/* ==========================================================================
   Marwari Renewables — Stylesheet
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS Custom Properties
   -------------------------------------------------------------------------- */
:root {
  /* Brand colors */
  --color-teal: #0D6E7E;
  --color-teal-dark: #0A5966;
  --color-green: #1A5632;
  --color-green-dark: #143F26;
  --color-gold: #C4A535;
  --color-gold-hover: #D4B53F;
  --color-gold-dark: #A88E2C;
  --color-charcoal: #2D2D2D;

  /* Neutrals */
  --color-bg: #F8F9FA;
  --color-white: #FFFFFF;
  --color-gray-100: #F0F1F2;
  --color-gray-200: #E2E4E6;
  --color-gray-500: #6C757D;
  --color-gray-700: #495057;

  /* Typography */
  --font-heading: 'Plus Jakarta Sans', sans-serif;
  --font-body: 'Inter', sans-serif;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;

  /* Layout */
  --max-width: 1200px;
  --nav-height: 84px;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.7;
  color: var(--color-charcoal);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.25;
}

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

.btn {
  display: inline-block;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  padding: 0.875rem 2.25rem;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color var(--transition-fast),
              transform var(--transition-fast),
              box-shadow var(--transition-fast);
  border: none;
  text-align: center;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

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

.btn-primary {
  background-color: var(--color-gold);
  color: var(--color-charcoal);
}

.btn-primary:hover {
  background-color: var(--color-gold-hover);
}

/* --------------------------------------------------------------------------
   4. Navigation
   -------------------------------------------------------------------------- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--color-white);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  height: var(--nav-height);
}

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

.nav-logo img {
  height: 64px;
  width: auto;
}

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

.nav-links a {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.9375rem;
  color: var(--color-charcoal);
  padding: var(--space-xs) 0;
  position: relative;
  transition: color var(--transition-fast);
}

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

.nav-links a:hover {
  color: var(--color-teal);
}

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

/* Mobile hamburger toggle */
.nav-toggle-checkbox {
  display: none;
}

.nav-toggle-label {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: var(--space-xs);
  z-index: 10;
}

.nav-toggle-label span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-charcoal);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

/* --------------------------------------------------------------------------
   5. Hero Section
   -------------------------------------------------------------------------- */
.hero {
  background: linear-gradient(135deg, var(--color-teal) 0%, var(--color-green) 100%);
  padding: calc(var(--nav-height) + var(--space-2xl)) var(--space-md) var(--space-2xl);
  min-height: 85vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  overflow: hidden;
}

/* Subtle decorative overlay for depth */
.hero::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -20%;
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(255,255,255,0.04) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -15%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(255,255,255,0.03) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero-content {
  max-width: 800px;
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: var(--space-md);
  letter-spacing: -0.02em;
}

.hero-subtext {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: rgba(255, 255, 255, 0.9);
  line-height: 1.8;
  margin-bottom: var(--space-lg);
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
}

/* --------------------------------------------------------------------------
   6. Section Base Styles
   -------------------------------------------------------------------------- */
.section {
  padding: var(--space-2xl) var(--space-md);
}

.section-light {
  background-color: var(--color-white);
}

.section-dark {
  background: linear-gradient(160deg, var(--color-charcoal) 0%, #1a1a2e 100%);
}

.section-accent {
  background: linear-gradient(135deg, var(--color-teal) 0%, var(--color-green) 100%);
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  text-align: center;
  margin-bottom: var(--space-sm);
  color: var(--color-charcoal);
  letter-spacing: -0.01em;
}

.section-title-light {
  color: var(--color-white);
}

.section-intro {
  text-align: center;
  max-width: 740px;
  margin: 0 auto var(--space-xl);
  font-size: 1.0625rem;
  color: var(--color-gray-700);
  line-height: 1.8;
}

.section-intro-light {
  color: rgba(255, 255, 255, 0.85);
}

/* --------------------------------------------------------------------------
   7. About Section
   -------------------------------------------------------------------------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: start;
}

.about-text p {
  margin-bottom: var(--space-md);
  font-size: 1.0625rem;
  color: var(--color-gray-700);
  line-height: 1.8;
}

.about-text strong {
  color: var(--color-charcoal);
}

.about-highlights {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.highlight-card {
  background-color: var(--color-bg);
  border-left: 4px solid var(--color-teal);
  padding: var(--space-md) var(--space-lg);
  border-radius: 0 8px 8px 0;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.highlight-card:hover {
  transform: translateX(4px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
}

.highlight-number {
  display: block;
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-teal);
  line-height: 1.2;
}

.highlight-label {
  font-size: 0.9375rem;
  color: var(--color-gray-700);
  font-weight: 500;
}

/* --------------------------------------------------------------------------
   8. Stats / Opportunity Section
   -------------------------------------------------------------------------- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.stat-card {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  padding: var(--space-lg);
  text-align: center;
  transition: transform var(--transition-fast),
              background-color var(--transition-fast),
              border-color var(--transition-fast);
}

.stat-card:hover {
  transform: translateY(-4px);
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
}

.stat-icon {
  font-size: 2rem;
  margin-bottom: var(--space-sm);
}

.stat-number {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  color: var(--color-gold);
  line-height: 1.2;
}

.stat-unit {
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.7);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-sm);
}

.stat-description {
  font-size: 0.9375rem;
  color: rgba(255, 255, 255, 0.75);
  line-height: 1.7;
}

/* --------------------------------------------------------------------------
   9. Solution Section
   -------------------------------------------------------------------------- */
.solution-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
}

.solution-card {
  background-color: var(--color-bg);
  border-radius: 12px;
  padding: var(--space-lg);
  text-align: center;
  border: 1px solid var(--color-gray-200);
  transition: transform var(--transition-fast),
              box-shadow var(--transition-fast),
              border-color var(--transition-fast);
}

.solution-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
  border-color: var(--color-teal);
}

.solution-icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-sm);
  display: block;
}

.solution-card h3 {
  font-size: 1.125rem;
  color: var(--color-teal);
  margin-bottom: var(--space-xs);
}

.solution-card p {
  font-size: 0.9375rem;
  color: var(--color-gray-700);
  line-height: 1.7;
}

/* --------------------------------------------------------------------------
   10. Contact Section
   -------------------------------------------------------------------------- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  max-width: 900px;
  margin: 0 auto;
}

.contact-card {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 12px;
  padding: var(--space-lg);
  text-align: center;
  transition: background-color var(--transition-fast),
              border-color var(--transition-fast);
}

.contact-card:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.25);
}

.contact-icon {
  font-size: 2rem;
  margin-bottom: var(--space-sm);
}

.contact-card h3 {
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: var(--space-xs);
}

.contact-card p {
  font-size: 1rem;
  color: var(--color-white);
  font-weight: 500;
}

.contact-card a {
  color: var(--color-white);
  border-bottom: 1px solid rgba(255, 255, 255, 0.3);
  padding-bottom: 2px;
  transition: border-color var(--transition-fast);
}

.contact-card a:hover {
  border-color: var(--color-white);
}

/* --------------------------------------------------------------------------
   11. Footer
   -------------------------------------------------------------------------- */
.footer {
  background-color: var(--color-charcoal);
  padding: var(--space-xl) var(--space-md) var(--space-lg);
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  text-align: center;
}

.footer-logo {
  height: 52px;
  width: auto;
  margin: 0 auto;
  opacity: 0.9;
  filter: brightness(0) invert(1);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
}

.footer-zebra {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.5);
  font-style: italic;
}

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

.footer-links a {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.5);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: rgba(255, 255, 255, 0.85);
}

.footer-copy {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.35);
}

/* --------------------------------------------------------------------------
   12. Responsive — Tablet (max-width: 768px)
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  :root {
    --nav-height: 64px;
  }

  /* Mobile navigation */
  .nav-toggle-label {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    flex-direction: column;
    background-color: var(--color-white);
    padding: calc(var(--nav-height) + var(--space-lg)) var(--space-lg) var(--space-lg);
    gap: var(--space-md);
    box-shadow: -4px 0 24px rgba(0, 0, 0, 0.12);
    transition: right var(--transition-base);
    z-index: 5;
  }

  .nav-toggle-checkbox:checked ~ .nav-links {
    right: 0;
  }

  .nav-toggle-checkbox:checked ~ .nav-toggle-label span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav-toggle-checkbox:checked ~ .nav-toggle-label span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle-checkbox:checked ~ .nav-toggle-label span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  /* Hero */
  .hero {
    min-height: 70vh;
    padding-top: calc(var(--nav-height) + var(--space-xl));
  }

  /* About */
  .about-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  /* Stats */
  .stats-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  /* Solution */
  .solution-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
  }

  /* Contact */
  .contact-grid {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }

  /* Sections */
  .section {
    padding: var(--space-xl) var(--space-md);
  }
}

/* --------------------------------------------------------------------------
   13. Responsive — Mobile (max-width: 480px)
   -------------------------------------------------------------------------- */
@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.75rem;
  }

  .hero-subtext {
    font-size: 0.9375rem;
  }

  .solution-grid {
    grid-template-columns: 1fr;
  }

  .btn {
    width: 100%;
    padding: 1rem var(--space-md);
  }

  .highlight-card {
    padding: var(--space-sm) var(--space-md);
  }

  .highlight-number {
    font-size: 1.5rem;
  }

  .stat-card {
    padding: var(--space-md);
  }

  .footer-links {
    flex-direction: column;
    gap: var(--space-xs);
  }
}

/* --------------------------------------------------------------------------
   14. Accessibility & Print
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }
}

/* Focus styles for keyboard navigation */
a:focus-visible,
.btn:focus-visible,
.nav-toggle-label:focus-visible {
  outline: 2px solid var(--color-gold);
  outline-offset: 3px;
  border-radius: 3px;
}

@media print {
  .navbar,
  .hero::before,
  .hero::after {
    display: none;
  }

  .hero {
    background: var(--color-teal) !important;
    min-height: auto;
    padding: var(--space-lg);
  }

  .section {
    padding: var(--space-lg) 0;
    break-inside: avoid;
  }
}