/* ==========================================================================
   Tutorio - AI-ondersteunde Bijles
   Design System & Styles
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties
   -------------------------------------------------------------------------- */
:root {
  /* Typography */
  --font-display: 'Bricolage Grotesque', system-ui, sans-serif;
  --font-body: 'DM Sans', system-ui, sans-serif;

  /* Colors */
  --color-primary: #0d7377;
  --color-primary-dark: #095c5f;
  --color-primary-light: #0f8a8f;
  --color-accent: #ff6b6b;
  --color-accent-light: #ff8585;
  --color-dark: #1a1a2e;
  --color-dark-soft: #2d2d44;
  --color-light: #f8f9fa;
  --color-light-alt: #eef1f5;
  --color-muted: #6b7280;
  --color-white: #ffffff;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 5rem;
  --space-3xl: 8rem;

  /* Layout */
  --max-width: 1200px;
  --border-radius: 1rem;
  --border-radius-sm: 0.5rem;
  --border-radius-lg: 1.5rem;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(26, 26, 46, 0.06);
  --shadow-md: 0 8px 30px rgba(26, 26, 46, 0.1);
  --shadow-lg: 0 20px 50px rgba(26, 26, 46, 0.15);
  --shadow-glow: 0 0 40px rgba(13, 115, 119, 0.2);

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-dark);
  background-color: var(--color-light);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover {
  color: var(--color-primary-dark);
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-dark);
}

h1 {
  font-size: clamp(2.5rem, 6vw, 4rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(2rem, 4vw, 2.75rem);
  letter-spacing: -0.01em;
}

h3 {
  font-size: clamp(1.25rem, 2vw, 1.5rem);
}

p {
  color: var(--color-dark-soft);
}

.lead {
  font-size: 1.25rem;
  color: var(--color-muted);
}

/* --------------------------------------------------------------------------
   Layout Components
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

section {
  padding: var(--space-3xl) 0;
}

/* --------------------------------------------------------------------------
   Navigation
   -------------------------------------------------------------------------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--space-sm) 0;
  background: rgba(248, 249, 250, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(26, 26, 46, 0.05);
  transition: all var(--transition-base);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

.nav-logo img {
  height: 60px;
  width: auto;
}

.nav-links {
  display: flex;
  gap: var(--space-lg);
  list-style: none;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-dark-soft);
  transition: color var(--transition-fast);
}

.nav-links a:hover {
  color: var(--color-primary);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 0.6rem 1.25rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-white);
  background: var(--color-primary);
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-fast);
}

.nav-cta:hover {
  color: var(--color-white);
  background: var(--color-primary-dark);
  transform: translateY(-2px);
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 0.5rem;
  background: none;
  border: none;
  cursor: pointer;
}

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

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    padding: var(--space-sm);
    background: var(--color-white);
    border-bottom: 1px solid rgba(26, 26, 46, 0.1);
    box-shadow: var(--shadow-md);
  }

  .nav-links.active {
    display: flex;
  }

  .nav-links li {
    padding: var(--space-sm);
    border-bottom: 1px solid rgba(26, 26, 46, 0.05);
  }

  .nav-links li:last-child {
    border-bottom: none;
  }
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px;
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-light) 0%, var(--color-light-alt) 100%);
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 80%;
  height: 150%;
  background: radial-gradient(ellipse at center, rgba(13, 115, 119, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 50%;
  height: 80%;
  background: radial-gradient(ellipse at center, rgba(255, 107, 107, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

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

.hero-content {
  max-width: 560px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 0.5rem 1rem;
  margin-bottom: var(--space-md);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
  background: rgba(13, 115, 119, 0.1);
  border-radius: 2rem;
}

.hero-badge::before {
  content: '✨';
}

.hero h1 {
  margin-bottom: var(--space-md);
}

.hero h1 .highlight {
  position: relative;
  color: var(--color-primary);
}

.hero h1 .highlight::after {
  content: '';
  position: absolute;
  bottom: 0.1em;
  left: 0;
  right: 0;
  height: 0.3em;
  background: rgba(255, 107, 107, 0.3);
  z-index: -1;
  border-radius: 4px;
}

.hero-description {
  font-size: 1.2rem;
  margin-bottom: var(--space-lg);
  color: var(--color-muted);
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.hero-image {
  position: relative;
  display: flex;
  justify-content: center;
}

.hero-image-wrapper {
  position: relative;
  width: 500px;
  height: 500px;
}

.hero-image-wrapper {
  text-align: center;
}

.hero-image-wrapper img {
  position: relative;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.hero-brand {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-top: -5rem;
}

.brand-tutor {
  color: var(--color-accent);
}

.brand-io {
  color: var(--color-primary);
}

/* Floating elements */
.hero-float {
  position: absolute;
  padding: 0.75rem 1rem;
  background: var(--color-white);
  border-radius: var(--border-radius-sm);
  box-shadow: var(--shadow-md);
  font-size: 0.875rem;
  font-weight: 500;
  animation: float 4s ease-in-out infinite;
}

.hero-float-1 {
  top: 10%;
  right: 0;
  animation-delay: 0s;
}

.hero-float-2 {
  bottom: 20%;
  left: -10%;
  animation-delay: 1s;
}

.hero-float-3 {
  bottom: 5%;
  right: 10%;
  animation-delay: 2s;
}

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

@media (max-width: 968px) {
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-content {
    max-width: 100%;
  }

  .hero-cta {
    justify-content: center;
  }

  .hero-image-wrapper {
    width: 300px;
    height: 300px;
  }

  .hero-float {
    display: none;
  }
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: 1rem 2rem;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  text-align: center;
  border: none;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-primary {
  color: var(--color-white);
  background: var(--color-primary);
  box-shadow: 0 4px 14px rgba(13, 115, 119, 0.3);
}

.btn-primary:hover {
  color: var(--color-white);
  background: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(13, 115, 119, 0.4);
}

.btn-secondary {
  color: var(--color-dark);
  background: var(--color-white);
  border: 2px solid rgba(26, 26, 46, 0.1);
}

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

/* --------------------------------------------------------------------------
   About Section
   -------------------------------------------------------------------------- */
.about {
  background: var(--color-white);
}

.about-container {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space-2xl);
  align-items: center;
}

.about-image {
  position: relative;
}

.about-image img {
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
}

.about-image::after {
  content: '';
  position: absolute;
  top: 20px;
  left: 20px;
  right: -20px;
  bottom: -20px;
  border: 3px solid var(--color-primary);
  border-radius: var(--border-radius-lg);
  z-index: -1;
  opacity: 0.3;
}

.about-content h2 {
  margin-bottom: var(--space-md);
}

.about-content p {
  margin-bottom: var(--space-md);
}

.about-stats {
  display: flex;
  gap: var(--space-xl);
  margin-top: var(--space-lg);
  padding-top: var(--space-lg);
  border-top: 1px solid rgba(26, 26, 46, 0.1);
}

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

.about-stat-number {
  display: block;
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
}

.about-stat-label {
  font-size: 0.875rem;
  color: var(--color-muted);
}

@media (max-width: 868px) {
  .about-container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .about-image {
    max-width: 400px;
    margin: 0 auto;
  }

  .about-stats {
    justify-content: center;
  }
}

/* --------------------------------------------------------------------------
   Services/Vakken Section
   -------------------------------------------------------------------------- */
.services {
  background: var(--color-light);
  position: relative;
}

.services::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(13, 115, 119, 0.2), transparent);
}

.section-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto var(--space-2xl);
}

.section-header h2 {
  margin-bottom: var(--space-sm);
}

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

.service-card {
  position: relative;
  padding: var(--space-xl);
  background: var(--color-white);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.service-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

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

.service-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  margin-bottom: var(--space-md);
  font-size: 2rem;
  background: linear-gradient(135deg, rgba(13, 115, 119, 0.1) 0%, rgba(255, 107, 107, 0.1) 100%);
  border-radius: var(--border-radius-sm);
}

.service-card h3 {
  margin-bottom: var(--space-sm);
}

.service-card p {
  font-size: 0.95rem;
  margin-bottom: var(--space-md);
}

.service-topics {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.service-topic {
  padding: 0.25rem 0.75rem;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-primary);
  background: rgba(13, 115, 119, 0.08);
  border-radius: 1rem;
}

.services-grid-2 {
  grid-template-columns: repeat(2, 1fr);
  max-width: 900px;
  margin: 0 auto;
}

@media (max-width: 968px) {
  .services-grid,
  .services-grid-2 {
    grid-template-columns: 1fr;
    max-width: 500px;
    margin: 0 auto;
  }
}

/* --------------------------------------------------------------------------
   AI Section
   -------------------------------------------------------------------------- */
.ai-section {
  background: linear-gradient(135deg, var(--color-dark) 0%, var(--color-dark-soft) 100%);
  color: var(--color-white);
  position: relative;
  overflow: hidden;
}

.ai-section::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 60%;
  height: 150%;
  background: radial-gradient(ellipse at center, rgba(13, 115, 119, 0.3) 0%, transparent 60%);
  pointer-events: none;
}

.ai-section .section-header {
  color: var(--color-white);
}

.ai-section .section-header h2 {
  color: var(--color-white);
}

.ai-section .section-header p {
  color: rgba(255, 255, 255, 0.7);
}

.ai-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  position: relative;
  z-index: 1;
}

.ai-step {
  position: relative;
  padding: var(--space-xl);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius);
  backdrop-filter: blur(10px);
  transition: all var(--transition-base);
}

.ai-step:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-4px);
}

.ai-step-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-md);
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-dark);
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
  border-radius: 50%;
}

.ai-step h3 {
  color: var(--color-white);
  margin-bottom: var(--space-sm);
}

.ai-step p {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.95rem;
}

.ai-highlight {
  margin-top: var(--space-2xl);
  padding: var(--space-xl);
  background: linear-gradient(135deg, rgba(13, 115, 119, 0.3) 0%, rgba(255, 107, 107, 0.2) 100%);
  border-radius: var(--border-radius);
  text-align: center;
  position: relative;
  z-index: 1;
}

.ai-highlight p {
  font-size: 1.25rem;
  color: var(--color-white);
  margin: 0;
}

.ai-highlight strong {
  color: var(--color-accent);
}

@media (max-width: 868px) {
  .ai-grid {
    grid-template-columns: 1fr;
    max-width: 500px;
    margin: 0 auto;
  }
}

/* --------------------------------------------------------------------------
   Testimonial Section
   -------------------------------------------------------------------------- */
.testimonial {
  background: var(--color-white);
}

.testimonial-container {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.testimonial-content {
  padding: var(--space-2xl);
  background: var(--color-light);
  border-radius: var(--border-radius-lg);
  position: relative;
}

.testimonial-content::before {
  content: '"';
  position: absolute;
  top: -20px;
  left: 40px;
  font-family: var(--font-display);
  font-size: 8rem;
  color: var(--color-primary);
  opacity: 0.1;
  line-height: 1;
}

.testimonial-quote {
  font-size: 1.25rem;
  font-style: italic;
  color: var(--color-dark);
  margin-bottom: var(--space-lg);
  position: relative;
  z-index: 1;
}

.testimonial-image {
  max-width: 100%;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-md);
  margin-top: var(--space-lg);
}

/* --------------------------------------------------------------------------
   Contact Section
   -------------------------------------------------------------------------- */
.contact {
  background: var(--color-light);
  position: relative;
}

.contact-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: center;
}

.contact-content h2 {
  margin-bottom: var(--space-md);
}

.contact-content p {
  margin-bottom: var(--space-lg);
}

.contact-methods {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.contact-method {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background: var(--color-white);
  border-radius: var(--border-radius-sm);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.contact-method:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-md);
}

.contact-method-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  font-size: 1.5rem;
  background: linear-gradient(135deg, rgba(13, 115, 119, 0.1) 0%, rgba(255, 107, 107, 0.1) 100%);
  border-radius: var(--border-radius-sm);
}

.contact-method-text {
  flex: 1;
}

.contact-method-label {
  display: block;
  font-size: 0.875rem;
  color: var(--color-muted);
}

.contact-method-value {
  font-weight: 600;
  color: var(--color-dark);
}

.contact-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.contact-card {
  position: relative;
  padding: var(--space-2xl);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  border-radius: var(--border-radius-lg);
  color: var(--color-white);
  text-align: center;
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.contact-card h3 {
  color: var(--color-white);
  margin-bottom: var(--space-sm);
}

.contact-card p {
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: var(--space-lg);
}

.contact-card .btn {
  background: var(--color-white);
  color: var(--color-primary);
}

.contact-card .btn:hover {
  background: var(--color-light);
  transform: translateY(-2px);
}

@media (max-width: 868px) {
  .contact-container {
    grid-template-columns: 1fr;
  }

  .contact-visual {
    order: -1;
  }
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
  padding: var(--space-xl) 0;
  background: var(--color-dark);
  color: rgba(255, 255, 255, 0.6);
  text-align: center;
}

.footer-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}

.footer-logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-white);
}

.footer-logo img {
  height: 60px;
  width: auto;
}

.footer p {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.5);
}

/* --------------------------------------------------------------------------
   Scroll Animations
   -------------------------------------------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered animations */
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }

/* --------------------------------------------------------------------------
   Utilities
   -------------------------------------------------------------------------- */
.text-center {
  text-align: center;
}

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

.text-accent {
  color: var(--color-accent);
}

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }