── Sparkle particles (small dots) ── */
.tech-sparkle {
  pointer-events: none;
  will-change: transform, opacity;
}

@keyframes sparkleFloat {
  0%, 100% { transform: translate(0, 0) scale(1); opacity: 0.15; }
  25% { transform: translate(30px, -40px) scale(1.5); opacity: 0.35; }
  50% { transform: translate(-20px, -60px) scale(0.8); opacity: 0.2; }
  75% { transform: translate(15px, -30px) scale(1.3); opacity: 0.3; }
}

.hero .container {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
  padding-top: var(--space-12);
  padding-bottom: var(--space-12);
}

.hero-content {
  color: #ffffff;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: rgba(37, 99, 235, 0.2);
  border: 1px solid rgba(37, 99, 235, 0.4);
  color: var(--primary-200);
  font-size: var(--text-sm);
  font-weight: 600;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-6);
  backdrop-filter: blur(10px);
}

.hero-badge .pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.5); }
}

.hero-title {
  font-size: var(--text-6xl);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: var(--space-6);
  color: #ffffff;
}

.hero-title .highlight {
  background: linear-gradient(135deg, var(--accent) 0%, #fb923c 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: var(--text-lg);
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.8;
  margin-bottom: var(--space-8);
  max-width: 520px;
}

.hero-actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-bottom: var(--space-10);
}

.hero-stats {
  display: flex;
  gap: var(--space-10);
}

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

.hero-stat-number {
  display: block;
  font-size: var(--text-3xl);
  font-weight: 800;
  color: #ffffff;
  font-family: var(--font-display);
}

.hero-stat-label {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.5);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.hero-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-image-wrapper {
  position: relative;
  width: 100%;
  max-width: 500px;
}

.hero-image-wrapper::before {
  content: '';
  position: absolute;
  inset: -20px;
  background: var(--gradient-primary);
  border-radius: var(--radius-2xl);
  opacity: 0.2;
  filter: blur(40px);
}

.hero-image {
  position: relative;
  border-radius: var(--radius-2xl);
  overflow: hidden;
  border: 2px solid rgba(255, 255, 255, 0.1);
  box-shadow: var(--shadow-2xl);
}

.hero-image img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* Floating cards around hero */
.hero-float-card {
  position: absolute;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-xl);
  padding: var(--space-4);
  color: white;
  animation: floatCard 4s ease-in-out infinite;
  z-index: 3;
}

.hero-float-card:nth-child(1) { top: 10%; right: -10%; animation-delay: 0s; }
.hero-float-card:nth-child(2) { bottom: 15%; left: -10%; animation-delay: 1.5s; }

@keyframes floatCard {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.float-card-icon {
  font-size: 1.5rem;
  margin-bottom: var(--space-2);
}

.float-card-title {
  font-size: var(--text-sm);
  font-weight: 600;
}

.float-card-text {
  font-size: var(--text-xs);
  opacity: 0.7;
}

/* ---------- Tech Stack Bar ---------- */
.tech-bar {
  background: var(--gray-50);
  border-top: 1px solid var(--gray-200);
  border-bottom: 1px solid var(--gray-200);
  padding: var(--space-8) 0;
}

.tech-bar-label {
  font-size: var(--text-sm);
  color: var(--gray-400);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 600;
  margin-bottom: var(--space-6);
  text-align: center;
}

.tech-logos {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-10);
  flex-wrap: wrap;
}

.tech-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--gray-500);
  font-weight: 600;
  font-size: var(--text-sm);
  transition: all var(--transition-base);
  opacity: 0.6;
}

.tech-logo:hover {
  opacity: 1;
  color: var(--primary);
}

.tech-logo-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

/* ---------- Features Section ---------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

.feature-card {
  background: var(--gradient-card);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-200);
}

.feature-card:hover::before {
  transform: scaleX(1);
}

.feature-icon {
  width: 56px;
  height: 56px;
  background: var(--primary-50);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: var(--space-5);
  transition: all var(--transition-base);
}

.feature-card:hover .feature-icon {
  background: var(--gradient-primary);
  transform: scale(1.1);
}

.feature-card:hover .feature-icon svg {
  filter: brightness(0) invert(1);
}

.feature-title {
  font-size: var(--text-xl);
  margin-bottom: var(--space-3);
}

.feature-text {
  color: var(--gray-500);
  line-height: 1.7;
}

/* ---------- Courses Section ---------- */
.courses-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

.course-card {
  background: #ffffff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-2xl);
  overflow: hidden;
  transition: all var(--transition-base);
  position: relative;
}

.course-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-2xl);
}

.course-card-image {
  position: relative;
  height: 200px;
  overflow: hidden;
}

.course-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.course-card:hover .course-card-image img {
  transform: scale(1.05);
}

.course-card-badge {
  position: absolute;
  top: var(--space-4);
  left: var(--space-4);
  background: var(--gradient-primary);
  color: white;
  font-size: var(--text-xs);
  font-weight: 700;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.course-card-body {
  padding: var(--space-6);
}

.course-card-title {
  font-size: var(--text-xl);
  margin-bottom: var(--space-3);
}

.course-card-desc {
  color: var(--gray-500);
  font-size: var(--text-sm);
  line-height: 1.7;
  margin-bottom: var(--space-5);
}

.course-card-meta {
  display: flex;
  gap: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--gray-100);
  margin-bottom: var(--space-5);
}

.course-meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  color: var(--gray-500);
}

.course-meta-icon {
  color: var(--primary);
}

.course-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ---------- About Section ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

.about-image-wrapper {
  position: relative;
}

.about-image {
  border-radius: var(--radius-2xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

.about-image img {
  width: 100%;
  height: auto;
}

.about-experience-badge {
  position: absolute;
  bottom: -20px;
  right: -20px;
  background: var(--gradient-primary);
  color: white;
  padding: var(--space-6);
  border-radius: var(--radius-xl);
  text-align: center;
  box-shadow: var(--shadow-xl);
}

.about-experience-number {
  font-size: var(--text-4xl);
  font-weight: 800;
  display: block;
}

.about-experience-label {
  font-size: var(--text-sm);
  opacity: 0.8;
}

.about-content .section-badge { margin-bottom: var(--space-4); }

.about-title {
  font-size: var(--text-4xl);
  margin-bottom: var(--space-6);
}

.about-text {
  color: var(--gray-600);
  line-height: 1.8;
  margin-bottom: var(--space-6);
}

.about-highlights {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

.about-highlight {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 500;
  color: var(--gray-700);
}

.about-highlight-icon {
  width: 24px;
  height: 24px;
  background: var(--success-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--success);
  font-size: 0.75rem;
  flex-shrink: 0;
}

/* ---------- Testimonials ---------- */
.testimonials {
  background: var(--gray-50);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

.testimonial-card {
  background: #ffffff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  transition: all var(--transition-base);
}

.testimonial-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.testimonial-stars {
  display: flex;
  gap: var(--space-1);
  margin-bottom: var(--space-4);
  color: var(--accent);
}

.testimonial-text {
  color: var(--gray-600);
  line-height: 1.8;
  margin-bottom: var(--space-6);
  font-style: italic;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.testimonial-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: var(--text-lg);
}

.testimonial-name {
  font-weight: 600;
  color: var(--gray-800);
}

.testimonial-role {
  font-size: var(--text-sm);
  color: var(--gray-400);
}

/* ---------- CTA Section ---------- */
.cta-section {
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 50%, rgba(37, 99, 235, 0.2) 0%, transparent 50%),
    radial-gradient(circle at 80% 50%, rgba(124, 58, 237, 0.15) 0%, transparent 50%);
}

.cta-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
  color: white;
}

.cta-title {
  font-size: var(--text-4xl);
  margin-bottom: var(--space-4);
  color: white;
}

.cta-text {
  font-size: var(--text-lg);
  opacity: 0.7;
  margin-bottom: var(--space-8);
  line-height: 1.7;
}

.cta-actions {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- Contact Section ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
}

.contact-info-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  margin-top: var(--space-8);
}

.contact-info-item {
  display: flex;
  gap: var(--space-4);
}

.contact-info-icon {
  width: 48px;
  height: 48px;
  background: var(--primary-50);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-size: 1.25rem;
  flex-shrink: 0;
}

.contact-info-label {
  font-size: var(--text-sm);
  color: var(--gray-400);
  margin-bottom: var(--space-1);
}

.contact-info-value {
  font-weight: 600;
  color: var(--gray-800);
}

.contact-info-value a {
  color: var(--primary);
  transition: color var(--transition-fast);
}

.contact-info-value a:hover {
  color: var(--primary-dark);
}

.contact-social {
  display: flex;
  gap: var(--space-3);
  margin-top: var(--space-8);
}

.social-link {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-lg);
  background: var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-600);
  font-size: 1.25rem;
  transition: all var(--transition-base);
}

.social-link:hover {
  background: var(--gradient-primary);
  color: white;
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

/* Contact Form */
.contact-form {
  background: #ffffff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-lg);
}

.form-group {
  margin-bottom: var(--space-5);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: var(--space-2);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-lg);
  font-size: var(--text-base);
  color: var(--gray-800);
  transition: all var(--transition-fast);
  background: #ffffff;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-100);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--gray-400);
}

/* ---------- Footer ---------- */
.footer {
  background: var(--gray-900);
  color: rgba(255, 255, 255, 0.7);
  padding: var(--space-16) 0 var(--space-8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-12);
  margin-bottom: var(--space-12);
}

.footer-brand .logo {
  margin-bottom: var(--space-4);
}

.footer-brand .logo span {
  -webkit-text-fill-color: #ffffff;
}

.footer-brand-text {
  color: rgba(255, 255, 255, 0.5);
  line-height: 1.7;
  margin-bottom: var(--space-6);
  font-size: var(--text-sm);
}

.footer-title {
  color: #ffffff;
  font-size: var(--text-base);
  font-weight: 700;
  margin-bottom: var(--space-5);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-link {
  color: rgba(255, 255, 255, 0.5);
  font-size: var(--text-sm);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.footer-link:hover {
  color: #ffffff;
  transform: translateX(4px);
}

.footer-bottom {
  padding-top: var(--space-8);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer-copyright {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.4);
}

.footer-bottom-links {
  display: flex;
  gap: var(--space-6);
}

.footer-bottom-link {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.4);
  transition: color var(--transition-fast);
}

.footer-bottom-link:hover {
  color: #ffffff;
}

/* ---------- Practice Exams Page ---------- */
.exams-hero {
  background: var(--gradient-hero);
  padding: calc(var(--header-height) + var(--space-16)) 0 var(--space-16);
  color: white;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.exams-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 50%, rgba(37, 99, 235, 0.15) 0%, transparent 60%);
}

.exams-hero .container {
  position: relative;
  z-index: 2;
}

.exams-hero-title {
  font-size: var(--text-5xl);
  color: white;
  margin-bottom: var(--space-4);
}

.exams-hero-subtitle {
  color: rgba(255, 255, 255, 0.6);
  font-size: var(--text-lg);
  max-width: 600px;
  margin: 0 auto;
}

/* Exam category cards */
.exam-categories {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: var(--space-8);
}

.exam-category-card {
  background: #ffffff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-2xl);
  overflow: hidden;
  transition: all var(--transition-base);
}

.exam-category-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.exam-category-header {
  padding: var(--space-6);
  background: var(--gradient-primary);
  color: white;
  position: relative;
  overflow: hidden;
}

.exam-category-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 80% 20%, rgba(255,255,255,0.1) 0%, transparent 50%);
}

.exam-category-icon {
  font-size: 2rem;
  margin-bottom: var(--space-3);
}

.exam-category-name {
  font-size: var(--text-2xl);
  font-weight: 700;
  margin-bottom: var(--space-2);
}

.exam-category-desc {
  font-size: var(--text-sm);
  opacity: 0.8;
}

.exam-category-body {
  padding: var(--space-6);
}

.exam-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.exam-list-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.exam-list-item:hover {
  border-color: var(--primary-200);
  background: var(--primary-50);
}

.exam-list-info {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.exam-list-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--primary-50);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
}

.exam-list-title {
  font-weight: 600;
  font-size: var(--text-sm);
}

.exam-list-meta {
  font-size: var(--text-xs);
  color: var(--gray-400);
}

/* ---------- Exam Taking Interface ---------- */
.exam-container {
  max-width: 900px;
  margin: 0 auto;
  padding: calc(var(--header-height) + var(--space-8)) var(--space-6) var(--space-8);
}

.exam-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #ffffff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-xl);
  padding: var(--space-4) var(--space-6);
  margin-bottom: var(--space-6);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: calc(var(--header-height) + var(--space-4));
  z-index: 100;
}

.exam-timer {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 700;
  font-size: var(--text-lg);
  color: var(--gray-800);
  font-family: var(--font-mono);
}

.exam-timer.warning {
  color: var(--error);
  animation: pulse 1s ease-in-out infinite;
}

.exam-progress-info {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  font-size: var(--text-sm);
  color: var(--gray-500);
}

.exam-progress-bar {
  width: 200px;
  height: 6px;
  background: var(--gray-200);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.exam-progress-fill {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  transition: width var(--transition-base);
}

/* Question Card */
.question-card {
  background: #ffffff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  margin-bottom: var(--space-6);
  box-shadow: var(--shadow-sm);
}

.question-number {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--primary-50);
  color: var(--primary);
  font-size: var(--text-sm);
  font-weight: 700;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
}

.question-text {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--gray-800);
  line-height: 1.6;
  margin-bottom: var(--space-6);
}

.answer-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.answer-option {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  padding: var(--space-4);
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.answer-option:hover {
  border-color: var(--primary-200);
  background: var(--primary-50);
}

.answer-option.selected {
  border-color: var(--primary);
  background: var(--primary-50);
}

.answer-option.correct {
  border-color: var(--success);
  background: var(--success-light);
}

.answer-option.incorrect {
  border-color: var(--error);
  background: var(--error-light);
}

.answer-radio {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2px solid var(--gray-300);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
  transition: all var(--transition-fast);
}

.answer-option.selected .answer-radio {
  border-color: var(--primary);
  background: var(--primary);
}

.answer-option.selected .answer-radio::after {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: white;
}

.answer-label {
  font-weight: 500;
  line-height: 1.5;
}

.answer-letter {
  font-weight: 700;
  color: var(--primary);
  margin-right: var(--space-2);
}

/* Question Navigation */
.question-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--space-6);
}

.question-dots {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
  justify-content: center;
  max-width: 60%;
}

.question-dot {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  border: 1px solid var(--gray-300);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xs);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  background: #ffffff;
  color: var(--gray-500);
}

.question-dot:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.question-dot.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.question-dot.answered {
  background: var(--primary-100);
  color: var(--primary);
  border-color: var(--primary-200);
}

/* Exam Results */
.exam-results {
  text-align: center;
  padding: var(--space-12);
}

.results-score-circle {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: conic-gradient(
    var(--primary) calc(var(--score) * 3.6deg),
    var(--gray-200) 0deg
  );
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-8);
  position: relative;
}

.results-score-inner {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  background: white;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.results-score-number {
  font-size: var(--text-4xl);
  font-weight: 800;
  color: var(--gray-900);
}

.results-score-label {
  font-size: var(--text-sm);
  color: var(--gray-400);
}

.results-title {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-3);
}

.results-subtitle {
  color: var(--gray-500);
  font-size: var(--text-lg);
  margin-bottom: var(--space-8);
}

.results-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
  flex-wrap: wrap;
}

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

.results-stat-value {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--gray-800);
}

.results-stat-label {
  font-size: var(--text-sm);
  color: var(--gray-400);
}

.results-stat.correct .results-stat-value { color: var(--success); }
.results-stat.incorrect .results-stat-value { color: var(--error); }
.results-stat.skipped .results-stat-value { color: var(--warning); }

.results-actions {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
}

/* Explanation Box */
.explanation-box {
  background: var(--primary-50);
  border: 1px solid var(--primary-200);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  margin-top: var(--space-4);
  display: none;
}

.explanation-box.show {
  display: block;
}

.explanation-title {
  font-weight: 700;
  color: var(--primary);
  margin-bottom: var(--space-2);
  font-size: var(--text-sm);
}

.explanation-text {
  color: var(--gray-700);
  font-size: var(--text-sm);
  line-height: 1.7;
}

/* ---------- Exam Start Screen ---------- */
.exam-start {
  text-align: center;
  padding: var(--space-12) var(--space-6);
}

.exam-start-icon {
  font-size: 4rem;
  margin-bottom: var(--space-6);
}

.exam-start-title {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-4);
}

.exam-start-desc {
  color: var(--gray-500);
  font-size: var(--text-lg);
  max-width: 500px;
  margin: 0 auto var(--space-8);
  line-height: 1.7;
}

.exam-start-details {
  display: flex;
  justify-content: center;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
  flex-wrap: wrap;
}

.exam-detail {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 500;
  color: var(--gray-600);
}

.exam-detail-icon {
  color: var(--primary);
}

/* ---------- Page Header (inner pages) ---------- */
.page-header {
  background: var(--gradient-hero);
  padding: calc(var(--header-height) + var(--space-12)) 0 var(--space-12);
  color: white;
  position: relative;
  overflow: hidden;
}

.page-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 50%, rgba(37, 99, 235, 0.15) 0%, transparent 60%);
}

.page-header .container {
  position: relative;
  z-index: 2;
}

.page-header-title {
  font-size: var(--text-5xl);
  color: white;
  margin-bottom: var(--space-4);
}

.page-header-subtitle {
  font-size: var(--text-lg);
  color: rgba(255, 255, 255, 0.6);
  max-width: 600px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: var(--space-4);
}

.breadcrumb a {
  color: rgba(255, 255, 255, 0.5);
  transition: color var(--transition-fast);
}

.breadcrumb a:hover {
  color: white;
}

/* ---------- Animations ---------- */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.slide-in-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.slide-in-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

.scale-in {
  opacity: 0;
  transform: scale(0.9);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.scale-in.visible {
  opacity: 1;
  transform: scale(1);
}

/* ---------- Responsive Design ---------- */
@media (max-width: 1024px) {
  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero-content {
    order: 1;
  }
  
  .hero-visual {
    order: 2;
    display: none;
  }
  
  .hero-description {
    margin-left: auto;
    margin-right: auto;
  }
  
  .hero-actions {
    justify-content: center;
  }
  
  .hero-stats {
    justify-content: center;
  }
  
  .features-grid,
  .courses-grid,
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .about-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
  
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 320px;
    height: 100vh;
    background: white;
    flex-direction: column;
    padding: calc(var(--header-height) + var(--space-8)) var(--space-6) var(--space-8);
    gap: var(--space-1);
    box-shadow: var(--shadow-2xl);
    transition: right var(--transition-slow);
    z-index: 1000;
    align-items: stretch;
  }
  
  .nav.open {
    right: 0;
  }
  
  .nav-link {
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-base);
  }
  
  .nav-cta {
    margin-left: 0;
    margin-top: var(--space-4);
  }
  
  .mobile-toggle {
    display: flex;
  }
  
  .mobile-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
  }
  
  .mobile-overlay.active {
    display: block;
  }
  
  .features-grid,
  .courses-grid,
  .testimonials-grid {
    grid-template-columns: 1fr;
  }
  
  .about-highlights {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
  }
  
  .form-row {
    grid-template-columns: 1fr;
  }
  
  .hero-stats {
    flex-wrap: wrap;
    gap: var(--space-6);
  }
  
  .exam-header-bar {
    flex-direction: column;
    gap: var(--space-3);
    text-align: center;
  }
  
  .question-dots {
    max-width: 100%;
  }
  
  .question-nav {
    flex-direction: column;
    gap: var(--space-4);
  }
  
  .exam-categories {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-4);
  }
  
  .hero-actions {
    flex-direction: column;
    align-items: center;
  }
  
  .btn-lg {
    width: 100%;
  }
  
  .cta-actions {
    flex-direction: column;
    align-items: center;
  }
}

/* ---------- Print Styles ---------- */
@media print {
  .header, .footer, .mobile-toggle, .btn, .whatsapp-float {
    display: none !important;
  }
  
  .hero { min-height: auto; background: none; color: black; }
  
  body {
    font-size: 12pt;
    color: #000;
  }
}

/* ─────────────────────────────────── */
/* Floating WhatsApp Button           */
/* ─────────────────────────────────── */
.whatsapp-float {
  position: fixed;
  bottom: 5.5rem;
  right: 2rem;
  z-index: 9999;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: #25D366;
  color: white;
  padding: 0.875rem 1.5rem;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9375rem;
  box-shadow: 0 4px 20px rgba(37, 211, 102, 0.4), 0 2px 8px rgba(0,0,0,0.15);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  animation: whatsappPulse 2s ease-in-out infinite;
}

.whatsapp-float:hover {
  background: #20bd5a;
  transform: scale(1.05);
  box-shadow: 0 6px 28px rgba(37, 211, 102, 0.5), 0 4px 12px rgba(0,0,0,0.2);
}

.whatsapp-float svg {
  flex-shrink: 0;
}

.whatsapp-float-text {
  white-space: nowrap;
}

@keyframes whatsappPulse {
  0%, 100% {
    box-shadow: 0 4px 20px rgba(37, 211, 102, 0.4), 0 2px 8px rgba(0,0,0,0.15);
  }
  50% {
    box-shadow: 0 4px 30px rgba(37, 211, 102, 0.6), 0 2px 12px rgba(0,0,0,0.2);
  }
}

@media (max-width: 768px) {
  .whatsapp-float {
    bottom: 4.5rem;
    right: 1.25rem;
    padding: 0.75rem;
    border-radius: 50%;
  }
  
  .whatsapp-float-text {
    display: none;
  }
}