/*
Theme Name: Dot Product Calculator MTC
Theme URI: https://dotproductcalculator.com
Author: Marketing the Change
Author URI: https://marketingthechange.com
Description: Custom FSE block theme for dotproductcalculator.com. KaTeX-rendered vector-math calculator hub. Ships the vanilla-JS calculator widget with 8 operation modes.
Version: 1.0.0
Requires at least: 6.5
Tested up to: 6.7
Requires PHP: 8.1
License: GPL-2.0-or-later
License URI: https://www.gnu.org/licenses/gpl-2.0.html
Text Domain: dotproductcalculator-mtc
Tags: full-site-editing, block-theme, calculator, education, one-column
*/

:root {
  --dpc-paper: #FAFAF7;
  --dpc-chalk: #FFFFFF;
  --dpc-ink: #0F172A;
  --dpc-navy: #1E3A5F;
  --dpc-slate: #475569;
  --dpc-sun: #F5C542;
  --dpc-coral: #E85D5D;
  --dpc-chalk-green: #2F4F3E;
  --dpc-rule: #E2E8F0;
  --dpc-mist: #F1F5F9;
  --dpc-placeholder: #F8FAFC;
}

body {
  background: var(--dpc-paper);
  color: var(--dpc-ink);
}

.skip-link { position: absolute; left: -9999px; top: 0; background: var(--dpc-navy); color: var(--dpc-chalk); padding: 8px 16px; z-index: 9999; }
.skip-link:focus { left: 8px; top: 8px; }

/* Calculator widget */
.dpc-calc, [data-dpc-calc] {
  --calc-bg: var(--dpc-chalk);
  --calc-fg: var(--dpc-ink);
  --calc-accent: var(--dpc-sun);
  --calc-border: var(--dpc-rule);
  --calc-input-bg: var(--dpc-chalk);
  background: var(--calc-bg);
  color: var(--calc-fg);
  border: 1px solid var(--dpc-navy);
  border-radius: 8px;
  padding: 24px;
  margin: 24px 0;
  max-width: 720px;
  font-family: Inter, system-ui, -apple-system, "Segoe UI", sans-serif;
}
.calc__mode-toggle { display: inline-flex; gap: 4px; margin-bottom: 16px; border: 1px solid var(--calc-border); border-radius: 999px; padding: 4px; }
.calc__mode-toggle button { border: 0; background: transparent; padding: 6px 14px; border-radius: 999px; font-weight: 600; cursor: pointer; color: var(--dpc-slate); }
.calc__mode-toggle button[aria-selected="true"] { background: var(--dpc-navy); color: var(--dpc-chalk); }
.calc__op-picker { margin-bottom: 16px; display: flex; align-items: center; gap: 8px; }
.calc__op-picker select { padding: 8px 12px; border: 1px solid var(--calc-border); border-radius: 6px; font: inherit; min-height: 44px; }
.calc__inputs { display: grid; gap: 12px; margin-bottom: 16px; }
.calc__vector { display: grid; grid-template-columns: 100px repeat(3, 1fr); gap: 8px; align-items: center; }
.calc__label { font-weight: 600; }
.calc__label em { font-style: italic; }
.calc__vector input {
  min-height: 44px;
  padding: 8px 12px;
  border: 1px solid var(--calc-border);
  border-radius: 6px;
  font: inherit;
  background: var(--calc-input-bg);
}
.calc__vector input:focus { outline: 2px solid var(--dpc-navy); outline-offset: 2px; }
.calc__actions { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; }
.calc__btn { min-height: 44px; padding: 10px 20px; border-radius: 6px; border: 1px solid transparent; font: inherit; font-weight: 600; cursor: pointer; }
.calc__btn--primary { background: var(--dpc-sun); color: var(--dpc-ink); }
.calc__btn--primary:hover { filter: brightness(0.92); }
.calc__btn--secondary { background: transparent; color: var(--dpc-ink); border-color: var(--calc-border); }
.calc__btn--tertiary { background: var(--dpc-mist); color: var(--dpc-navy); border: 1px solid var(--calc-border); font-weight: 500; }
.calc__result { background: var(--dpc-mist); border-radius: 8px; padding: 20px; }
.calc__result-headline { font-size: 22px; margin-bottom: 12px; }
.calc__steps, .calc__geometric { margin-top: 12px; }
.calc__steps summary, .calc__geometric summary { cursor: pointer; font-weight: 600; padding: 6px 0; }
.calc__steps > div, .calc__geometric > div { padding: 12px 0; }
.calc__orth { color: var(--dpc-coral); font-weight: 600; margin-top: 12px; }
.calc__orth:empty { display: none; }
.calc__msg { color: var(--dpc-slate); font-size: 14px; margin-top: 8px; min-height: 20px; }

@media (max-width: 640px) {
  .calc__vector { grid-template-columns: 80px repeat(3, 1fr); gap: 6px; }
  .calc__label { grid-column: 1 / -1; }
  .calc__vector { grid-template-columns: repeat(3, 1fr); }
}

@media (prefers-reduced-motion: reduce) {
  .calc__steps, .calc__geometric { transition: none !important; }
}

/* Formula callout */
.dpc-formula {
  background: var(--dpc-chalk);
  border-left: 3px solid var(--dpc-chalk-green);
  padding: 20px 24px;
  margin: 24px 0;
  border-radius: 4px;
}

/* Worked example */
.dpc-worked-example { background: var(--dpc-chalk); border: 1px solid var(--dpc-rule); border-radius: 8px; padding: 24px; margin: 24px 0; }
.dpc-worked-example ol { padding-left: 24px; }
.dpc-worked-example li { margin-bottom: 12px; }

/* Related calculators grid */
.dpc-related-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 16px; margin: 24px 0; }
.dpc-related-grid a { display: block; padding: 16px; background: var(--dpc-chalk); border: 1px solid var(--dpc-rule); border-radius: 8px; text-decoration: none; color: var(--dpc-ink); }
.dpc-related-grid a:hover { border-color: var(--dpc-navy); }
.dpc-related-grid strong { display: block; color: var(--dpc-navy); margin-bottom: 4px; }

/* Learn hub card */
.dpc-learn-card { background: var(--dpc-chalk); border: 1px solid var(--dpc-rule); border-radius: 8px; padding: 20px; margin-bottom: 16px; }
.dpc-learn-card h3 { margin-top: 0; }

/* Ad slot placeholder */
.dpc-ad-slot {
  background: var(--dpc-placeholder);
  border: 1px dashed var(--dpc-rule);
  color: var(--dpc-slate);
  font-style: italic;
  font-size: 13px;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 90px;
  margin: 32px auto;
}
.dpc-ad-slot--a { max-width: 728px; }
.dpc-ad-slot--b { min-height: 600px; max-width: 300px; }
.dpc-ad-slot--c { min-height: 280px; max-width: 336px; }
.dpc-ad-slot--d { min-height: 100px; max-width: 728px; }
.dpc-ad-slot--e { min-height: 250px; max-width: 300px; }

/* Trust chips */
.dpc-trust { display: inline-flex; flex-wrap: wrap; gap: 12px; margin: 16px 0; }
.dpc-trust span { background: var(--dpc-sun); color: var(--dpc-ink); padding: 8px 12px; border-radius: 999px; font-weight: 600; font-size: 13px; }

/* Focus */
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible {
  outline: 2px solid var(--dpc-navy);
  outline-offset: 2px;
}