:root {
  --paper: #f5f7f4;
  --sheet: #ffffff;
  --ink: #1e2521;
  --muted: #5f6b64;
  --grid: #2f7353;          /* 원고지 green */
  --grid-soft: #c9ddd0;
  --mark: #f2df6b;          /* highlighter */
  --focus: #2446a6;
  --serif: "Noto Serif KR", "Apple SD Gothic Neo", serif;
  --sans: "IBM Plex Sans KR", "Apple SD Gothic Neo", system-ui, sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #151a17; --sheet: #1c221e; --ink: #e6ece8; --muted: #9aa8a0;
    --grid: #6fbf94; --grid-soft: #2c3c33; --mark: #6b5f1c; --focus: #8fa7ff;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font: 16px/1.6 var(--sans);
}
a { color: inherit; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }

/* header */
.top {
  display: flex; gap: 20px; align-items: center; flex-wrap: wrap;
  padding: 14px max(16px, calc((100vw - 1000px) / 2));
  border-bottom: 1px solid var(--grid-soft); background: var(--sheet);
  position: sticky; top: 0; z-index: 5;
}
.mark { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.mark-cell {
  width: 36px; height: 36px; display: grid; place-items: center;
  border: 1.5px solid var(--grid); color: var(--grid);
  font: 600 22px/1 var(--serif);
}
.mark-text { font: 600 18px/1 var(--serif); letter-spacing: .02em; }
.mark-sub { font: 14px/1 var(--serif); color: var(--muted); }
.search { flex: 1; min-width: 220px; }
.search input {
  width: 100%; padding: 9px 12px; font: inherit; color: inherit;
  background: var(--paper); border: 1px solid var(--grid-soft); border-radius: 6px;
}
.search input:focus { border-color: var(--grid); outline: none; box-shadow: 0 0 0 3px color-mix(in srgb, var(--grid) 20%, transparent); }

main { max-width: 1000px; margin: 0 auto; padding: 32px 16px 64px; }
main:focus { outline: none; }
.loading, .empty { color: var(--muted); }
.foot { max-width: 1000px; margin: 0 auto; padding: 24px 16px 40px; color: var(--muted); font-size: 13px; border-top: 1px solid var(--grid-soft); }

h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.3; }
h2 { font-size: 22px; margin: 48px 0 6px; }
h3 { font-size: 18px; margin: 28px 0 8px; }
.sub { color: var(--muted); margin: 0 0 16px; }

/* ---- 원고지 word grid: the signature element ---- */
.sheet { display: inline-flex; flex-direction: column; }
.grid-row { display: flex; }
.cell {
  width: var(--cs, 84px); height: var(--cs, 84px);
  display: grid; place-items: center;
  border: 1.5px solid var(--grid); margin-left: -1.5px;
  font-family: var(--serif); color: var(--ink); background: var(--sheet);
}
.grid-row .cell:first-child { margin-left: 0; }
.row-hanja .cell { font-size: calc(var(--cs, 84px) * .58); font-weight: 600; }
.row-hangul .cell { margin-top: -1.5px; height: calc(var(--cs, 84px) * .62); font-size: calc(var(--cs, 84px) * .34); color: var(--muted); }
.cell.gap { border-color: transparent; background: transparent; }
.cell.blank { color: var(--grid-soft); }
a.cell { text-decoration: none; cursor: pointer; position: relative; }
a.cell:hover, a.cell:focus-visible { background: var(--mark); z-index: 1; }

.word-head { display: flex; gap: 32px; align-items: flex-end; flex-wrap: wrap; }
.word-meta { padding-bottom: 6px; }
.word-meta .lemma { font: 700 40px/1.1 var(--serif); margin: 0; }
.word-meta .en { font-size: 20px; margin: 6px 0 0; }
.tags { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 10px; color: var(--muted); font-size: 14px; }
.tag { padding: 1px 8px; border: 1px solid var(--grid-soft); border-radius: 4px; }
.sense-pos { font-size: 12px; margin-right: 8px; color: var(--muted); vertical-align: 1px; }
.tag.lv1 { border-color: var(--grid); color: var(--grid); }

.senses { margin: 28px 0 0; padding: 0; list-style: none; max-width: 70ch; }
.senses li { padding: 12px 0; border-top: 1px solid var(--grid-soft); }
.senses .ko { font-family: var(--serif); }
.senses .en-def { color: var(--muted); margin: 2px 0 0; }
.senses .ex { margin: 6px 0 0; padding-left: 14px; border-left: 2px solid var(--grid-soft); font-family: var(--serif); font-size: 15px; }

/* ---- word lists ---- */
.words { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 0; margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--grid-soft); }
.words li { border-bottom: 1px solid var(--grid-soft); }
.w { display: block; padding: 10px 12px 10px 0; text-decoration: none; }
.w:hover .w-k, .w:focus-visible .w-k { text-decoration: underline; text-decoration-color: var(--grid); text-underline-offset: 4px; }
.w-k { font: 600 19px/1.3 var(--serif); }
.w-h { font: 15px/1.3 var(--serif); color: var(--muted); margin-left: 6px; }
.w-en { display: block; font-size: 13px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
mark { background: var(--mark); color: inherit; padding: 0 1px; border-radius: 2px; }
.more { margin-top: 12px; font: inherit; color: var(--grid); background: none; border: 1px solid var(--grid); border-radius: 6px; padding: 6px 12px; cursor: pointer; }
.more:hover { background: color-mix(in srgb, var(--grid) 10%, transparent); }

.share-head { display: flex; align-items: baseline; gap: 14px; margin: 48px 0 10px; flex-wrap: wrap; }
.share-head h2 { margin: 0; }
.share-head .hc { font: 600 34px/1 var(--serif); text-decoration: none; border: 1.5px solid var(--grid); width: 52px; height: 52px; display: grid; place-items: center; align-self: center; }
.share-head .hc:hover { background: var(--mark); }
.sense-note { margin: 0 0 12px; color: var(--muted); }
.sense-note strong { color: var(--ink); font-family: var(--serif); }

/* ---- hanja page ---- */
.hanja-head { display: flex; gap: 32px; align-items: flex-start; flex-wrap: wrap; }
.big { --cs: 168px; }
.big .cell { font-size: 120px; font-weight: 600; }
.readings { margin: 0; padding: 0; list-style: none; }
.readings li { margin: 0 0 12px; }
.eumhun { font: 600 28px/1.2 var(--serif); }
.eumhun .eum { color: var(--grid); }
.readings .gl { color: var(--muted); }
.facts { color: var(--muted); font-size: 14px; margin-top: 8px; }
.facts a { color: var(--grid); }
.filters { display: flex; gap: 8px; flex-wrap: wrap; margin: 28px 0 0; }
.filters button { font: inherit; font-size: 14px; padding: 4px 12px; border-radius: 999px; border: 1px solid var(--grid-soft); background: var(--sheet); color: inherit; cursor: pointer; }
.filters button[aria-pressed="true"] { background: var(--grid); border-color: var(--grid); color: var(--sheet); }
.sense-intro { margin: 20px 0 0; }

/* sound page */
.sound-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 0 24px; padding: 0; list-style: none; }
.sound-list li { display: flex; gap: 14px; padding: 14px 0; border-top: 1px solid var(--grid-soft); }
.sound-list .hc { flex: none; font: 600 32px/1 var(--serif); width: 56px; height: 56px; display: grid; place-items: center; border: 1.5px solid var(--grid); text-decoration: none; }
.sound-list .hc:hover { background: var(--mark); }
.sound-list .eumhun { font-size: 18px; }
.sound-list .ex-words { font-size: 14px; color: var(--muted); }
.sound-list .ex-words a { color: inherit; }

/* home */
.hero { margin: 8px 0 40px; }
.hero h1 { font-size: clamp(30px, 5vw, 46px); margin: 24px 0 10px; max-width: 18ch; }
.hero p { max-width: 60ch; color: var(--muted); font-size: 18px; margin: 0; }
.demo { margin-top: 28px; }
.demo-caption { color: var(--muted); font-size: 14px; margin-top: 10px; }
.btn { font: inherit; color: var(--sheet); background: var(--grid); border: none; border-radius: 6px; padding: 8px 16px; cursor: pointer; }

/* popover */
.pop {
  position: fixed; z-index: 20; max-width: 300px; padding: 12px 14px;
  background: var(--sheet); color: var(--ink); border: 1.5px solid var(--grid); border-radius: 6px;
  box-shadow: 0 6px 24px rgba(20, 40, 30, .14); font-size: 14px; pointer-events: none;
}
.pop .p-char { font: 600 30px/1 var(--serif); float: left; margin: 2px 12px 4px 0; }
.pop .eumhun { font-size: 17px; }
.pop .gl { color: var(--muted); }
.pop .n { clear: both; color: var(--muted); font-size: 12px; padding-top: 6px; }

@media (max-width: 560px) {
  .sheet { --cs: 60px; }
  .big { --cs: 120px; }
  .big .cell { font-size: 84px; }
  .word-meta .lemma { font-size: 32px; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }