:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #6b7280;
  --accent: #b30000;      /* Longman red */
  --line: #e5e7eb;
  --chip: #f3f4f6;
  --example: #3a5f8a;
  --maxw: 720px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16181c; --fg: #e6e6e6; --muted: #9aa0aa; --accent: #ff6b6b;
    --line: #2a2d33; --chip: #23262c; --example: #8fb3e0;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg); color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", sans-serif;
  line-height: 1.55;
}

.topbar {
  position: sticky; top: 0; z-index: 10;
  background: var(--bg); border-bottom: 1px solid var(--line);
  padding: 12px 16px calc(12px + env(safe-area-inset-bottom, 0));
}
#search-form {
  display: flex; gap: 8px; max-width: var(--maxw); margin: 0 auto;
}
.search-wrap { position: relative; flex: 1; }
#search-input {
  width: 100%; font-size: 17px; padding: 12px 14px;
  border: 1px solid var(--line); border-radius: 12px;
  background: var(--chip); color: var(--fg);
}

/* Autocomplete dropdown */
.suggest {
  position: absolute; top: calc(100% + 6px); left: 0; right: 0; z-index: 20;
  margin: 0; padding: 4px; list-style: none;
  background: var(--bg); border: 1px solid var(--line); border-radius: 12px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18); max-height: 60vh; overflow-y: auto;
}
.suggest li {
  padding: 10px 12px; border-radius: 8px; cursor: pointer; font-size: 16px;
}
.suggest li.active, .suggest li:hover { background: var(--chip); }
#search-input:focus { outline: 2px solid var(--accent); }
#search-form button {
  font-size: 16px; padding: 0 18px; border: none; border-radius: 12px;
  background: var(--accent); color: #fff; cursor: pointer;
}

main { max-width: var(--maxw); margin: 0 auto; padding: 16px; }
.hint { color: var(--muted); }
.error { color: var(--accent); }

/* Lookup history */
.history-head {
  display: flex; justify-content: space-between; align-items: center;
  color: var(--muted); font-size: 13px; margin-bottom: 10px;
}
.link { border: none; background: none; color: var(--accent); cursor: pointer; font-size: 13px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  border: 1px solid var(--line); background: var(--chip); color: var(--fg);
  padding: 6px 12px; border-radius: 16px; cursor: pointer; font-size: 15px;
}
.chip:active { background: var(--accent); color: #fff; }

.entry { padding: 16px 0; border-bottom: 1px solid var(--line); }

/* Word family */
.wordfam {
  margin-bottom: 12px; padding: 8px 10px; border-radius: 8px;
  background: var(--chip); font-size: 14px; line-height: 1.9;
}
.wordfam-label {
  display: inline-block; background: #e6c200; color: #000; font-weight: 700;
  padding: 0 6px; border-radius: 4px; font-size: 12px; margin-right: 4px;
}
.wf-pos { color: var(--muted); font-style: italic; }
.wf-word { font-weight: 600; }
.entry-head { display: flex; align-items: baseline; flex-wrap: wrap; gap: 8px; }
.hwd { font-size: 26px; margin: 0; color: var(--accent); }
.hwd sup { font-size: 13px; }
.pos { font-style: italic; color: var(--muted); }
.level { letter-spacing: 1px; color: var(--accent); font-size: 12px; }
.freq {
  display: inline-block; background: var(--accent); color: #fff; font-weight: 700;
  font-size: 11px; padding: 1px 5px; border-radius: 4px;
}
.pron { color: var(--muted); font-family: "Times New Roman", serif; }
.variant { color: var(--muted); }
.inflections { color: var(--muted); font-size: 13px; }
.entry-head .gram { font-family: monospace; font-size: 13px; color: var(--muted); }
.audio { display: inline-flex; gap: 6px; }
.spk {
  font-size: 12px; padding: 3px 8px; border: 1px solid var(--line);
  border-radius: 8px; background: var(--chip); color: var(--fg); cursor: pointer;
}
.spk:active { background: var(--accent); color: #fff; }

.senses { margin-top: 10px; }
.sense { margin: 12px 0; }
.sense-head { display: flex; align-items: baseline; flex-wrap: wrap; gap: 8px; }
.num {
  display: inline-flex; min-width: 20px; height: 20px; padding: 0 4px;
  align-items: center; justify-content: center;
  background: var(--accent); color: #fff; border-radius: 6px; font-size: 12px;
}
.signpost { font-weight: 700; }
.gram, .reg { font-size: 12px; color: var(--muted); }
.gram { font-family: monospace; }
.def { margin: 4px 0 0 28px; }
.opp { margin: 2px 0 0 28px; font-size: 14px; }
.opp-label {
  display: inline-block; background: #e6c200; color: #000; font-weight: 700;
  padding: 0 5px; border-radius: 4px; font-size: 11px; margin-right: 4px;
}
.examples { margin: 4px 0 0 28px; padding: 0; list-style: none; }
.example { color: var(--example); font-size: 15px; margin: 2px 0; }
.example::before { content: "› "; opacity: 0.6; }
.spk-mini {
  border: none; background: none; cursor: pointer; padding: 0 4px;
  font-size: 12px; opacity: 0.55; vertical-align: middle;
}
.spk-mini:hover { opacity: 1; }
.spk-mini:active { opacity: 1; transform: scale(0.9); }

/* Collocation / pattern blocks */
.colloc { margin: 6px 0 6px 28px; }
.pattern { font-weight: 700; }
.colloc .examples { margin-left: 0; }

/* Sub-senses */
.subsense { margin: 6px 0 6px 28px; }
.subnum {
  display: inline-flex; align-items: baseline; justify-content: center;
  min-width: 18px; color: var(--accent); font-weight: 700; font-size: 14px;
}

/* Derived words */
.runons { margin-top: 10px; padding-top: 8px; border-top: 1px dashed var(--line); }
.runon { margin-right: 14px; }
.runon-word { font-weight: 700; }

/* Grammar / thesaurus / collocation boxes */
.box {
  margin: 10px 0; border: 1px solid var(--line); border-radius: 10px;
  background: var(--chip); overflow: hidden;
}
.box > summary {
  cursor: pointer; padding: 10px 12px; font-weight: 700; font-size: 14px;
  list-style: none; user-select: none;
}
.box > summary::-webkit-details-marker { display: none; }
.box > summary::before { content: "▸ "; color: var(--accent); }
.box[open] > summary::before { content: "▾ "; }
.box-grammar > summary { color: #2a7d46; }
.box-thesaurus > summary { color: #7a4fb3; }
.box-collocation > summary { color: #b36a00; }
.box-corpus > summary { color: var(--muted); }

/* Etymology */
.origin { margin-top: 12px; padding-top: 8px; border-top: 1px dashed var(--line); font-size: 14px; color: var(--muted); }
.origin-label {
  display: inline-block; background: #e6c200; color: #000; font-weight: 700;
  padding: 0 6px; border-radius: 4px; font-size: 12px; margin-right: 6px;
}
.box-body { padding: 0 12px 12px; }
.box-note, .box-error { margin: 6px 0; font-size: 14px; }
.box-error { color: var(--accent); }

.thes-item { margin: 8px 0; }
.thes-word { font-weight: 700; }
.thes-gloss { color: var(--muted); font-size: 14px; }
.thes-item .examples { margin-left: 14px; }

.colb-heading { font-weight: 700; margin: 10px 0 4px; }
.colb-section { margin: 6px 0; }
.colb-label { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.5px; }
.colb-item { margin: 4px 0; }
.colb-item .examples { margin-left: 14px; }