/* Concrete Calculator — mobile-first, solid colors, no external assets */

:root {
  --ink: #22262a;
  --slate: #525c66;
  --bg: #f3f1ec;
  --card: #ffffff;
  --line: #ddd7cb;
  --accent: #e85d04;
  --accent-dark: #c24e02;
  --accent-bright: #ff8a3d;
  --dark: #22262a;
  --dark-cell: #2e3339;
  --radius: 10px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.55;
  font-size: 16px;
}

.wrap {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 16px;
}

/* ---------- Header ---------- */
.site-header {
  background: var(--dark);
  color: #fff;
  border-bottom: 4px solid var(--accent);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 12px;
  padding-bottom: 12px;
}
.brand {
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: 0.2px;
}
.brand span { color: var(--accent-bright); }
.top-nav a {
  color: #e8e6e1;
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 600;
  margin-left: 16px;
}
.top-nav a:hover { color: var(--accent-bright); }

/* ---------- Cards & type ---------- */
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  margin: 20px 0;
}
h1 {
  font-size: 1.9rem;
  line-height: 1.15;
  margin: 0 0 8px;
}
h2 { font-size: 1.35rem; margin: 0 0 10px; }
.lede { color: var(--slate); margin: 0 0 16px; font-size: 1.05rem; }
.hint, .note { color: var(--slate); font-size: 0.92rem; }
.note { margin: 12px 0 0; }

/* ---------- Ad / affiliate placeholders ---------- */
.ad-slot, .affiliate-slot {
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  min-height: 0;
  margin: 14px 0;
}
.ad-slot { padding: 10px; }

/* ---------- Shape picker ---------- */
.shape-fieldset { border: none; margin: 0 0 16px; padding: 0; }
.shape-fieldset legend {
  font-weight: 700;
  margin-bottom: 8px;
  padding: 0;
}
.shape-picker { display: flex; flex-wrap: wrap; gap: 8px; }
.shape-picker label { cursor: pointer; }
.shape-picker input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}
.shape-picker span {
  display: inline-block;
  padding: 10px 18px;
  border: 2px solid var(--ink);
  border-radius: 999px;
  font-weight: 700;
  background: #fff;
  color: var(--ink);
}
.shape-picker input:checked + span {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.shape-picker input:focus-visible + span {
  outline: 3px solid var(--accent-bright);
  outline-offset: 2px;
}

/* ---------- Input fields ---------- */
.fields {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.fields[hidden] { display: none; }
.field label {
  display: block;
  font-weight: 600;
  font-size: 0.92rem;
  margin-bottom: 4px;
}
.field input, .field select {
  width: 100%;
  padding: 11px 12px;
  font-size: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
}
.field input:focus, .field select:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: var(--accent);
}

.waste-row { margin-top: 18px; }
.waste-row label { font-weight: 600; }
.waste-row input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
  margin: 8px 0 4px;
}

/* ---------- Results ---------- */
.results {
  background: var(--dark);
  color: #fff;
  border-radius: var(--radius);
  padding: 20px;
  margin-top: 20px;
}
.result-main {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  text-align: center;
}
.result-cell {
  background: var(--dark-cell);
  border-radius: 8px;
  padding: 14px 8px;
}
.result-num {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent-bright);
  line-height: 1.1;
}
.result-label {
  display: block;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: #cfd3d8;
  margin-top: 4px;
}
.result-note { color: #cfd3d8; font-size: 0.92rem; margin: 14px 0 0; }
.bags-heading { color: #fff; margin: 18px 0 10px; font-size: 1.1rem; }
.bag-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.bag-cell {
  background: var(--dark-cell);
  border-radius: 8px;
  padding: 12px 8px;
  text-align: center;
}
.bag-num {
  display: block;
  font-size: 1.6rem;
  font-weight: 800;
  color: #fff;
}
.bag-label { font-size: 0.85rem; color: #cfd3d8; }
.results .affiliate-slot { border-color: #454c54; }

/* ---------- Cost module ---------- */
.cost-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 16px;
}
.cost-cell {
  border: 2px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
}
.cost-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--slate);
}
.cost-num {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  margin: 4px 0;
}
.cost-detail { display: block; color: var(--slate); font-size: 0.9rem; }
.verdict {
  margin: 16px 0 0;
  padding: 14px 16px;
  border-left: 6px solid var(--slate);
  background: #faf8f4;
  border-radius: 6px;
  font-size: 1.15rem;
  font-weight: 800;
}
.verdict-bags { border-left-color: var(--accent); }
.verdict-ready { border-left-color: #2e7d32; }

/* ---------- Tables ---------- */
.table-wrap { overflow-x: auto; }
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}
th, td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
thead th {
  background: var(--dark);
  color: #fff;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
tbody tr:nth-child(even) { background: #faf8f4; }
td:nth-child(3), td:nth-child(4) { font-weight: 700; }

/* ---------- How-to / formula ---------- */
.steps { padding-left: 22px; }
.steps li { margin-bottom: 6px; }
.formula {
  background: #faf8f4;
  border: 1px solid var(--line);
  border-left: 6px solid var(--accent);
  border-radius: 6px;
  padding: 12px 16px;
  font-weight: 700;
  overflow-x: auto;
  white-space: nowrap;
}

/* ---------- FAQ ---------- */
details {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 16px;
  margin-bottom: 10px;
  background: #fff;
}
summary {
  font-weight: 700;
  cursor: pointer;
}
details p { margin: 10px 0 2px; color: var(--slate); }
details p strong { color: var(--ink); }

/* ---------- Disclaimer & footer ---------- */
.disclaimer {
  color: var(--slate);
  font-size: 0.92rem;
  margin: 20px 0;
}
.disclaimer h2 { font-size: 1.05rem; color: var(--ink); }
.site-footer {
  background: var(--dark);
  color: #cfd3d8;
  margin-top: 28px;
  padding: 18px 0;
  font-size: 0.92rem;
}

/* ---------- Wider screens ---------- */
@media (min-width: 640px) {
  .fields { grid-template-columns: repeat(4, 1fr); }
  .fields-3 { grid-template-columns: repeat(3, 1fr); }
  .result-main { grid-template-columns: repeat(3, 1fr); }
  .bag-grid { grid-template-columns: repeat(4, 1fr); }
  .cost-grid { grid-template-columns: 1fr 1fr; }
  h1 { font-size: 2.3rem; }
  .card { padding: 26px; }
}