/* ==========================================================================
   WATER-SIZER — STYLES (clean, light, trustworthy. No legacy affiliate theme.)
   ========================================================================== */
:root {
  --bg: #f6f9fb;
  --surface: #ffffff;
  --ink: #0f2330;
  --ink-soft: #4a6373;
  --line: #e2ebf0;
  --brand: #0a7ea4;
  --brand-dark: #086687;
  --brand-tint: #e6f4f9;
  --accent: #14a37f;
  --warn-bg: #fff6e6;
  --warn-line: #f0c469;
  --warn-ink: #8a5a00;
  --radius: 14px;
  --shadow: 0 1px 3px rgba(15, 35, 48, .06), 0 8px 24px rgba(15, 35, 48, .06);
  --maxw: 760px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}
a { color: var(--brand-dark); }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* Header / footer ---------------------------------------------------------- */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}
.site-header .container { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { font-weight: 800; font-size: 1.15rem; color: var(--ink); text-decoration: none; letter-spacing: -.02em; }
.brand .drop { color: var(--brand); }
.brand-tag { color: var(--ink-soft); font-size: .82rem; }

.site-footer {
  margin-top: 56px;
  padding: 28px 0 40px;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: .85rem;
  background: var(--surface);
}
.site-footer .disclosure { margin: 0 0 10px; }

/* Hero --------------------------------------------------------------------- */
.hero { padding: 40px 0 8px; }
.hero h1 { font-size: 1.9rem; line-height: 1.2; letter-spacing: -.025em; margin: 0 0 12px; }
.hero .lede { font-size: 1.08rem; color: var(--ink-soft); margin: 0; }
.eyebrow {
  display: inline-block; font-size: .72rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: .08em; color: var(--brand-dark); background: var(--brand-tint);
  padding: 4px 10px; border-radius: 999px; margin-bottom: 14px;
}

/* Calculator card ---------------------------------------------------------- */
.calc {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px;
  margin: 22px 0;
}
.calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 560px) { .calc-grid { grid-template-columns: 1fr; } }

.field { display: flex; flex-direction: column; }
.field label { font-weight: 600; font-size: .92rem; margin-bottom: 4px; }
.field .unit { color: var(--ink-soft); font-weight: 400; }
.field-hint { margin: 0 0 8px; font-size: .8rem; color: var(--ink-soft); }
.field input, .field select {
  font: inherit; padding: 11px 12px; border: 1px solid var(--line); border-radius: 10px;
  background: #fff; color: var(--ink); width: 100%;
}
.field input:focus, .field select:focus { outline: 2px solid var(--brand); border-color: var(--brand); }

.calc-result { margin-top: 22px; }

/* Answer card -------------------------------------------------------------- */
.answer-card {
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-dark) 100%);
  color: #fff; border-radius: var(--radius); padding: 22px 24px; margin-bottom: 16px;
}
.answer-eyebrow { font-size: .72rem; text-transform: uppercase; letter-spacing: .08em; opacity: .85; }
.answer-headline { font-size: 1.7rem; font-weight: 800; line-height: 1.15; margin: 4px 0 8px; letter-spacing: -.02em; }
.answer-sub { margin: 0; opacity: .95; font-size: .96rem; }

/* Breakdown table ---------------------------------------------------------- */
.breakdown { width: 100%; border-collapse: collapse; margin: 8px 0 4px; font-size: .92rem; }
.breakdown th, .breakdown td { text-align: left; padding: 10px 4px; border-bottom: 1px solid var(--line); }
.breakdown th { font-weight: 500; color: var(--ink-soft); }
.breakdown td { text-align: right; font-weight: 700; font-variant-numeric: tabular-nums; }

/* Callout ------------------------------------------------------------------ */
.callout { border-radius: 10px; padding: 12px 14px; margin: 14px 0; font-size: .9rem; }
.callout-warn { background: var(--warn-bg); border: 1px solid var(--warn-line); color: var(--warn-ink); }
.callout-info { background: #eef6fb; border: 1px solid #bfe0f0; color: #0a5a78; }

/* Product card ------------------------------------------------------------- */
.product-card { border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; margin-top: 18px; }
.product-head { display: flex; gap: 12px; align-items: center; }
.product-emoji { font-size: 1.6rem; }
.product-card h3 { margin: 0; font-size: 1.05rem; }
.product-spec { margin: 2px 0 0; color: var(--ink-soft); font-size: .85rem; }
.product-desc { font-size: .92rem; color: var(--ink-soft); }
.product-meta { margin: 6px 0 12px; }
.product-price { font-weight: 700; }
.cta-row { display: flex; flex-wrap: wrap; gap: 10px; }

.btn {
  display: inline-block; font: inherit; font-weight: 600; text-decoration: none; cursor: pointer;
  padding: 11px 18px; border-radius: 10px; border: 1px solid transparent; text-align: center;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { filter: brightness(1.05); }
.btn-secondary { background: #fff; color: var(--brand-dark); border-color: var(--line); }
.btn-secondary:hover { background: var(--brand-tint); }

/* How-it-works details ----------------------------------------------------- */
.how { margin-top: 16px; font-size: .9rem; }
.how summary { cursor: pointer; font-weight: 600; color: var(--brand-dark); }
.how p { color: var(--ink-soft); }

/* Content sections --------------------------------------------------------- */
.section { margin: 36px 0; }
.section h2 { font-size: 1.3rem; letter-spacing: -.02em; margin: 0 0 12px; }
.faq-item { border-bottom: 1px solid var(--line); padding: 14px 0; }
.faq-item h3 { margin: 0 0 6px; font-size: 1.02rem; }
.faq-item p { margin: 0; color: var(--ink-soft); }

.related { display: flex; flex-wrap: wrap; gap: 8px; }
.related a {
  font-size: .86rem; text-decoration: none; color: var(--brand-dark);
  background: var(--brand-tint); padding: 7px 12px; border-radius: 999px;
}
.related a:hover { background: #d6ecf4; }

/* Hub / index -------------------------------------------------------------- */
.hub-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
.hub-card { display: block; text-decoration: none; color: var(--ink); border: 1px solid var(--line);
  border-radius: 12px; padding: 14px 16px; background: var(--surface); }
.hub-card:hover { border-color: var(--brand); }
.hub-card strong { display: block; }
.hub-card span { color: var(--ink-soft); font-size: .85rem; }