:root {
  color-scheme: light;
  --bg: #f5f6f8;
  --panel: #ffffff;
  --text: #1f2430;
  --muted: #6b7280;
  --border: #e2e4e9;
  --accent: #2563eb;
  --up: #b91c1c;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 1.5rem;
}

h1 { margin-top: 0; }
.muted { color: var(--muted); }
.error { color: var(--up); font-weight: 600; }

.login-box {
  max-width: 320px;
  margin: 4rem auto;
  padding: 2rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.login-box form { display: flex; flex-direction: column; gap: 0.9rem; }
.login-box label { display: flex; flex-direction: column; gap: 0.3rem; font-size: 0.9rem; }
.login-box input {
  padding: 0.5rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 1rem;
}
.login-box button {
  padding: 0.6rem;
  border: none;
  border-radius: 6px;
  background: var(--accent);
  color: white;
  font-weight: 600;
  cursor: pointer;
}
.login-box button:hover { opacity: 0.9; }

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 1.5rem;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
}

.tool-card {
  display: block;
  padding: 1.25rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  text-decoration: none;
  color: var(--text);
  transition: box-shadow 0.15s;
}
.tool-card:hover { box-shadow: 0 2px 10px rgba(0,0,0,0.08); border-color: var(--accent); }
.tool-icon { font-size: 1.8rem; }
.tool-name { font-weight: 700; margin-top: 0.4rem; }
.tool-desc { font-size: 0.85rem; margin-top: 0.2rem; }