/* ============================================
   VERTEON RENEWABLES — Design System
   Kinetic Sustainability Theme
   ============================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=Manrope:wght@600;700;800;900&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Material+Symbols+Outlined:wght,FILL@100..700,0..1&display=swap');

/* --- Design Tokens --- */
:root {
  /* Colors */
  --surface: #f7f9fb;
  --surface-dim: #d8dadc;
  --surface-bright: #f7f9fb;
  --surface-container-lowest: #ffffff;
  --surface-container-low: #f2f4f6;
  --surface-container: #eceef0;
  --surface-container-high: #e6e8ea;
  --surface-container-highest: #e0e3e5;
  --on-surface: #191c1e;
  --on-surface-variant: #3c4a42;
  --inverse-surface: #2d3133;
  --inverse-on-surface: #eff1f3;
  --outline: #6c7a71;
  --outline-variant: #bbcabf;
  --surface-tint: #006c49;
  --primary: #006c49;
  --on-primary: #ffffff;
  --primary-container: #10b981;
  --on-primary-container: #00422b;
  --inverse-primary: #4edea3;
  --secondary: #565e74;
  --on-secondary: #ffffff;
  --secondary-container: #dae2fd;
  --tertiary: #005ac2;
  --on-tertiary: #ffffff;
  --tertiary-container: #71a1ff;
  --tertiary-fixed: #d8e2ff;
  --tertiary-fixed-dim: #adc6ff;
  --error: #ba1a1a;
  --on-error: #ffffff;
  --background: #f7f9fb;
  --on-background: #191c1e;

  /* Spacing */
  --base: 8px;
  --gutter: 24px;
  --content-gap: 48px;
  --margin-safe: 80px;
  --section-gap: 120px;

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07);
}

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

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

body {
  font-family: 'Inter', sans-serif;
  font-size: 16px;
  line-height: 1.5;
  font-weight: 400;
  color: var(--on-surface);
  background: var(--background);
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }
button { border: none; cursor: pointer; font-family: inherit; background: none; }

::selection { background: var(--primary-container); color: var(--on-primary-container); }

/* --- Typography --- */
.display-xl {
  font-family: 'Manrope', sans-serif;
  font-size: clamp(40px, 6vw, 80px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.04em;
}
.display-lg {
  font-family: 'Manrope', sans-serif;
  font-size: clamp(32px, 4.5vw, 56px);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
}
.headline-md {
  font-family: 'Manrope', sans-serif;
  font-size: clamp(22px, 2.5vw, 32px);
  font-weight: 600;
  line-height: 1.3;
}
.body-lg {
  font-family: 'Inter', sans-serif;
  font-size: 18px;
  font-weight: 400;
  line-height: 1.6;
}
.body-md {
  font-family: 'Inter', sans-serif;
  font-size: 16px;
  font-weight: 400;
  line-height: 1.5;
}
.label-caps {
  font-family: 'Inter', sans-serif;
  font-size: 12px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* --- Layout --- */
.container {
  max-width: 1440px;
  margin: 0 auto;
  padding-left: var(--margin-safe);
  padding-right: var(--margin-safe);
  width: 100%;
}
.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--gutter);
}

/* --- Material Icons --- */
.material-symbols-outlined {
  font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
  vertical-align: middle;
}
.icon-filled {
  font-variation-settings: 'FILL' 1, 'wght' 400, 'GRAD' 0, 'opsz' 24;
}

/* =====================
   HEADER / NAV
   ===================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid #e2e8f0;
  transition: background 0.3s, box-shadow 0.3s;
}
.site-header.scrolled {
  background: rgba(255,255,255,0.95);
  box-shadow: var(--shadow-md);
}
.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--margin-safe);
}
.logo {
  display: flex;
  align-items: center;
  gap: 8px;
}
.logo .material-symbols-outlined { color: var(--primary); }
.logo-text {
  font-family: 'Manrope', sans-serif;
  font-size: 24px;
  font-weight: 900;
  letter-spacing: -0.04em;
  color: var(--on-surface);
}

/* Desktop Nav */
.nav-links {
  display: flex;
  gap: 32px;
  align-items: center;
  height: 100%;
}
.nav-links a {
  font-family: 'Manrope', sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
  font-size: 13px;
  color: #475569;
  display: flex;
  align-items: center;
  height: 100%;
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
  transition: color 0.3s, border-color 0.3s;
}
.nav-links a:hover, .nav-links a.active {
  color: #059669;
  border-bottom-color: #059669;
}

/* CTA Button */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--on-surface);
  color: var(--on-primary);
  font-family: 'Inter', sans-serif;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 14px 28px;
  border-radius: var(--radius-full);
  transition: background 0.3s, transform 0.15s;
}
.btn-primary:hover { background: var(--primary); transform: scale(1.03); }
.btn-primary:active { transform: scale(0.97); }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--on-surface);
  color: var(--on-surface);
  font-family: 'Inter', sans-serif;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 14px 28px;
  border-radius: var(--radius-full);
  transition: background 0.3s, transform 0.15s;
}
.btn-secondary:hover { background: var(--surface-container-high); }
.btn-secondary:active { transform: scale(0.97); }

/* Mobile Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  cursor: pointer;
  z-index: 200;
}
.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--on-surface);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile Nav Overlay */
.mobile-nav {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(20px);
  z-index: 90;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 32px;
  opacity: 0;
  transition: opacity 0.3s;
}
.mobile-nav.open { display: flex; opacity: 1; }
.mobile-nav a {
  font-family: 'Manrope', sans-serif;
  font-size: 24px;
  font-weight: 700;
  color: var(--on-surface);
  transition: color 0.2s;
}
.mobile-nav a:hover { color: var(--primary); }

/* =====================
   HERO SECTION
   ===================== */
.hero {
  padding-top: var(--section-gap);
  padding-bottom: var(--section-gap);
}
.hero-grid {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: var(--gutter);
  align-items: center;
}
.hero-content { display: flex; flex-direction: column; gap: var(--base); z-index: 2; }
.hero-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
}
.hero-badge .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary-container);
}
.hero h1 { margin-bottom: 24px; }
.hero h1 .text-primary { color: var(--primary); }
.hero-desc {
  max-width: 540px;
  margin-bottom: 32px;
  color: var(--on-surface-variant);
}
.hero-buttons { display: flex; gap: 16px; flex-wrap: wrap; }

/* Hero Image */
.hero-image-wrap {
  position: relative;
  height: 600px;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid rgba(187,202,191,0.3);
}
.hero-image-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.hero-overlay {
  position: absolute;
  bottom: 24px;
  left: 24px;
  right: 24px;
  background: rgba(247,249,251,0.8);
  backdrop-filter: blur(12px);
  padding: 24px;
  border-radius: var(--radius);
  border: 1px solid rgba(187,202,191,0.2);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.hero-overlay .status-label { margin-bottom: 4px; }
.hero-overlay .status-value {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 18px;
  font-weight: 600;
}
.pulse-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--primary-container);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(1.15); }
}
.hero-overlay .load-value {
  font-family: 'Manrope', sans-serif;
  font-size: 32px;
  font-weight: 600;
  color: var(--primary);
}

/* =====================
   STATS DIVIDER
   ===================== */
.stats-bar {
  background: var(--surface-container-low);
  border-top: 1px solid rgba(187,202,191,0.2);
  border-bottom: 1px solid rgba(187,202,191,0.2);
  padding-top: var(--content-gap);
  padding-bottom: var(--content-gap);
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--gutter);
}
.stat-item {
  padding: 0 24px;
  border-left: 1px solid rgba(187,202,191,0.2);
}
.stat-item:first-child { border-left: none; }
.stat-number {
  font-family: 'Manrope', sans-serif;
  font-size: clamp(32px, 4.5vw, 56px);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--on-surface);
  margin-bottom: 8px;
}

/* =====================
   BENTO GRID SECTION
   ===================== */
.solutions-section { padding-top: var(--section-gap); padding-bottom: var(--section-gap); }
.solutions-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: var(--content-gap);
  gap: 24px;
  flex-wrap: wrap;
}
.solutions-header .display-lg { margin-bottom: 16px; }
.solutions-header p { max-width: 640px; color: var(--on-surface-variant); }

.bento-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--gutter);
  grid-auto-rows: 300px;
}
.bento-card {
  background: var(--surface-bright);
  border-radius: var(--radius-md);
  border: 1px solid rgba(187,202,191,0.3);
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
  transition: border-color 0.3s;
}
.bento-card:hover { border-color: rgba(0,108,73,0.4); }
.bento-card .icon { font-size: 28px; margin-bottom: 16px; }
.bento-card .icon.primary { color: var(--primary); }
.bento-card .icon.tertiary { color: var(--tertiary); }
.bento-card h3 { margin-bottom: 8px; }
.bento-card p { color: var(--on-surface-variant); }
.bento-card .card-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: auto;
  width: max-content;
  font-family: 'Inter', sans-serif;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: transform 0.3s;
}
.bento-card:hover .card-link { transform: translateX(8px); }
.bento-card .card-link.primary { color: var(--primary); }
.bento-card .card-bg-shape {
  position: absolute;
  right: 0;
  bottom: 0;
  width: 50%;
  height: 120%;
  background: var(--surface-container-low);
  transform: translate(40px, 40px);
  border-top-left-radius: 100%;
  opacity: 0.5;
  transition: background 0.3s;
}
.bento-card:hover .card-bg-shape { background: rgba(0,108,73,0.05); }

.col-span-8 { grid-column: span 8; }
.col-span-4 { grid-column: span 4; }

/* =====================
   ABOUT PAGE — HERO
   ===================== */
.about-hero { padding-top: var(--section-gap); padding-bottom: var(--section-gap); }
.about-hero-grid {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: var(--gutter);
  align-items: center;
}
.about-hero-image {
  height: 600px;
  border-radius: var(--radius-md);
  overflow: hidden;
  position: relative;
}
.about-hero-image img { width: 100%; height: 100%; object-fit: cover; }
.about-hero-image .tint {
  position: absolute;
  inset: 0;
  background: rgba(0,108,73,0.1);
}

/* =====================
   IMPACT STATS BENTO
   ===================== */
.impact-section {
  background: var(--surface-container-low);
  padding: var(--section-gap) var(--margin-safe);
  border-radius: 24px;
  margin-bottom: var(--section-gap);
}
.impact-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto var(--content-gap);
}
.impact-header p { color: var(--on-surface-variant); margin-top: 16px; }
.impact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  grid-auto-rows: 300px;
}
.impact-card {
  background: var(--surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--outline-variant);
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.impact-card .icon { font-size: 32px; margin-bottom: 16px; }
.impact-card .big-number {
  font-family: 'Manrope', sans-serif;
  font-size: clamp(40px, 6vw, 80px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.04em;
}
.impact-card .unit {
  font-family: 'Manrope', sans-serif;
  font-size: 32px;
  font-weight: 600;
  margin-left: 8px;
}
.impact-card .unit.primary { color: var(--primary); }
.impact-card .unit.tertiary { color: var(--tertiary); }
.impact-card .card-desc { color: var(--on-surface-variant); margin-top: 8px; }

.impact-wide { grid-column: span 2; }
.chart-bars {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  width: 256px;
  height: 128px;
  opacity: 0.8;
}
.chart-bars .bar {
  flex: 1;
  border-radius: 2px 2px 0 0;
}
.impact-bottom { display: flex; gap: 24px; }
.mission-card {
  background: var(--primary-container);
  color: var(--on-primary-container);
  border-radius: var(--radius-md);
  padding: 32px;
  display: flex;
  align-items: center;
  grid-column: span 2;
}

/* =====================
   TECHNOLOGY SECTION
   ===================== */
.tech-section {
  padding-top: 0;
  padding-bottom: var(--section-gap);
}
.tech-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.tech-image-wrap {
  position: relative;
}
.tech-image-shadow {
  position: absolute;
  inset: 0;
  background: var(--surface-container-high);
  transform: translate(16px, 16px);
  border-radius: var(--radius-md);
  z-index: -1;
}
.tech-image-wrap img {
  border-radius: var(--radius-md);
  object-fit: cover;
  width: 100%;
  height: 500px;
  border: 1px solid var(--outline-variant);
}
.tech-features { display: flex; flex-direction: column; gap: 32px; }
.tech-feature {
  display: flex;
  gap: 16px;
}
.tech-feature .icon-wrap { flex-shrink: 0; margin-top: 4px; }
.tech-feature .icon-wrap .material-symbols-outlined {
  color: var(--primary);
  font-size: 24px;
}
.tech-feature h3 { margin-bottom: 8px; }
.tech-feature p { color: var(--on-surface-variant); }

/* =====================
   FOOTER
   ===================== */
.site-footer {
  background: #f8fafc;
  border-top: 1px solid #e2e8f0;
  padding: 80px var(--margin-safe);
}
.footer-inner {
  max-width: 1440px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 48px;
}
.footer-brand { margin-bottom: 24px; }
.footer-brand .logo { margin-bottom: 24px; }
.footer-brand p {
  font-family: 'Manrope', sans-serif;
  font-size: 14px;
  color: #64748b;
}
.footer-col h4 { margin-bottom: 16px; }
.footer-col ul { display: flex; flex-direction: column; gap: 12px; }
.footer-col a {
  font-family: 'Manrope', sans-serif;
  font-size: 14px;
  color: #64748b;
  display: block;
  transition: color 0.2s, transform 0.2s;
}
.footer-col a:hover { color: #059669; transform: translateX(4px); }
.footer-col a.active { color: #059669; font-weight: 700; }

/* =====================
   SCROLL REVEAL
   ===================== */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}
.reveal.visible {
  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; }

/* =====================
   RESPONSIVE
   ===================== */
@media (max-width: 1024px) {
  :root { --margin-safe: 48px; --section-gap: 80px; }
  .hero-grid, .about-hero-grid { grid-template-columns: 1fr; }
  .hero-image-wrap, .about-hero-image { height: 400px; }
  .bento-grid { grid-template-columns: repeat(2, 1fr); grid-auto-rows: auto; }
  .col-span-8, .col-span-4 { grid-column: span 1; }
  .bento-card { min-height: 260px; }
  .impact-grid { grid-template-columns: 1fr 1fr; }
  .impact-wide { grid-column: span 2; }
  .mission-card { grid-column: span 2; }
  .tech-grid { grid-template-columns: 1fr; gap: 40px; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  :root { --margin-safe: 24px; --section-gap: 60px; --content-gap: 32px; }
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .header-inner .btn-primary.desktop-only { display: none; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-item { border-left: none; padding: 16px 8px; }
  .stat-item:nth-child(odd) { border-right: 1px solid rgba(187,202,191,0.2); }
  .bento-grid { grid-template-columns: 1fr; }
  .col-span-8, .col-span-4 { grid-column: span 1; }
  .impact-grid { grid-template-columns: 1fr; }
  .impact-wide, .mission-card { grid-column: span 1; }
  .solutions-header { flex-direction: column; align-items: flex-start; }
  .footer-inner { grid-template-columns: 1fr; gap: 32px; }
  .hero-overlay { flex-direction: column; gap: 16px; align-items: flex-start; }
  .hero-overlay .text-right { text-align: left; }
}

@media (max-width: 480px) {
  :root { --margin-safe: 20px; }
  .hero-image-wrap, .about-hero-image { height: 300px; }
  .hero-buttons { flex-direction: column; }
  .hero-buttons .btn-primary, .hero-buttons .btn-secondary { width: 100%; justify-content: center; }
  .stat-item { padding: 12px 4px; }
}