/* BidVariance public-site stylesheet.
   Shared by the free-tools layer (/tools, calculators) and the explainer pages.
   Dark, serious, restrained, typographic. No gradients, glassmorphism or SaaS clichés. */

:root {
  --bg: #0b0e14;
  --panel: #141a24;
  --ink: #eef2f8;
  --muted: #94a0b4;
  --accent: #6ea8fe;
  --accent-strong: #8fbcff;
  --accent-ink: #0b2545; /* readable text-on-accent for small emphasis chips */
  --signal: #5eead4; /* teal — positive/probability data accents */
  --warn: #fcd34d; /* amber — loss/risk highlights */
  --line: rgba(148, 163, 184, 0.13);
  --line-strong: rgba(148, 163, 184, 0.28);
  --danger: #f6b3a8; /* soft warning tint for probability-over-budget results */
  --radius: 12px;
  --maxw: 60rem;
  --font:
    system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  font-size: 1rem;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

img,
svg {
  vertical-align: middle;
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
a:hover {
  border-bottom-color: currentColor;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 3px;
}

::selection {
  background: rgba(110, 168, 254, 0.28);
  color: var(--ink);
}

/* ------------------------------------------------------------------ header */
.site-header {
  border-bottom: 1px solid var(--line);
  background: rgba(11, 14, 20, 0.92);
}

.site-nav {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0.9rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--ink);
  font-weight: 700;
  letter-spacing: -0.01em;
  border: 0;
}
.brand:hover {
  border: 0;
  color: var(--ink);
}
.brand svg {
  width: 22px;
  height: 22px;
  display: block;
}

.nav-links {
  display: flex;
  gap: 0.25rem;
  flex-wrap: wrap;
}
.nav-links a {
  color: var(--muted);
  font-size: 0.92rem;
  padding: 0.4rem 0.65rem;
  border-radius: 8px;
  border: 1px solid transparent;
}
.nav-links a:hover {
  color: var(--ink);
  border-color: var(--line);
  border-bottom-color: var(--line);
}
.nav-links a[aria-current="page"],
.nav-links a.current {
  color: var(--accent);
}

/* ------------------------------------------------------------------ main */
main.page {
  flex: 1 1 auto;
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 2.5rem 1.25rem 3.5rem;
}

.eyebrow {
  display: block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.6rem;
}

h1 {
  font-size: clamp(1.9rem, 4.4vw, 2.7rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 0.9rem;
}
h1 .tint {
  color: var(--accent);
}

.lede {
  max-width: 62ch;
  color: var(--muted);
  font-size: 1.05rem;
  margin: 0 0 1.5rem;
}
.lede strong {
  color: var(--ink);
}

.answer {
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  background: var(--panel);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  margin: 0 0 1.5rem;
  font-size: 1.05rem;
}
.answer p {
  margin: 0;
}
.answer .ans-label {
  display: block;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--muted);
  margin-bottom: 0.4rem;
  font-weight: 600;
}
.answer strong {
  color: var(--ink);
}

/* ------------------------------------------------------------- prose / text */
.prose h2 {
  font-size: 1.35rem;
  letter-spacing: -0.01em;
  margin: 2rem 0 0.7rem;
  line-height: 1.3;
}
.prose h3 {
  font-size: 1.08rem;
  margin: 1.6rem 0 0.5rem;
}
.prose p {
  max-width: 66ch;
  margin: 0 0 1rem;
}
.prose ul,
.prose ol {
  max-width: 66ch;
  padding-left: 1.3rem;
  margin: 0 0 1rem;
}
.prose li {
  margin: 0.35rem 0;
}
.prose strong {
  color: var(--ink);
}
.prose code,
.prose kbd {
  font-family: var(--mono);
  font-size: 0.9em;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 0.08em 0.4em;
}
.prose table {
  font-size: 0.95rem;
}
.muted {
  color: var(--muted);
}
.small {
  font-size: 0.88rem;
}
.note {
  font-size: 0.85rem;
  color: var(--muted);
}
.term {
  color: var(--ink);
  font-weight: 600;
}
.qa p {
  margin: 0 0 1.4rem;
}

/* ------------------------------------------------------------------ cards */
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.4rem 1.5rem;
  margin: 0 0 1.25rem;
}
.card h2 {
  margin: 0 0 0.5rem;
  font-size: 1.25rem;
  letter-spacing: -0.01em;
}
.card > p {
  color: var(--muted);
  margin: 0 0 1rem;
  max-width: 66ch;
}
.card .card-hint {
  color: var(--muted);
}

/* form ---------------------------------------------------------------- */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem 1.25rem;
}
.field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
.field label,
.field .field-label {
  font-size: 0.84rem;
  color: var(--muted);
  font-weight: 500;
}
.field .hint {
  font-size: 0.74rem;
  color: var(--muted);
}
.field input[type="text"],
.field input[type="number"],
.field input[type="date"],
.field select {
  font: inherit;
  color: var(--ink);
  background: var(--bg);
  border: 1px solid var(--line-strong);
  border-radius: 9px;
  padding: 0.6rem 0.75rem;
  width: 100%;
}
.field input::placeholder {
  color: var(--muted);
}
.field input:focus,
.field select:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: transparent;
}
.field.inline-amount {
  flex-direction: row;
  align-items: baseline;
  gap: 0.6rem;
  flex-wrap: wrap;
}
.field .num {
  font-variant-numeric: tabular-nums;
}

.currency-row {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.currency-row label {
  font-size: 0.84rem;
  color: var(--muted);
}
.currency-row input[type="text"] {
  width: 6rem;
  font: inherit;
  color: var(--ink);
  background: var(--bg);
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  padding: 0.35rem 0.55rem;
}
.currency-row input[type="text"]:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

/* results / tables ------------------------------------------------------ */
.result-table-wrap {
  overflow-x: auto;
}
.tbl {
  width: 100%;
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
}
.tbl th,
.tbl td {
  text-align: left;
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
.tbl thead th {
  color: var(--muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
}
.tbl tbody tr:last-child th,
.tbl tbody tr:last-child td {
  border-bottom: 0;
}
.tbl td.num,
.tbl th.num {
  text-align: right;
  font-variant-numeric: tabular-nums;
}
.tbl .metric {
  color: var(--muted);
}
.tbl .metric strong {
  color: var(--ink);
  font-weight: 600;
}
.tbl .highlight-row td {
  background: rgba(94, 234, 212, 0.07);
  color: var(--ink);
}
.risk-hi {
  color: var(--danger);
  font-weight: 600;
}
.risk-lo {
  color: var(--accent);
  font-weight: 600;
}
.result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 0.9rem;
  margin: 0.5rem 0 1rem;
}
.stat {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.75rem 0.9rem;
  background: var(--bg);
}
.stat .stat-label {
  font-size: 0.74rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.stat .stat-value {
  font-size: 1.25rem;
  font-weight: 650;
  font-variant-numeric: tabular-nums;
  margin-top: 0.15rem;
  color: var(--ink);
}
.stat .stat-value small {
  font-size: 0.8rem;
  color: var(--muted);
  font-weight: 400;
}

/* formula -------------------------------------------------------------- */
.formula {
  border-left: 3px solid var(--line-strong);
  padding: 0.2rem 0 0.2rem 1rem;
  margin: 0.25rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
  max-width: 70ch;
}
.formula code {
  font-family: var(--mono);
  font-size: 0.92em;
  color: var(--ink);
}
.formula + .formula {
  margin-top: 0.5rem;
}

/* related / CTAs -------------------------------------------------------- */
.rel {
  border-top: 1px solid var(--line);
  margin-top: 2rem;
  padding-top: 1.4rem;
}
.rel h2 {
  font-size: 1.05rem;
  margin: 0 0 0.75rem;
}
.rel ul {
  list-style: none;
  margin: 0 0 1rem;
  padding: 0;
}
.rel li {
  margin: 0.4rem 0;
}
.rel li::before {
  content: "→";
  color: var(--accent);
  margin-right: 0.5rem;
}
.cta {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  padding: 1rem 1.2rem;
  margin-top: 0.6rem;
}
.cta p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--ink);
}
.cta .cta-link {
  font-weight: 600;
}

/* tools index ----------------------------------------------------------- */
.tool-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0 0;
}
.tool-card {
  display: block;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  padding: 1.1rem 1.2rem;
  color: var(--ink);
  transition: border-color 0.15s ease;
}
.tool-card:hover {
  border-color: var(--line-strong);
  border-bottom-color: var(--line-strong);
  color: var(--ink);
}
.tool-card h3 {
  margin: 0 0 0.35rem;
  font-size: 1.02rem;
  color: var(--ink);
}
.tool-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}
.tool-card .tag {
  color: var(--accent);
  font-size: 0.8rem;
}

/* footer ---------------------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--bg);
  width: 100%;
}
.site-footer .footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 1.5rem 1.25rem 2rem;
}
.site-footer .foot-line {
  margin: 0 0 0.6rem;
  color: var(--ink);
  font-size: 0.85rem;
}
.site-footer .foot-disclaimer {
  margin: 0;
  color: var(--muted);
  font-size: 0.76rem;
  line-height: 1.6;
  max-width: 80ch;
}

/* misc ------------------------------------------------------------------ */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: var(--bg);
  padding: 0.6rem 0.9rem;
  border-radius: 0 0 8px 0;
  font-weight: 600;
  z-index: 20;
}
.skip-link:focus {
  left: 0;
}
.tabular {
  font-variant-numeric: tabular-nums;
}

/* --------------------------------------------------------------- reduced */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}

/* --------------------------------------------------------------- responsive */
@media (max-width: 40rem) {
  main.page {
    padding-top: 1.8rem;
  }
  .site-nav {
    flex-direction: column;
    align-items: flex-start;
  }
  .nav-links {
    width: 100%;
  }
  .nav-links a {
    flex: 1 1 auto;
    text-align: center;
  }
  .card {
    padding: 1.1rem 1rem;
  }
}

/* ------------------------------------------------------------------ print */
@media print {
  body {
    background: #fff;
    color: #111;
    font-size: 11pt;
  }
  .site-header,
  .site-footer,
  .rel,
  .answer .ans-label {
    display: none;
  }
  main.page {
    max-width: none;
    padding: 0;
  }
  .card,
  .answer,
  .stat,
  .formula {
    background: #fff;
    border-color: #ccc;
    color: #111;
    break-inside: avoid;
  }
  a {
    color: #111;
  }
  .tbl th {
    color: #333;
  }
  .tbl td.num,
  .tbl th.num,
  .stat-value,
  .stat .stat-value {
    color: #111;
  }
  .stat .stat-label,
  .muted,
  .note,
  .card > p {
    color: #444;
  }
}

/* How-it-works / after-checkout step strips (landing + pricing) */
.how-heading {
  font-size: 1.05rem;
  margin: 1.25rem 0 0.5rem;
  color: var(--ink);
}

.how-steps {
  display: grid;
  gap: 0.35rem;
  margin: 0 0 1.25rem;
  padding-left: 1.25rem;
}

.how-steps li {
  color: var(--muted);
}

.how-steps li::marker {
  color: var(--accent);
  font-weight: 700;
}

.how-steps strong {
  color: var(--ink);
}

/* ------------------------------------------------------------------ blog */
.post-list {
  display: grid;
  gap: 1rem;
  margin: 1.5rem 0 0;
}

.post-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  padding: 1.2rem 1.35rem;
  transition: border-color 0.15s ease;
}

.post-card:hover {
  border-color: rgba(110, 168, 254, 0.35);
}

.post-card h2 {
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  margin: 0.2rem 0 0.45rem;
  line-height: 1.3;
}

.post-card h2 a {
  color: var(--ink);
}

.post-card h2 a:hover {
  color: var(--accent-strong, var(--accent));
  border-bottom-color: transparent;
}

.post-meta {
  font-size: 0.8rem;
  color: var(--muted);
  margin: 0;
  letter-spacing: 0.02em;
}

.post-meta time {
  color: var(--muted);
}

.tag {
  display: inline-block;
  margin-left: 0.5rem;
  padding: 0.1rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--accent);
}

.post-cta {
  border: 1px solid rgba(110, 168, 254, 0.3);
  border-radius: var(--radius);
  background: var(--panel);
  padding: 1.1rem 1.3rem;
  margin: 2.2rem 0 1.5rem;
}

.post-cta p {
  margin: 0 0 0.9rem;
  max-width: 66ch;
}

.post-cta-actions {
  display: flex;
  gap: 0.7rem;
  flex-wrap: wrap;
}

.post-cta-actions .button.primary {
  background: var(--accent);
  border-color: transparent;
  color: #071022;
  font-weight: 700;
}

.post-nav {
  border-top: 1px solid var(--line);
  margin-top: 2rem;
  padding-top: 1.2rem;
  font-size: 0.92rem;
}

.post-nav p {
  margin: 0 0 0.4rem;
  color: var(--muted);
}