/*
  Energy Analysis Publication - Stylesheet
  ---
  - CSS Variables
  - Base & Reset
  - Typography
  - Layout & Container
  - Header & Navigation
  - Footer
  - Hero Sections
  - Standard Sections
  - Component: Cards
  - Component: Buttons
  - Component: Forms
  - Component: Accordion (FAQ)
  - Component: Testimonials
  - Component: Stats
  - Component: Logo Grid
  - Cookie Banner
  - Utility Classes
  - Responsive Styles
*/

:root {
  --color-primary: #0a2d4d; /* Deep Blue */
  --color-secondary: #0e4c6c; /* Muted Teal Blue */
  --color-accent: #4caf50; /* Subtle Green */
  --color-background-light: #f4f6f8; /* Off-White */
  --color-background-dark: #05192d;
  --color-text-light: #ffffff;
  --color-text-dark: #333333;
  --color-text-muted: #6c757d;
  --font-family-heading: 'Georgia', 'Times New Roman', Times, serif;
  --font-family-body: 'Helvetica Neue', Arial, sans-serif;
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 32px;
  --spacing-xl: 48px;
  --spacing-xxl: 64px;
  --section-padding: clamp(80px, 10vw, 120px);
  --border-radius: 8px;
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 5px 15px rgba(0, 0, 0, 0.1);
  --transition-speed: 300ms ease-in-out;
}

/* --- Base & Reset --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
  font-size: 16px;
}
body {
  font-family: var(--font-family-body);
  color: var(--color-text-dark);
  background-color: var(--color-background-light);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img {
  max-width: 100%;
  height: auto;
  display: block;
}
ul, ol {
  list-style: none;
}
a {
  text-decoration: none;
  color: var(--color-secondary);
  transition: color var(--transition-speed);
}
a:hover {
  color: var(--color-accent);
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family-heading);
  color: var(--color-primary);
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  font-weight: 700;
}
h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); text-align: center; }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: 1.25rem; }
p { margin-bottom: var(--spacing-md); }
.section-subtitle {
  display: block;
  text-align: center;
  max-width: 800px;
  margin: 0 auto var(--spacing-lg);
  color: var(--color-text-muted);
  font-size: clamp(1rem, 1.5vw, 1.1rem);
}
.text-light { color: var(--color-text-light) !important; }
.text-light h1, .text-light h2, .text-light h3 { color: var(--color-text-light) !important; }

/* --- Layout & Container --- */
.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
}
.section {
  padding-top: var(--section-padding);
  padding-bottom: var(--section-padding);
}
.section-bg-dark {
  background-color: var(--color-primary);
}
.section-bg-gray {
  background-color: #ffffff;
}

/* --- Header & Navigation --- */
.header {
  position: sticky;
  top: 0;
  width: 100%;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  transition: background-color var(--transition-speed);
}
.main-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}
.logo {
  font-family: var(--font-family-heading);
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--color-primary);
}
.nav-links {
  display: none;
  gap: var(--spacing-lg);
}
.nav-links a {
  font-weight: 500;
  padding: var(--spacing-sm) 0;
  position: relative;
  color: var(--color-primary);
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-accent);
  transition: width var(--transition-speed);
}
.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}
.nav-links a.active {
  color: var(--color-secondary);
  font-weight: 700;
}
.nav-cta {
  display: none;
}
.hamburger {
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  width: 2rem;
  height: 2rem;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 10;
}
.hamburger span {
  width: 2rem;
  height: 0.25rem;
  background: var(--color-primary);
  border-radius: 10px;
  transition: all 0.3s linear;
  position: relative;
  transform-origin: 1px;
}
.hamburger.open span:nth-child(1) { transform: rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; transform: translateX(20px); }
.hamburger.open span:nth-child(3) { transform: rotate(-45deg); }


/* --- Footer --- */
.footer {
  background-color: var(--color-primary);
  color: var(--color-text-light);
  padding: var(--spacing-xl) 0;
}
.footer a { color: var(--color-background-light); }
.footer a:hover { color: var(--color-accent); }
.footer-grid {
  display: grid;
  gap: var(--spacing-lg);
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  margin-bottom: var(--spacing-xl);
}
.footer-col h4 {
  color: var(--color-text-light);
  margin-bottom: var(--spacing-md);
}
.footer-col ul li {
  margin-bottom: var(--spacing-sm);
}
.footer-bottom {
  border-top: 1px solid var(--color-secondary);
  padding-top: var(--spacing-lg);
  text-align: center;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}
.footer-bottom a { color: var(--color-text-muted); text-decoration: underline; }
.footer-bottom a:hover { color: var(--color-text-light); }

/* --- Hero Sections --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 0 var(--spacing-md);
  background-size: cover;
  background-position: center;
}
.hero-simple { min-height: 40vh; }
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(10, 45, 77, 0.7); /* Based on --color-primary */
}
.hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
}
.hero-content h1 {
  color: var(--color-text-light);
  text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
}
.hero-content p {
  color: rgba(255, 255, 255, 0.9);
  font-size: clamp(1.1rem, 2vw, 1.25rem);
  max-width: 700px;
  margin: var(--spacing-md) auto;
}

/* --- Standard Sections --- */
.two-col-layout {
  display: grid;
  gap: var(--spacing-xl);
  align-items: center;
}
.two-col-layout .image-container {
  aspect-ratio: 4 / 3;
  overflow: hidden;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-md);
}
.two-col-layout img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* --- Component: Cards --- */
.card-grid {
  display: grid;
  gap: var(--spacing-lg);
  grid-template-columns: 1fr;
}
.card {
  background-color: #fff;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: transform var(--transition-speed), box-shadow var(--transition-speed);
  display: flex;
  flex-direction: column;
}
.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}
.card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}
.card-body {
  padding: var(--spacing-lg);
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}
.card-body h3 {
  font-size: 1.25rem;
  margin-top: 0;
}
.card-body p {
  flex-grow: 1;
}
.card-icon {
  font-size: 3rem;
  color: var(--color-accent);
  margin-bottom: var(--spacing-md);
}

/* --- Component: Buttons --- */
.btn {
  display: inline-block;
  padding: 12px 24px;
  font-weight: bold;
  border-radius: var(--border-radius);
  cursor: pointer;
  text-align: center;
  border: 2px solid transparent;
  transition: all var(--transition-speed);
}
.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-text-light);
  border-color: var(--color-accent);
}
.btn-primary:hover {
  background-color: #45a049;
  border-color: #45a049;
  transform: translateY(-2px);
}
.btn-secondary {
  background-color: transparent;
  color: var(--color-text-light);
  border-color: var(--color-text-light);
}
.btn-secondary:hover {
  background-color: var(--color-text-light);
  color: var(--color-primary);
}

/* --- Component: Forms --- */
.form-group {
  margin-bottom: var(--spacing-md);
}
.form-group label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: bold;
}
.form-control {
  width: 100%;
  padding: 12px;
  border: 1px solid #ccc;
  border-radius: var(--border-radius);
  font-size: 1rem;
}
.form-control:focus {
  outline: none;
  border-color: var(--color-secondary);
  box-shadow: 0 0 0 2px rgba(14, 76, 108, 0.2);
}
textarea.form-control {
  min-height: 150px;
  resize: vertical;
}
.contact-info ul {
  line-height: 2;
  margin-top: var(--spacing-md);
}
.contact-info ul li strong {
  color: var(--color-primary);
}

/* --- Component: Accordion (FAQ) --- */
.faq-item {
  border-bottom: 1px solid #e0e0e0;
}
.faq-question {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: var(--spacing-md) 0;
  font-size: 1.1rem;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--color-primary);
}
.faq-question::after {
  content: '+';
  font-size: 1.5rem;
  color: var(--color-accent);
  transition: transform var(--transition-speed);
}
.faq-item.active .faq-question::after {
  transform: rotate(45deg);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-speed), padding var(--transition-speed);
}
.faq-answer p {
  padding-bottom: var(--spacing-md);
  color: var(--color-text-muted);
}
.faq-item.active .faq-answer {
  max-height: 300px; /* Adjust as needed */
}

/* --- Component: Testimonials --- */
.testimonial-card {
  background: #fff;
  padding: var(--spacing-lg);
  border-radius: var(--border-radius);
  text-align: center;
}
.testimonial-img {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto var(--spacing-md);
  border: 3px solid var(--color-accent);
}
.testimonial-quote {
  font-style: italic;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-md);
}
.testimonial-author {
  font-weight: bold;
  color: var(--color-primary);
}
.testimonial-author span {
  display: block;
  font-weight: normal;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* --- Component: Stats --- */
.stats-grid {
  display: grid;
  gap: var(--spacing-lg);
  grid-template-columns: repeat(2, 1fr);
}
.stat-item {
  text-align: center;
}
.stat-number {
  font-size: clamp(3rem, 6vw, 4.5rem);
  font-weight: bold;
  color: var(--color-accent);
  line-height: 1;
}
.stat-label {
  font-size: 1.1rem;
  color: var(--color-background-light);
  font-weight: 500;
}

/* --- Component: Logo Grid --- */
.logo-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
  align-items: center;
}
.logo-grid img {
  max-height: 60px;
  width: auto;
  margin: 0 auto;
  filter: grayscale(100%);
  opacity: 0.7;
  transition: var(--transition-speed);
}
.logo-grid img:hover {
  filter: grayscale(0%);
  opacity: 1;
}

/* --- Generic Content Page --- */
.content-page-body p, .content-page-body ul {
    margin-bottom: var(--spacing-md);
}
.content-page-body ul {
    list-style: disc;
    padding-left: var(--spacing-lg);
}
.content-page-body h3 {
    margin-top: var(--spacing-lg);
}

/* --- Cookie Banner --- */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: rgba(10, 45, 77, 0.95);
  color: #fff;
  padding: var(--spacing-md) var(--spacing-lg);
  z-index: 9999;
  display: none;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}
.cookie-banner-text {
  flex-grow: 1;
  font-size: 0.9rem;
}
.cookie-banner-text a { color: var(--color-accent); }
.cookie-banner-buttons {
  display: flex;
  gap: var(--spacing-sm);
  flex-shrink: 0;
}
.cookie-btn {
  padding: 8px 16px;
  border-radius: var(--border-radius);
  border: none;
  cursor: pointer;
  font-weight: bold;
  transition: var(--transition-speed);
}
.cookie-btn.accept { background-color: var(--color-accent); color: white; }
.cookie-btn.accept:hover { background-color: #45a049; }
.cookie-btn.decline { background-color: #555; color: white; }
.cookie-btn.decline:hover { background-color: #777; }


/* --- Responsive Styles --- */
@media (min-width: 768px) {
  .hamburger {
    display: none;
  }
  .nav-links {
    display: flex;
  }
  .nav-cta {
    display: block;
  }
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .stats-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  .logo-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  .two-col-layout {
    grid-template-columns: 1fr 1fr;
  }
  .two-col-layout.reverse .image-container {
    order: 2;
  }
  .contact-form-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-xl);
  }
}

@media (min-width: 1024px) {
  .card-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .logo-grid {
    grid-template-columns: repeat(6, 1fr);
  }
  #mobile-menu {
    display: none !important;
  }
}

/* Mobile Menu Styles */
#mobile-menu {
    position: fixed;
    top: 80px; /* Below header */
    left: 0;
    width: 100%;
    height: calc(100vh - 80px);
    background-color: var(--color-primary);
    transform: translateX(100%);
    transition: transform 0.3s ease-in-out;
    padding: var(--spacing-xl);
    z-index: 999;
}
#mobile-menu.open {
    transform: translateX(0);
}
#mobile-menu ul {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    gap: var(--spacing-lg);
}
#mobile-menu a {
    color: white;
    font-size: 1.5rem;
    font-weight: bold;
}