/* Shared styles for /tools/ — palette and typography match the rendered
   /qbank/, /help/ and /keywords/ pages (scripts/render-*-pages.py). */

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

html, body {
  margin: 0;
  padding: 0;
  font-family: 'Quicksand', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: #3f5870;
  background: linear-gradient(180deg, #eef4fa 0%, #f8fbfe 100%);
  -webkit-font-smoothing: antialiased;
  line-height: 1.65;
}

a { color: #527da0; text-decoration: none; }
a:hover { color: #2d5478; text-decoration: underline; }

header {
  padding: 1.5rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(110, 140, 170, 0.15);
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(6px);
  position: sticky;
  top: 0;
  z-index: 10;
}

header .brand { font-weight: 600; font-size: 1.05rem; color: #527da0; }
header nav a { margin-left: 1.5rem; font-weight: 400; font-size: 0.92rem; color: #6f8caa; }

.wrap {
  max-width: 820px;
  margin: 0 auto;
  padding: 2rem 1.5rem 5rem;
}

h1 {
  font-weight: 300;
  font-size: clamp(1.9rem, 4.5vw, 2.4rem);
  color: #527da0;
  margin: 0 0 0.75rem;
  letter-spacing: -0.01em;
}

h2 {
  font-weight: 500;
  font-size: 1.3rem;
  color: #3f5870;
  margin-top: 2.2rem;
  margin-bottom: 0.6rem;
}

h3 {
  font-weight: 500;
  font-size: 1.05rem;
  color: #4a6383;
  margin-top: 1.8rem;
  margin-bottom: 0.5rem;
}

p { margin: 0.6rem 0; }
.lede { font-size: 1.05rem; color: #4a6383; }
ul, ol { padding-left: 1.4rem; margin: 0.5rem 0 1rem; }
li { margin-bottom: 0.35rem; }
strong { color: #2d4d6e; font-weight: 600; }
hr { border: none; border-top: 1px solid rgba(110, 140, 170, 0.2); margin: 2.5rem 0; }

/* ---------- Disclaimer ---------- */

.disclaimer {
  margin: 1.25rem 0 2rem;
  padding: 0.85rem 1.1rem;
  border-left: 3px solid #a05a3a;
  background: rgba(160, 90, 58, 0.07);
  border-radius: 4px;
  font-size: 0.88rem;
  color: #6b4a38;
}
.disclaimer strong { color: #8a4a2c; }

.ack-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(45, 77, 110, 0.45);
  backdrop-filter: blur(3px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
}
.ack-backdrop[hidden] { display: none; }

.ack-card {
  background: #fff;
  border-radius: 14px;
  max-width: 540px;
  width: 100%;
  padding: 1.75rem;
  box-shadow: 0 18px 48px rgba(45, 77, 110, 0.25);
  max-height: 90vh;
  overflow-y: auto;
}
.ack-card h2 { margin-top: 0; color: #527da0; }
.ack-card p { font-size: 0.92rem; }
.ack-card .ack-btn {
  margin-top: 1.25rem;
  width: 100%;
  background: #527da0;
  color: #fff;
  border: none;
  border-radius: 10px;
  padding: 0.85rem 1.5rem;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
}
.ack-card .ack-btn:hover { background: #2d5478; }

/* ---------- Form controls ---------- */

.card {
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(110, 140, 170, 0.18);
  border-radius: 12px;
  padding: 1.25rem 1.35rem;
  margin: 1.25rem 0;
}

.field { margin-bottom: 1rem; }
.field:last-child { margin-bottom: 0; }

label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: #8aa3bc;
  margin-bottom: 0.35rem;
}

.hint {
  font-size: 0.82rem;
  color: #8aa3bc;
  margin-top: 0.3rem;
  text-transform: none;
  letter-spacing: 0;
  font-weight: 400;
}

input[type="number"], input[type="text"], select {
  width: 100%;
  font-family: inherit;
  font-size: 1rem;
  color: #3f5870;
  padding: 0.6rem 0.8rem;
  border: 1px solid rgba(110, 140, 170, 0.3);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.9);
  -webkit-appearance: none;
  appearance: none;
}
select {
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%236f8caa' stroke-width='2'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right 0.6rem center;
  background-size: 1.1em;
  padding-right: 2.2rem;
}
input:focus, select:focus { outline: none; border-color: #527da0; box-shadow: 0 0 0 3px rgba(82, 125, 160, 0.15); }

.row { display: flex; gap: 0.75rem; align-items: flex-end; flex-wrap: wrap; }
.row > .field { flex: 1 1 140px; margin-bottom: 0; }

.unit-toggle { display: inline-flex; border: 1px solid rgba(110, 140, 170, 0.3); border-radius: 8px; overflow: hidden; }
.unit-toggle button {
  font-family: inherit;
  font-size: 0.9rem;
  padding: 0.6rem 0.9rem;
  border: none;
  background: rgba(255, 255, 255, 0.9);
  color: #6f8caa;
  cursor: pointer;
}
.unit-toggle button[aria-pressed="true"] { background: #527da0; color: #fff; font-weight: 500; }

.checkline { display: flex; align-items: center; gap: 0.5rem; font-size: 0.92rem; color: #4a6383; }
.checkline input[type="checkbox"] { width: 1.05rem; height: 1.05rem; accent-color: #527da0; }
.checkline label { margin: 0; text-transform: none; letter-spacing: 0; font-size: 0.92rem; font-weight: 400; color: #4a6383; }

button.action {
  font-family: inherit;
  font-size: 0.92rem;
  font-weight: 500;
  padding: 0.6rem 1.1rem;
  border-radius: 8px;
  border: 1px solid rgba(82, 125, 160, 0.35);
  background: rgba(255, 255, 255, 0.9);
  color: #527da0;
  cursor: pointer;
}
button.action:hover { background: rgba(82, 125, 160, 0.1); }
button.action.primary { background: #527da0; color: #fff; border-color: #527da0; }
button.action.primary:hover { background: #2d5478; }

/* ---------- Results ---------- */

.result {
  background: rgba(82, 125, 160, 0.07);
  border: 1px solid rgba(82, 125, 160, 0.22);
  border-radius: 12px;
  padding: 1.25rem 1.35rem;
  margin: 1.5rem 0;
}
.result[hidden] { display: none; }

.result-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 1rem; }

.metric { padding: 0.75rem 0; }
.metric .metric-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #8aa3bc;
}
.metric .metric-value { font-size: 1.75rem; font-weight: 300; color: #2d5478; line-height: 1.2; }
.metric .metric-value .unit { font-size: 0.95rem; color: #6f8caa; margin-left: 0.2rem; }
.metric .metric-note { font-size: 0.8rem; color: #8aa3bc; margin-top: 0.2rem; }

.formula {
  font-size: 0.82rem;
  color: #8aa3bc;
  margin-top: 0.35rem;
  font-family: 'SF Mono', 'Menlo', monospace;
}

.errors { color: #a0453a; font-size: 0.9rem; margin: 0.75rem 0 0; }
.errors[hidden] { display: none; }
.errors ul { margin: 0.3rem 0 0; padding-left: 1.2rem; }

.calc-actions { margin: 1.4rem 0 0; }

.unit-advice {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.7rem;
  margin: 0.85rem 0 0;
  padding: 0.7rem 0.85rem;
  border-radius: 8px;
  background: rgba(176, 137, 62, 0.1);
  border: 1px solid rgba(176, 137, 62, 0.3);
  font-size: 0.88rem;
  color: #7a5a24;
}
.unit-advice[hidden] { display: none; }
.unit-advice button.action { padding: 0.35rem 0.7rem; font-size: 0.84rem; white-space: nowrap; }

#resultPending[hidden], #resultBody[hidden] { display: none; }

/* ---------- Data tables ---------- */

table { border-collapse: collapse; width: 100%; font-size: 0.9rem; margin: 1rem 0; }
th, td { text-align: left; padding: 0.5rem 0.6rem; border-bottom: 1px solid rgba(110, 140, 170, 0.18); }
th { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.05em; color: #8aa3bc; font-weight: 600; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }

.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }

/* ---------- Gauge ---------- */

.gauge { margin-top: 1rem; }
.gauge-track {
  position: relative;
  height: 14px;
  border-radius: 7px;
  background: rgba(110, 140, 170, 0.18);
  overflow: hidden;
}
.gauge-fill { height: 100%; width: 0; border-radius: 7px; transition: width 0.18s ease-out; background: #4a8c6a; }
.gauge-fill.warn { background: #c08a3e; }
.gauge-fill.over { background: #a0453a; }
.gauge-caption { font-size: 0.85rem; margin-top: 0.45rem; color: #4a6383; }
.gauge-caption.warn { color: #8a5f24; }
.gauge-caption.over { color: #8f3a30; font-weight: 600; }

/* ---------- Tool index cards ---------- */

.tool-list { list-style: none; padding: 0; margin: 1.5rem 0 0; }
.tool-list li { margin-bottom: 1rem; }
.tool-list a {
  display: block;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(110, 140, 170, 0.18);
  border-radius: 12px;
  padding: 1.1rem 1.3rem;
  transition: border-color 0.15s, background 0.15s;
}
.tool-list a:hover { text-decoration: none; border-color: rgba(82, 125, 160, 0.45); background: rgba(255, 255, 255, 0.92); }
.tool-list .tool-name { font-size: 1.1rem; font-weight: 500; color: #527da0; }
.tool-list .tool-desc { font-size: 0.9rem; color: #6f8caa; margin-top: 0.2rem; }

/* ---------- Footer ---------- */

footer {
  max-width: 820px;
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
  font-size: 0.85rem;
  color: #8aa3bc;
  border-top: 1px solid rgba(110, 140, 170, 0.15);
  text-align: center;
}
footer a { color: #6f8caa; }

@media (max-width: 800px) {
  header { padding: 1rem 1.25rem; }
  header nav a { margin-left: 1rem; font-size: 0.85rem; }
  .wrap { padding: 1.5rem 1.1rem 4rem; }
}

@media (max-width: 520px) {
  header { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
  header nav a { margin-left: 0; margin-right: 1rem; }
}