:root {
  --ink: #333333;
  --muted: #666666;
  --paper: #f5f7fa;
  --card: #ffffff;
  --line: #e1e5eb;
  --accent: #2d5a87;
  --accent-dark: #1e3a5f;
  --hover: #e8eef5;
  --shadow: 0 2px 10px rgba(30, 58, 95, 0.08);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.55;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.site-header {
  padding: 20px 8vw;
  background: linear-gradient(135deg, #1e3a5f 0%, #2d5a87 100%);
  color: #fff;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.site-header h1 {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.site-header p {
  margin: 6px 0 0;
  font-size: 0.92rem;
  opacity: 0.88;
}

main {
  flex: 1;
  max-width: 720px;
  margin: 0 auto;
  padding: 5vh 8vw 8vh;
  width: 100%;
}

main > p {
  margin: 0 0 28px;
  color: var(--muted);
  font-size: 1.02rem;
}

.tools {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.tools a {
  display: block;
  padding: 16px 18px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 6px;
  box-shadow: var(--shadow);
  color: inherit;
  text-decoration: none;
  transition: background 0.12s ease, border-color 0.12s ease;
}

.tools a:hover {
  background: var(--hover);
  border-color: #c5cdd6;
  text-decoration: none;
}

.tools .name {
  display: block;
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--accent-dark);
}

.tools .desc {
  display: block;
  margin-top: 4px;
  font-size: 0.9rem;
  color: var(--muted);
}

.tools .url {
  display: block;
  margin-top: 4px;
  font-size: 0.82rem;
  color: var(--muted);
  word-break: break-all;
}

.site-footer {
  padding: 20px 8vw;
  font-size: 0.75rem;
  color: var(--muted);
}

.section-label {
  margin: 28px 0 10px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

.hub-error {
  color: #8a3b3b;
  font-size: 0.95rem;
}