/* ============================================
   MIT SOUTH v2 — Dark Premium Design System
   ============================================ */

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

:root {
  --bg: #0a0a0a;
  --bg-elevated: #111111;
  --bg-card: #141414;
  --bg-card-hover: #1a1a1a;
  --border: rgba(255,255,255,0.06);
  --border-hover: rgba(255,255,255,0.12);
  --text: #ffffff;
  --text-secondary: rgba(255,255,255,0.55);
  --text-muted: rgba(255,255,255,0.3);
  --accent: #ffffff;
  --accent-subtle: rgba(255,255,255,0.08);
  --glow: rgba(255,255,255,0.03);
  --radius: 16px;
  --radius-sm: 10px;
  --transition: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  --max-width: 1140px;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
ul { list-style: none; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 28px; }

/* --- Typography --- */
h1, h2, h3, h4 { line-height: 1.15; font-weight: 500; color: var(--text); letter-spacing: -0.03em; }
h1 { font-size: clamp(2.8rem, 6vw, 4.2rem); font-weight: 300; }
h2 { font-size: clamp(2rem, 4vw, 2.8rem); font-weight: 300; }
h3 { font-size: 1.15rem; font-weight: 500; letter-spacing: -0.01em; }
p { color: var(--text-secondary); }

.label {
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 20px;
  display: block;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 15px 36px;
  border-radius: 50px;
  font-size: 0.82rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
}
.btn-primary {
  background: var(--text);
  color: var(--bg);
}
.btn-primary:hover {
  box-shadow: 0 0 40px rgba(255,255,255,0.15);
  transform: translateY(-2px);
}
.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-ghost:hover {
  border-color: var(--border-hover);
  background: var(--accent-subtle);
}
.btn-sm { padding: 10px 24px; font-size: 0.75rem; }

/* --- Navigation --- */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(10,10,10,0.8);
  backdrop-filter: blur(30px) saturate(1.5);
  -webkit-backdrop-filter: blur(30px) saturate(1.5);
  border-bottom: 1px solid var(--border);
}
.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}
.logo {
  font-weight: 100;
  font-size: 1.2rem;
  letter-spacing: 12px;
  text-transform: uppercase;
  color: var(--text);
  transition: opacity var(--transition);
}
.logo:hover { opacity: 0.7; }
.nav-links { display: flex; align-items: center; gap: 32px; }
.nav-links a {
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--text-muted);
  transition: color var(--transition);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.nav-links a:hover, .nav-links a.active { color: var(--text); }
.nav-links .btn { text-transform: uppercase; }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 20px; height: 1.5px; background: var(--text); margin: 5px 0; transition: all var(--transition); }

/* --- Hero --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -50%; left: -50%;
  width: 200%; height: 200%;
  background: radial-gradient(ellipse at center, rgba(255,255,255,0.015) 0%, transparent 60%);
  animation: heroGlow 8s ease-in-out infinite alternate;
}
@keyframes heroGlow {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(2%, -2%) scale(1.05); }
}
.hero-content { position: relative; z-index: 1; max-width: 700px; }
.hero h1 {
  margin-bottom: 28px;
  font-weight: 200;
}
.hero h1 em {
  font-style: normal;
  color: var(--text-muted);
  font-weight: 100;
}
.hero p {
  font-size: 1rem;
  max-width: 480px;
  margin: 0 auto 48px;
  line-height: 1.8;
  color: var(--text-muted);
}
.hero-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.hero-line {
  position: absolute;
  bottom: 60px;
  left: 50%;
  transform: translateX(-50%);
  width: 1px;
  height: 60px;
  background: linear-gradient(to bottom, var(--border), transparent);
  animation: lineDown 2s ease-in-out infinite;
}
@keyframes lineDown {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}

/* --- Page Hero (inner pages) --- */
.page-hero {
  padding: 160px 0 80px;
  text-align: center;
  position: relative;
}
.page-hero::after {
  content: '';
  position: absolute;
  bottom: 0; left: 10%; right: 10%;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--border), transparent);
}
.page-hero h1 { margin-bottom: 20px; }
.page-hero p { max-width: 520px; margin: 0 auto; font-size: 1rem; color: var(--text-muted); }

/* --- Sections --- */
.section { padding: 120px 0; position: relative; }
.section-divider::before {
  content: '';
  position: absolute;
  top: 0; left: 10%; right: 10%;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--border), transparent);
}

/* --- Service Cards (Home) --- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-top: 60px;
}
.service-card {
  background: var(--bg-card);
  padding: 52px 44px;
  transition: all var(--transition);
  position: relative;
}
.service-card:hover { background: var(--bg-card-hover); }
.service-card .num {
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 3px;
  color: var(--text-muted);
  margin-bottom: 28px;
  display: block;
}
.service-card h3 { margin-bottom: 14px; font-size: 1.3rem; font-weight: 400; }
.service-card p { font-size: 0.9rem; margin-bottom: 28px; line-height: 1.7; }
.service-card .link {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all var(--transition);
}
.service-card:hover .link { color: var(--text); gap: 14px; }

/* --- Split Content --- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.split-reverse { direction: rtl; }
.split-reverse > * { direction: ltr; }
.split-text h2 { margin-bottom: 20px; }
.split-text p { margin-bottom: 20px; font-size: 0.95rem; }
.split-text ul { margin-bottom: 28px; }
.split-text ul li {
  padding: 10px 0;
  padding-left: 20px;
  position: relative;
  font-size: 0.9rem;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
}
.split-text ul li:last-child { border-bottom: none; }
.split-text ul li::before {
  content: '';
  position: absolute;
  left: 0; top: 18px;
  width: 6px; height: 1px;
  background: var(--text-muted);
}
.split-visual {
  aspect-ratio: 1;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-muted);
  position: relative;
  overflow: hidden;
}
.split-visual::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 40%, rgba(255,255,255,0.02), transparent 60%);
}

/* --- Features (service pages) --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1px;
  background: var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-top: 60px;
}
.feature-item {
  background: var(--bg-card);
  padding: 44px 36px;
  transition: background var(--transition);
}
.feature-item:hover { background: var(--bg-card-hover); }
.feature-item .num {
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 3px;
  color: var(--text-muted);
  margin-bottom: 20px;
  display: block;
}
.feature-item h3 { margin-bottom: 12px; font-weight: 400; }
.feature-item p { font-size: 0.88rem; line-height: 1.7; }

/* --- Stats --- */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.stat {
  background: var(--bg-card);
  padding: 48px 32px;
  text-align: center;
}
.stat-num {
  font-size: 2.5rem;
  font-weight: 200;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 8px;
}
.stat-label {
  font-size: 0.7rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-muted);
}

/* --- CTA --- */
.cta {
  text-align: center;
  padding: 140px 0;
  position: relative;
}
.cta::before {
  content: '';
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(255,255,255,0.02), transparent 70%);
  border-radius: 50%;
}
.cta h2 { margin-bottom: 16px; position: relative; }
.cta p { max-width: 420px; margin: 0 auto 40px; color: var(--text-muted); position: relative; }
.cta .hero-buttons { position: relative; }

/* --- Contact --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 60px;
  margin-top: 60px;
}
.contact-info h3 { font-weight: 400; font-size: 1.3rem; margin-bottom: 32px; }
.contact-detail {
  display: flex;
  gap: 16px;
  margin-bottom: 32px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border);
}
.contact-detail:last-child { border-bottom: none; }
.contact-detail .icon {
  width: 40px; height: 40px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  font-size: 0.9rem;
}
.contact-detail .text strong {
  display: block;
  color: var(--text);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 4px;
}
.contact-detail .text p { font-size: 0.9rem; }

.contact-form {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 44px;
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 16px; }
.form-group { margin-bottom: 16px; }
.form-group label {
  display: block;
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 8px;
  color: var(--text-muted);
}
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 14px 18px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-family: inherit;
  color: var(--text);
  transition: border-color var(--transition);
}
.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--text-muted); }
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--border-hover);
}
.form-group textarea { resize: vertical; min-height: 130px; }
.form-group select { appearance: none; }
.form-group select option { background: var(--bg-card); color: var(--text); }

/* --- Testimonial --- */
.testimonial {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}
.testimonial blockquote {
  font-size: 1.15rem;
  font-weight: 300;
  font-style: italic;
  color: var(--text-secondary);
  line-height: 1.9;
  margin-bottom: 24px;
}
.testimonial cite {
  font-style: normal;
  font-size: 0.75rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-muted);
}

/* --- FAQ --- */
.faq-list { max-width: 680px; margin: 60px auto 0; }
.faq-item {
  padding: 28px 0;
  border-bottom: 1px solid var(--border);
}
.faq-item h3 { font-weight: 400; font-size: 1.05rem; margin-bottom: 10px; }
.faq-item p { font-size: 0.9rem; }

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--border);
  padding: 60px 0 28px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 60px;
}
.footer-brand .logo { margin-bottom: 16px; display: inline-block; }
.footer-brand p { font-size: 0.85rem; max-width: 260px; color: var(--text-muted); }
.footer h4 {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 24px;
}
.footer ul li { margin-bottom: 14px; }
.footer ul li a { font-size: 0.85rem; color: var(--text-secondary); transition: color var(--transition); }
.footer ul li a:hover { color: var(--text); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* --- Animations --- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}
.reveal.visible { opacity: 1; transform: none; }
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }

/* --- Mobile --- */
@media (max-width: 900px) {
  .services-grid { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-toggle { display: block; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 70px; left: 0; right: 0;
    background: rgba(10,10,10,0.95);
    backdrop-filter: blur(30px);
    padding: 28px;
    gap: 18px;
    border-bottom: 1px solid var(--border);
  }
  .split { grid-template-columns: 1fr; gap: 40px; }
  .split-reverse { direction: ltr; }
  .split-visual { order: -1; aspect-ratio: 16/10; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .hero { min-height: 90vh; padding: 0 20px; }
  .hero h1 { font-size: 2.4rem; }
  h2 { font-size: 1.8rem; }
}