:root {
  --bg: #f6f7fb;
  --ink: #1f2533;
  --card: #ffffff;
  --line: #d7dcea;
  --brand: #1d5bd8;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", sans-serif;
  color: var(--ink);
  background: radial-gradient(circle at top left, #eef3ff, var(--bg));
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.8rem 1.2rem;
  border-bottom: 1px solid var(--line);
  background: var(--card);
}

.topbar nav {
  display: flex;
  gap: 0.8rem;
}

.topbar a {
  color: var(--brand);
  text-decoration: none;
}

.container {
  max-width: 960px;
  margin: 2rem auto;
  padding: 0 1rem;
}

.panel {
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 12px;
  padding: 1.2rem;
}

.narrow {
  max-width: 420px;
  margin: 0 auto;
}

.stack {
  display: grid;
  gap: 0.5rem;
}

input,
button {
  padding: 0.6rem;
  border-radius: 8px;
  border: 1px solid var(--line);
}

button {
  background: var(--brand);
  color: #fff;
  border: none;
}

.grid {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.8rem;
}

.card {
  border: 1px solid var(--line);
  background: #fdfdff;
  border-radius: 10px;
  padding: 1rem;
  text-decoration: none;
  color: var(--ink);
}

.button-link {
  display: inline-block;
  margin-top: 0.4rem;
  color: var(--brand);
  text-decoration: none;
  font-weight: 600;
}