/* ==========================================================================
   Eneco Base Styles — Foundation
   ========================================================================== */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

/* ==========================================================================
   CSS Custom Properties
   ========================================================================== */
:root {
  /* Primair: Eneco rood-oranje gradient */
  --eneco-red: #E3000F;
  --eneco-orange: #FF6B00;
  --eneco-yellow: #FFB000;
  --eneco-gradient: linear-gradient(135deg, #E3000F 0%, #FF6B00 50%, #FFB000 100%);
  --eneco-gradient-hover: linear-gradient(135deg, #C8000D 0%, #E55F00 50%, #E59E00 100%);

  /* Secundair */
  --eneco-dark: #1A1A2E;
  --eneco-charcoal: #2D2D3F;
  --eneco-warm-gray: #F5F0EB;
  --eneco-light-bg: #FAFAF8;
  --eneco-white: #FFFFFF;

  /* Accent / Duurzaamheid */
  --eneco-green: #00A651;
  --eneco-teal: #009B8D;
  --eneco-blue: #0077C8;

  /* Tekst */
  --eneco-text-primary: #1A1A2E;
  --eneco-text-secondary: #5A5A6E;
  --eneco-text-light: #FFFFFF;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --space-5xl: 8rem;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 2px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.08);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.12);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
  --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Container */
  --container-max: 1200px;
  --container-wide: 1400px;
  --container-narrow: 800px;
}

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

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

body {
  font-family: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  font-weight: 400;
  line-height: 1.6;
  color: var(--eneco-text-primary);
  background-color: var(--eneco-white);
  overflow-x: hidden;
}

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

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

a:hover {
  color: var(--eneco-orange);
}

ul, ol {
  list-style: none;
}

input, textarea, select, button {
  font-family: inherit;
  font-size: inherit;
}

/* ==========================================================================
   Typography
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--eneco-text-primary);
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.5rem, 3.5vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.01em;
}

h3 {
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  font-weight: 700;
}

h4 {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  font-weight: 600;
}

p {
  color: var(--eneco-text-secondary);
  line-height: 1.7;
  max-width: 65ch;
}

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

/* ==========================================================================
   Container
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.container--wide {
  max-width: var(--container-wide);
}

.container--narrow {
  max-width: var(--container-narrow);
}

/* ==========================================================================
   Eneco Logo
   ========================================================================== */
.eneco-logo {
  display: inline-flex;
  align-items: center;
  gap: 0;
  text-decoration: none;
  flex-shrink: 0;
}

.eneco-logo img {
  height: 32px;
  width: auto;
  display: block;
}

.eneco-logo--large img {
  height: 40px;
}

.eneco-logo--white img {
  filter: brightness(0) invert(1);
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.75rem 1.75rem;
  border: none;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  line-height: 1.4;
  position: relative;
  overflow: hidden;
}

.btn--primary {
  background: var(--eneco-gradient);
  color: var(--eneco-text-light);
  box-shadow: 0 4px 16px rgba(227, 0, 15, 0.25);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(227, 0, 15, 0.35);
  color: var(--eneco-text-light);
}

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

.btn--secondary {
  background: transparent;
  color: var(--eneco-red);
  border: 2px solid var(--eneco-red);
}

.btn--secondary:hover {
  background: var(--eneco-red);
  color: var(--eneco-text-light);
  transform: translateY(-2px);
}

.btn--ghost {
  background: transparent;
  color: var(--eneco-text-primary);
  padding: 0.5rem 1rem;
}

.btn--ghost:hover {
  color: var(--eneco-red);
}

.btn--white {
  background: var(--eneco-white);
  color: var(--eneco-text-primary);
  box-shadow: var(--shadow-md);
}

.btn--white:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: var(--eneco-text-primary);
}

.btn--lg {
  padding: 1rem 2.25rem;
  font-size: 1.05rem;
}

.btn--sm {
  padding: 0.5rem 1.25rem;
  font-size: 0.85rem;
}

/* ==========================================================================
   Cards
   ========================================================================== */
.card {
  background: var(--eneco-white);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

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

.card--gradient-border {
  border: 2px solid transparent;
  background-clip: padding-box;
}

.card--gradient-border::before {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: inherit;
  background: var(--eneco-gradient);
  z-index: -1;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.card--gradient-border:hover::before {
  opacity: 1;
}

/* ==========================================================================
   Navigation (Sticky Header)
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--eneco-white);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.site-header--scrolled {
  box-shadow: var(--shadow-md);
}

.site-header--dark {
  background: var(--eneco-dark);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

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

.nav-links a {
  color: var(--eneco-text-primary);
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
  padding: 0.25rem 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--eneco-gradient);
  transition: width var(--transition-base);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

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

.site-header--dark .nav-links a {
  color: var(--eneco-text-light);
}

/* Hamburger Menu */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  background: none;
  border: none;
  z-index: 1001;
}

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

.site-header--dark .hamburger span {
  background: var(--eneco-text-light);
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Nav */
.mobile-nav {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--eneco-white);
  z-index: 999;
  padding: 100px var(--space-xl) var(--space-xl);
  flex-direction: column;
  gap: var(--space-lg);
}

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

.mobile-nav a {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--eneco-text-primary);
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--eneco-warm-gray);
}

/* ==========================================================================
   Form Elements
   ========================================================================== */
.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: var(--space-sm);
  color: var(--eneco-text-primary);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 2px solid #E0DCD7;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  color: var(--eneco-text-primary);
  background: var(--eneco-white);
  transition: all var(--transition-fast);
  outline: none;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  border-color: var(--eneco-red);
  box-shadow: 0 0 0 3px rgba(227, 0, 15, 0.1);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: #A9A5A0;
}

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

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%235A5A6E' stroke-width='2' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
}

.form-checkbox {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  cursor: pointer;
}

.form-checkbox input[type="checkbox"] {
  width: 20px;
  height: 20px;
  accent-color: var(--eneco-red);
  cursor: pointer;
}

.form-error {
  color: var(--eneco-red);
  font-size: 0.8rem;
  margin-top: var(--space-xs);
  display: none;
}

.form-group.error .form-input,
.form-group.error .form-textarea,
.form-group.error .form-select {
  border-color: var(--eneco-red);
}

.form-group.error .form-error {
  display: block;
}

/* ==========================================================================
   Section Spacing
   ========================================================================== */
.section {
  padding: var(--space-4xl) 0;
}

.section--gray {
  background: var(--eneco-light-bg);
}

.section--warm {
  background: var(--eneco-warm-gray);
}

.section--dark {
  background: var(--eneco-dark);
  color: var(--eneco-text-light);
}

.section--dark h2,
.section--dark h3,
.section--dark h4 {
  color: var(--eneco-text-light);
}

.section--dark p {
  color: rgba(255, 255, 255, 0.8);
}

.section--gradient {
  background: var(--eneco-gradient);
  color: var(--eneco-text-light);
}

.section--gradient h2,
.section--gradient h3,
.section--gradient p {
  color: var(--eneco-text-light);
}

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

.section-header p {
  margin: var(--space-md) auto 0;
  max-width: 55ch;
}

.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--eneco-red);
  margin-bottom: var(--space-sm);
}

.section--gradient .section-label,
.section--dark .section-label {
  color: var(--eneco-yellow);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background: var(--eneco-dark);
  color: var(--eneco-text-light);
  padding: var(--space-4xl) 0 var(--space-xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-3xl);
  margin-bottom: var(--space-3xl);
}

.footer-brand p {
  color: rgba(255, 255, 255, 0.6);
  margin-top: var(--space-md);
  font-size: 0.9rem;
  max-width: 300px;
}

.footer-col h4 {
  color: var(--eneco-text-light);
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: var(--space-lg);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-col a {
  display: block;
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.9rem;
  padding: var(--space-xs) 0;
  transition: color var(--transition-fast);
}

.footer-col a:hover {
  color: var(--eneco-text-light);
}

.footer-social {
  display: flex;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.footer-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.1);
  color: var(--eneco-text-light);
  transition: all var(--transition-fast);
}

.footer-social a:hover {
  background: var(--eneco-gradient);
  transform: translateY(-2px);
}

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

.footer-bottom p {
  color: rgba(255, 255, 255, 0.4);
  font-size: 0.85rem;
}

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

.footer-bottom-links a {
  color: rgba(255, 255, 255, 0.4);
  font-size: 0.85rem;
}

.footer-bottom-links a:hover {
  color: var(--eneco-text-light);
}

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

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

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ==========================================================================
   Utility Classes
   ========================================================================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.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-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }
.gap-xl { gap: var(--space-xl); }

.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mt-2xl { margin-top: var(--space-2xl); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

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

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }

  .nav-links {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

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

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-md);
  }

  .btn--lg {
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
  }
}