:root {
  --bg: #0f172a;
  --card: #111827;
  --box: #1f2937;
  --text: #f8fafc;
  --muted: #94a3b8;
  --primary: #38bdf8;
  --primary-dark: #0284c7;
  --border: rgba(255, 255, 255, 0.08);
}

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

body {
  min-height: 100vh;
  font-family: Arial, Helvetica, sans-serif;
  background:
    radial-gradient(circle at top left, rgba(56, 189, 248, 0.22), transparent 35%),
    var(--bg);
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px;
}

.container {
  width: 100%;
  max-width: 980px;
}

.card {
  background: rgba(17, 24, 39, 0.9);
  border: 1px solid var(--border);
  border-radius: 28px;
  padding: 40px;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(16px);
}

.profile {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-bottom: 28px;
}

.avatar {
  width: 130px;
  height: 130px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--primary);
}

.tag {
  color: var(--primary);
  font-weight: bold;
  margin-bottom: 8px;
}

h1 {
  font-size: clamp(2rem, 5vw, 4rem);
  line-height: 1;
}

h2 {
  color: var(--muted);
  font-size: 1.1rem;
  margin-top: 12px;
  font-weight: 400;
}

.description {
  color: var(--muted);
  font-size: 1.1rem;
  line-height: 1.7;
  max-width: 760px;
}

.buttons {
  display: flex;
  gap: 14px;
  margin-top: 32px;
  flex-wrap: wrap;
}

.btn {
  text-decoration: none;
  padding: 14px 22px;
  border-radius: 999px;
  font-weight: bold;
  transition: 0.2s ease;
}

.primary {
  background: var(--primary);
  color: #020617;
}

.primary:hover {
  background: var(--primary-dark);
  color: white;
}

.secondary {
  color: var(--text);
  border: 1px solid var(--border);
}

.secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 18px;
}

.box {
  background: rgba(31, 41, 55, 0.82);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 24px;
}

.box h3 {
  margin-bottom: 12px;
  color: var(--primary);
}

.box p {
  color: var(--muted);
  line-height: 1.6;
}

@media (max-width: 768px) {
  body {
    padding: 20px;
    align-items: flex-start;
  }

  .card {
    padding: 28px;
  }

  .profile {
    flex-direction: column;
    align-items: flex-start;
  }

  .grid {
    grid-template-columns: 1fr;
  }
}