/* Deal Snap REI — shared site styles */
:root {
  --bg: #fafaf9;
  --bg-elev: #ffffff;
  --ink: #0a0a0a;
  --ink-2: #404040;
  --ink-3: #737373;
  --ink-4: #a3a3a3;
  --line: #e7e5e4;
  --line-strong: #d6d3d1;
  --accent: #1a6b4a;
  --accent-ink: #0d3a28;
  --accent-soft: #ecfdf5;
  --positive: #16a34a;
  --negative: #dc2626;
  --neutral: #ca8a04;
  --radius: 10px;
  --radius-lg: 14px;
  --shadow-sm: 0 1px 2px rgba(10,10,10,.04), 0 1px 1px rgba(10,10,10,.03);
  --shadow-md: 0 4px 14px rgba(10,10,10,.06), 0 1px 3px rgba(10,10,10,.04);
  --shadow-lg: 0 24px 60px rgba(10,10,10,.10), 0 8px 20px rgba(10,10,10,.06);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  font-feature-settings: 'cv11', 'ss01', 'ss03';
  background: var(--bg);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  line-height: 1.5;
}
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.container-narrow { max-width: 960px; margin: 0 auto; padding: 0 24px; }

/* Nav */
nav.top {
  position: sticky; top: 0;
  background: rgba(250,250,249,.85);
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--line);
  z-index: 50;
}
.nav-row {
  display: flex; align-items: center; justify-content: space-between;
  height: 60px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 700; font-size: 15px; letter-spacing: -0.01em;
}
.brand-mark {
  width: 26px; height: 26px; background: var(--accent);
  border-radius: 7px; display: grid; place-items: center;
  color: #fff; font-weight: 800; font-size: 13px; letter-spacing: -0.04em;
}
.nav-links {
  display: flex; align-items: center; gap: 28px;
  font-size: 13.5px; color: var(--ink-2); font-weight: 500;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a.active { color: var(--ink); font-weight: 600; }
.nav-cta { display: flex; align-items: center; gap: 10px; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  height: 36px; padding: 0 14px; border-radius: 8px;
  font-size: 13.5px; font-weight: 600;
  transition: all .15s ease;
  border: 1px solid transparent; white-space: nowrap;
}
.btn-ghost { color: var(--ink-2); background: transparent; }
.btn-ghost:hover { color: var(--ink); background: rgba(0,0,0,.04); }
.btn-primary { background: var(--ink); color: #fff; border-color: var(--ink); }
.btn-primary:hover { background: #1a1a1a; }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: var(--accent-ink); }
.btn-outline { background: var(--bg-elev); color: var(--ink); border-color: var(--line-strong); }
.btn-outline:hover { border-color: var(--ink); }
.btn-lg { height: 44px; padding: 0 20px; font-size: 14.5px; border-radius: 10px; }

/* Page header */
.page-header {
  padding: 72px 0 40px;
  background:
    radial-gradient(1000px 500px at 50% -200px, rgba(26,107,74,.07), transparent 60%),
    var(--bg);
}
.page-eyebrow {
  font-size: 12.5px; text-transform: uppercase; letter-spacing: 0.14em;
  color: var(--accent); font-weight: 700; margin-bottom: 12px;
}
.page-h1 {
  font-size: clamp(32px, 4.5vw, 52px);
  line-height: 1.08; letter-spacing: -0.03em;
  font-weight: 700; max-width: 800px;
}
.page-sub {
  margin-top: 18px;
  font-size: clamp(15px, 1.2vw, 18px);
  color: var(--ink-2); max-width: 640px; line-height: 1.55;
}

/* Calculator layout */
.calc-wrap { padding: 20px 0 80px; }
.calc-grid {
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: 32px;
  align-items: start;
}
.calc-card {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}
.calc-section-title {
  font-size: 11px; text-transform: uppercase; letter-spacing: 0.12em;
  color: var(--accent); font-weight: 700; margin-bottom: 14px;
}
.calc-section + .calc-section { margin-top: 24px; padding-top: 22px; border-top: 1px solid var(--line); }

.field-row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 8px 0; gap: 16px;
}
.field-row label {
  font-size: 13.5px; color: var(--ink-2);
}
.field-row .field-unit {
  display: flex; align-items: center; gap: 4px;
}
.field-row input[type="number"], .field-row input[type="text"] {
  width: 120px; text-align: right;
  background: #fff; border: 1px solid var(--line);
  color: var(--ink); font: inherit;
  font-size: 13.5px; font-weight: 600;
  padding: 7px 10px; border-radius: 7px;
  font-feature-settings: 'tnum';
}
.field-row input:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(26,107,74,.12);
}
.field-row .unit-sym {
  font-size: 13px; color: var(--ink-3); font-weight: 500;
}

/* Results */
.result-card {
  background: linear-gradient(180deg, var(--bg-elev), #fafaf9);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 28px;
  position: sticky; top: 80px;
  box-shadow: var(--shadow-md);
}
.result-headline {
  text-align: center; padding: 14px 0 20px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 18px;
}
.result-headline-label {
  font-size: 11px; text-transform: uppercase; letter-spacing: 0.12em;
  color: var(--ink-3); font-weight: 700;
}
.result-headline-value {
  font-size: 40px; font-weight: 800;
  color: var(--accent); letter-spacing: -0.03em;
  margin-top: 6px; font-feature-settings: 'tnum';
}
.result-headline-sub {
  font-size: 12.5px; color: var(--ink-3); margin-top: 4px;
}
.result-row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 8px 0;
  font-size: 13.5px; color: var(--ink-2);
  font-feature-settings: 'tnum';
}
.result-row b { color: var(--ink); font-weight: 600; }
.result-row.pos b { color: var(--positive); }
.result-row.neg b { color: var(--negative); }
.result-row.emph {
  padding: 12px 0; font-weight: 700; color: var(--ink); font-size: 14px;
  border-top: 1px solid var(--line); margin-top: 6px;
}
.result-row.emph b { font-size: 16px; }

/* Toggle pill */
.toggle-pill {
  display: inline-flex;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 3px;
  background: #fff;
  font-size: 12.5px; font-weight: 600;
  user-select: none;
}
.toggle-pill button {
  padding: 6px 14px;
  border: 0; border-radius: 999px;
  background: transparent; color: var(--ink-3);
  font: inherit; cursor: pointer;
  transition: all .15s ease;
}
.toggle-pill button.on {
  background: var(--accent); color: #fff;
}

/* Footer */
footer {
  border-top: 1px solid var(--line);
  padding: 36px 0; text-align: center;
  font-size: 12.5px; color: var(--ink-3);
  margin-top: 80px;
}
footer a { color: var(--ink-2); }
footer a:hover { color: var(--ink); }

/* Responsive */
@media (max-width: 900px) {
  .calc-grid { grid-template-columns: 1fr; gap: 20px; }
  .result-card { position: static; }
  .nav-links { display: none; }
  .container, .container-narrow { padding: 0 16px; }
  .page-header { padding: 48px 0 28px; }
  .calc-wrap { padding: 12px 0 48px; }
  .calc-card, .result-card { padding: 20px; }
  .explainer { padding: 40px 0; }
  footer { margin-top: 48px; padding: 28px 0; }
  /* iOS will zoom on focus if input font-size < 16px */
  .field-row input[type="number"],
  .field-row input[type="text"] { font-size: 16px; }
}

@media (max-width: 560px) {
  .nav-row { height: 54px; }
  .brand { font-size: 14px; }
  .btn { height: 34px; padding: 0 12px; font-size: 13px; }
  .btn-lg { height: 42px; padding: 0 16px; font-size: 14px; }
  .page-h1 { font-size: 30px; }
  .page-sub { font-size: 15px; }
  .calc-card, .result-card { padding: 16px; border-radius: 12px; }
  .calc-section + .calc-section { margin-top: 18px; padding-top: 16px; }
  .field-row {
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
    padding: 10px 0;
  }
  .field-row label { font-size: 13px; }
  .field-row .field-unit { justify-content: flex-start; }
  .field-row input[type="number"],
  .field-row input[type="text"] {
    width: 100%;
    text-align: left;
    padding: 10px 12px;
  }
  .result-headline-value { font-size: 34px; }
  .formula { font-size: 12.5px; padding: 14px 16px; word-break: break-word; }
  .toggle-pill button { padding: 6px 12px; }
}

/* Explainer blocks */
.explainer { padding: 60px 0; }
.explainer-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
  margin-top: 40px;
}
.explainer-card {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 24px;
}
.explainer-card h3 {
  font-size: 15px; font-weight: 700; letter-spacing: -0.01em;
  margin-bottom: 8px;
}
.explainer-card p { font-size: 14px; color: var(--ink-2); line-height: 1.6; }
.explainer-card .num {
  display: inline-block;
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--accent-soft); color: var(--accent-ink);
  font-size: 13px; font-weight: 800; text-align: center; line-height: 28px;
  margin-bottom: 12px;
}
@media (max-width: 900px) { .explainer-grid { grid-template-columns: 1fr; } }

/* Formula block */
.formula {
  background: var(--accent-soft);
  border: 1px solid #a7f3d0;
  border-radius: var(--radius);
  padding: 16px 20px;
  margin-top: 20px;
  font-family: ui-monospace, 'SF Mono', Menlo, monospace;
  font-size: 13.5px; color: var(--accent-ink);
}