/* ==========================================
   CSS Variables & Reset
   ========================================== */
:root {
  /* Colors */
  --color-primary: #0f2744;
  --color-primary-light: #1a3a5c;
  --color-secondary: #4a6fa5;
  --color-accent: #e8743b;
  --color-gray-900: #1a1a2e;
  --color-gray-700: #4a4a5a;
  --color-gray-500: #6b7280;
  --color-gray-300: #d1d5db;
  --color-gray-100: #f3f4f6;
  --color-white: #ffffff;
  --color-bg: #fafbfc;

  /* Typography */
  --font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  /* Spacing */
  --section-padding: 100px 0;
  --container-width: 1200px;

  /* Transitions */
  --transition: all 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-gray-700);
  background-color: var(--color-bg);
  overflow-x: hidden;
}

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

ul {
  list-style: none;
}

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

/* ==========================================
   Layout
   ========================================== */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: var(--section-padding);
}

/* ==========================================
   Buttons
   ========================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  font-size: 15px;
  font-weight: 600;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  transition: var(--transition);
}

.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-white);
}

.btn-primary:hover {
  background-color: #d4682f;
  transform: translateY(-2px);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-white);
  border: 2px solid var(--color-white);
}

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

.btn-full {
  width: 100%;
}

/* ==========================================
   Header & Navigation
   ========================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: var(--transition);
}

.header.scrolled {
  background-color: var(--color-white);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
}

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

.nav-logo {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.logo-img {
  height: 48px;
  width: auto;
}

.header.scrolled .logo-img {
  filter: none;
}

.logo-text {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-white);
  transition: var(--transition);
}

.header.scrolled .logo-text {
  color: var(--color-primary);
}

.logo-sub {
  font-size: 11px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.7);
  text-transform: uppercase;
  letter-spacing: 1px;
  transition: var(--transition);
}

.header.scrolled .logo-sub {
  color: var(--color-gray-500);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.9);
  border-radius: 6px;
  transition: var(--transition);
}

.header.scrolled .nav-link {
  color: var(--color-gray-700);
}

.nav-link:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.header.scrolled .nav-link:hover {
  background-color: var(--color-gray-100);
  color: var(--color-primary);
}

.nav-link-cta {
  background-color: var(--color-accent);
  color: var(--color-white) !important;
}

.nav-link-cta:hover {
  background-color: #d4682f !important;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background-color: var(--color-white);
  transition: var(--transition);
}

.header.scrolled .nav-toggle span {
  background-color: var(--color-primary);
}

/* ==========================================
   Hero Section
   ========================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  opacity: 0.3;
}

.hero-bg::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  opacity: 0.85;
}

.hero-content {
  position: relative;
  text-align: center;
  max-width: 800px;
  padding: 120px 24px 80px;
}

.hero-title {
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 700;
  color: var(--color-white);
  line-height: 1.2;
  margin-bottom: 24px;
  text-wrap: balance;
}

.hero-subtitle {
  font-size: clamp(16px, 2vw, 20px);
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 40px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
}

.scroll-indicator {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: rgba(255, 255, 255, 0.6);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 2px;
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(8px);
  }
}

/* ==========================================
   Section Headers
   ========================================== */
.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 60px;
}

.section-tag {
  display: inline-block;
  padding: 6px 16px;
  background-color: rgba(74, 111, 165, 0.1);
  color: var(--color-secondary);
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  border-radius: 20px;
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
  line-height: 1.2;
}

.section-subtitle {
  font-size: 17px;
  color: var(--color-gray-500);
  line-height: 1.7;
}

/* ==========================================
   About Section
   ========================================== */
.about {
  background-color: var(--color-white);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-text {
  font-size: 16px;
  color: var(--color-gray-700);
  margin-bottom: 20px;
  line-height: 1.8;
}

.about-stats {
  display: flex;
  gap: 40px;
  margin-top: 40px;
  padding-top: 40px;
  border-top: 1px solid var(--color-gray-300);
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-number {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-primary);
}

.stat-label {
  font-size: 14px;
  color: var(--color-gray-500);
}

.about-image {
  display: flex;
  justify-content: center;
}

.about-img {
  width: 100%;
  max-width: 500px;
  height: auto;
  border-radius: 16px;
  object-fit: cover;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
}

.image-placeholder {
  width: 100%;
  max-width: 400px;
  aspect-ratio: 4 / 3;
  background: linear-gradient(135deg, var(--color-gray-100) 0%, var(--color-gray-300) 100%);
  border-radius: 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  color: var(--color-gray-500);
}

.image-placeholder svg {
  opacity: 0.5;
}

.image-placeholder span {
  font-size: 14px;
  font-weight: 500;
}

/* ==========================================
   Capabilities Section
   ========================================== */
.capabilities {
  background-color: var(--color-bg);
}

.capabilities-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.capability-card {
  background-color: var(--color-white);
  padding: 32px;
  border-radius: 16px;
  border: 1px solid var(--color-gray-100);
  transition: var(--transition);
}

.capability-img-wrapper {
  width: 100%;
  height: 180px;
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 20px;
}

.capability-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.capability-card:hover .capability-img {
  transform: scale(1.05);
}

.capability-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
}

.capability-icon {
  width: 56px;
  height: 56px;
  background-color: rgba(74, 111, 165, 0.1);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-secondary);
  margin-bottom: 20px;
}

.capability-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.capability-desc {
  font-size: 15px;
  color: var(--color-gray-500);
  line-height: 1.7;
}

/* ==========================================
   Why Choose Us Section
   ========================================== */
.why-us {
  background-color: var(--color-white);
}

.why-us-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 60px;
  align-items: center;
}

.why-us-content .section-tag {
  margin-bottom: 12px;
}

.why-us-content .section-title {
  text-align: left;
  margin-bottom: 16px;
}

.why-us-intro {
  font-size: 17px;
  color: var(--color-gray-500);
  margin-bottom: 32px;
  line-height: 1.7;
}

.why-us-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.why-us-item {
  display: flex;
  gap: 16px;
}

.check-icon {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  background-color: rgba(74, 111, 165, 0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-secondary);
}

.why-us-item strong {
  display: block;
  font-size: 16px;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.why-us-item p {
  font-size: 14px;
  color: var(--color-gray-500);
  line-height: 1.6;
}

.why-us-visual {
  display: flex;
  justify-content: center;
}

.why-us-img {
  width: 100%;
  max-width: 450px;
  height: auto;
  border-radius: 20px;
  object-fit: cover;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.12);
}

.visual-card {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  padding: 48px;
  border-radius: 20px;
  text-align: center;
  color: var(--color-white);
}

.visual-icon {
  margin-bottom: 24px;
  opacity: 0.9;
}

.visual-card h4 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
}

.visual-card p {
  font-size: 15px;
  opacity: 0.8;
  line-height: 1.6;
}

/* ==========================================
   Operations Section
   ========================================== */
.operations {
  background-color: var(--color-bg);
}

.operations-gallery {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(2, 200px);
  gap: 16px;
  margin-bottom: 60px;
}

.gallery-item {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  cursor: pointer;
}

.gallery-item.gallery-large {
  grid-column: span 2;
  grid-row: span 2;
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.gallery-item:hover img {
  transform: scale(1.05);
}

.gallery-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 20px;
  background: linear-gradient(to top, rgba(15, 39, 68, 0.9), transparent);
  opacity: 0;
  transition: var(--transition);
}

.gallery-item:hover .gallery-overlay {
  opacity: 1;
}

.gallery-overlay span {
  color: var(--color-white);
  font-size: 14px;
  font-weight: 600;
}

.operation-item {
  background-color: var(--color-white);
  padding: 32px;
  border-radius: 16px;
  border-left: 4px solid var(--color-secondary);
  transition: var(--transition);
}

.operation-item:hover {
  transform: translateX(4px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
}

.operation-number {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-secondary);
  margin-bottom: 12px;
}

.operation-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.operation-desc {
  font-size: 15px;
  color: var(--color-gray-500);
  line-height: 1.7;
}

/* ==========================================
   Contact Section
   ========================================== */
.contact {
  background-color: var(--color-white);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}

.contact-info .section-tag {
  margin-bottom: 12px;
}

.contact-info .section-title {
  text-align: left;
  margin-bottom: 16px;
}

.contact-intro {
  font-size: 17px;
  color: var(--color-gray-500);
  margin-bottom: 32px;
  line-height: 1.7;
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 16px;
}

.contact-icon {
  width: 48px;
  height: 48px;
  background-color: var(--color-gray-100);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-secondary);
  flex-shrink: 0;
}

.contact-item strong {
  color: var(--color-primary);
  font-size: 16px;
}

.contact-item span {
  color: var(--color-gray-700);
  font-size: 15px;
}

.contact-item a {
  color: var(--color-secondary);
  font-size: 15px;
}

.contact-item a:hover {
  color: var(--color-primary);
}

.contact-form-wrapper {
  background-color: var(--color-gray-100);
  padding: 40px;
  border-radius: 20px;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
}

.form-group input,
.form-group textarea {
  padding: 14px 18px;
  font-size: 15px;
  font-family: var(--font-family);
  border: 1px solid var(--color-gray-300);
  border-radius: 10px;
  background-color: var(--color-white);
  transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-secondary);
  box-shadow: 0 0 0 3px rgba(74, 111, 165, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

/* ==========================================
   Footer
   ========================================== */
.footer {
  background-color: var(--color-primary);
  padding: 40px 0;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-logo {
  height: 40px;
  width: auto;
}

.footer-brand p {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
}

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

.footer-bottom {
  padding-top: 24px;
  text-align: center;
}

.footer-bottom p {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.5);
}

/* ==========================================
   Animations
   ========================================== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ==========================================
   Responsive Design
   ========================================== */
@media (max-width: 992px) {
  .about-grid,
  .why-us-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-image {
    order: -1;
  }

  .why-us-visual {
    order: -1;
  }

  .visual-card {
    max-width: 400px;
  }

  .operations-gallery {
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: repeat(3, 180px);
  }

  .gallery-item.gallery-large {
    grid-column: span 2;
    grid-row: span 1;
  }

  .footer-content {
    flex-direction: column;
    gap: 24px;
    text-align: center;
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }
}

@media (max-width: 768px) {
  :root {
    --section-padding: 70px 0;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background-color: var(--color-primary);
    flex-direction: column;
    align-items: flex-start;
    padding: 100px 32px 40px;
    gap: 8px;
    transition: right 0.3s ease;
  }

  .nav-menu.active {
    right: 0;
  }

  .nav-link {
    width: 100%;
    color: var(--color-white);
  }

  .nav-toggle {
    display: flex;
    z-index: 1001;
  }

  .nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .hero-buttons .btn {
    width: 100%;
    max-width: 280px;
  }

  .about-stats {
    flex-direction: column;
    gap: 24px;
  }

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

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

  .contact-form-wrapper {
    padding: 24px;
  }

  .hero-scroll {
    display: none;
  }

  .operations-gallery {
    grid-template-columns: 1fr;
    grid-template-rows: auto;
  }

  .gallery-item,
  .gallery-item.gallery-large {
    grid-column: span 1;
    grid-row: span 1;
    height: 200px;
  }

  .gallery-overlay {
    opacity: 1;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .section-header {
    margin-bottom: 40px;
  }

  .capability-card,
  .operation-item {
    padding: 24px;
  }
}