/* The-Calculators-Hub - clean blue & white theme */
:root {
  --blue: #1565c0;
  --blue-dark: #0d47a1;
  --blue-light: #e3f0fc;
  --blue-hover: #1976d2;
  --green: #2e7d32;
  --bg: #f5f7fa;
  --card: #ffffff;
  --border: #d9e1ec;
  --text: #1f2733;
  --muted: #5b6b7f;
  --shadow: 0 1px 3px rgba(16, 42, 76, 0.08);
  --radius: 8px;
}

* { box-sizing: border-box; }

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

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

a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; }

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 16px;
}

/* ---------- Header ---------- */
.site-header {
  background: linear-gradient(180deg, var(--blue) 0%, var(--blue-dark) 100%);
  color: #fff;
  box-shadow: var(--shadow);
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 14px 16px;
  flex-wrap: wrap;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  font-weight: 700;
  font-size: 22px;
  white-space: nowrap;
}
.logo:hover { text-decoration: none; }
.logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px; height: 36px;
  background: #fff;
  color: var(--blue-dark);
  border-radius: 8px;
  font-weight: 800;
  font-size: 20px;
}
.search-wrap {
  flex: 1 1 320px;
  position: relative;
  min-width: 220px;
}
.search-wrap input {
  width: 100%;
  padding: 11px 14px;
  border: none;
  border-radius: 22px;
  font-size: 15px;
  outline: none;
}
.search-results {
  position: absolute;
  top: 110%;
  left: 0; right: 0;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 6px 20px rgba(16, 42, 76, 0.18);
  max-height: 360px;
  overflow-y: auto;
  z-index: 50;
  display: none;
}
.search-results a {
  display: block;
  padding: 9px 14px;
  color: var(--text);
  border-bottom: 1px solid #f0f3f8;
}
.search-results a:hover { background: var(--blue-light); text-decoration: none; }
.search-results .sr-cat { font-size: 12px; color: var(--muted); }
.search-results .sr-empty { padding: 12px 14px; color: var(--muted); }

/* ---------- Nav ---------- */
.main-nav {
  background: var(--blue-dark);
}
.main-nav .container {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}
.main-nav a {
  color: #dceafff2;
  padding: 10px 14px;
  font-size: 14px;
  font-weight: 600;
}
.main-nav a:hover { background: rgba(255,255,255,.12); text-decoration: none; }

/* ---------- Sections ---------- */
main { padding: 24px 0 40px; }
.section { margin-bottom: 34px; }
.section-title {
  font-size: 20px;
  margin: 0 0 14px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--blue);
  color: var(--blue-dark);
}
.subtle { color: var(--muted); }

/* ---------- Grids ---------- */
.calc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 10px;
}
.calc-card {
  display: block;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 14px;
  color: var(--text);
  box-shadow: var(--shadow);
  transition: border-color .12s, transform .12s;
}
.calc-card:hover {
  border-color: var(--blue);
  text-decoration: none;
  transform: translateY(-2px);
}
.calc-card .ico { font-size: 20px; margin-bottom: 4px; }
.calc-card .name { font-weight: 600; font-size: 15px; }

.featured .calc-grid { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }
.featured .calc-card {
  background: linear-gradient(180deg, #ffffff 0%, var(--blue-light) 130%);
  border-color: #c4dbf3;
}

/* category column list */
.cat-list {
  columns: 3 240px;
  column-gap: 26px;
}
.cat-list a {
  display: block;
  padding: 4px 0;
  font-size: 14.5px;
  break-inside: avoid;
}

/* ---------- Calculator page ---------- */
.layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 28px;
  align-items: start;
}
.calc-panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px 24px;
}
.calc-panel h1 { margin: 0 0 4px; font-size: 24px; color: var(--blue-dark); }
.calc-desc { color: var(--muted); margin: 0 0 18px; }

.field-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}
.field-row label {
  flex: 0 0 200px;
  font-weight: 600;
  font-size: 14.5px;
}
.input-affix {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  background: #fff;
  flex: 1 1 160px;
  max-width: 280px;
}
.input-affix .affix {
  background: #eef3fa;
  padding: 9px 11px;
  color: var(--muted);
  font-size: 14px;
  border-right: 1px solid var(--border);
}
.input-affix .affix.suffix { border-right: none; border-left: 1px solid var(--border); }
.field-row input[type="number"],
.field-row input[type="text"],
.field-row input[type="email"],
.field-row input[type="date"],
.field-row input[type="time"],
.field-row select {
  flex: 1 1 auto;
  width: 100%;
  padding: 9px 11px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14.5px;
  font-family: inherit;
  outline: none;
}
.input-affix input, .input-affix select { border: none !important; border-radius: 0 !important; }
.field-row input:focus, .field-row select:focus { border-color: var(--blue); }
.field-help { flex-basis: 100%; font-size: 12.5px; color: var(--muted); margin-left: 212px; }

.btn-row { margin-top: 18px; display: flex; gap: 10px; flex-wrap: wrap; }
.btn {
  background: var(--blue);
  color: #fff;
  border: none;
  padding: 11px 22px;
  font-size: 15px;
  font-weight: 600;
  border-radius: 6px;
  cursor: pointer;
}
.btn:hover { background: var(--blue-hover); }
.btn.secondary { background: #eef3fa; color: var(--blue-dark); }
.btn.secondary:hover { background: #dfe9f6; }

.result {
  margin-top: 22px;
  border: 1px solid #cfe3d2;
  background: #f1f9f2;
  border-radius: var(--radius);
  padding: 18px 20px;
  display: none;
}
.result.show { display: block; }
.result.error { border-color: #f1c6c6; background: #fdf2f2; }
.result h3 { margin: 0 0 10px; color: var(--green); font-size: 17px; }
.result.error h3 { color: #c62828; }
.result .big {
  font-size: 30px;
  font-weight: 700;
  color: var(--blue-dark);
  margin-bottom: 6px;
}
.result-table { width: 100%; border-collapse: collapse; margin-top: 10px; }
.result-table th, .result-table td {
  text-align: left;
  padding: 7px 10px;
  border-bottom: 1px solid #e6eef7;
  font-size: 14px;
}
.result-table th { background: #eef3fa; color: var(--blue-dark); }
.result-table tr:nth-child(even) td { background: #fafcff; }

.note { font-size: 13px; color: var(--muted); margin-top: 14px; }

/* sidebar */
.sidebar h3 {
  font-size: 15px;
  color: var(--blue-dark);
  border-bottom: 2px solid var(--blue);
  padding-bottom: 6px;
}
.sidebar ul { list-style: none; padding: 0; margin: 0; }
.sidebar li a { display: block; padding: 5px 0; font-size: 14px; }

.breadcrumb { font-size: 13px; color: var(--muted); margin-bottom: 14px; }
.breadcrumb a { color: var(--muted); }

/* scientific calc */
.sci-display {
  background: #0d1b2a;
  color: #e8f1ff;
  border-radius: 8px;
  padding: 14px 16px;
  text-align: right;
  margin-bottom: 12px;
}
.sci-display .expr { min-height: 18px; font-size: 14px; color: #9fb6d4; word-break: break-all; }
.sci-display .out { font-size: 30px; font-weight: 700; word-break: break-all; }
.sci-keys {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
}
.sci-keys button {
  padding: 14px 0;
  font-size: 16px;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 6px;
  cursor: pointer;
  font-family: inherit;
}
.sci-keys button:hover { background: var(--blue-light); }
.sci-keys button.op { background: #eef3fa; color: var(--blue-dark); font-weight: 600; }
.sci-keys button.eq { background: var(--blue); color: #fff; font-weight: 700; }
.sci-keys button.eq:hover { background: var(--blue-hover); }
.sci-keys button.fn { font-size: 13.5px; color: var(--blue-dark); }
.sci-keys button.clr { background: #fdeaea; color: #c62828; }

/* generic content pages */
.content-page {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 26px 30px;
}
.content-page h1 { color: var(--blue-dark); margin-top: 0; }
.content-page h2 { color: var(--blue-dark); font-size: 19px; margin-top: 26px; }
.content-page p, .content-page li { color: #2c3744; }

.sitemap-cat { margin-bottom: 26px; }
.sitemap-cat h2 { border-bottom: 2px solid var(--blue); padding-bottom: 6px; }
.sitemap-list { columns: 3 230px; column-gap: 26px; list-style: none; padding: 0; }
.sitemap-list li { padding: 3px 0; break-inside: avoid; }

/* ---------- Footer ---------- */
.site-footer {
  background: #0d1b2a;
  color: #c7d4e4;
  padding: 34px 0 20px;
  margin-top: 30px;
  font-size: 14px;
}
.footer-cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 24px;
}
.footer-cols h4 { color: #fff; margin: 0 0 10px; font-size: 15px; }
.footer-cols a { color: #aebfd6; display: block; padding: 3px 0; }
.footer-cols a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid #25364b;
  margin-top: 24px;
  padding-top: 16px;
  text-align: center;
  color: #8295ad;
  font-size: 13px;
}
.footer-bottom p {
  margin: 4px 0;
}
.footer-bottom small {
  display: block;
  font-size: 11px;
  color: #647b94;
  margin-top: 8px;
}

/* ---------- Ads & cookie consent ---------- */
.ad-label {
  display: block;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--muted);
  text-align: center;
  margin: 18px 0 4px;
}
.ad-unit { display: none; text-align: center; margin: 16px 0; min-height: 1px; }

.ch-consent {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  background: #0d1b2a;
  color: #dce7f5;
  padding: 14px 16px;
  z-index: 9999;
  box-shadow: 0 -2px 14px rgba(0, 0, 0, .28);
  font-size: 14px;
}
.ch-consent .inner {
  max-width: 1180px;
  margin: 0 auto;
  display: flex;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
}
.ch-consent p { margin: 0; flex: 1 1 340px; }
.ch-consent a { color: #9fc2ef; }
.ch-consent .btns { display: flex; gap: 8px; }
.ch-consent button {
  border: none;
  border-radius: 6px;
  padding: 9px 18px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  font-size: 14px;
}
.ch-consent .accept { background: var(--blue); color: #fff; }
.ch-consent .accept:hover { background: var(--blue-hover); }
.ch-consent .reject { background: #33455c; color: #dce7f5; }
.ch-consent .reject:hover { background: #3f536e; }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { order: 2; }
}
@media (max-width: 560px) {
  .header-inner { gap: 10px; }
  .logo { font-size: 19px; }
  .field-row label { flex-basis: 100%; }
  .field-help { margin-left: 0; }
  .cat-list { columns: 1; }
  .sitemap-list { columns: 1; }
}