/* EngTool Packed Tower Calculator - shared styles */
:root {
  --primary: #1a5c9e;
  --primary-dark: #124274;
  --primary-light: #e8f0fa;
  --accent: #e8a33d;
  --ok: #2e7d32;
  --warn: #b26a00;
  --danger: #c62828;
  --bg: #f4f6f9;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #d9dee7;
  --shadow: 0 2px 8px rgba(16, 42, 67, 0.08);
}

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

html { font-size: 16px; }

body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", "Noto Sans JP",
    "Noto Sans KR", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ---------- Top bar ---------- */
.topbar {
  background: linear-gradient(90deg, var(--primary-dark), var(--primary));
  color: #fff;
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}
.topbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.3px;
  text-decoration: none;
  color: #fff;
}
.brand .logo {
  width: 30px;
  height: 30px;
  border-radius: 7px;
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1rem;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border: none;
  border-radius: 6px;
  font-size: 0.9rem;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s, transform 0.05s;
  color: #fff;
  background: rgba(255, 255, 255, 0.14);
}
.btn:hover { background: rgba(255, 255, 255, 0.26); }
.btn:active { transform: translateY(1px); }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: #d18f2a; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-ghost { background: transparent; border: 1px solid var(--border); color: var(--primary); }
.btn-ghost:hover { background: var(--primary-light); }
.btn-sm { padding: 5px 10px; font-size: 0.82rem; }

select.lang-select {
  padding: 7px 8px;
  border: 1px solid rgba(255,255,255,0.35);
  border-radius: 6px;
  background: rgba(255,255,255,0.14);
  color: #fff;
  font-size: 0.88rem;
  cursor: pointer;
}
select.lang-select option { color: #1f2937; }

/* ---------- Windows-style menu bar ---------- */
.menu-bar { display: flex; align-items: stretch; gap: 2px; flex-wrap: wrap; }
.menu-group { position: relative; }
.menu-item {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 7px 12px;
  background: transparent;
  border: none;
  color: #e8eef6;
  font-size: 0.9rem;
  cursor: pointer;
  text-decoration: none;
  border-radius: 5px;
  white-space: nowrap;
}
.menu-item:hover { background: rgba(255, 255, 255, 0.18); color: #fff; }
.menu-item::after { content: "▾"; font-size: 0.7rem; opacity: 0.7; margin-left: 2px; }
.menu-item.no-arrow::after { content: ""; }
.menu-drop {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 260px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 10px 28px rgba(16, 42, 67, 0.18);
  padding: 6px;
  z-index: 200;
}
.menu-group:hover .menu-drop,
.menu-group:focus-within .menu-drop { display: block; }
.menu-drop a {
  display: block;
  padding: 8px 12px;
  color: var(--text);
  text-decoration: none;
  font-size: 0.88rem;
  border-radius: 6px;
}
.menu-drop a:hover { background: var(--primary-light); color: var(--primary-dark); }
.menu-drop .menu-head {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
  padding: 6px 12px 2px;
}
.topbar-right { display: flex; align-items: center; gap: 8px; margin-left: auto; flex-wrap: wrap; }

/* Section steps (scrubber) */
.step {
  background: var(--primary-light);
  border-radius: 20px;
  color: var(--primary-dark);
  font-weight: 700;
  font-size: 0.78rem;
  padding: 2px 10px;
}

/* ---------- Layout ---------- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px 16px 40px;
  flex: 1;
  width: 100%;
}

/* Nav cards on home */
.page-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}
.page-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px;
  box-shadow: var(--shadow);
  text-decoration: none;
  color: var(--text);
  transition: transform 0.12s, box-shadow 0.12s;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.page-card:hover { transform: translateY(-3px); box-shadow: 0 6px 18px rgba(16,42,67,0.14); }
.page-card .card-icon {
  width: 44px; height: 44px;
  border-radius: 10px;
  background: var(--primary-light);
  color: var(--primary);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem;
}
.page-card h3 { font-size: 1.05rem; color: var(--primary-dark); }
.page-card p { font-size: 0.88rem; color: var(--muted); }

/* Page header + breadcrumb */
.page-head { margin-bottom: 18px; }
.page-head h1 { font-size: 1.5rem; color: var(--primary-dark); margin-bottom: 4px; }
.page-head .sub { color: var(--muted); font-size: 0.92rem; }

/* Category headings on home */
.cat-title {
  font-size: 0.95rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin: 22px 0 12px;
  padding-left: 10px;
  border-left: 4px solid var(--accent);
}

/* Cards */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: var(--shadow);
  margin-bottom: 18px;
  overflow: hidden;
}
.card > .card-title {
  background: var(--primary-light);
  color: var(--primary-dark);
  font-weight: 700;
  font-size: 1rem;
  padding: 12px 18px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
}
.card > .card-body { padding: 18px; }
.card-title .badge {
  margin-left: auto;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 20px;
  background: var(--accent);
  color: #fff;
}

/* Input rows */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 12px 18px;
}
.field { display: flex; flex-direction: column; gap: 4px; }
.field label { font-size: 0.85rem; color: var(--muted); font-weight: 600; }
.field label .req { color: var(--danger); }
.input-wrap { position: relative; display: flex; align-items: center; }
.input-wrap input, .input-wrap select {
  width: 100%;
  padding: 9px 12px;
  padding-right: 70px;
  border: 1px solid var(--border);
  border-radius: 7px;
  font-size: 0.95rem;
  background: #fff;
  color: var(--text);
  transition: border 0.15s, box-shadow 0.15s;
}
.input-wrap input:focus, .input-wrap select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(26,92,158,0.15);
}
.input-wrap select { padding-right: 10px; }
.input-wrap .unit {
  position: absolute;
  right: 10px;
  color: var(--muted);
  font-size: 0.8rem;
  background: #f0f2f5;
  padding: 2px 8px;
  border-radius: 4px;
  white-space: nowrap;
  pointer-events: none;
}

/* Buttons row */
.actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 6px; }

/* Results table */
table.results {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}
table.results th {
  background: var(--primary);
  color: #fff;
  padding: 9px 12px;
  text-align: left;
  font-weight: 600;
  font-size: 0.85rem;
}
table.results td {
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
}
table.results tr:nth-child(even) td { background: #f7f9fc; }
table.results tr:hover td { background: var(--primary-light); }
table.results td.key { color: var(--muted); font-size: 0.85rem; }
table.results td.val { font-weight: 600; font-variant-numeric: tabular-nums; text-align: right; }
table.results td .formula-note { display: block; font-weight: 400; font-size: 0.78rem; color: var(--muted); }
td.highlight, .kpi {
  background: #fff8e8 !important;
  font-weight: 700;
  color: var(--warn);
}

/* Verdict */
.verdict {
  padding: 12px 16px;
  border-radius: 8px;
  font-weight: 700;
  margin-top: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.verdict.ok { background: #e8f5e9; color: var(--ok); border: 1px solid #a5d6a7; }
.verdict.warn { background: #fff3e0; color: var(--warn); border: 1px solid #ffcc80; }
.verdict.bad { background: #fdecea; color: var(--danger); border: 1px solid #ef9a9a; }

/* Note */
.note {
  background: #f7f9fc;
  border-left: 4px solid var(--primary);
  padding: 10px 14px;
  border-radius: 0 6px 6px 0;
  font-size: 0.85rem;
  color: #374151;
  margin-top: 12px;
}

/* Tabs */
.tabs { display: flex; gap: 4px; flex-wrap: wrap; border-bottom: 2px solid var(--border); margin-bottom: 16px; }
.tab-btn {
  padding: 9px 16px;
  background: transparent;
  border: none;
  border-bottom: 3px solid transparent;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
  margin-bottom: -2px;
}
.tab-btn:hover { color: var(--primary); }
.tab-btn.active { color: var(--primary); border-bottom-color: var(--primary); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* Data tables */
.data-table-wrap { overflow-x: auto; }
table.data {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  min-width: 560px;
}
table.data th {
  background: var(--primary-dark);
  color: #fff;
  padding: 8px 10px;
  text-align: left;
  font-weight: 600;
  position: sticky;
  top: 0;
}
table.data td {
  padding: 7px 10px;
  border-bottom: 1px solid var(--border);
  font-variant-numeric: tabular-nums;
}
table.data tr:nth-child(even) td { background: #f7f9fc; }
table.data tr:hover td { background: var(--primary-light); }
table.data td.num, table.data th.num { text-align: right; }
table.data td.num.muted { color: var(--muted); }
.table-caption {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--primary-dark);
  margin: 14px 0 6px;
}
.table-caption:first-child { margin-top: 0; }

/* Toolbar / filter controls */
.toolbar { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; flex-wrap: wrap; }
.text-input {
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.9rem;
  min-width: 260px;
  outline: none;
}
.text-input:focus { border-color: var(--primary); box-shadow: 0 0 0 2px rgba(26, 92, 158, 0.15); }
.count-chip {
  background: var(--primary-light);
  color: var(--primary-dark);
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 0.8rem;
  font-weight: 600;
}
table.data td.empty { text-align: center; color: var(--muted); padding: 18px; }
.unit-select {
  padding: 8px 6px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
  color: var(--text);
  font-size: 0.88rem;
  cursor: pointer;
  max-width: 130px;
}
.input-wrap select.unit-select { border-left: none; border-radius: 0 6px 6px 0; background: #f4f6f9; }
.field-wide { grid-column: 1 / -1; }
.field-wide .input-wrap select.unit-select {
  border-left: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
  max-width: none;
  width: 100%;
  padding: 9px 10px;
}

/* Formula display */
.formula {
  background: #f0f4fa;
  border: 1px dashed #b9c9dc;
  border-radius: 8px;
  padding: 12px 16px;
  font-size: 0.9rem;
  color: var(--primary-dark);
  overflow-x: auto;
  margin-top: 12px;
}
.formula .frac { display: inline-block; vertical-align: middle; text-align: center; margin: 0 4px; }
.formula .frac > span { display: block; padding: 0 6px; }
.formula .frac > span:first-child { border-bottom: 1px solid var(--primary-dark); }

/* Footer */
footer.site-footer {
  background: var(--primary-dark);
  color: #cfd9e6;
  padding: 18px 16px;
  text-align: center;
  font-size: 0.82rem;
}
footer.site-footer a { color: var(--accent); text-decoration: none; }

/* Home hero */
.hero {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: #fff;
  border-radius: 12px;
  padding: 30px 28px;
  margin-bottom: 22px;
  box-shadow: var(--shadow);
}
.hero h1 { font-size: 1.7rem; margin-bottom: 8px; }
.hero p { color: #d7e4f2; font-size: 0.98rem; max-width: 720px; }

/* Chart */
.chart-wrap {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px;
  overflow-x: auto;
}
.chart-wrap svg { display: block; max-width: 100%; }

/* Responsive */
@media (max-width: 640px) {
  html { font-size: 15px; }
  .brand { font-size: 0.95rem; }
  .topbar-inner { gap: 6px; }
  .btn { padding: 6px 10px; font-size: 0.82rem; }
  .hero { padding: 22px 18px; }
  .hero h1 { font-size: 1.35rem; }
}