:root {
  --bg: #f6f7f5;
  --surface: #ffffff;
  --surface-alt: #eef2f0;
  --border: #d9ded7;
  --text: #1f2a24;
  --text-muted: #526059;
  --accent: #0e7c6b;
  --accent-soft: #dff2ee;
  --accent-dark: #095247;
  --amber: #b46200;
  --amber-soft: #fff1df;
  --danger: #b33a3a;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow-sm: 0 1px 2px rgba(31, 42, 36, 0.06), 0 1px 3px rgba(31, 42, 36, 0.04);
  --shadow-md: 0 4px 12px rgba(31, 42, 36, 0.08);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: "SFMono-Regular", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 12px;
  background: var(--accent);
  color: #fff;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  z-index: 100;
}
.skip-link:focus { left: 12px; }

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 14px 0;
  position: sticky;
  top: 0;
  z-index: 20;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
}
.brand-mark {
  color: var(--accent);
  display: inline-flex;
}
.site-nav { display: flex; gap: 18px; flex-wrap: wrap; }
.site-nav a {
  color: var(--text-muted);
  font-size: 0.92rem;
  font-weight: 500;
}
.site-nav a:hover { color: var(--accent); text-decoration: none; }

.main-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 32px;
  padding-top: 40px;
  padding-bottom: 40px;
  align-items: start;
}

.calculator-panel { background: var(--surface); padding: 28px; border-radius: var(--radius); border: 1px solid var(--border); box-shadow: var(--shadow-sm); }
.panel-sub { color: var(--text-muted); margin: -4px 0 20px; font-size: 0.95rem; }

h1 { font-size: 1.6rem; margin: 0 0 4px; letter-spacing: -0.01em; }
h2 { font-size: 1.05rem; margin: 0 0 12px; color: var(--text); }
h3 { font-size: 0.98rem; margin: 0 0 8px; }

.preset-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 22px; }
.preset-btn {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 7px 14px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.preset-btn:hover { background: var(--accent-soft); border-color: var(--accent); color: var(--accent-dark); }
.preset-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }

.form-block { margin-bottom: 22px; padding-bottom: 20px; border-bottom: 1px dashed var(--border); }
.form-block:last-of-type { border-bottom: none; }

.field-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 14px; }
.field { display: flex; flex-direction: column; gap: 5px; }
.field label { font-size: 0.82rem; font-weight: 600; color: var(--text-muted); }
.field input {
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: var(--font);
  background: var(--surface);
  color: var(--text);
  transition: border-color 0.15s, box-shadow 0.15s;
}
.field input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }

.results-block { margin-top: 8px; }
.result-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin-bottom: 18px; }
.result-card {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.result-card.highlight { background: var(--accent-soft); border-color: var(--accent); }
.result-label { font-size: 0.78rem; color: var(--text-muted); font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; }
.result-value { font-size: 1.2rem; font-weight: 700; color: var(--text); }

.summary-box { background: var(--amber-soft); border: 1px solid #e8c99a; border-radius: var(--radius); padding: 18px; }
.summary-text {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px;
  font-size: 0.92rem;
  line-height: 1.6;
  white-space: pre-wrap;
  font-family: var(--font);
  min-height: 90px;
  color: var(--text);
}
.summary-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.copy-confirm { font-size: 0.85rem; color: var(--accent-dark); margin: 8px 0 0; min-height: 1.2em; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s, box-shadow 0.15s;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-dark); }
.btn-secondary { background: var(--surface); color: var(--text); border-color: var(--border); }
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }
.btn-ghost { background: transparent; color: var(--text-muted); padding: 6px 10px; font-size: 0.82rem; }
.btn-ghost:hover { color: var(--danger); }
.btn-ghost:disabled { opacity: 0.4; cursor: not-allowed; }

.side-panel { display: flex; flex-direction: column; gap: 20px; }
.side-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow-sm);
}
.side-card h2 { font-size: 1rem; margin-bottom: 10px; }
.side-note { font-size: 0.85rem; color: var(--text-muted); margin-top: 10px; }

.guide-list { margin: 0; padding-left: 18px; font-size: 0.9rem; color: var(--text); }
.guide-list li { margin-bottom: 6px; }

.scenario-list { margin: 0; font-size: 0.88rem; }
.scenario-list dt { font-weight: 600; color: var(--text); margin-top: 10px; }
.scenario-list dt:first-child { margin-top: 0; }
.scenario-list dd { margin: 4px 0 0; color: var(--text-muted); }

.mistake-list { margin: 0; padding-left: 18px; font-size: 0.88rem; color: var(--text); }
.mistake-list li { margin-bottom: 8px; }
.mistake-list strong { color: var(--amber); }

.history-list { max-height: 220px; overflow-y: auto; margin-bottom: 10px; }
.history-item {
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: border-color 0.15s;
}
.history-item:hover { border-color: var(--accent); }
.history-item .hist-title { font-weight: 600; color: var(--text); }
.history-item .hist-meta { color: var(--text-muted); font-size: 0.78rem; margin-top: 2px; }
.empty-state { color: var(--text-muted); font-size: 0.88rem; margin: 0; }

.content-band { background: var(--surface); border-top: 1px solid var(--border); padding: 40px 0; margin-top: 20px; }
.content-band h2 { font-size: 1.3rem; margin-bottom: 20px; }
.content-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 28px; }
.content-col h3 { font-size: 0.98rem; margin-bottom: 10px; }
.content-col ul { margin: 0; padding-left: 18px; font-size: 0.9rem; color: var(--text); }
.content-col li { margin-bottom: 6px; }

.site-footer {
  background: var(--surface-alt);
  border-top: 1px solid var(--border);
  padding: 20px 0;
  margin-top: 0;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.85rem;
  color: var(--text-muted);
}
.footer-links { display: flex; gap: 14px; }
.footer-links a { color: var(--text-muted); }
.footer-links a:hover { color: var(--accent); }

@media (max-width: 900px) {
  .main-grid { grid-template-columns: 1fr; }
  .calculator-panel { padding: 20px; }
  h1 { font-size: 1.35rem; }
}

@media (max-width: 520px) {
  .container { padding: 0 16px; }
  .field-grid { grid-template-columns: 1fr; }
  .result-cards { grid-template-columns: 1fr 1fr; }
  .summary-actions { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
}



/* Factory-injected deployment helpers. The AI owns the site design above this block. */
.ad-unit {
  width: min(100%, 720px);
  min-height: 120px;
  margin: 24px auto;
  display: block;
}

.legal-page {
  width: min(900px, calc(100% - 32px));
  margin: 40px auto;
}

.factory-fallback-nav {
  width: min(900px, calc(100% - 32px));
  margin: 24px auto 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  align-items: center;
  font-size: 0.95rem;
}

.factory-fallback-nav a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}