/* ========================================
   ITGEN - Global Engineering Network
   Modern Redesign
   ======================================== */

@import url('https://fonts.googleapis.com/css2?family=Jost:wght@300;400;500;600;700;800;900&family=Nunito+Sans:wght@300;400;600;700;800;900&display=swap');

/* --- Design Tokens --- */
:root {
  --color-primary: #007dc3;
  --color-primary-glow: rgba(0, 125, 195, 0.4);
  --color-primary-dark: #005f94;
  --color-bg-dark: #0a0a1a;
  --color-bg-section: #0d1020;
  --color-bg-card: rgba(255, 255, 255, 0.04);
  --color-border: rgba(255, 255, 255, 0.08);
  --color-text: #f0f0f5;
  --color-text-muted: #9a9ab0;
  --color-success: #2ecc71;
  --color-error: #e74c3c;
  --font-heading: 'Jost', sans-serif;
  --font-body: 'Nunito Sans', sans-serif;
  --max-width: 1200px;
  --nav-height: 72px;
  --radius: 14px;
  --radius-sm: 8px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --space-section: clamp(5rem, 12vw, 9rem);
  --space-element: clamp(1.5rem, 4vw, 3rem);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: var(--font-body);
  background: var(--color-bg-dark);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  color: var(--color-text);
}

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

ul {
  list-style: none;
}

/* --- Animations --- */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s var(--transition), transform 0.7s var(--transition);
}

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

.fade-up.delay-1 { transition-delay: 0.1s; }
.fade-up.delay-2 { transition-delay: 0.2s; }
.fade-up.delay-3 { transition-delay: 0.3s; }
.fade-up.delay-4 { transition-delay: 0.4s; }

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

@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* --- Navbar --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  background: rgba(10, 10, 26, 0.7);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition);
}

.navbar .nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
  height: 100%;
}

.nav-logo {
  height: 38px;
  width: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-links a {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: color var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition);
}

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

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

.nav-links .btn-contact {
  color: #fff;
  background: var(--color-primary);
  padding: 0.5rem 1.25rem;
  border-radius: 50px;
  font-weight: 700;
}

.nav-links .btn-contact::after {
  display: none;
}

.nav-links .btn-contact:hover {
  background: var(--color-primary-dark);
  color: #fff;
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 8px;
  z-index: 110;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition);
}

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

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

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

/* --- Hero Section --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
}

.hero-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: -2;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 10, 26, 0.65) 0%, rgba(10, 10, 26, 0.85) 100%);
  z-index: -1;
}

.hero-content {
  max-width: 800px;
  padding: 2rem;
  animation: fade-in 1.2s ease-out;
}

.hero-content h1 {
  font-family: var(--font-heading);
  font-size: clamp(2.4rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.hero-content h1 .accent {
  color: var(--color-primary);
}

.hero-subtitle {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--color-text-muted);
  max-width: 550px;
  margin: 0 auto 1.5rem;
  font-weight: 400;
  line-height: 1.7;
}

.hero-tagline {
  font-size: clamp(1.1rem, 2.5vw, 1.35rem);
  font-weight: 700;
  margin-bottom: 2.5rem;
  color: var(--color-text);
}

.btn-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--color-primary);
  color: #fff;
  padding: 0.85rem 2rem;
  border-radius: 50px;
  font-weight: 700;
  font-size: 1rem;
  transition: all var(--transition);
  box-shadow: 0 4px 20px var(--color-primary-glow);
}

.btn-cta:hover {
  background: var(--color-primary-dark);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 30px var(--color-primary-glow);
}

.btn-cta .arrow {
  width: 18px;
  height: 18px;
  animation: bounce-arrow 2s ease-in-out infinite;
  filter: brightness(0) invert(1);
}

/* --- Timeline Section --- */
.timeline {
  background: var(--color-bg-dark);
  padding: var(--space-section) 2rem;
  position: relative;
}

.timeline-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  max-width: 900px;
  margin: 0 auto;
  position: relative;
}

/* Connecting line */
.timeline-grid::before {
  content: '';
  position: absolute;
  top: 28px;
  left: 15%;
  right: 15%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-primary), transparent);
  opacity: 0.3;
}

.timeline-item {
  text-align: center;
  position: relative;
}

.timeline-year {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 300;
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

.timeline-year strong {
  color: var(--color-primary);
  font-weight: 700;
}

.timeline-item img {
  max-height: 50px;
  margin: 0 auto;
  opacity: 0.85;
  transition: opacity var(--transition);
}

.timeline-item:hover img {
  opacity: 1;
}

/* --- Branch Sections --- */
.branches {
  background: linear-gradient(180deg, var(--color-bg-dark) 0%, var(--color-bg-section) 50%, var(--color-bg-dark) 100%);
  padding: var(--space-section) 2rem;
}

.branch-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: clamp(2rem, 5vw, 3.5rem);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  scroll-margin-top: calc(var(--nav-height) + 2rem);
}

.branch-card + .branch-card {
  margin-top: clamp(3rem, 6vw, 5rem);
}

.branch-card:nth-child(even) .branch-img {
  order: -1;
}

.branch-text h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 800;
  margin-bottom: 0.5rem;
  line-height: 1.15;
}

.branch-text .accent-line {
  width: 50px;
  height: 3px;
  background: var(--color-primary);
  border-radius: 3px;
  margin-bottom: 1.25rem;
}

.branch-text p {
  color: var(--color-text-muted);
  font-size: clamp(0.95rem, 1.8vw, 1.05rem);
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.branch-text p a {
  font-weight: 700;
  font-style: italic;
}

.btn-visit {
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  padding: 0.7rem 1.8rem;
  border-radius: 50px;
  font-weight: 700;
  font-size: 0.95rem;
  transition: all var(--transition);
  box-shadow: 0 2px 12px var(--color-primary-glow);
}

.btn-visit:hover {
  background: var(--color-primary-dark);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 4px 20px var(--color-primary-glow);
}

.branch-img img {
  border-radius: var(--radius);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.4);
  transition: transform var(--transition);
}

.branch-img img:hover {
  transform: scale(1.02);
}

/* --- Contact Section --- */
.contact {
  padding: var(--space-section) 2rem;
  background: var(--color-bg-dark);
  scroll-margin-top: var(--nav-height);
}

.contact-inner {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}

.contact-inner h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.contact-inner .accent-line {
  width: 50px;
  height: 3px;
  background: var(--color-primary);
  border-radius: 3px;
  margin: 0 auto 0.75rem;
}

.contact-inner .contact-subtitle {
  color: var(--color-text-muted);
  margin-bottom: 2.5rem;
  font-size: 1.05rem;
}

.contact-form {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: clamp(1.5rem, 4vw, 2.5rem);
  text-align: left;
}

.contact-form input[type="text"],
.contact-form input[type="email"],
.contact-form textarea {
  width: 100%;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 0.95rem;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
  margin-bottom: 1rem;
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 125, 195, 0.15);
}

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

.contact-form ::placeholder {
  color: var(--color-text-muted);
  opacity: 0.7;
}

.cf-turnstile {
  margin-bottom: 1rem;
}

.btn-submit {
  width: 100%;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: 50px;
  padding: 0.9rem;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: 0 2px 12px var(--color-primary-glow);
}

.btn-submit:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px var(--color-primary-glow);
}

.btn-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.form-message {
  padding: 0.85rem 1rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
  font-weight: 600;
  font-size: 0.9rem;
  text-align: center;
  animation: fade-in 0.3s ease-out;
}

.form-message.success {
  background: rgba(46, 204, 113, 0.15);
  border: 1px solid rgba(46, 204, 113, 0.3);
  color: var(--color-success);
}

.form-message.error {
  background: rgba(231, 76, 60, 0.15);
  border: 1px solid rgba(231, 76, 60, 0.3);
  color: var(--color-error);
}

/* --- Footer --- */
.footer {
  background: var(--color-bg-section);
  border-top: 1px solid var(--color-border);
  padding: 3rem 2rem;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer-left li {
  color: var(--color-text-muted);
  font-size: 0.85rem;
  line-height: 1.8;
}

.footer-left li:first-child {
  color: var(--color-text);
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 0.25rem;
}

.footer-right {
  text-align: right;
}

.footer-right li {
  font-size: 0.85rem;
  line-height: 1.8;
}

.footer-right li a {
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.footer-right li a:hover {
  color: var(--color-primary);
}

.footer-right .copyright {
  color: rgba(255, 255, 255, 0.3);
  font-size: 0.8rem;
  margin-top: 0.5rem;
}

/* --- Responsive: Mobile --- */
@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: rgba(10, 10, 26, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: center;
    gap: 2rem;
    padding: 2rem;
    transition: right var(--transition);
    border-left: 1px solid var(--color-border);
  }

  .nav-links.open {
    right: 0;
  }

  .nav-links a {
    font-size: 1.1rem;
  }

  .nav-links a::after {
    display: none;
  }

  .branch-card {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .branch-card:nth-child(even) .branch-img {
    order: 0;
  }

  .branch-text .accent-line {
    margin-left: auto;
    margin-right: auto;
  }

  .branch-img img {
    max-width: 80%;
    margin: 0 auto;
  }

  .timeline-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .timeline-grid::before {
    display: none;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .footer-right {
    text-align: center;
  }

}

@media (max-width: 480px) {
  .hero-content h1 {
    font-size: 2rem;
  }

  .branch-card {
    padding: 1.5rem;
  }
}