:root {
  --bg: #f4f1ea;
  --panel: #fffdf8;
  --ink: #14221e;
  --muted: #5f6965;
  --accent: #0f766e;
  --accent-2: #d97706;
  --line: #d8d1c2;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background-color: var(--bg);
  background-image:
    radial-gradient(120% 100% at 8% 4%, #f9eacc 0%, transparent 55%),
    radial-gradient(100% 90% at 92% 90%, #c7f0df 0%, transparent 52%),
    linear-gradient(160deg, #f4f1ea 0%, #eef4ef 52%, #f4f1ea 100%);
  background-repeat: no-repeat;
  background-size: cover;
  min-height: 100svh;
}

.container {
  max-width: 840px;
  margin: 0 auto;
  padding: calc(18px + env(safe-area-inset-top)) 18px calc(24px + env(safe-area-inset-bottom));
}

header {
  max-width: 560px;
  margin: 0 auto 20px;
}

h1, h2 {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(1.6rem, 2.7vw, 2.6rem); }
h2 { font-size: clamp(1.2rem, 2vw, 1.7rem); margin-bottom: 12px; }

.sub {
  margin-top: 8px;
  color: var(--muted);
}

.nav {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 560px;
  margin: 18px auto 0;
}

.card {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  padding: 14px;
  box-shadow: 0 2px 0 rgba(20, 34, 30, 0.08), 0 8px 20px rgba(20, 34, 30, 0.05);
  transition: transform 140ms ease, box-shadow 140ms ease, border-color 140ms ease;
}

.card-link {
  display: block;
  color: var(--ink);
  text-decoration: none;
}

.tool-title {
  font-weight: 700;
}

.card-link:hover,
.card-link:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 4px 0 rgba(20, 34, 30, 0.1), 0 14px 24px rgba(20, 34, 30, 0.09);
  border-color: #b9c4bf;
}

.card-link:active {
  transform: translateY(0);
  box-shadow: 0 1px 0 rgba(20, 34, 30, 0.08), 0 6px 14px rgba(20, 34, 30, 0.06);
}

.panel {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--panel);
  padding: 16px;
  margin-top: 16px;
}

label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
}

input, select {
  width: 100%;
  padding: 10px;
  border-radius: 10px;
  border: 1px solid #b7c0bc;
  background: #fff;
}

.grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

button {
  margin-top: 12px;
  border: none;
  border-radius: 11px;
  background: var(--accent);
  color: #fff;
  padding: 10px 14px;
  font-weight: 700;
  cursor: pointer;
}

button.secondary { background: var(--accent-2); }

.result {
  margin-top: 12px;
  padding: 12px;
  border-radius: 12px;
  background: #eefaf6;
  border: 1px solid #b6e2d6;
}

.table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 12px;
}

.table th, .table td {
  text-align: left;
  border-bottom: 1px solid var(--line);
  padding: 8px;
  font-size: 0.95rem;
}

.mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }

.small { font-size: 0.9rem; color: var(--muted); }

footer {
  margin-top: 22px;
  font-size: 0.9rem;
  color: var(--muted);
}