/* ==========================================================================
   KFA Yenilenebilir Enerji - Master Stylesheet (Mobile PageSpeed & UI/UX Optimized)
   ========================================================================== */

/* Note: Google Fonts loaded via HTML link rel="preconnect" and display=swap for zero FOUT render latency */

:root {
  /* UI/UX Pro Max Palette: Clean Light Slate with Emerald & Solar Accents */
  --clr-bg: #f8fafc;            /* Clean Light Slate Background */
  --clr-bg-surface: #ffffff;    /* Pure White Surface */
  --clr-bg-card: #ffffff;       /* Pure White Card */
  --clr-bg-glass: rgba(255, 255, 255, 0.95);
  --clr-border: #e2e8f0;        /* Light Grey Border */
  --clr-border-glow: rgba(5, 150, 105, 0.35);

  --clr-primary: #059669;       /* Vibrant Emerald Green (4.5:1+ Contrast) */
  --clr-primary-hover: #047857;
  --clr-primary-light: rgba(16, 185, 129, 0.12);

  --clr-secondary: #0284c7;     /* Solar Cyan/Blue */
  --clr-secondary-hover: #0369a1;

  --clr-accent: #d97706;        /* Solar Amber */

  --clr-text-main: #0f172a;     /* Deep Slate Text (#0F172A) for max readability */
  --clr-text-muted: #475569;    /* Slate-600 (#475569) for secondary text */
  --clr-text-dim: #64748b;

  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-body: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;


  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 9999px;

  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 10px 25px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.08);
  --shadow-glow: 0 12px 32px rgba(5, 150, 105, 0.18);

  --transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background-color: var(--clr-bg);
  color: var(--clr-text-main);
  font-family: var(--font-body);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Accessibility Focus Ring (UI/UX Pro Max Priority 1) */
:focus-visible {
  outline: 3px solid var(--clr-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

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

ul {
  list-style: none;
}

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

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  border: none;
  outline: none;
  background: none;
}

/* Cursor Pointer on Interactive Elements (UI/UX Pro Max Rule) */
button, a, select, input[type="submit"], input[type="range"], input[type="checkbox"], .card, .project-card, .blog-card, .faq-question, .facility-btn, .usp-item, .social-icon {
  cursor: pointer;
}

/* Container */
.container {
  width: 100%;
  max-width: 1280px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.25;
  color: var(--clr-text-main);
}

.text-gradient {
  background: linear-gradient(135deg, #059669 0%, #0284c7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.5rem 1.25rem;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid var(--clr-border-glow);
  border-radius: var(--radius-full);
  color: var(--clr-primary);
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1.5rem;
}

.badge-dot {
  width: 8px;
  height: 8px;
  background-color: var(--clr-primary);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--clr-primary);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(5, 150, 105, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 10px rgba(5, 150, 105, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(5, 150, 105, 0); }
}

/* Buttons (UI/UX Pro Max Touch Target Size >= 44px) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 0.95rem 2.25rem;
  min-height: 48px;              /* Touch Target Rule */
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--clr-primary) 0%, #047857 100%);
  color: #ffffff;
  box-shadow: 0 6px 20px rgba(5, 150, 105, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(5, 150, 105, 0.45);
  background: linear-gradient(135deg, #10b981 0%, var(--clr-primary) 100%);
}

.btn-outline {
  background: var(--clr-bg-surface);
  border: 2px solid var(--clr-border);
  color: var(--clr-text-main);
}

.btn-outline:hover {
  background: var(--clr-bg);
  border-color: var(--clr-primary);
  color: var(--clr-primary);
  transform: translateY(-2px);
}

/* Header & Navbar - High Contrast Glassmorphism */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  transition: var(--transition);
  padding: 1rem 0;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.site-header.scrolled {
  padding: 0.6rem 0;
  background: #ffffff;
  box-shadow: var(--shadow-md);
  border-bottom: 1px solid var(--clr-border);
}

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

/* VERY LARGE BOLD LOGO */
.brand-logo img {
  height: 100px;
  max-height: 105px;
  width: auto;
  object-fit: contain;
  filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.06));
  transition: var(--transition);
}

.site-header.scrolled .brand-logo img {
  height: 80px;
  max-height: 85px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2.25rem;
}

.nav-link {
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--clr-text-muted);
  position: relative;
  padding: 0.5rem 0;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 3px;
  background: var(--clr-primary);
  transition: var(--transition);
  border-radius: var(--radius-full);
}

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

.mobile-toggle {
  display: none;
  font-size: 1.8rem;
  color: var(--clr-text-main);
  cursor: pointer;
  background: none;
  border: none;
  min-width: 44px;
  min-height: 44px;
}

/* Hero Section */
.hero {
  position: relative;
  padding-top: 12.5rem;
  padding-bottom: 6rem;
  overflow: hidden;
  background: radial-gradient(circle at 85% 15%, rgba(16, 185, 129, 0.08) 0%, transparent 60%),
              radial-gradient(circle at 15% 85%, rgba(2, 132, 199, 0.06) 0%, transparent 60%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3rem;
  align-items: center;
}

.hero-title {
  font-size: 3.5rem;
  margin-bottom: 1.25rem;
  letter-spacing: -0.02em;
}

.hero-desc {
  font-size: 1.2rem;
  color: var(--clr-text-muted);
  margin-bottom: 2rem;
  max-width: 620px;
}

.usp-list {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}

.usp-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--clr-bg-surface);
  border: 1px solid var(--clr-border);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--clr-text-main);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.usp-item:hover {
  border-color: var(--clr-primary);
  transform: translateY(-2px);
}

.usp-item svg {
  color: var(--clr-primary);
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Uncropped Full Images */
.hero-img-box, .card-img-wrapper, .project-img-box {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--clr-border);
  background: #f1f5f9;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem;
}

.hero-img-box img, .card-img-wrapper img, .project-img {
  width: 100%;
  max-height: 420px;
  object-fit: contain;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.hero-img-box:hover img, .card-img-wrapper:hover img {
  transform: scale(1.03);
}

.hero-stats-card {
  background: var(--clr-bg-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

.hero-stats-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--clr-primary), var(--clr-secondary));
}

/* Tabular Numbers & Zero Layout Shift */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  text-align: center;
}

.stat-item {
  background: var(--clr-bg);
  border: 1px solid var(--clr-border);
  padding: 1.25rem 0.25rem;
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.stat-value, .metric-val {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--clr-primary);
  font-variant-numeric: tabular-nums;
  display: inline-block;
  min-width: 90px;
  text-align: center;
  white-space: nowrap;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--clr-text-muted);
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.05em;
  margin-top: 0.25rem;
}

/* Section Styling */
.section {
  padding: 6rem 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 750px;
  margin: 0 auto 4rem auto;
}

.section-title {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--clr-text-muted);
}

/* Feature & Service Cards */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 3rem;
  align-items: center;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.card {
  background: var(--clr-bg-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 2rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.card:hover {
  transform: translateY(-6px);
  border-color: var(--clr-primary);
  box-shadow: var(--shadow-glow);
}

.card-icon {
  width: 64px;
  height: 64px;
  background: var(--clr-primary-light);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--clr-primary);
  margin-bottom: 1.5rem;
}

.card-title {
  font-size: 1.35rem;
  margin-bottom: 0.75rem;
}

.card-desc {
  color: var(--clr-text-muted);
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
}

/* Projects Grid */
.project-card {
  background: var(--clr-bg-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.project-card:hover {
  transform: translateY(-6px);
  border-color: var(--clr-primary);
  box-shadow: var(--shadow-lg);
}

.project-body {
  padding: 1.75rem;
}

.project-tag {
  font-size: 0.8rem;
  color: var(--clr-secondary);
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.project-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--clr-border);
}

.metric-box {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.metric-lbl {
  font-size: 0.75rem;
  color: var(--clr-text-muted);
}

/* FAQ Accordion Styling */
.faq-section {
  background: var(--clr-bg);
  border-top: 1px solid var(--clr-border);
}

.faq-list {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.faq-item {
  background: var(--clr-bg-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.faq-item:hover {
  border-color: var(--clr-primary);
}

.faq-question {
  width: 100%;
  padding: 1.5rem 2rem;
  min-height: 54px;               /* Touch Target Rule */
  text-align: left;
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--clr-text-main);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  background: none;
}

.faq-question svg {
  color: var(--clr-primary);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

.faq-item.active .faq-question svg {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.16, 1, 0.3, 1), padding 0.4s ease;
  padding: 0 2rem;
  color: var(--clr-text-muted);
  font-size: 1rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 2rem 1.75rem 2rem;
}

/* Savings Calculator Section */
.calc-section {
  background: var(--clr-bg-surface);
  border-top: 1px solid var(--clr-border);
  border-bottom: 1px solid var(--clr-border);
}

.calc-box {
  background: var(--clr-bg-card);
  border: 1px solid var(--clr-border-glow);
  border-radius: var(--radius-lg);
  padding: 3rem;
  box-shadow: var(--shadow-lg);
}

.calc-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.calc-input-group {
  margin-bottom: 2rem;
}

.calc-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
  font-weight: 700;
  font-size: 1.1rem;
}

.calc-value-display {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  color: var(--clr-primary);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.range-slider {
  width: 100%;
  height: 12px;
  background: #e2e8f0;
  border-radius: var(--radius-full);
  outline: none;
  -webkit-appearance: none;
  cursor: pointer;
}

.range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--clr-primary);
  box-shadow: 0 0 15px rgba(5, 150, 105, 0.4);
  cursor: pointer;
  transition: var(--transition);
}

.facility-type-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.facility-btn {
  padding: 0.875rem 0.5rem;
  min-height: 44px;
  background: var(--clr-bg);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  color: var(--clr-text-muted);
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
}

.facility-btn.active, .facility-btn:hover {
  background: var(--clr-primary-light);
  border-color: var(--clr-primary);
  color: var(--clr-primary);
}

.calc-result-card {
  background: var(--clr-bg);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 2.5rem;
  text-align: center;
}

.calc-savings-amount {
  font-family: var(--font-heading);
  font-size: 3.2rem;
  font-weight: 800;
  color: var(--clr-primary);
  line-height: 1.1;
  margin: 0.5rem 0;
  font-variant-numeric: tabular-nums;
}

.calc-impact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--clr-border);
}

.impact-box {
  background: var(--clr-bg-surface);
  padding: 1.25rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--clr-border);
}

.impact-num {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--clr-secondary);
  font-variant-numeric: tabular-nums;
}

.impact-desc {
  font-size: 0.8rem;
  color: var(--clr-text-muted);
}

/* Contact Page & Forms */
.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 3rem;
}

.contact-info-card, .form-card {
  background: var(--clr-bg-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-sm);
}

.info-item {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.info-icon {
  width: 50px;
  height: 50px;
  background: var(--clr-primary-light);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--clr-primary);
  flex-shrink: 0;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
  color: var(--clr-text-main);
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  min-height: 46px;
  padding: 0.875rem 1.25rem;
  background: var(--clr-bg);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  color: var(--clr-text-main);
  transition: var(--transition);
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--clr-primary);
  box-shadow: 0 0 10px rgba(5, 150, 105, 0.2);
  background: #ffffff;
}

.checkbox-group {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.checkbox-group input[type="checkbox"] {
  width: 20px;
  height: 20px;
  accent-color: var(--clr-primary);
  margin-top: 2px;
  cursor: pointer;
}

/* RESPONSIVE FOOTER STYLING */
.site-footer {
  background: #0f172a;
  color: #f8fafc;
  padding-top: 4.5rem;
  padding-bottom: 2.5rem;
  border-top: 2px solid var(--clr-primary);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.8fr 1.1fr 0.8fr;
  gap: 2.5rem;
  margin-bottom: 3.5rem;
  align-items: start;
}

.footer-brand p {
  color: #94a3b8;
  font-size: 0.95rem;
  margin-top: 1.25rem;
  max-width: 320px;
  line-height: 1.6;
}

.footer-brand img {
  height: 95px;
  max-height: 100px;
  width: auto;
  object-fit: contain;
}

.footer-title {
  font-size: 1.15rem;
  margin-bottom: 1.5rem;
  color: #ffffff;
  position: relative;
  font-weight: 700;
}

.footer-title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 36px;
  height: 3px;
  background: var(--clr-primary);
  border-radius: var(--radius-full);
}

.footer-links li {
  margin-bottom: 0.85rem;
}

.footer-links a {
  color: #94a3b8;
  font-size: 0.95rem;
  transition: var(--transition);
}

.footer-links a:hover {
  color: #34d399;
  padding-left: 4px;
}

.social-links {
  display: flex;
  gap: 0.875rem;
  margin-bottom: 1.5rem;
}

.social-icon {
  width: 44px;
  height: 44px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  transition: var(--transition);
}

.social-icon:hover {
  background: var(--clr-primary);
  transform: translateY(-3px);
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
  color: #64748b;
}

/* Blog Components */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.blog-card {
  background: var(--clr-bg-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.blog-card:hover {
  transform: translateY(-6px);
  border-color: var(--clr-primary);
  box-shadow: var(--shadow-lg);
}

.blog-category {
  font-size: 0.8rem;
  color: var(--clr-primary);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.blog-title {
  font-size: 1.2rem;
  margin-bottom: 1rem;
  line-height: 1.4;
}

.blog-desc {
  font-size: 0.9rem;
  color: var(--clr-text-muted);
  margin-bottom: 1.5rem;
}

.blog-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--clr-text-dim);
  border-top: 1px solid var(--clr-border);
  padding-top: 1rem;
}

/* Framer-Motion Style Scroll Animations */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(35px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive Media Queries */
@media (max-width: 1024px) {
  .hero-grid, .calc-grid, .contact-grid, .grid-2 {
    grid-template-columns: 1fr;
  }
  .grid-3, .blog-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .hero-title {
    font-size: 2.75rem;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    height: 100vh;
    background: #ffffff;
    flex-direction: column;
    justify-content: center;
    padding: 3rem;
    transition: var(--transition);
    border-left: 1px solid var(--clr-border);
    box-shadow: -10px 0 30px rgba(0, 0, 0, 0.15);
  }
  .nav-menu.open { right: 0; }
  .mobile-toggle { display: block; z-index: 1100; }
  .grid-3, .grid-4, .blog-grid, .footer-grid { grid-template-columns: 1fr; }
  .brand-logo img { height: 75px; }
  .footer-brand img { height: 80px; }
}