/* ==========================================================================
   MAHAKAL SHIVSHAKTI COAL TRANSPORT ENTERPRISE - DESIGN SYSTEM & ANIMATIONS
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@500;600;700;800&display=swap');

:root {
  /* Brand Palette - Clean Corporate Industrial */
  --clr-bg-dark: #0f172a;
  --clr-bg-dark-surface: #1e293b;
  --clr-bg-light: #f8fafc;
  --clr-bg-white: #ffffff;
  
  --clr-primary: #d97706;        /* Warm Amber */
  --clr-primary-hover: #b45309;  /* Deep Copper Gold */
  --clr-primary-light: #fffbe6;  /* Soft Warm Light Tint */
  --clr-accent: #f59e0b;

  --clr-text-dark: #0f172a;
  --clr-text-muted: #475569;
  --clr-text-light: #f8fafc;
  --clr-text-light-muted: #94a3b8;
  
  --clr-border: #e2e8f0;
  --clr-border-dark: #334155;

  /* Typography */
  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  /* Layout & Spacing */
  --max-width: 1240px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 10px 24px rgba(15, 23, 42, 0.08);
}

/* Page Transition Keyframe Animations & View Transitions */
@keyframes pageFadeIn {
  0% {
    opacity: 0;
    transform: translateY(15px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pageFadeOut {
  0% {
    opacity: 1;
    transform: translateY(0);
  }
  100% {
    opacity: 0;
    transform: translateY(-15px);
  }
}

/* Native CSS View Transition API Support */
@supports (view-transition-name: none) {
  ::view-transition-old(root) {
    animation: 0.35s cubic-bezier(0.4, 0, 0.2, 1) both pageFadeOut;
  }
  ::view-transition-new(root) {
    animation: 0.35s cubic-bezier(0.4, 0, 0.2, 1) both pageFadeIn;
  }
}

/* Fallback Smooth Page Transition Overlay */
.page-transition-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: var(--clr-bg-dark);
  z-index: 99999;
  pointer-events: none;
  opacity: 0;
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform 0.35s cubic-bezier(0.77, 0, 0.175, 1), opacity 0.25s ease;
}

.page-transition-overlay.active {
  opacity: 1;
  transform: scaleY(1);
  pointer-events: all;
}

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

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

body {
  font-family: var(--font-body);
  background-color: var(--clr-bg-light);
  color: var(--clr-text-dark);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  animation: pageFadeIn 0.45s ease-out;
}

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

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--clr-text-dark);
}

.text-primary { color: var(--clr-primary); }
.text-muted { color: var(--clr-text-muted); }
.text-light { color: var(--clr-text-light); }

/* Containers & Layout Elements */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section-padding {
  padding: 4.5rem 0;
}

.bg-dark {
  background-color: var(--clr-bg-dark);
  color: var(--clr-text-light);
}

.bg-dark h1, .bg-dark h2, .bg-dark h3, .bg-dark h4 {
  color: var(--clr-text-light);
}

.bg-white {
  background-color: var(--clr-bg-white);
}

/* Header & Navigation Bar */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: #0f172a;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--clr-text-light);
}

.brand-logo .logo-icon {
  width: 44px;
  height: 44px;
  background: var(--clr-primary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
}

.brand-logo span.highlight {
  color: var(--clr-primary);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-link {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--clr-text-light-muted);
  position: relative;
  padding: 0.5rem 0;
}

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

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: var(--clr-primary);
  border-radius: 2px;
}

.header-cta {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--clr-text-light);
  font-size: 1.6rem;
  cursor: pointer;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.btn-primary {
  background-color: var(--clr-primary);
  color: #ffffff;
}

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

.btn-outline-light {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.25);
  color: var(--clr-text-light);
}

.btn-outline-light:hover {
  border-color: var(--clr-primary);
  color: var(--clr-primary);
}

.btn-dark {
  background-color: var(--clr-bg-dark);
  color: #ffffff;
}

/* Hero Section - Filling Full Viewport Height */
.hero-section {
  position: relative;
  min-height: calc(100vh - 76px); /* Exact Viewport Fill Minus Header Height */
  display: flex;
  align-items: center;
  background-color: var(--clr-bg-dark);
  background-image: linear-gradient(to right, rgba(15, 23, 42, 0.92) 40%, rgba(15, 23, 42, 0.7)), url('../images/hero_bg.jpg');
  background-size: cover;
  background-position: center;
  color: var(--clr-text-light);
}

.hero-content {
  max-width: 780px;
  position: relative;
  z-index: 2;
  padding: 2rem 0;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.9rem;
  background: rgba(217, 119, 6, 0.15);
  border: 1px solid rgba(217, 119, 6, 0.4);
  border-radius: 4px;
  color: var(--clr-accent);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  margin-bottom: 1.25rem;
}

.hero-title {
  font-size: 3.4rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 1.25rem;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.hero-description {
  font-size: 1.2rem;
  color: var(--clr-text-light-muted);
  margin-bottom: 2.25rem;
  max-width: 680px;
  line-height: 1.6;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Section Headers */
.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 3rem auto;
}

.section-subtitle {
  font-family: var(--font-heading);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--clr-primary);
  margin-bottom: 0.4rem;
  display: block;
}

.section-title {
  font-size: 2.3rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--clr-text-dark);
}

.bg-dark .section-title {
  color: var(--clr-text-light);
}

.section-description {
  font-size: 1rem;
  color: var(--clr-text-muted);
  margin-top: 0.5rem;
}

.bg-dark .section-description {
  color: var(--clr-text-light-muted);
}

/* Intro Cards Grid */
.intro-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.75rem;
}

.intro-card {
  background: var(--clr-bg-white);
  padding: 2rem 1.75rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--clr-border);
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast);
}

.intro-card:hover {
  border-color: var(--clr-primary);
}

.card-icon {
  width: 50px;
  height: 50px;
  background-color: var(--clr-primary-light);
  color: var(--clr-primary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
}

.intro-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.6rem;
}

.intro-card p {
  color: var(--clr-text-muted);
  font-size: 0.95rem;
}

/* Joint Venture Section */
.companies-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 2rem;
  margin-top: 1.5rem;
}

.company-card {
  background-color: var(--clr-bg-dark-surface);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.company-img {
  height: 220px;
  width: 100%;
  object-fit: cover;
}

.company-body {
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.company-badge {
  align-self: flex-start;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 700;
  padding: 0.25rem 0.65rem;
  border-radius: 4px;
  background-color: rgba(217, 119, 6, 0.2);
  color: var(--clr-accent);
  margin-bottom: 0.75rem;
}

.company-title {
  font-size: 1.4rem;
  color: var(--clr-text-light);
  margin-bottom: 0.75rem;
}

.company-desc {
  color: var(--clr-text-light-muted);
  font-size: 0.92rem;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

/* Company & Feature Lists */
.company-features {
  list-style: none;
  margin-bottom: 1.25rem;
  padding: 0;
}

.company-features li {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.92rem;
  margin-bottom: 0.45rem;
  font-weight: 500;
}

.bg-dark .company-features li {
  color: var(--clr-text-light);
}

.bg-white .company-features li {
  color: var(--clr-text-dark) !important;
}

.company-features li i {
  color: var(--clr-primary);
  font-size: 1.1rem;
  flex-shrink: 0;
}

/* Statistics Banner */
.stats-banner {
  background: var(--clr-bg-dark);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  text-align: center;
}

.stat-item {
  padding: 1rem;
}

.stat-number {
  font-family: var(--font-heading);
  font-size: 3.2rem;
  font-weight: 800;
  color: var(--clr-primary);
  line-height: 1;
  margin-bottom: 0.4rem;
}

.stat-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--clr-text-light-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Services Cards */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.75rem;
}

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

.service-card-img {
  height: 190px;
  width: 100%;
  object-fit: cover;
}

.service-card-body {
  padding: 1.5rem;
}

.service-card-title {
  font-size: 1.2rem;
  margin-bottom: 0.6rem;
}

.service-card-desc {
  color: var(--clr-text-muted);
  font-size: 0.92rem;
  line-height: 1.55;
  margin-bottom: 1rem;
}

.service-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-weight: 700;
  font-size: 0.88rem;
  color: var(--clr-primary);
}

/* Client Marquee */
.client-marquee {
  overflow: hidden;
  user-select: none;
  display: flex;
  gap: 3rem;
  padding: 1.25rem 0;
}

.marquee-track {
  display: flex;
  gap: 3rem;
  align-items: center;
  white-space: nowrap;
  animation: scrollMarquee 25s linear infinite;
}

@keyframes scrollMarquee {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

.client-logo-box {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  color: var(--clr-text-light);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
}

/* Compact Form Card */
.form-card-container {
  max-width: 680px;
  margin: 0 auto;
}

.form-card {
  background: var(--clr-bg-white);
  padding: 2rem 2rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--clr-border);
  box-shadow: var(--shadow-md);
}

.bg-dark .form-card {
  background: var(--clr-bg-dark-surface);
  border-color: rgba(255, 255, 255, 0.1);
}

.form-group {
  margin-bottom: 1.15rem;
}

.form-label {
  display: block;
  font-weight: 600;
  font-size: 0.88rem;
  margin-bottom: 0.35rem;
  color: var(--clr-text-dark);
}

.bg-dark .form-label {
  color: var(--clr-text-light);
}

.form-control {
  width: 100%;
  padding: 0.7rem 0.95rem;
  font-family: var(--font-body);
  font-size: 0.92rem;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-sm);
  background-color: var(--clr-bg-light);
  color: var(--clr-text-dark);
  outline: none;
}

.bg-dark .form-control {
  background-color: rgba(15, 23, 42, 0.6);
  border-color: rgba(255, 255, 255, 0.15);
  color: var(--clr-text-light);
}

.form-control:focus {
  border-color: var(--clr-primary);
}

textarea.form-control {
  resize: vertical;
  min-height: 95px;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.15rem;
}

/* Toast Notifications */
.toast-notification {
  position: fixed;
  bottom: 25px;
  right: 25px;
  z-index: 9999;
  background-color: #065f46;
  color: #ffffff;
  padding: 0.85rem 1.5rem;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  font-weight: 600;
  font-size: 0.92rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.3s ease;
}

.toast-notification.show {
  transform: translateY(0);
  opacity: 1;
}

/* Contact Info Cards */
.contact-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3.5rem;
}

.contact-info-card {
  background: var(--clr-bg-white);
  padding: 1.75rem 1.5rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--clr-border);
  box-shadow: var(--shadow-sm);
  text-align: center;
}

.contact-info-card i {
  font-size: 2rem;
  color: var(--clr-primary);
  margin-bottom: 0.75rem;
}

.contact-info-card h4 {
  font-size: 1.15rem;
  margin-bottom: 0.4rem;
}

.contact-info-card p {
  color: var(--clr-text-muted);
  font-size: 0.9rem;
}

/* Footer */
.site-footer {
  background-color: #0b1120;
  color: var(--clr-text-light-muted);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 3.5rem 0 2rem 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2.5rem;
  margin-bottom: 3rem;
}

.footer-col h4 {
  color: var(--clr-text-light);
  font-size: 1.1rem;
  margin-bottom: 1rem;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.5rem;
  font-size: 0.92rem;
}

.footer-links a:hover {
  color: var(--clr-primary);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 1.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
}

/* Responsive Scaling for Tablets & Mobile */
@media (max-width: 1024px) {
  .hero-section { min-height: calc(100vh - 76px); }
  .hero-title { font-size: 2.7rem; }
  .section-title { font-size: 2rem; }
  .form-row { grid-template-columns: 1fr; gap: 0.9rem; }
}

@media (max-width: 768px) {
  .header-container { height: 68px; }
  .hero-section { min-height: calc(100vh - 68px); }
  .mobile-toggle { display: block; }

  .nav-menu {
    position: fixed;
    top: 68px;
    left: 0;
    width: 100%;
    background-color: var(--clr-bg-dark);
    flex-direction: column;
    padding: 1.75rem;
    gap: 1.25rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    transform: translateY(-150%);
    transition: transform var(--transition-normal);
    z-index: 999;
  }

  .nav-menu.open {
    transform: translateY(0);
  }

  .hero-title { font-size: 2.2rem; }
  .hero-description { font-size: 1rem; }
  .section-padding { padding: 3rem 0; }
  .form-card { padding: 1.5rem 1.25rem; }
  .company-img { height: 190px; }
}