/* WearGauge Styles */
:root {
  --color-bg: #1a1a1f;
  --color-surface: #242430;
  --color-surface-alt: #2d2d3d;
  --color-border: #3a3a4f;
  --color-text: #e8e6e1;
  --color-text-muted: #9a98a0;
  --color-accent: #d4942a;
  --color-accent-light: #e8b04a;
  --color-accent-dark: #b07020;
  --color-keep: #3a9d5e;
  --color-keep-bg: rgba(58, 157, 94, 0.12);
  --color-sharpen: #d4a02a;
  --color-sharpen-bg: rgba(212, 160, 42, 0.12);
  --color-replace: #c94a4a;
  --color-replace-bg: rgba(201, 74, 74, 0.12);
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow: 0 2px 12px rgba(0,0,0,0.3);
  --max-width: 1120px;
  --transition: 0.2s ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--color-accent-light); text-decoration: none; transition: color var(--transition); }
a:hover, a:focus-visible { color: var(--color-accent); text-decoration: underline; }

.skip-link {
  position: absolute; top: -100%; left: 16px; z-index: 100;
  background: var(--color-accent); color: #1a1a1f;
  padding: 8px 16px; border-radius: 0 0 var(--radius) var(--radius);
  font-weight: 600;
}
.skip-link:focus { top: 0; }

.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 14px 0;
  position: sticky; top: 0; z-index: 50;
}
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.logo { display: flex; align-items: center; gap: 10px; color: var(--color-text); font-weight: 700; font-size: 1.2rem; }
.logo:hover, .logo:focus-visible { color: var(--color-accent-light); text-decoration: none; }
.logo-icon { color: var(--color-accent); flex-shrink: 0; }

.main-nav ul { display: flex; list-style: none; gap: 20px; }
.main-nav a { color: var(--color-text-muted); font-size: 0.95rem; font-weight: 500; padding: 4px 0; }
.main-nav a:hover, .main-nav a:focus-visible,
.main-nav a[aria-current="page"] { color: var(--color-text); text-decoration: none; }
.main-nav a[aria-current="page"] { border-bottom: 2px solid var(--color-accent); }

/* Hero */
.hero-section { padding: 48px 0 32px; text-align: center; }
.hero-section h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); font-weight: 800; line-height: 1.2; margin-bottom: 12px; color: var(--color-text); }
.hero-sub { font-size: 1.1rem; color: var(--color-text-muted); max-width: 560px; margin: 0 auto; }

/* Section titles */
.section-title { font-size: 1.4rem; font-weight: 700; margin-bottom: 20px; color: var(--color-text); }
.section-into { color: var(--color-text-muted); margin-bottom: 24px; max-width: 680px; }

/* Checker layout */
.checker-section { padding: 20px 0 48px; }
.checker-layout { display: grid; grid-template-columns: 1fr 320px; gap: 32px; align-items: start; }

.checker-main { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: 28px; }

/* Unit toggle */
.unit-toggle { display: flex; gap: 4px; margin-bottom: 24px; }
.unit-btn {
  padding: 6px 16px; border: 1px solid var(--color-border); background: var(--color-surface-alt);
  color: var(--color-text-muted); font-size: 0.85rem; font-weight: 600; cursor: pointer;
  border-radius: var(--radius); transition: all var(--transition);
}
.unit-btn:first-child { border-radius: var(--radius) 0 0 var(--radius); }
.unit-btn:last-child { border-radius: 0 var(--radius) var(--radius) 0; }
.unit-btn.active, .unit-btn[aria-pressed="true"] { background: var(--color-accent); color: #1a1a1f; border-color: var(--color-accent); }
.unit-btn:focus-visible { outline: 2px solid var(--color-accent-light); outline-offset: 2px; }

/* Form */
.form-group { margin-bottom: 18px; }
.form-label { display: block; font-size: 0.85rem; font-weight: 600; color: var(--color-text-muted); margin-bottom: 6px; text-transform: uppercase; letter-spacing: 0.04em; }
.form-select, .form-input {
  width: 100%; padding: 10px 14px; background: var(--color-bg); border: 1px solid var(--color-border);
  border-radius: var(--radius); color: var(--color-text); font-size: 1rem; font-family: var(--font-sans);
  transition: border-color var(--transition);
}
.form-select:focus, .form-input:focus { outline: none; border-color: var(--color-accent); box-shadow: 0 0 0 3px rgba(212, 148, 42, 0.15); }
.form-select option { background: var(--color-bg); color: var(--color-text); }

.input-fields { display: grid; gap: 16px; }
.input-field-group { display: flex; flex-direction: column; gap: 4px; }
.input-field-group .field-hint { font-size: 0.8rem; color: var(--color-text-muted); }
.input-field-group .field-link { font-size: 0.8rem; color: var(--color-accent-light); cursor: pointer; background: none; border: none; padding: 0; text-align: left; }
.input-field-group .field-link:hover { text-decoration: underline; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 20px; border: none; border-radius: var(--radius);
  font-size: 0.95rem; font-weight: 600; font-family: var(--font-sans);
  cursor: pointer; transition: all var(--transition);
}
.btn-primary { background: var(--color-accent); color: #1a1a1f; width: 100%; padding: 12px; font-size: 1rem; }
.btn-primary:hover:not(:disabled) { background: var(--color-accent-light); }
.btn-primary:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-primary:focus-visible { outline: 2px solid var(--color-accent-light); outline-offset: 2px; }
.btn-sm { padding: 6px 14px; font-size: 0.85rem; background: var(--color-surface-alt); color: var(--color-text); border: 1px solid var(--color-border); }
.btn-sm:hover { background: var(--color-border); }
.btn-sm:focus-visible { outline: 2px solid var(--color-accent-light); outline-offset: 2px; }

/* Result card */
.result-card {
  margin-top: 24px; padding: 20px; border-radius: var(--radius);
  border: 1px solid var(--color-border); background: var(--color-surface-alt);
}
.result-card.keep { border-color: var(--color-keep); background: var(--color-keep-bg); }
.result-card.sharpen { border-color: var(--color-sharpen); background: var(--color-sharpen-bg); }
.result-card.replace { border-color: var(--color-replace); background: var(--color-replace-bg); }
.result-header { display: flex; align-items: center; gap: 12px; margin-bottom: 10px; }
.result-badge {
  display: inline-block; padding: 4px 14px; border-radius: 20px;
  font-size: 0.85rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em;
}
.result-badge.keep { background: var(--color-keep); color: #fff; }
.result-badge.sharpen { background: var(--color-sharpen); color: #1a1a1f; }
.result-badge.replace { background: var(--color-replace); color: #fff; }
.result-tool-name { font-weight: 600; font-size: 1.05rem; }
.result-explanation { margin-bottom: 12px; color: var(--color-text); }
.result-details { font-size: 0.9rem; color: var(--color-text-muted); margin-bottom: 16px; }
.result-details code { font-family: var(--font-mono); background: rgba(255,255,255,0.06); padding: 1px 6px; border-radius: 3px; }
.result-actions { display: flex; gap: 8px; flex-wrap: wrap; }

/* Side panel */
.checker-side { display: flex; flex-direction: column; gap: 20px; position: sticky; top: 72px; }
.side-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: 20px; }
.side-card h3 { font-size: 0.95rem; font-weight: 700; margin-bottom: 12px; color: var(--color-text); }

.tip-list { list-style: none; }
.tip-list li { font-size: 0.88rem; color: var(--color-text-muted); padding: 6px 0; border-bottom: 1px solid var(--color-border); }
.tip-list li:last-child { border-bottom: none; }

.meaning-list { display: grid; gap: 10px; }
.meaning-list dt { font-weight: 600; font-size: 0.88rem; }
.meaning-list dd { font-size: 0.85rem; color: var(--color-text-muted); }

.badge-keep { display: inline-block; padding: 2px 10px; border-radius: 12px; background: var(--color-keep); color: #fff; font-size: 0.8rem; font-weight: 700; }
.badge-sharpen { display: inline-block; padding: 2px 10px; border-radius: 12px; background: var(--color-sharpen); color: #1a1a1f; font-size: 0.8rem; font-weight: 700; }
.badge-replace { display: inline-block; padding: 2px 10px; border-radius: 12px; background: var(--color-replace); color: #fff; font-size: 0.8rem; font-weight: 700; }

.history-empty { font-size: 0.85rem; color: var(--color-text-muted); font-style: italic; }
.history-list { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.history-item {
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
  padding: 8px 10px; background: var(--color-bg); border-radius: var(--radius);
  font-size: 0.82rem;
}
.history-item .hi-badge { font-weight: 700; font-size: 0.75rem; padding: 2px 8px; border-radius: 10px; text-transform: uppercase; }
.history-item .hi-badge.keep { background: var(--color-keep); color: #fff; }
.history-item .hi-badge.sharpen { background: var(--color-sharpen); color: #1a1a1f; }
.history-item .hi-badge.replace { background: var(--color-replace); color: #fff; }
.history-item .hi-name { flex: 1; color: var(--color-text); }
.history-item .hi-date { color: var(--color-text-muted); font-size: 0.75rem; white-space: nowrap; }

/* Mistakes section */
.mistakes-section { padding: 48px 0; background: var(--color-surface); }
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 20px; }
.info-card { background: var(--color-bg); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: 20px; }
.info-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; color: var(--color-accent-light); }
.info-card p { font-size: 0.9rem; color: var(--color-text-muted); line-height: 1.55; }

/* Audit section */
.audit-section { padding: 48px 0; }
.audit-steps { list-style: none; counter-reset: step; display: flex; flex-direction: column; gap: 16px; }
.audit-steps li { position: relative; padding-left: 44px; font-size: 0.95rem; color: var(--color-text-muted); line-height: 1.6; }
.audit-steps li::before {
  counter-increment: step; content: counter(step);
  position: absolute; left: 0; top: 0;
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--color-accent); color: #1a1a1f;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 0.85rem;
}
.audit-steps li strong { color: var(--color-text); }

/* Reference section */
.reference-section { padding: 48px 0; background: var(--color-surface); }
.table-wrapper { overflow-x: auto; }
.ref-table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.ref-table th { text-align: left; padding: 10px 14px; background: var(--color-surface-alt); color: var(--color-text-muted); font-weight: 600; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.04em; border-bottom: 2px solid var(--color-border); }
.ref-table td { padding: 10px 14px; border-bottom: 1px solid var(--color-border); color: var(--color-text); }
.ref-table tr:last-child td { border-bottom: none; }
.ref-table tr:hover td { background: rgba(255,255,255,0.02); }

/* Why section */
.why-section { padding: 48px 0; }
.why-section p { color: var(--color-text-muted); margin-bottom: 14px; max-width: 680px; }
.version-note { font-size: 0.8rem; color: var(--color-text-muted); margin-top: 20px; padding-top: 16px; border-top: 1px solid var(--color-border); }

/* Footer */
.site-footer { margin-top: auto; padding: 24px 0; border-top: 1px solid var(--color-border); background: var(--color-surface); }
.footer-inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; font-size: 0.85rem; color: var(--color-text-muted); }
.footer-links { display: flex; list-style: none; gap: 16px; }
.footer-links a { color: var(--color-text-muted); }
.footer-links a:hover { color: var(--color-text); }

/* Utilities */
.hidden { display: none !important; }

/* Responsive */
@media (max-width: 860px) {
  .checker-layout { grid-template-columns: 1fr; }
  .checker-side { position: static; }
  .hero-section { padding: 32px 0 20px; }
  .hero-section h1 { font-size: 1.6rem; }
}

@media (max-width: 520px) {
  .container { padding: 0 14px; }
  .checker-main { padding: 18px; }
  .card-grid { grid-template-columns: 1fr; }
  .main-nav ul { gap: 12px; }
  .main-nav a { font-size: 0.85rem; }
  .result-actions { flex-direction: column; }
  .result-actions .btn { width: 100%; }
  .footer-inner { flex-direction: column; text-align: center; }
}

/* Print */
@media print {
  .site-header, .site-footer, .checker-side, .unit-toggle, .result-actions, .hero-section { display: none; }
  body { background: #fff; color: #000; }
  .checker-main { border: 1px solid #ccc; padding: 16px; }
  .result-card { border: 2px solid #333; padding: 12px; }
}

/* Focus visible */
*:focus-visible { outline: 2px solid var(--color-accent-light); outline-offset: 2px; }

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}


/* Factory-injected deployment helpers. The AI owns the site design above this block. */
.ad-unit {
  width: min(100%, 720px);
  min-height: 120px;
  margin: 24px auto;
  display: block;
}

.legal-page {
  width: min(900px, calc(100% - 32px));
  margin: 40px auto;
}

.factory-fallback-nav {
  width: min(900px, calc(100% - 32px));
  margin: 24px auto 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  align-items: center;
  font-size: 0.95rem;
}

.factory-fallback-nav a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}