/* ============================================================
   EnergieRegie — style.css
   ============================================================ */

/* 1. CSS Custom Properties
   ============================================================ */
:root {
  --color-orange:  #C85A1E;
  --color-green:   #5F8A3E;
  --color-blue:    #3A6478;
  --color-yellow:  #D4A020;
  --color-navy:    #2D4A5C;

  --color-text:       var(--color-navy);
  --color-text-light: #ffffff;
  --color-bg:         #f4f6f8;
  --color-border:     #d0dbe3;

  --nav-height: 66px;
  --nav-bg:     rgba(45, 74, 92, 0.97);

  --font-body: 'Segoe UI', Arial, sans-serif;
  --line-height: 1.7;

  --space-xs: 0.5rem;
  --space-sm: 0.85rem;
  --space-md: 1.5rem;
  --space-lg: 3rem;

  --container-max: 1100px;
  --radius: 8px;
  --transition: 0.2s ease;
}

/* 2. Reset & Base
   ============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: var(--line-height);
  color: var(--color-text);
  background-color: var(--color-bg);
  background-image: url('background.png');
  background-attachment: fixed;
  background-size: cover;
  background-position: center;
  min-height: 100vh;
}

a {
  color: var(--color-orange);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

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

address {
  font-style: normal;
}

/* 3. Utility
   ============================================================ */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* 4. site-header & logo
   ============================================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--nav-bg);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  z-index: 1000;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  padding: 0 var(--space-md);
  max-width: var(--container-max);
  margin: 0 auto;
}

.logo-link {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.logo-img {
  height: 48px;
  width: auto;
}

/* 5. Main nav (desktop)
   ============================================================ */
.main-nav ul {
  list-style: none;
  display: flex;
  gap: 0.25rem;
  align-items: center;
}

.main-nav a {
  color: var(--color-text-light);
  text-decoration: none;
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius);
  font-size: 0.9rem;
  letter-spacing: 0.02em;
  white-space: nowrap;
  transition: background var(--transition), color var(--transition);
}

.main-nav a:hover {
  background: var(--color-orange);
  color: #fff;
  text-decoration: none;
}

/* 6. Active nav link — CSS-only via body class
   ============================================================ */
.page-index           .main-nav a[href="index.html"],
.page-blijkpolder     .main-nav a[href="blijkpolder.html"],
.page-windpark        .main-nav a[href="windpark-hgp.html"],
.page-thuisbatterijen .main-nav a[href="thuisbatterijen.html"],
.page-bebouwde        .main-nav a[href="bebouwde-omgeving.html"],
.page-tools           .main-nav a[href="tools.html"],
.page-contact         .main-nav a[href="contact.html"] {
  background: var(--color-orange);
  color: #fff;
  font-weight: 600;
}

/* 7. Hamburger button (hidden on desktop)
   ============================================================ */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  margin-left: var(--space-sm);
}

.hamburger-bar {
  display: block;
  width: 26px;
  height: 3px;
  background: #fff;
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

/* Animated X when open */
.nav-toggle[aria-expanded="true"] .hamburger-bar:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .hamburger-bar:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] .hamburger-bar:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* 8. Hero section (index.html)
   ============================================================ */
.hero {
  min-height: 60vh;
  display: flex;
  align-items: center;
  padding: calc(var(--nav-height) + var(--space-lg)) var(--space-md) var(--space-lg);
  background: linear-gradient(
    135deg,
    rgba(45, 74, 92, 0.85) 0%,
    rgba(95, 138, 62, 0.70) 100%
  );
}

.hero-content {
  max-width: 700px;
  color: #fff;
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
  text-shadow: 0 2px 6px rgba(0, 0, 0, 0.35);
  line-height: 1.2;
}

.hero .lead {
  font-size: 1.2rem;
  opacity: 0.92;
  margin-bottom: var(--space-md);
}

.btn-primary {
  display: inline-block;
  padding: 0.8rem 1.8rem;
  background: var(--color-orange);
  color: #fff;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 1rem;
  transition: background var(--transition), transform var(--transition);
  text-decoration: none;
}

.btn-primary:hover {
  background: #a8470f;
  transform: translateY(-2px);
  text-decoration: none;
  color: #fff;
}

/* 9. Page content wrapper
   ============================================================ */
.page-content {
  padding-top: var(--nav-height);
  min-height: calc(100vh - var(--nav-height));
}

/* 10. Content section (inner pages + index about)
   ============================================================ */
.content-section {
  background: rgba(255, 255, 255, 0.90);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border-radius: var(--radius);
  margin: var(--space-lg) auto;
  max-width: var(--container-max);
  padding: var(--space-lg) var(--space-lg);
  box-shadow: 0 4px 24px rgba(45, 74, 92, 0.10);
}

.content-section h1 {
  color: var(--color-blue);
  font-size: 2rem;
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 3px solid var(--color-orange);
}

.content-section h2 {
  color: var(--color-navy);
  font-size: 1.4rem;
  margin: var(--space-lg) 0 var(--space-sm);
}

.content-section p {
  margin-bottom: var(--space-md);
  max-width: 72ch;
}

.content-section p.lead {
  font-size: 1.1rem;
  color: var(--color-blue);
  font-weight: 500;
}

/* 11. Project card grid (index.html)
   ============================================================ */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.card {
  background: #fff;
  border-radius: var(--radius);
  padding: var(--space-md);
  border-top: 4px solid var(--color-green);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.07);
  transition: transform var(--transition), box-shadow var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.13);
}

.card h3 {
  color: var(--color-blue);
  margin-bottom: var(--space-xs);
  font-size: 1.1rem;
}

.card p {
  font-size: 0.93rem;
  color: #4a5f6e;
  margin-bottom: var(--space-sm);
}

.card a {
  color: var(--color-orange);
  font-weight: 600;
  font-size: 0.9rem;
}

/* 12. Contact layout & form
   ============================================================ */
.contact-layout {
  display: flex;
  gap: var(--space-lg);
  flex-wrap: wrap;
  align-items: flex-start;
}

.contact-details {
  min-width: 220px;
}

.contact-details address {
  line-height: 2;
  color: var(--color-text);
}

.contact-details a {
  color: var(--color-orange);
}

.contact-form-wrapper {
  flex: 1;
  min-width: 280px;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  max-width: 560px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.form-group label {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-navy);
}

.form-group input,
.form-group textarea {
  padding: 0.65rem 0.9rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--color-text);
  background: #fff;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-blue);
  box-shadow: 0 0 0 3px rgba(58, 100, 120, 0.15);
}

.form-group textarea {
  resize: vertical;
  min-height: 140px;
}

.btn-submit {
  align-self: flex-start;
  padding: 0.75rem 2rem;
  background: var(--color-green);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
}

.btn-submit:hover {
  background: #4a6e2f;
  transform: translateY(-2px);
}

/* 13. Footer
   ============================================================ */
.site-footer {
  background: var(--color-navy);
  color: rgba(255, 255, 255, 0.70);
  text-align: center;
  padding: var(--space-md) var(--space-md);
  font-size: 0.85rem;
  margin-top: var(--space-lg);
}

.site-footer a {
  color: var(--color-yellow);
}

.site-footer a:hover {
  color: #fff;
}

/* 14. Media queries
   ============================================================ */
@media (max-width: 768px) {
  /* Show hamburger button */
  .nav-toggle {
    display: flex;
  }

  /* Collapse nav into dropdown */
  .main-nav {
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--nav-bg);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
  }

  .main-nav.is-open {
    max-height: 480px;
  }

  .main-nav ul {
    flex-direction: column;
    gap: 0;
    padding: var(--space-xs) 0;
  }

  .main-nav a {
    display: block;
    padding: 0.8rem var(--space-md);
    border-radius: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    font-size: 1rem;
  }

  /* Active link on mobile */
  .page-index           .main-nav a[href="index.html"],
  .page-blijkpolder     .main-nav a[href="blijkpolder.html"],
  .page-windpark        .main-nav a[href="windpark-hgp.html"],
  .page-thuisbatterijen .main-nav a[href="thuisbatterijen.html"],
  .page-bebouwde        .main-nav a[href="bebouwde-omgeving.html"],
  .page-tools           .main-nav a[href="tools.html"],
  .page-contact         .main-nav a[href="contact.html"] {
    background: var(--color-orange);
  }

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

  .hero .lead {
    font-size: 1rem;
  }

  /* Content section */
  .content-section {
    margin: var(--space-md);
    padding: var(--space-md);
  }

  /* Card grid: single column */
  .card-grid {
    grid-template-columns: 1fr;
  }

  /* Contact layout: stack vertically */
  .contact-layout {
    flex-direction: column;
    gap: var(--space-md);
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.5rem;
  }

  .content-section h1 {
    font-size: 1.5rem;
  }
}