/* Shared, responsive tool shell. The default is a high contrast light theme. */
:root, [data-theme="light"] {
  color-scheme: light;
  --bg-primary: #f5f7fb; --bg-secondary: #fff; --bg-card: #fff;
  --text-primary: #14243e; --text-secondary: #465772; --text-muted: #53637b;
  --border-color: #b9c5d6; --control-border: #75869e; --accent-blue: #254edb; --accent-cyan: #08766e;
  --gray: #465772; --primary: #254edb; --light: #14243e; --dark: #f5f7fb;
  --shadow-lg: 0 6px 24px #14243e08; --shadow-glow: none; --radius: 10px;
  --surface-soft: #edf2fa; --focus: #254edb; --added-bg: #e1f5ed; --added-text: #07563c;
  --removed-bg: #fce8ed; --removed-text: #8a203c; --warning-bg: #fff4d6; --warning-text: #704c04;
}
[data-theme="dark"] {
  color-scheme: dark;
  --bg-primary: #0e182a; --bg-secondary: #15233a; --bg-card: #15233a;
  --text-primary: #f2f6ff; --text-secondary: #c1cde0; --text-muted: #aebfd7;
  --border-color: #687c9a; --control-border: #687c9a; --accent-blue: #254edb; --accent-cyan: #7ce4d8;
  --gray: #c1cde0; --primary: #254edb; --light: #f2f6ff; --dark: #0e182a;
  --surface-soft: #20324b; --focus: #87b5ff; --added-bg: #153e34; --added-text: #aff5d5;
  --removed-bg: #4d2434; --removed-text: #ffc0d0; --warning-bg: #42351a; --warning-text: #ffe3a0;
}
* { box-sizing: border-box; }
html { scroll-padding-top: 1.5rem; scroll-behavior: auto; }
body { margin: 0; font-size: 16px; line-height: 1.65; background: var(--bg-primary); color: var(--text-primary); font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; }
main, section, .container, .tool-container, .tool-card { min-width: 0; }
.container { max-width: 1184px; padding-inline: 28px; margin-inline: auto; }
a { color: var(--accent-cyan); text-underline-offset: 3px; }
button, input, select, textarea { font: inherit; }
button, .btn { min-height: 44px; padding: 10px 18px; border: 1px solid transparent; border-radius: 7px; background: var(--accent-blue); color: #fff; font-weight: 600; cursor: pointer; transition: border-color .16s; }
button:hover, .btn:hover { background: #193bb6; transform: none; }
button:active { transform: translateY(1px); }
button:disabled { background: var(--surface-soft); color: var(--text-muted); border-color: var(--border-color); opacity: 1; cursor: not-allowed; }
button.secondary, .btn-secondary { color: var(--text-primary); background: var(--bg-secondary); border-color: var(--control-border); }
button.secondary:hover, .btn-secondary:hover { background: var(--surface-soft); }
input:not([type="checkbox"]):not([type="radio"]):not([type="color"]), select, textarea { color: var(--text-primary); background: var(--bg-secondary); border: 1px solid var(--control-border); border-radius: 7px; min-height: 48px; padding: 12px 14px; max-width: 100%; }
textarea { display: block; width: 100%; min-height: 200px; resize: vertical; line-height: 1.7; }
input::placeholder, textarea::placeholder { color: var(--text-muted); opacity: 1; }
input[type="checkbox"], input[type="radio"] { accent-color: var(--accent-blue); width: 19px; height: 19px; flex-shrink: 0; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }
textarea:focus, input:focus { outline: 3px solid var(--focus); outline-offset: 2px; }
[hidden] { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
.skip-link { position: absolute; top: -100px; left: 20px; z-index: 20; padding: 12px 18px; color: #fff; background: #254edb; border-radius: 5px; }
.skip-link:focus { top: 12px; }
.site-header { position: relative; top: auto; z-index: 5; background: var(--bg-secondary); backdrop-filter: none; border-bottom: 1px solid var(--border-color); }
.site-header .site-nav { display: flex; align-items: center; justify-content: space-between; gap: 24px; min-height: 76px; padding-block: 12px; }
.brand { display: inline-flex; gap: 10px; align-items: center; min-height: 44px; font-size: 20px; line-height: 1; font-weight: 750; letter-spacing: -.6px; text-decoration: none; color: var(--text-primary); white-space: nowrap; }
.brand-mark { display: grid; place-items: center; width: 34px; height: 34px; color: white; background: #254edb; border-radius: 8px; font-weight: 800; font-size: 18px; letter-spacing: -2px; padding-right: 2px; }
.site-links { display: flex; align-items: center; gap: 24px; }
.site-links a { display: flex; align-items: center; min-height: 44px; color: var(--text-secondary); font-weight: 600; text-decoration: none; }
.site-links a[aria-current="page"] { color: var(--text-primary); box-shadow: inset 0 -2px var(--accent-blue); }
.site-links button { font-size: 14px; min-width: 60px; padding-inline: 12px; }
.site-footer { margin-top: 48px; padding: 28px 0; background: var(--bg-secondary); border-top: 1px solid var(--border-color); }
.footer-row { display: flex; flex-wrap: wrap; gap: 14px 28px; align-items: center; justify-content: space-between; }
.footer-row p { color: var(--text-muted); font-size: 14px; margin: 0; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 22px; }
.footer-nav a { display: inline-flex; min-height: 44px; align-items: center; text-decoration: none; }
.breadcrumbs { display: flex; flex-wrap: wrap; gap: 10px; margin: 0 0 24px; font-size: 14px; color: var(--text-muted); }
.breadcrumbs a { display: inline-flex; align-items: center; min-height: 44px; color: var(--accent-cyan); }
.breadcrumbs span { align-self: center; }
.tool-page { padding: 20px 0 24px; }
.tool-header { text-align: left; margin: 0 0 26px; max-width: 780px; }
.tool-header h1, .workspace-heading h1 { font-size: clamp(29px, 4vw, 38px); line-height: 1.15; letter-spacing: -1.2px; margin: 4px 0 12px; }
.tool-header p, .workspace-heading > p { color: var(--text-secondary); max-width: 68ch; margin: 0; }
.workspace-heading { margin-bottom: 24px; }
.eyebrow { font-size: 13px; font-weight: 650; color: var(--accent-cyan); letter-spacing: .05em; margin-bottom: 8px; }
.tool-container, div.tool-card { padding: 24px; border: 1px solid var(--border-color); border-radius: 10px; box-shadow: none; background: var(--bg-secondary); }
div.tool-card:hover { transform: none; box-shadow: none; }
.tool-input label, .field label, .editor-label { display: block; font-weight: 650; color: var(--text-primary); margin-bottom: 8px; }
.workspace { padding: 26px; border: 1px solid var(--border-color); border-radius: 12px; background: var(--bg-secondary); }
.workspace-top { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; align-items: center; margin-bottom: 12px; }
.workspace-top label, .workspace-top h2 { margin: 0; font-weight: 650; font-size: 17px; }
.toolbar { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.editor { min-height: 310px; width: 100%; }
.editor-hint, .field-note, .privacy-note { font-size: 14px; color: var(--text-muted); margin: 10px 0 0; }
.privacy-note { display: flex; gap: 8px; align-items: flex-start; }
.privacy-note::before { content: '↳'; color: var(--accent-cyan); font-weight: 700; }
.metrics { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); margin: 20px 0 0; gap: 0; border-top: 1px solid var(--border-color); padding-top: 20px; }
.metrics > div { padding: 0 16px; border-left: 1px solid var(--border-color); }
.metrics > div:first-child { padding-left: 0; border-left: 0; }
.metrics dt { color: var(--text-muted); font-size: 13px; min-height: 42px; line-height: 1.5; }
.metrics dd { margin: 3px 0 0; font-size: 25px; font-weight: 650; letter-spacing: -.5px; font-variant-numeric: tabular-nums; }
.metrics > div:first-child dd { color: var(--accent-cyan); }
.guide { display: grid; grid-template-columns: 1.2fr 1fr; gap: 36px; margin-top: 40px; }
.guide h2 { font-size: 20px; line-height: 1.4; margin-bottom: 12px; }
.guide h3 { margin: 16px 0 8px; font-size: 17px; }
.guide p, .guide li { color: var(--text-secondary); font-size: 15px; max-width: 65ch; }
.guide ul, .guide ol { padding-left: 20px; display: grid; gap: 8px; }
.related-tools { margin-top: 36px; padding-top: 24px; border-top: 1px solid var(--border-color); }
.related-tools h2 { font-size: 17px; }
.related-links a { min-height: 44px; display: inline-flex; align-items: center; }
.status { color: var(--text-secondary); font-size: 14px; margin-top: 14px; min-height: 24px; }
.config-grid, .diff-container { display: grid; grid-template-columns: minmax(0,1fr) minmax(0,1fr); gap: 28px; }
.field { margin-top: 18px; }
.field input, .field textarea { width: 100%; }
.field textarea { min-height: 110px; font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: 14px; }
fieldset { border: 0; padding: 0; margin: 0; min-width: 0; }
legend { font-weight: 650; margin-bottom: 6px; }
.check-row { display: flex; align-items: center; gap: 10px; min-height: 44px; margin: 0; font-weight: 400; cursor: pointer; }
.checks { display: flex; flex-wrap: wrap; gap: 0 20px; }
.field-error { color: var(--removed-text); font-size: 14px; min-height: 0; margin-top: 6px; }
.field-error:empty { margin: 0; }
[aria-invalid="true"] { border-color: var(--removed-text) !important; }
.warning { background: var(--warning-bg); color: var(--warning-text); padding: 14px 16px; border-radius: 7px; margin-top: 14px; font-size: 14px; }
.code-output { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: 14px; min-height: 410px; background: var(--surface-soft); }
.diff-result { min-height: 120px; max-height: 440px; overflow: auto; background: var(--surface-soft); color: var(--text-primary); border: 1px solid var(--border-color); padding: 14px; margin-top: 12px; border-radius: 7px; font: 14px/1.8 ui-monospace, SFMono-Regular, Consolas, monospace; }
.diff-line { display: flex; gap: 14px; padding: 4px 8px; align-items: baseline; }
.diff-text { white-space: pre-wrap; overflow-wrap: anywhere; min-width: 0; }
.diff-numbers { min-width: 58px; color: inherit; font-variant-numeric: tabular-nums; white-space: pre; }
.diff-added { background: var(--added-bg); color: var(--added-text); }
.diff-removed { background: var(--removed-bg); color: var(--removed-text); }
.diff-summary { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; margin-top: 24px; }
.diff-summary h2 { font-size: 17px; margin-right: auto; }
.diff-summary span { font-size: 14px; padding: 4px 8px; border-radius: 4px; }
.home-intro { padding-top: 36px; }
.home-intro h1 { font-size: clamp(30px, 4vw, 44px); line-height: 1.12; letter-spacing: -1.5px; margin: 6px 0 12px; }
.home-intro > p { color: var(--text-secondary); max-width: 65ch; margin-bottom: 24px; }
.search-area label { display: block; font-weight: 600; font-size: 14px; margin-bottom: 8px; }
.search-row { display: grid; grid-template-columns: 1fr auto; gap: 10px; max-width: 760px; }
.search-row input { width: 100%; padding: 14px 16px !important; border-color: var(--control-border); border-radius: 7px; }
.category-nav { display: flex; gap: 8px; flex-wrap: wrap; margin: 18px 0; }
.category-nav a { min-height: 44px; display: inline-flex; align-items: center; font-size: 14px; text-decoration: none; border: 1px solid var(--border-color); border-radius: 6px; padding: 8px 13px; background: var(--bg-secondary); color: var(--text-secondary); }
.category-nav a[aria-current="true"] { color: white; background: #254edb; border-color: #254edb; }
.results-row { display: flex; gap: 12px; align-items: center; justify-content: space-between; padding: 10px 0 18px; border-bottom: 1px solid var(--border-color); color: var(--text-secondary); font-size: 14px; }
.results-row a { display: inline-flex; align-items: center; min-height: 44px; }
.tool-section { padding: 22px 0 12px; background: transparent !important; }
.section-header { margin-bottom: 16px; gap: 10px; }
.section-header h2 { font-size: 19px; letter-spacing: -.3px; }
.section-header .section-icon { display: none; }
.section-header .badge { padding: 1px 0; border: 0; font-size: 13px; margin-left: 4px; color: var(--text-muted); background: none; }
.tool-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
a.tool-card { display: grid; grid-template-columns: 36px 1fr; column-gap: 12px; padding: 18px; border-radius: 8px; box-shadow: none; background: var(--bg-secondary); border: 1px solid var(--border-color); transition: border-color .16s; }
a.tool-card::before { display: none; }
a.tool-card:hover { border-color: var(--accent-cyan); transform: none; box-shadow: none; }
a.tool-card .tool-icon { grid-row: 1 / 3; margin: 0; font-size: 23px; line-height: 1.6; }
a.tool-card:hover .tool-icon { transform: none; }
a.tool-card h3 { font-size: 16px; margin: 0 0 3px; }
a.tool-card p { font-size: 14px; line-height: 1.55; color: var(--text-secondary); }
.empty-state { padding: 40px 24px; margin-top: 24px; border: 1px dashed var(--border-color); border-radius: 10px; background: var(--bg-secondary); }
.empty-state h2 { font-size: 23px; margin: 0 0 8px; }
.empty-state p { color: var(--text-secondary); margin-bottom: 18px; }
.prose { max-width: 820px; }
.prose h1 { margin: 12px 0 24px; font-size: 36px; letter-spacing: -1px; }
.prose h2 { font-size: 21px; margin-top: 26px; }
.prose p, .prose li { color: var(--text-secondary); }
.prose p { margin-top: 10px; }
.prose ul { margin: 12px 0 12px 20px; }
.btn-group { display: flex; flex-wrap: wrap; gap: 10px; }
.check-result.is-error { color: var(--removed-text); }
.result-badge.is-good, .success-message { background: var(--added-bg); color: var(--added-text); }
.result-badge.is-warning, .issue-list { background: var(--warning-bg); color: var(--warning-text); }
@media (max-width: 900px) { .metrics { grid-template-columns: repeat(3,minmax(0,1fr)); gap: 20px 0; } .metrics > div:nth-child(4) { border-left: 0; padding-left: 0; } .tool-grid { grid-template-columns: repeat(2,minmax(0,1fr)); } }
@media (max-width: 700px) {
  .container { padding-inline: 18px; } .site-header .site-nav { gap: 12px; min-height: 68px; }
  .brand { font-size: 18px; gap: 7px; } .brand-mark { width: 30px; height: 30px; }
  .site-links { gap: 12px; font-size: 14px; } .site-links .about-link { display: none; }
  .site-links button { min-width: 50px; padding-inline: 8px; }
  .home-intro { padding-top: 20px; } .home-intro > .eyebrow { display: none; } .home-intro > p { font-size: 15px; margin-bottom: 12px; }
  .category-nav { gap: 6px; } .category-nav a { font-size: 13px; padding-inline: 10px; }
  .results-row { flex-wrap: wrap; padding-bottom: 10px; }
  .config-grid, .diff-container, .guide { grid-template-columns: 1fr; gap: 24px; }
  .workspace { padding: 18px; } .editor { min-height: 260px; }
  .workspace-top .toolbar { width: 100%; } .metrics dd { font-size: 23px; } .metrics > div { padding-inline: 10px; }
  .metrics dt { font-size: 12px; } .code-output { min-height: 290px; }
  .tool-grid { grid-template-columns: 1fr; } .guide { margin-top: 28px; }
  .footer-row { flex-direction: column; align-items: flex-start; } .footer-nav { gap: 18px; }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; } }