:root {
  --primary: #2563eb;
  --primary-light: #60a5fa;
  --dark: #020617;
  --dark-soft: #0f172a;
  --light: #f8fafc;
  --gray: #94a3b8;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Inter', sans-serif;
}

body {
  background: var(--light);
  color: var(--dark-soft);
  line-height: 1.6;
}

/* =====================
   UTILITIES
===================== */
.container {
  width: 90%;
  max-width: 1200px;
  margin: auto;
}

.section {
  padding: 110px 0;
}

.section.alt {
  background: #eef2ff;
}

.section-title {
  text-align: center;
  font-size: 2.6rem;
  font-weight: 800;
  margin-bottom: 60px;
}

/* =====================
   PREMIUM NAVBAR
===================== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 999;
  background: linear-gradient(
    180deg,
    rgba(2, 6, 23, 0.95),
    rgba(2, 6, 23, 0.85)
  );
  backdrop-filter: blur(14px);
  box-shadow: 0 10px 30px rgba(0,0,0,.35);
}

.nav-flex {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
}

.brand {
  color: #ffffff;
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: .5px;
}

nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

nav a {
  color: #e5e7eb;
  text-decoration: none;
  font-weight: 500;
  position: relative;
  padding: 6px 0;
  transition: color .25s ease;
}

nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 2px;
  background: var(--primary-light);
  transition: width .25s ease;
}

nav a:hover {
  color: #ffffff;
}

nav a:hover::after {
  width: 100%;
}

.nav-btn {
  background: linear-gradient(135deg, #2563eb, #1e40af);
  padding: 10px 20px;
  border-radius: 999px;
  font-weight: 600;
  color: #ffffff !important;
  box-shadow: 0 8px 20px rgba(37,99,235,.45);
}

/* =====================
   HERO
===================== */
.hero {
  background: radial-gradient(circle at top, #1e3a8a, #020617);
  color: white;
  padding: 140px 0 120px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-text {
  max-width: 620px;
}

.badge {
  background: rgba(255,255,255,.14);
  padding: 8px 18px;
  border-radius: 999px;
  font-size: .75rem;
  display: inline-block;
  margin-bottom: 22px;
}

.hero h1 {
  font-size: 3.3rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 20px;
}

.hero h1 span {
  color: var(--primary-light);
}

.hero p {
  font-size: 1.05rem;
  color: #cbd5f5;
  margin-bottom: 34px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn-primary {
  background: var(--primary);
  color: white;
  padding: 14px 28px;
  border-radius: 12px;
  text-decoration: none;
  font-weight: 600;
}

.btn-outline {
  border: 2px solid #93c5fd;
  color: white;
  padding: 14px 28px;
  border-radius: 12px;
  text-decoration: none;
}

/* HERO CARD */
.hero-card {
  background: rgba(255,255,255,.12);
  backdrop-filter: blur(16px);
  border-radius: 22px;
  padding: 34px;
}

.hero-card h3 {
  margin-bottom: 18px;
}

.hero-card ul {
  padding-left: 20px;
}

.hero-card li {
  margin-bottom: 12px;
  color: #e0e7ff;
}

/* =====================
   FEATURES
===================== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit,minmax(260px,1fr));
  gap: 30px;
}

.feature-card {
  background: white;
  padding: 38px;
  border-radius: 20px;
  box-shadow: 0 25px 45px rgba(0,0,0,.08);
}

/* =====================
   SKILLS
===================== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit,minmax(240px,1fr));
  gap: 22px;
}

.skill {
  background: white;
  padding: 22px;
  border-radius: 14px;
  text-align: center;
  font-weight: 600;
}

/* =====================
   CAREERS
===================== */
.career-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit,minmax(220px,1fr));
  gap: 22px;
}

.career-card {
  background: linear-gradient(135deg, #2563eb, #1e40af);
  color: white;
  padding: 24px;
  border-radius: 16px;
  text-align: center;
  font-weight: 600;
}

/* =====================
   ENROLL
===================== */
.enroll {
  background: linear-gradient(135deg, #020617, #1e293b);
  color: white;
}

.enroll-box {
  max-width: 600px;
  margin: auto;
  text-align: center;
}

.enroll-box p {
  color: #c7d2fe;
}

.enroll form {
  margin-top: 32px;
  display: flex;
  flex-direction: column;
}

.enroll input,
.enroll button {
  padding: 15px;
  margin-bottom: 15px;
  border-radius: 12px;
  border: none;
}

.enroll button {
  background: var(--primary);
  color: white;
  font-weight: 700;
  cursor: pointer;
}

/* =====================
   FOOTER
===================== */
.footer {
  background: #020617;
  color: #94a3b8;
  text-align: center;
  padding: 32px;
}

/* =====================
   RESPONSIVE
===================== */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding: 100px 0;
  }

  .hero h1 {
    font-size: 2.3rem;
  }

  .hero-card {
    margin-top: 40px;
  }

  .section {
    padding: 90px 0;
  }
}