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

html, body {
  font-family: Inter, system-ui, Segoe UI, Roboto,
               Apple SD Gothic Neo, Malgun Gothic,
               Apple Color Emoji, emoji, sans-serif;
  background: #0b0d12;
  color: #e5e7eb;
  scroll-behavior: smooth;
}

body {
  background:
    radial-gradient(1200px 600px at 20% -10%, #1f2a44 0%, transparent 60%),
    radial-gradient(1000px 500px at 100% 10%, #3b2a55 0%, transparent 55%),
    linear-gradient(180deg, #0b0d12 0%, #0b0d12 100%);
}

header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 16px 40px;
  background: rgba(2, 6, 23, 0.75);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(148,163,184,.15);
}

.header-logo {
  font-weight: 800;
  font-size: 1.4rem;
  color: #818cf8;
}

header > div {
  font-size: .95rem;
  opacity: .9;
  cursor: pointer;
}

header > div:hover {
  opacity: 1;
}

.header-user {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 10px;
}

.header-user a {
  text-decoration: none;
  padding: 8px 18px;
  font-size: .85rem;
  font-weight: 700;
  color: #020617;
  background: #818cf8;
  border-radius: 999px;
  box-shadow: 0 0 0 rgba(0,0,0,0);
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}

.header-user a:hover {
  transform: translateY(-1px);
  background: #a5b4fc;
  box-shadow: 0 0 16px rgba(129,140,248,.5);
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 80px 28px 120px;
}

main section:first-of-type {
  padding: 90px 70px;
  margin-bottom: 120px;
  border-radius: 24px;
  background:
    radial-gradient(circle at 0 0, rgba(129,140,248,.18), transparent 55%),
    radial-gradient(circle at 100% 100%, rgba(45,212,191,.18), transparent 55%),
    rgba(15,23,42,.85);
  border: 1px solid rgba(148,163,184,.45);
  box-shadow: 0 28px 60px rgba(0,0,0,.65);
  backdrop-filter: blur(22px);
  animation: cardUp .7s ease forwards;
}

main section:first-of-type h1 {
  font-size: 2.8rem;
  font-weight: 800;
  margin-bottom: 22px;
}

main section:first-of-type p {
  font-size: 1.1rem;
  max-width: 720px;
  color: #c7d2fe;
}

main section:first-of-type strong {
  color: #a5b4fc;
}

section {
  margin-bottom: 90px;
  animation: cardUp .6s ease forwards;
}

section h2 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 18px;
  color: #ffffff;
}

section p {
  max-width: 720px;
  color: #cbd5f5;
}

section ul {
  list-style: none;
  margin-top: 22px;
}

section ul li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 14px;
  color: #d1d5db;
}

section ul li::before {
  content: ">";
  position: absolute;
  left: 0;
  color: #818cf8;
  font-weight: 700;
}

section a[href="/signup"] {
  display: inline-block;
  margin-top: 28px;
  padding: 14px 36px;
  border-radius: 999px;
  background: #818cf8;
  color: #020617;
  font-weight: 800;
  text-decoration: none;
  box-shadow: 0 0 0 rgba(0,0,0,0);
  transition: transform .25s ease, box-shadow .25s ease, background .25s ease;
}

section a[href="/signup"]:hover {
  transform: translateY(-2px);
  background: #a5b4fc;
  box-shadow: 0 0 22px rgba(129,140,248,.6);
}

footer {
  padding: 40px;
  border-top: none;
  background: rgba(2,6,23,.85);
  backdrop-filter: blur(18px);
}

.footer-lang {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: .9rem;
  color: #94a3b8;
}

.footer-lang select {
  background: #020617;
  color: #e5e7eb;
  border: 1px solid rgba(148,163,184,.4);
  border-radius: 8px;
  padding: 6px 10px;
}

@keyframes cardUp {
  0% { opacity:0; transform:translateY(18px) scale(.97); }
  100% { opacity:1; transform:translateY(0) scale(1); }
}

@media (max-width: 768px) {
  header {
    flex-wrap: wrap;
    padding: 14px 20px;
  }

  main {
    padding: 60px 18px 100px;
  }

  main section:first-of-type {
    padding: 60px 28px;
  }

  main section:first-of-type h1 {
    font-size: 2.1rem;
  }
}