:root {
  --bg-main: #0b0e13;
  --bg-section: #0f131a;
  --bg-card: linear-gradient(145deg, #171c26, #0f131b);
  --accent: #3b82f6;
  --text-muted: #b6bcc9;
}

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

body {
  background: radial-gradient(circle at top right, #1c2433, var(--bg-main) 55%);
  color: #ffffff;
}

/* ================= HEADER ================= */

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(11,14,19,0.9);
  backdrop-filter: blur(12px);
}

.nav-inner {
  max-width: 1300px;
  margin: auto;
  padding: 20px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  height: 68px;
}

.desktop-nav a {
  margin-left: 28px;
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
}

.hamburger {
  display: none;
  background: none;
  border: none;
  flex-direction: column;
  gap: 6px;
  cursor: pointer;
}

.hamburger span {
  width: 30px;
  height: 3px;
  background: white;
  border-radius: 2px;
}

/* MOBILE MENU */
.mobile-nav {
  display: none;
  flex-direction: column;
  background: #0f131a;
  padding: 20px 32px;
}

.mobile-nav a {
  padding: 14px 0;
  color: white;
  font-size: 1.1rem;
  text-decoration: none;
}

/* ================= SECTIONS ================= */

.section {
  padding: 100px 28px;
}

.section.alt {
  background: var(--bg-section);
}

.container {
  max-width: 1200px;
  margin: auto;
}

.hero h1 {
  font-size: 3.6rem;
  margin-bottom: 18px;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 760px;
}

/* ================= BUTTONS ================= */

.btn {
  display: inline-block;
  margin-top: 32px;
  padding: 16px 34px;
  background: var(--accent);
  color: #fff;
  border-radius: 999px;
  font-weight: 700;
  text-decoration: none;
}

/* ================= CARDS ================= */

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 36px;
}

.card {
  background: var(--bg-card);
  border-radius: 24px;
  padding: 44px;
  box-shadow: 0 35px 90px rgba(0,0,0,0.75);
}

.card h2,
.card h3 {
  margin-bottom: 14px;
}

.card p {
  color: var(--text-muted);
  line-height: 1.65;
}

/* ================= LISTS ================= */

ul {
  margin-top: 18px;
  padding-left: 20px;
}

li {
  margin-bottom: 10px;
  color: var(--text-muted);
}

/* ================= FOOTER ================= */

footer {
  padding: 60px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ================= RESPONSIVE ================= */

@media (max-width: 900px) {
  .desktop-nav {
    display: none;
  }
  .hamburger {
    display: flex;
  }
}