/* ============================================================
   tools.css — statistics calculators page (/strumenti)
   Inherits variables and base rules from style.css
   ============================================================ */

.tools-hero { padding: clamp(56px,7vw,90px) 0 clamp(30px,4vw,44px); }
.tools-hero h1 {
  font-family: var(--serif); font-weight: 460;
  font-size: clamp(34px,5.5vw,54px); letter-spacing: -0.02em; line-height: 1.05; margin: 14px 0 0;
}
.tools-hero .lede { color: var(--ink-soft); max-width: 62ch; margin: 16px 0 0; }
.disclaimer {
  margin-top: 22px; padding: 14px 18px; border-radius: 12px;
  background: color-mix(in srgb, var(--accent) 9%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 24%, transparent);
  color: var(--ink-soft); font-size: 14px; max-width: 70ch;
}
.disclaimer strong { color: var(--ink); }

/* calculator card */
.calc {
  background: var(--surface); border: 1px solid var(--line-soft);
  border-radius: var(--radius); box-shadow: var(--shadow);
  padding: clamp(20px,3vw,30px); margin-bottom: 26px;
}
.calc > h2 {
  font-family: var(--serif); font-weight: 500; font-size: clamp(21px,2.6vw,27px);
  letter-spacing: -0.01em; margin: 0 0 4px;
}
.calc .sub { color: var(--muted); font-size: 14.5px; margin: 0 0 20px; }

/* segmented pills */
.seg { display: inline-flex; flex-wrap: wrap; gap: 6px; background: var(--surface-2);
  border: 1px solid var(--line-soft); border-radius: 11px; padding: 5px; margin: 0 0 6px; }
.seg button {
  font: 500 13.5px var(--sans); color: var(--ink-soft); background: transparent;
  border: 0; border-radius: 8px; padding: 7px 14px; cursor: pointer; transition: all .15s;
}
.seg button[aria-pressed="true"] { background: var(--accent); color: #fff; }
html[data-theme="dark"] .seg button[aria-pressed="true"] { color: #0f1115; }

.field-row { display: flex; flex-wrap: wrap; gap: 8px 10px; align-items: flex-end; margin-top: 14px; }
.field { display: flex; flex-direction: column; gap: 5px; }
.field label { font: 500 12px var(--mono); letter-spacing: .04em; color: var(--muted); text-transform: uppercase; }
.field input[type="number"], .field input[type="text"], .field select {
  font: 500 15px var(--sans); color: var(--ink); background: var(--bg);
  border: 1px solid var(--line); border-radius: 9px; padding: 9px 11px; width: 118px;
}
.field.wide input { width: 100%; }
.field input:focus, .field select:focus, textarea:focus { outline: 2px solid color-mix(in srgb, var(--accent) 45%, transparent); outline-offset: 1px; border-color: var(--accent); }

textarea.data {
  width: 100%; min-height: 90px; resize: vertical; font: 500 13.5px var(--mono);
  color: var(--ink); background: var(--bg); border: 1px solid var(--line);
  border-radius: 10px; padding: 11px; margin-top: 6px;
}
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 620px){ .grid2 { grid-template-columns: 1fr; } }

.opt-row { display: flex; flex-wrap: wrap; gap: 16px 20px; align-items: center; margin-top: 16px; }
.check { display: inline-flex; align-items: center; gap: 8px; font-size: 14px; color: var(--ink-soft); cursor: pointer; }

.btn-calc {
  margin-top: 18px; font: 600 15px var(--sans); color: #fff; background: var(--accent);
  border: 0; border-radius: 11px; padding: 12px 22px; cursor: pointer; transition: background .2s;
}
html[data-theme="dark"] .btn-calc { color: #0f1115; }
.btn-calc:hover { background: var(--accent-ink); }

/* results */
.result { margin-top: 20px; border-top: 1px solid var(--line-soft); padding-top: 18px; display: none; }
.result.show { display: block; }
.result .headline {
  font-family: var(--serif); font-size: 20px; margin: 0 0 14px; color: var(--ink);
}
.result .headline .p { color: var(--accent-ink); }
.stat-grid { display: flex; flex-wrap: wrap; gap: 10px; }
.stat {
  background: var(--surface-2); border: 1px solid var(--line-soft); border-radius: 10px;
  padding: 11px 14px; min-width: 96px;
}
.stat .k { font: 600 10.5px var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.stat .v { font-family: var(--serif); font-size: 20px; color: var(--ink); margin-top: 3px; }
.np-block { margin-top: 16px; padding: 14px; border-radius: 10px; background: var(--surface-2); border: 1px solid var(--line-soft); }
.np-block h4 { font: 600 12px var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--accent); margin: 0 0 10px; }
.err { color: var(--accent-2); font-size: 14px; margin-top: 12px; }
.hint { color: var(--muted); font-size: 13px; margin-top: 8px; }

table.res { width: 100%; border-collapse: collapse; margin-top: 14px; font-size: 14px; }
table.res th, table.res td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--line-soft); }
table.res th { font: 600 11px var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
table.res td.num { font-family: var(--mono); text-align: right; }

canvas.chart { width: 100%; max-width: 560px; height: auto; margin-top: 16px; display: block; }
.hide { display: none !important; }

.btn-ghost {
  font: 600 13.5px var(--sans); color: var(--accent-ink);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
  border-radius: 9px; padding: 8px 14px; cursor: pointer; transition: background .2s;
}
.btn-ghost:hover { background: color-mix(in srgb, var(--accent) 20%, transparent); }
.table-wrap { max-height: 360px; overflow: auto; border: 1px solid var(--line-soft); border-radius: 10px; }
.table-wrap table.res { margin-top: 0; }
.table-wrap thead th { position: sticky; top: 0; background: var(--surface); }

/* tabs */
.tabbar {
  display: flex; gap: 6px; margin-bottom: 24px; overflow-x: auto;
  border-bottom: 1px solid var(--line); padding-bottom: 0;
}
.tabbar button {
  font: 550 14.5px var(--sans); color: var(--ink-soft); background: transparent;
  border: 0; border-bottom: 2px solid transparent; padding: 11px 16px; cursor: pointer;
  white-space: nowrap; transition: color .15s, border-color .15s; margin-bottom: -1px;
}
.tabbar button:hover { color: var(--ink); }
.tabbar button[aria-pressed="true"] { color: var(--accent-ink); border-bottom-color: var(--accent); }
.tabpanel { animation: fadein .25s ease; }
@keyframes fadein { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* one-line theory callout */
.theory {
  margin: 0 0 22px; padding: 11px 15px; font-size: 14px; line-height: 1.5;
  color: var(--ink-soft); background: color-mix(in srgb, var(--accent) 7%, transparent);
  border-left: 3px solid var(--accent); border-radius: 0 8px 8px 0;
}
.theory strong { color: var(--ink); }

/* textarea label */
.tlabel { display: block; font: 500 12px var(--mono); letter-spacing: .04em; color: var(--muted); text-transform: uppercase; margin-bottom: 4px; }
.tlabel textarea { text-transform: none; }

/* 2x2 matrix input */
.matrix2 { display: grid; grid-template-columns: repeat(2, 92px); gap: 8px; margin: 8px 0 4px; }
.matrix2 input {
  font: 600 17px var(--mono); color: var(--ink); background: var(--bg);
  border: 1px solid var(--line); border-radius: 9px; padding: 12px; text-align: center; width: 92px;
}
.matrix2 input:focus { outline: 2px solid color-mix(in srgb, var(--accent) 45%, transparent); border-color: var(--accent); }