:root {
  --navy: #00205b;
  --navy-dark: #001740;
  --blue: #0033a1;
  --blue-soft: #e8edf7;
  --text: #374151;
  --muted: #6b7280;
  --bg: #f8f8f8;
  --card: #ffffff;
  --border: #e2e6ee;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

/* ---------- Header ---------- */
header {
  background: var(--navy);
  color: #fff;
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: 0 2px 10px rgba(0, 32, 91, 0.25);
}

.header-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0.7rem 1.2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: #fff;
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: 0.02em;
}

.brand .gear { font-size: 1.4rem; }
.brand span.motor { color: #9db6e8; }

nav { display: flex; gap: 0.3rem; flex-wrap: wrap; }

nav a {
  color: #d5deef;
  text-decoration: none;
  padding: 0.4rem 0.85rem;
  border-radius: 6px;
  font-size: 0.95rem;
  transition: background 0.15s, color 0.15s;
}

nav a:hover { background: rgba(255, 255, 255, 0.12); color: #fff; }
nav a.active { background: var(--blue); color: #fff; }

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(135deg, var(--navy) 0%, var(--blue) 100%);
  color: #fff;
  padding: 3.5rem 1.2rem 3rem;
  text-align: center;
}

.hero h1 { font-size: clamp(1.6rem, 4vw, 2.4rem); margin-bottom: 0.6rem; }
.hero p { color: #c9d6ef; max-width: 640px; margin: 0 auto; font-size: 1.05rem; }

/* ---------- Layout ---------- */
main { max-width: 1180px; margin: 0 auto; padding: 2rem 1.2rem 4rem; }

.section-title {
  color: var(--navy);
  font-size: 1.35rem;
  margin: 2rem 0 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 3px solid var(--blue);
  display: inline-block;
}

/* ---------- Tool cards (menu) ---------- */
.tools {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.2rem;
  margin-top: 1.2rem;
}

.tool-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.4rem;
  text-decoration: none;
  color: var(--text);
  transition: transform 0.15s, box-shadow 0.15s, border-color 0.15s;
  display: block;
}

.tool-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(0, 32, 91, 0.12);
  border-color: var(--blue);
}

.tool-card .icon { font-size: 1.8rem; }

.tool-card h3 { color: var(--navy); margin: 0.5rem 0 0.3rem; font-size: 1.1rem; }
.tool-card p { font-size: 0.9rem; color: var(--muted); }

.tool-card.soon {
  opacity: 0.55;
  pointer-events: none;
  border-style: dashed;
}

.badge {
  display: inline-block;
  background: var(--blue-soft);
  color: var(--blue);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.1rem 0.55rem;
  border-radius: 999px;
  margin-top: 0.5rem;
}

.badge.gray { background: #eceef1; color: var(--muted); }

/* ---------- Calculator panel ---------- */
.panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem;
  margin: 1.2rem 0 2rem;
}

.calc-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: flex-end;
}

.calc-field { display: flex; flex-direction: column; gap: 0.3rem; }

.calc-field label { font-size: 0.85rem; font-weight: 600; color: var(--navy); }

.calc-field input,
.calc-field select {
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 7px;
  font-size: 1rem;
  min-width: 150px;
  background: #fff;
  color: var(--text);
}

.calc-field input:focus,
.calc-field select:focus {
  outline: 2px solid var(--blue);
  border-color: var(--blue);
}

.calc-result {
  margin-top: 1.2rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0.9rem;
}

.result-box {
  background: var(--blue-soft);
  border-radius: 8px;
  padding: 0.8rem 1rem;
  text-align: center;
}

.result-box .label { font-size: 0.78rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; }
.result-box .value { font-size: 1.25rem; font-weight: 700; color: var(--navy); font-variant-numeric: tabular-nums; }

.calc-error { margin-top: 1rem; color: #b42318; font-weight: 600; display: none; }

/* ---------- Tables ---------- */
.table-wrap {
  overflow-x: auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  margin: 1rem 0 2.5rem;
}

table.tol {
  border-collapse: collapse;
  width: 100%;
  min-width: 860px;
  font-size: 0.82rem;
  font-variant-numeric: tabular-nums;
}

table.tol th,
table.tol td {
  border: 1px solid #d3dae8;
  text-align: center;
  padding: 0.28rem 0.45rem;
  white-space: nowrap;
}

table.tol thead th {
  background: var(--navy);
  color: #fff;
  font-weight: 600;
  position: sticky;
  top: 0;
}

table.tol thead tr:nth-child(2) th { background: var(--blue); }

table.tol td.cls {
  background: var(--navy);
  color: #fff;
  font-weight: 700;
  min-width: 52px;
}

table.tol td .u { display: block; color: var(--navy); font-weight: 600; }
table.tol td .l { display: block; color: var(--muted); }

table.tol tbody tr:nth-child(even) td:not(.cls) { background: #f4f7fc; }
table.tol tbody tr:hover td:not(.cls) { background: var(--blue-soft); }

.table-note { font-size: 0.85rem; color: var(--muted); margin: -0.4rem 0 1.5rem; }

/* ---------- Footer ---------- */
footer {
  background: var(--navy-dark);
  color: #9db6e8;
  padding: 1.5rem 1.2rem;
  text-align: center;
  font-size: 0.88rem;
}

footer a { color: #d5deef; }

@media (max-width: 600px) {
  .hero { padding: 2.4rem 1rem 2rem; }
  .calc-row { flex-direction: column; align-items: stretch; }
  .calc-field input, .calc-field select { min-width: 0; width: 100%; }
}