/* SalaryLab — clean, mobile-first, zero external requests */
:root {
  --bg: #f7f9fb;
  --surface: #ffffff;
  --ink: #14202b;
  --muted: #5b6b7a;
  --line: #e3eaf1;
  --accent: #0e7c6b;
  --accent-dark: #0a5f53;
  --warn: #b3541e;
  --radius: 14px;
  --max: 760px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
}
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }

/* header / nav */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 10;
}
.site-header .wrap {
  display: flex; align-items: center; justify-content: space-between;
  padding-top: 12px; padding-bottom: 12px;
}
.brand { font-weight: 800; font-size: 1.25rem; color: var(--ink); text-decoration: none; }
.brand span { color: var(--accent); }
.site-nav a {
  color: var(--muted); text-decoration: none; font-size: 0.95rem; margin-left: 18px;
  white-space: nowrap;
}
.site-nav a[aria-current="page"] { color: var(--accent-dark); font-weight: 700; }
.site-nav a:hover { color: var(--ink); }

/* hero */
.hero { padding: 40px 0 8px; }
.hero h1 { font-size: 2rem; line-height: 1.25; margin: 0 0 10px; letter-spacing: -0.01em; }
.hero p.lede { color: var(--muted); font-size: 1.05rem; margin: 0; max-width: 60ch; }

/* calculator card */
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  margin: 28px 0;
  box-shadow: 0 2px 10px rgba(20, 32, 43, 0.04);
}
.card h2 { margin: 0 0 4px; font-size: 1.2rem; }
.card .hint { color: var(--muted); font-size: 0.92rem; margin: 0 0 18px; }

.field { margin-bottom: 16px; }
.field label { display: block; font-weight: 650; margin-bottom: 6px; font-size: 0.98rem; }
.field small { display: block; color: var(--muted); font-weight: 400; margin-top: 4px; font-size: 0.85rem; }
.field input, .field select {
  width: 100%;
  font: inherit;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: var(--ink);
}
.field input:focus, .field select:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: var(--accent);
}
.field-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 560px) { .field-grid { grid-template-columns: 1fr; } }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 6px; }
button.btn {
  font: inherit; font-weight: 700; cursor: pointer;
  background: var(--accent); color: #fff; border: none;
  border-radius: 10px; padding: 13px 22px;
}
button.btn:hover { background: var(--accent-dark); }
button.btn-ghost {
  background: transparent; color: var(--muted); border: 1px solid var(--line);
}
button.btn-ghost:hover { color: var(--ink); }

/* results */
.results { display: none; }
.results.show { display: block; }
.big-number {
  background: var(--ink);
  color: #fff;
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  margin: 20px 0;
}
.big-number .eyebrow {
  text-transform: uppercase; letter-spacing: 0.08em;
  font-size: 0.8rem; color: #9fb3c4; margin-bottom: 6px;
}
.big-number .value { font-size: 3rem; font-weight: 800; letter-spacing: -0.02em; line-height: 1.1; }
.big-number .value small { font-size: 1.2rem; font-weight: 600; color: #9fb3c4; }
.big-number .delta { margin-top: 10px; font-size: 1.05rem; color: #ffd9a8; }
.big-number.nominal .delta { color: #9fd8c9; }
.big-number.nominal .value { font-size: 2.4rem; }
.result-lines { margin: 0; padding: 0; list-style: none; }
.result-lines li {
  display: flex; justify-content: space-between; gap: 12px;
  padding: 10px 2px; border-bottom: 1px dashed var(--line);
  font-size: 0.98rem;
}
.result-lines li:last-child { border-bottom: none; }
.result-lines .k { color: var(--muted); }
.result-lines .v { font-weight: 700; white-space: nowrap; }
.warn-note {
  background: #fff7ed; border: 1px solid #f4d9b8; color: #7a4a12;
  border-radius: 10px; padding: 12px 16px; font-size: 0.9rem; margin-top: 16px;
}

/* explainer + faq */
section.block { margin: 36px 0; }
section.block h2 { font-size: 1.35rem; margin: 0 0 12px; }
section.block p, section.block li { color: #33414f; }
.formula {
  background: var(--surface); border: 1px solid var(--line); border-radius: 10px;
  padding: 14px 18px; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.95rem; overflow-x: auto; margin: 12px 0;
}
.faq details {
  background: var(--surface); border: 1px solid var(--line); border-radius: 10px;
  padding: 14px 18px; margin-bottom: 10px;
}
.faq summary { font-weight: 650; cursor: pointer; }
.faq summary::marker { color: var(--accent); }
.faq p { margin: 8px 0 2px; color: #33414f; }

.site-footer {
  border-top: 1px solid var(--line); margin-top: 48px; padding: 26px 0 40px;
  color: var(--muted); font-size: 0.9rem;
}
.site-footer a { color: var(--accent-dark); }

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #10161d; --surface: #172029; --ink: #e8eef4; --muted: #93a5b5;
    --line: #26333f; --accent: #35b598; --accent-dark: #63d3b9; --warn: #e09a55;
  }
  .field input, .field select { background: #10161d; }
  .big-number .eyebrow { color: #8fa3b5; }
  section.block p, section.block li { color: #c3cfda; }
  .faq p { color: #c3cfda; }
  .warn-note { background: #241a0e; border-color: #6b4a1e; color: #e8b96f; }
}