:root {
  --tool-ink: #14213d;
  --tool-muted: #607086;
  --tool-panel: rgba(255, 255, 255, 0.9);
  --tool-line: rgba(20, 33, 61, 0.13);
  --tool-accent: #007f73;
  --tool-warm: #ffb703;
  --tool-blue: #1d4ed8;
}

body {
  color: var(--tool-ink);
  background:
    linear-gradient(120deg, rgba(0, 127, 115, 0.22), transparent 28%),
    radial-gradient(circle at 84% 12%, rgba(255, 183, 3, 0.35), transparent 26%),
    radial-gradient(circle at 12% 82%, rgba(29, 78, 216, 0.18), transparent 32%),
    linear-gradient(145deg, #f8fbff 0%, #eef7f3 48%, #fff7e6 100%);
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(20, 33, 61, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(20, 33, 61, 0.055) 1px, transparent 1px);
  background-size: 34px 34px;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.58), transparent 76%);
}

.tool-shell {
  position: relative;
  z-index: 1;
  width: min(100%, 1040px);
  margin: 0 auto;
  padding: 22px 16px;
}

.tool-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 18px;
  padding: 10px 12px;
  border: 1px solid var(--tool-line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(14px);
  box-shadow: 0 16px 40px rgba(20, 33, 61, 0.08);
}

.tool-brand {
  color: var(--tool-ink);
  font-weight: 700;
  text-decoration: none;
  letter-spacing: 0;
  white-space: nowrap;
}

.tool-links {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.tool-links a {
  color: var(--tool-muted);
  text-decoration: none;
  padding: 8px 10px;
  border-radius: 10px;
  font-size: 14px;
}

.tool-links a:hover,
.tool-links a.active {
  color: #053f38;
  background: rgba(0, 127, 115, 0.12);
}

.card,
.hub-panel {
  background: var(--tool-panel) !important;
  border-color: var(--tool-line) !important;
  box-shadow: 0 22px 60px rgba(20, 33, 61, 0.12) !important;
  backdrop-filter: blur(18px);
}

.hub-panel {
  border: 1px solid var(--tool-line);
  border-radius: 16px;
  padding: 22px;
}

.hub-title {
  margin: 0;
  font-size: clamp(28px, 5vw, 48px);
  line-height: 1.08;
}

.hub-desc {
  max-width: 640px;
  margin: 12px 0 0;
  color: var(--tool-muted);
  line-height: 1.7;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin-top: 22px;
}

.tool-card {
  min-height: 150px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 18px;
  padding: 16px;
  border: 1px solid var(--tool-line);
  border-radius: 12px;
  color: var(--tool-ink);
  text-decoration: none;
  background: rgba(255, 255, 255, 0.62);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.tool-card:hover {
  transform: translateY(-2px);
  border-color: rgba(0, 127, 115, 0.34);
  box-shadow: 0 14px 30px rgba(20, 33, 61, 0.1);
}

.tool-card strong {
  display: block;
  font-size: 18px;
  margin-bottom: 8px;
}

.tool-card span {
  color: var(--tool-muted);
  line-height: 1.6;
}

.tool-card b {
  color: var(--tool-accent);
  font-size: 14px;
}

@media (max-width: 640px) {
  .tool-nav {
    align-items: flex-start;
    flex-direction: column;
  }

  .tool-links {
    justify-content: flex-start;
  }
}