:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --text: #172033;
  --muted: #5b6578;
  --line: #dfe5ef;
  --primary: #3856d6;
  --primary-dark: #263fae;
  --accent: #f5b942;
  --success: #13795b;
  --warning-bg: #fff8e5;
  --warning-text: #744f00;
  --shadow: 0 14px 40px rgba(26, 42, 85, .10);
  --radius: 18px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
}
a { color: var(--primary-dark); }
a:hover { text-decoration-thickness: 2px; }
img { max-width: 100%; }
.container { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.skip-link { position: absolute; left: -9999px; top: 8px; }
.skip-link:focus { left: 8px; z-index: 999; background: white; padding: 10px 14px; border-radius: 8px; }
.site-header {
  background: rgba(255,255,255,.96);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(10px);
}
.header-row { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: flex; align-items: center; gap: 11px; text-decoration: none; font-weight: 850; color: var(--text); letter-spacing: -.02em; }
.brand-mark { display: grid; place-items: center; width: 38px; height: 38px; border-radius: 11px; background: var(--primary); color: white; font-weight: 900; }
.site-nav { display: flex; gap: 18px; flex-wrap: wrap; }
.site-nav a { text-decoration: none; font-weight: 700; font-size: .95rem; color: var(--muted); }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--primary); }
.hero { padding: 64px 0 30px; }
.hero-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 32px; align-items: center; }
.eyebrow { color: var(--primary); font-weight: 800; text-transform: uppercase; letter-spacing: .08em; font-size: .78rem; }
h1, h2, h3 { line-height: 1.18; letter-spacing: -.025em; }
h1 { font-size: clamp(2.35rem, 5vw, 4.6rem); margin: 8px 0 18px; }
h2 { font-size: clamp(1.65rem, 3vw, 2.45rem); margin-top: 0; }
h3 { font-size: 1.2rem; }
.lead { font-size: 1.15rem; color: var(--muted); max-width: 68ch; }
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.tool-card { padding: 28px; }
.label { display: block; font-weight: 800; margin-bottom: 8px; }
.input-row { display: flex; gap: 10px; }
input[type="text"] {
  width: 100%;
  min-height: 52px;
  border: 1px solid #bdc8d9;
  border-radius: 12px;
  padding: 0 15px;
  font-size: 1.08rem;
}
input[type="text"]:focus { outline: 3px solid rgba(56,86,214,.18); border-color: var(--primary); }
button, .button {
  border: 0;
  border-radius: 12px;
  min-height: 52px;
  padding: 0 20px;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.primary { background: var(--primary); color: white; }
.primary:hover { background: var(--primary-dark); }
.secondary { background: #eef1ff; color: var(--primary-dark); }
.status { min-height: 26px; margin-top: 12px; color: var(--muted); font-size: .94rem; }
.status.success { color: var(--success); }
.status.warning { color: var(--warning-text); background: var(--warning-bg); padding: 10px 12px; border-radius: 10px; }
.examples { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 14px; }
.example-button { min-height: 36px; padding: 0 12px; background: #f2f4f8; color: var(--text); font-size: .9rem; }
.results { margin-top: 22px; display: none; }
.results.visible { display: block; }
.result-summary { display: flex; justify-content: space-between; align-items: baseline; gap: 20px; flex-wrap: wrap; }
.word-groups { display: grid; gap: 18px; }
.word-group { border-top: 1px solid var(--line); padding-top: 18px; }
.word-list { display: flex; flex-wrap: wrap; gap: 8px; }
.word-chip { background: #f2f5ff; border: 1px solid #d9e0ff; border-radius: 999px; padding: 7px 11px; font-weight: 750; }
.section { padding: 42px 0; }
.section-soft { background: #edf1f8; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.link-card { padding: 22px; text-decoration: none; color: var(--text); transition: transform .15s ease, border-color .15s ease; }
.link-card:hover { transform: translateY(-2px); border-color: var(--primary); }
.link-card p { color: var(--muted); margin-bottom: 0; }
.content-layout { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 30px; align-items: start; }
.article { padding: 34px; }
.article p, .article li { max-width: 76ch; }
.article table { width: 100%; border-collapse: collapse; margin: 22px 0; background: white; }
.article th, .article td { border: 1px solid var(--line); padding: 10px 12px; text-align: left; vertical-align: top; }
.article th { background: #eef1f8; }
.article .note { border-left: 4px solid var(--accent); background: #fff8e8; padding: 14px 16px; border-radius: 0 10px 10px 0; }
.breadcrumbs { font-size: .9rem; color: var(--muted); margin: 22px 0; }
.breadcrumbs a { color: var(--muted); }
.sidebar { padding: 22px; position: sticky; top: 94px; }
.sidebar ul { padding-left: 20px; margin-bottom: 0; }
.meta { color: var(--muted); font-size: .92rem; }
.footer { background: #111827; color: #d7deeb; padding: 42px 0; margin-top: 50px; }
.footer-grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 26px; }
.footer a { color: #edf2ff; }
.footer ul { list-style: none; padding: 0; margin: 0; }
.footer li { margin: 7px 0; }
.footer small { color: #aeb8cb; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }
@media (max-width: 850px) {
  .hero-grid, .content-layout, .footer-grid { grid-template-columns: 1fr; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .header-row { align-items: flex-start; padding: 14px 0; }
  .site-nav { justify-content: flex-end; }
}
@media (max-width: 560px) {
  .input-row { flex-direction: column; }
  .site-nav { display: none; }
  .tool-card, .article { padding: 22px; }
}

/* Interactive search and definition enhancements — 2026-07-20 */
.input-help {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: .9rem;
}
.results-card {
  width: 100%;
  margin-top: 30px;
  padding: 28px;
}
.result-summary > div { min-width: 220px; }
.result-summary h2 { margin-bottom: 0; }
.result-summary p { color: var(--muted); max-width: 70ch; }
.word-groups { gap: 28px; }
.word-group {
  border-top: 1px solid var(--line);
  padding-top: 20px;
  content-visibility: auto;
  contain-intrinsic-size: 240px;
}
.word-group h3 { margin: 0 0 14px; }
.word-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(108px, 1fr));
  gap: 9px;
}
.word-chip {
  width: 100%;
  min-height: 42px;
  padding: 7px 10px;
  border: 1px solid #d9e0ff;
  border-radius: 10px;
  background: #f2f5ff;
  color: var(--primary-dark);
  font-weight: 800;
  line-height: 1.15;
  overflow-wrap: anywhere;
  transition: transform .12s ease, border-color .12s ease, background .12s ease;
}
.word-chip:hover {
  transform: translateY(-1px);
  border-color: var(--primary);
  background: #e8edff;
}
.word-chip:focus-visible {
  outline: 3px solid rgba(56,86,214,.22);
  outline-offset: 2px;
}
.results[aria-busy="true"] { opacity: .72; }

.definition-dialog {
  width: min(760px, calc(100% - 32px));
  max-height: min(84vh, 820px);
  margin: auto;
  padding: 0;
  border: 0;
  border-radius: 18px;
  box-shadow: 0 28px 90px rgba(10, 20, 50, .34);
  color: var(--text);
  background: var(--surface);
  overflow: auto;
}
.definition-dialog::backdrop {
  background: rgba(10, 18, 36, .62);
  backdrop-filter: blur(3px);
}
.definition-shell { padding: 28px; }
.definition-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 16px;
}
.definition-header h2 {
  margin: 4px 0 0;
  font-size: clamp(2rem, 6vw, 3.2rem);
  text-transform: lowercase;
}
.dialog-close {
  min-height: 42px;
  padding: 0 14px;
  background: #eef1f8;
  color: var(--text);
}
.dialog-close:hover { background: #e0e5ef; }
.definition-content { margin-top: 18px; }
.phonetic { color: var(--muted); font-size: 1.05rem; }
.meaning + .meaning { margin-top: 22px; }
.part-of-speech {
  margin: 0 0 8px;
  color: var(--primary-dark);
  font-size: 1.05rem;
  text-transform: capitalize;
}
.definition-list { margin: 0; padding-left: 24px; }
.definition-list li { margin-bottom: 12px; padding-left: 4px; }
.definition-example {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-style: italic;
}
.definition-message {
  background: var(--warning-bg);
  color: var(--warning-text);
  border-radius: 12px;
  padding: 14px 16px;
}
.definition-footer {
  border-top: 1px solid var(--line);
  margin-top: 24px;
  padding-top: 18px;
}
.definition-footer p { color: var(--muted); font-size: .9rem; }

@media (max-width: 560px) {
  .results-card { padding: 20px; }
  .word-list { grid-template-columns: repeat(auto-fill, minmax(88px, 1fr)); gap: 7px; }
  .word-chip { min-height: 40px; padding: 6px 8px; }
  .definition-shell { padding: 20px; }
  .definition-header { gap: 12px; }
}