/* ========================================
   AITSPIN — Custom Styles
   ======================================== */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Playfair+Display:wght@600;700;800&display=swap');

/* ---------- CSS Variables ---------- */
:root {
  --primary: #0f2b5b;
  --primary-light: #1a3f7a;
  --primary-dark: #091d3e;
  --accent: #e8a838;
  --accent-light: #f0be5e;
  --accent-dark: #c8901e;
  --dark: #0a0e17;
  --dark-surface: #111827;
  --dark-card: #1a2234;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --white: #ffffff;
  --font-sans: 'Inter', sans-serif;
  --font-display: 'Playfair Display', serif;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.08);
  --shadow-md: 0 4px 20px rgba(0,0,0,.1);
  --shadow-lg: 0 10px 40px rgba(0,0,0,.12);
  --shadow-glow: 0 0 40px rgba(232,168,56,.15);
  --transition: .3s cubic-bezier(.4,0,.2,1);
}

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

body {
  font-family: var(--font-sans);
  color: var(--gray-700);
  background: var(--white);
  line-height: 1.7;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 700;
  color: var(--primary);
  line-height: 1.25;
}

.display-heading {
  font-family: var(--font-display);
  font-weight: 800;
}

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

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

/* ---------- Utility ---------- */
.section-padding { padding: 100px 0; }
.section-padding-sm { padding: 60px 0; }

.text-accent { color: var(--accent) !important; }
.text-primary { color: var(--primary) !important; }
.text-gray { color: var(--gray-500) !important; }

.bg-primary { background-color: var(--primary) !important; }
.bg-dark { background-color: var(--dark) !important; }
.bg-dark-surface { background-color: var(--dark-surface) !important; }
.bg-light { background-color: var(--gray-100) !important; }
.bg-accent { background-color: var(--accent) !important; }

.section-label {
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.6rem;
  font-weight: 800;
  margin-bottom: 20px;
}

.section-subtitle {
  font-size: 1.15rem;
  color: var(--gray-500);
  max-width: 640px;
  line-height: 1.8;
}

.divider-accent {
  width: 60px;
  height: 4px;
  background: var(--accent);
  border: none;
  border-radius: 2px;
  margin: 20px 0;
}

/* ---------- Buttons ---------- */
.btn-primary-custom {
  background: var(--primary);
  color: var(--white);
  border: none;
  padding: 14px 36px;
  border-radius: 50px;
  font-weight: 600;
  font-size: .95rem;
  letter-spacing: .3px;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-primary-custom:hover {
  background: var(--primary-light);
  color: var(--white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-accent-custom {
  background: var(--accent);
  color: var(--dark);
  border: none;
  padding: 14px 36px;
  border-radius: 50px;
  font-weight: 600;
  font-size: .95rem;
  letter-spacing: .3px;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-accent-custom:hover {
  background: var(--accent-light);
  color: var(--dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.btn-outline-custom {
  background: transparent;
  color: var(--white);
  border: 2px solid rgba(255,255,255,.3);
  padding: 12px 32px;
  border-radius: 50px;
  font-weight: 600;
  font-size: .95rem;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-outline-custom:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

.btn-outline-dark {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
  padding: 12px 32px;
  border-radius: 50px;
  font-weight: 600;
  font-size: .95rem;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-outline-dark:hover {
  background: var(--primary);
  color: var(--white);
  transform: translateY(-2px);
}

/* ---------- Navbar ---------- */
.navbar-aitspin {
  background: rgba(10, 14, 23, .95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 12px 0;
  transition: var(--transition);
  border-bottom: 1px solid rgba(255,255,255,.06);
}
.navbar-aitspin.scrolled {
  padding: 8px 0;
  box-shadow: 0 4px 30px rgba(0,0,0,.3);
}
.navbar-aitspin .navbar-brand {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--white);
  letter-spacing: -0.5px;
}
.navbar-aitspin .navbar-brand span {
  color: var(--accent);
}
.navbar-aitspin .nav-link {
  color: rgba(255,255,255,.75);
  font-weight: 500;
  font-size: .9rem;
  padding: 8px 16px !important;
  transition: var(--transition);
  position: relative;
}
.navbar-aitspin .nav-link:hover,
.navbar-aitspin .nav-link.active {
  color: var(--white);
}
.navbar-aitspin .nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 16px;
  right: 16px;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transition: var(--transition);
}
.navbar-aitspin .nav-link:hover::after,
.navbar-aitspin .nav-link.active::after {
  transform: scaleX(1);
}
.navbar-aitspin .dropdown-menu {
  background: var(--dark-surface);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: var(--radius);
  padding: 8px;
  min-width: 240px;
  box-shadow: 0 10px 40px rgba(0,0,0,.4);
}
.navbar-aitspin .dropdown-item {
  color: rgba(255,255,255,.7);
  padding: 10px 16px;
  border-radius: 8px;
  font-size: .88rem;
  transition: var(--transition);
}
.navbar-aitspin .dropdown-item:hover {
  background: rgba(232,168,56,.1);
  color: var(--accent);
}
.navbar-toggler {
  border: none;
  padding: 4px 8px;
}
.navbar-toggler:focus { box-shadow: none; }
.navbar-toggler-icon {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255,255,255,.8)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e") !important;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--dark) 0%, var(--primary-dark) 50%, var(--primary) 100%);
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 800px;
  height: 800px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(232,168,56,.08) 0%, transparent 70%);
  pointer-events: none;
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(26,63,122,.3) 0%, transparent 70%);
  pointer-events: none;
}
.hero-badge {
  display: inline-block;
  padding: 6px 20px;
  border: 1px solid rgba(232,168,56,.3);
  border-radius: 50px;
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 24px;
}
.hero h1 {
  font-size: 4rem;
  font-weight: 900;
  color: var(--white);
  line-height: 1.1;
  margin-bottom: 24px;
}
.hero h1 .highlight {
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero .lead {
  font-size: 1.2rem;
  color: rgba(255,255,255,.65);
  max-width: 540px;
  line-height: 1.8;
  margin-bottom: 40px;
}
.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 60px;
  padding-top: 40px;
  border-top: 1px solid rgba(255,255,255,.1);
}
.hero-stats .stat h3 {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 4px;
}
.hero-stats .stat p {
  font-size: .85rem;
  color: rgba(255,255,255,.5);
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 1px;
}

@media (max-width: 768px) {
  .hero h1 { font-size: 2.5rem; }
  .hero-stats { gap: 24px; flex-wrap: wrap; }
  .hero-stats .stat h3 { font-size: 1.6rem; }
}

/* ---------- Cards ---------- */
.card-custom {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 36px;
  transition: var(--transition);
  height: 100%;
}
.card-custom:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.card-custom .card-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(232,168,56,.1), rgba(232,168,56,.05));
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--accent);
  font-size: 1.4rem;
}
.card-custom h4 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 12px;
}
.card-custom p {
  color: var(--gray-500);
  font-size: .95rem;
  margin-bottom: 0;
}

/* Dark card variant */
.card-dark {
  background: var(--dark-card);
  border: 1px solid rgba(255,255,255,.06);
  border-radius: var(--radius-lg);
  padding: 36px;
  transition: var(--transition);
  height: 100%;
}
.card-dark:hover {
  border-color: rgba(232,168,56,.3);
  transform: translateY(-4px);
  box-shadow: 0 10px 40px rgba(0,0,0,.3);
}
.card-dark h4 { color: var(--white); }
.card-dark p { color: rgba(255,255,255,.5); }
.card-dark .card-icon {
  background: rgba(232,168,56,.1);
}

/* ---------- Pentagon Graphic ---------- */
.pentagon-item {
  text-align: center;
  padding: 20px;
}
.pentagon-item .icon-circle {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  color: var(--accent);
  font-size: 1.6rem;
  box-shadow: 0 4px 20px rgba(15,43,91,.3);
}
.pentagon-item h5 {
  font-size: .95rem;
  font-weight: 700;
  color: var(--primary);
}

/* ---------- Comparison Block ---------- */
.comparison-card {
  border-radius: var(--radius-lg);
  padding: 40px;
  height: 100%;
}
.comparison-card.traditional {
  background: var(--gray-100);
  border: 1px solid var(--gray-200);
}
.comparison-card.hyflex {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: var(--white);
  border: none;
}
.comparison-card .check-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 16px;
  font-size: .95rem;
}
.comparison-card .check-item i {
  margin-top: 3px;
  font-size: 1rem;
}
.comparison-card.traditional .check-item i { color: var(--gray-400); }
.comparison-card.hyflex .check-item i { color: var(--accent); }

/* ---------- CTA Section ---------- */
.cta-section {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  position: relative;
  overflow: hidden;
}
.cta-section::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(232,168,56,.1) 0%, transparent 70%);
}

/* ---------- Footer ---------- */
.footer {
  background: var(--dark);
  color: rgba(255,255,255,.5);
  padding: 80px 0 0;
}
.footer h5 {
  color: var(--white);
  font-size: .85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 24px;
}
.footer ul { list-style: none; padding: 0; margin: 0; }
.footer ul li { margin-bottom: 10px; }
.footer ul li a {
  color: rgba(255,255,255,.45);
  font-size: .9rem;
  transition: var(--transition);
}
.footer ul li a:hover {
  color: var(--accent);
  padding-left: 4px;
}
.footer-brand {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--white);
  margin-bottom: 16px;
}
.footer-brand span { color: var(--accent); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.06);
  padding: 24px 0;
  margin-top: 60px;
  font-size: .85rem;
}

/* ---------- Page Header ---------- */
.page-header {
  background: linear-gradient(135deg, var(--dark) 0%, var(--primary-dark) 100%);
  padding: 140px 0 80px;
  position: relative;
  overflow: hidden;
}
.page-header::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -15%;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(232,168,56,.06) 0%, transparent 70%);
}
.page-header h1 {
  font-size: 3.2rem;
  font-weight: 900;
  color: var(--white);
}
.page-header p {
  font-size: 1.15rem;
  color: rgba(255,255,255,.6);
  max-width: 600px;
}

/* ---------- Icon List ---------- */
.icon-list {
  list-style: none;
  padding: 0;
}
.icon-list li {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 18px;
  font-size: .95rem;
}
.icon-list li i {
  color: var(--accent);
  margin-top: 4px;
  font-size: 1rem;
}

/* ---------- Timeline ---------- */
.timeline-item {
  position: relative;
  padding-left: 40px;
  padding-bottom: 40px;
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: 14px;
  top: 36px;
  bottom: 0;
  width: 2px;
  background: var(--gray-200);
}
.timeline-item:last-child::before { display: none; }
.timeline-item .timeline-dot {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--accent);
  position: absolute;
  left: 0;
  top: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: .75rem;
  font-weight: 700;
}

/* ---------- Insights / Blog Cards ---------- */
.insight-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--white);
  border: 1px solid var(--gray-200);
  transition: var(--transition);
}
.insight-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.insight-card .insight-img {
  height: 200px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 2.5rem;
}
.insight-card .insight-body {
  padding: 28px;
}
.insight-card .insight-tag {
  font-size: .75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent);
  margin-bottom: 10px;
}
.insight-card h5 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--primary);
}
.insight-card p {
  font-size: .9rem;
  color: var(--gray-500);
}

/* ---------- Contact Form ---------- */
.form-control-custom {
  background: var(--gray-100);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 14px 18px;
  font-size: .95rem;
  transition: var(--transition);
}
.form-control-custom:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(232,168,56,.15);
  background: var(--white);
}

/* ---------- Team / Faculty Grid ---------- */
.team-card {
  text-align: center;
  padding: 30px 20px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-200);
  transition: var(--transition);
}
.team-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
}
.team-card .avatar {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  color: var(--accent);
  font-size: 2rem;
}
.team-card h5 {
  font-size: 1rem;
  margin-bottom: 4px;
}
.team-card p {
  font-size: .85rem;
  color: var(--gray-500);
  margin-bottom: 0;
}

/* ---------- Scroll Animations ---------- */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .6s ease, transform .6s ease;
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Back to Top ---------- */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--primary);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 999;
  border: none;
  cursor: pointer;
}
.back-to-top.show {
  opacity: 1;
  visibility: visible;
}
.back-to-top:hover {
  background: var(--accent);
  transform: translateY(-3px);
}