/* Layout: 하나의 열, 도구(필터)는 위, 내용은 격자. 장식 없이 정보 위계만 사용 (Rams: Less, but better) */
:root {
  --bg: #e9e9e6;
  --surface: #f6f6f3;
  --ink: #1c1c1a;
  --muted: #66665f;
  --line: #cfcfc9;
  --accent: #d4521b;
  --ok: #2f7d5b;
  --bad: #b3361f;
  --f-gas: #1c1c1a;
  --f-dsl: #5d7080;
  --f-lpg: #3f8a72;
  --f-hyb: #2f6fae;
  --font-display: "Archivo", "Noto Sans KR", system-ui, sans-serif;
  --font-body: "Noto Sans KR", system-ui, -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
  --ease: cubic-bezier(.2, 0, 0, 1);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #151514; --surface: #1e1e1c; --ink: #ecece7; --muted: #9a9a92; --line: #35352f;
    --accent: #f27a42; --ok: #5bc08f; --bad: #f08068;
    --f-gas: #ecece7; --f-dsl: #8fa5b6; --f-lpg: #63b79c; --f-hyb: #6aa6e0;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #151514; --surface: #1e1e1c; --ink: #ecece7; --muted: #9a9a92; --line: #35352f;
  --accent: #f27a42; --ok: #5bc08f; --bad: #f08068;
  --f-gas: #ecece7; --f-dsl: #8fa5b6; --f-lpg: #63b79c; --f-hyb: #6aa6e0;
  color-scheme: dark;
}
* { box-sizing: border-box; }
body {
  background: var(--bg); color: var(--ink);
  font-family: var(--font-body); font-size: 15px; line-height: 1.6;
  padding-block: 32px 56px;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}
.wrap { max-width: 1040px; margin: 0 auto; display: flex; flex-direction: column; gap: 24px; }
button, input { font: inherit; color: inherit; }
button { cursor: pointer; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

header { display: flex; flex-direction: column; gap: 8px; }
.eyebrow { font-family: var(--font-mono); font-size: 12px; letter-spacing: .08em; color: var(--muted); text-transform: uppercase; }
h1 { font-family: var(--font-display); font-weight: 600; font-size: clamp(28px, 5vw, 40px); line-height: 1.15; letter-spacing: -.01em; margin: 0; text-wrap: balance; }
.lede { margin: 0; color: var(--muted); max-width: 62ch; }

/* tabs */
.tabs { display: flex; gap: 24px; box-shadow: inset 0 -1px var(--line); overflow-x: auto; scrollbar-width: none; }
.tabs::-webkit-scrollbar { display: none; }
.tab { flex: none; white-space: nowrap; background: none; border: 0; padding: 10px 0; color: var(--muted); font-weight: 500; position: relative; transition: color .15s var(--ease); }
.tab:hover { color: var(--ink); }
.tab[aria-selected="true"] { color: var(--ink); }
.tab::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 2px; background: var(--accent); transform: scaleX(0); transform-origin: left; transition: transform .22s var(--ease); }
.tab[aria-selected="true"]::after { transform: scaleX(1); }

/* controls */
.controls { display: flex; flex-direction: column; gap: 12px; }
.search { width: 100%; max-width: 420px; padding: 9px 12px; background: var(--surface); border: 1px solid var(--line); border-radius: 6px; transition: border-color .15s var(--ease); }
.search:focus { border-color: var(--ink); outline: none; }
.search:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.chip-row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.chip-label { font-family: var(--font-mono); font-size: 12px; color: var(--muted); min-width: 40px; }
.chip { background: transparent; border: 1px solid var(--line); border-radius: 999px; padding: 4px 12px; font-size: 13px; transition: background .15s var(--ease), color .15s var(--ease), border-color .15s var(--ease), transform .08s var(--ease); }
.chip:hover { border-color: var(--ink); }
.chip:active { transform: scale(.96); }
.chip[aria-pressed="true"] { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.count { font-family: var(--font-mono); font-size: 12px; color: var(--muted); }

/* engine cards */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 12px; align-items: start; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 6px; transition: border-color .15s var(--ease); animation: rise .22s var(--ease) both; min-width: 0; }
.card:hover { border-color: var(--muted); }
.card.open { border-color: var(--ink); }
@keyframes rise { from { opacity: .0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
.head { width: 100%; text-align: left; background: none; border: 0; padding: 14px 14px 12px; display: grid; grid-template-columns: 1fr auto; gap: 4px 12px; transition: transform .08s var(--ease); }
.head:active { transform: scale(.992); }
.code { font-family: var(--font-mono); font-weight: 500; font-size: 14px; overflow-wrap: anywhere; }
.disp { grid-row: span 2; align-self: center; font-family: var(--font-display); font-weight: 600; font-size: 34px; line-height: 1; letter-spacing: -.02em; text-align: right; font-variant-numeric: tabular-nums; }
.disp small { font-size: 13px; font-weight: 500; color: var(--accent); margin-left: 2px; }
.sub { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--muted); flex-wrap: wrap; }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--c, var(--ink)); flex: none; }
.spec { grid-column: 1 / -1; font-family: var(--font-mono); font-size: 12px; color: var(--muted); margin-top: 6px; }
.more { display: grid; grid-template-rows: 0fr; transition: grid-template-rows .26s var(--ease); }
.card.open .more { grid-template-rows: 1fr; }
.more > div { overflow: hidden; min-height: 0; }
.more-in { border-top: 1px solid var(--line); margin: 0 14px; padding: 12px 0 14px; }
.cars { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 6px; }
.cars li { display: flex; justify-content: space-between; gap: 12px; font-size: 13px; }
.cars b { font-weight: 500; }
.cars span { color: var(--muted); text-align: right; }
.note { margin: 10px 0 0; font-size: 13px; color: var(--muted); }
.flag { font-family: var(--font-mono); font-size: 11px; border: 1px solid var(--line); border-radius: 3px; padding: 0 5px; color: var(--muted); }
.empty { color: var(--muted); padding: 32px 0; }

/* by model */
.models { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 12px; align-items: start; }
.model { background: var(--surface); border: 1px solid var(--line); border-radius: 6px; padding: 14px; display: flex; flex-direction: column; gap: 10px; min-width: 0; }
.model h3 { margin: 0; font-family: var(--font-display); font-size: 20px; font-weight: 600; }
.rows { display: flex; flex-direction: column; }
.row { display: grid; grid-template-columns: 8px minmax(0, 1fr) auto; gap: 10px; align-items: center; text-align: left; background: none; border: 0; border-top: 1px solid var(--line); padding: 8px 0; transition: background .15s var(--ease), padding .15s var(--ease); }
.row:first-child { border-top: 0; }
.row:hover { padding-left: 6px; }
.row .c { font-family: var(--font-mono); font-size: 13px; }
.row .d { font-size: 12px; color: var(--muted); display: block; }
.row .l { font-family: var(--font-display); font-weight: 600; font-variant-numeric: tabular-nums; }

/* 차종 사진: 크기는 width/height 속성으로 미리 잡혀 늦게 떠도 카드가 밀리지 않는다 */
.shot { margin: 0; display: flex; flex-direction: column; gap: 4px; }
.shot img { display: block; width: 100%; height: auto; border-radius: 4px; background: var(--bg); }
.shot figcaption { font-size: 11px; line-height: 1.5; color: var(--muted); overflow-wrap: anywhere; }
.shot figcaption a { color: inherit; text-underline-offset: 2px; transition: color .15s var(--ease); }
.shot figcaption a:hover { color: var(--ink); }

/* transmissions */
.model h3 .flag { vertical-align: middle; margin-left: 4px; font-weight: 400; }
.tm-how { margin: 0; font-size: 14px; }
.tm-pc { margin: 0; display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 4px 12px; font-size: 13px; }
.tm-pc dt { font-family: var(--font-mono); font-size: 12px; color: var(--muted); padding-top: 1px; white-space: nowrap; }
.tm-pc dd { margin: 0; }

/* quiz */
.quiz { background: var(--surface); border: 1px solid var(--line); border-radius: 6px; padding: 20px; display: flex; flex-direction: column; gap: 16px; max-width: 560px; }
.q-meta { display: flex; justify-content: space-between; font-family: var(--font-mono); font-size: 12px; color: var(--muted); }
.q-code { font-family: var(--font-mono); font-size: 26px; font-weight: 500; overflow-wrap: anywhere; }
.q-sub { color: var(--muted); font-size: 14px; }
.opts { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
.opt { background: transparent; border: 1px solid var(--line); border-radius: 6px; padding: 12px; text-align: left; font-weight: 500; transition: border-color .15s var(--ease), background .15s var(--ease), transform .08s var(--ease); }
.opt:hover:not(:disabled) { border-color: var(--ink); }
.opt:active:not(:disabled) { transform: scale(.97); }
.opt:disabled { cursor: default; }
.opt.right { border-color: var(--ok); background: color-mix(in srgb, var(--ok) 14%, transparent); }
.opt.wrong { border-color: var(--bad); background: color-mix(in srgb, var(--bad) 12%, transparent); animation: shake .26s var(--ease); }
@keyframes shake { 20% { transform: translateX(-4px); } 50% { transform: translateX(4px); } 80% { transform: translateX(-2px); } }
.fb { min-height: 3em; font-size: 14px; color: var(--muted); }
.fb strong { color: var(--ink); font-weight: 500; }
.next { align-self: flex-start; background: var(--ink); color: var(--bg); border: 0; border-radius: 6px; padding: 9px 18px; font-weight: 500; transition: transform .08s var(--ease), opacity .15s var(--ease); }
.next:active { transform: scale(.97); }
.next:disabled { opacity: .3; cursor: default; }

/* spec table */
.tbig { margin-top: 12px; border: 1px solid var(--line); border-radius: 6px; background: var(--surface); }
.tbl { border-collapse: separate; border-spacing: 0; width: max-content; min-width: 100%; font-size: 13px; }
.tbl th { position: sticky; top: 0; background: var(--surface); text-align: left; font-family: var(--font-mono); font-size: 11px; font-weight: 500; color: var(--muted); padding: 8px 10px; border-bottom: 1px solid var(--line); white-space: nowrap; }
.tbl td { padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; white-space: nowrap; font-variant-numeric: tabular-nums; }
.tbl td.wrap { white-space: normal; min-width: 220px; max-width: 360px; }
.tbl td:first-child, .tbl th:first-child { position: sticky; left: 0; background: var(--surface); z-index: 1; white-space: normal; min-width: 190px; max-width: 260px; }
.tbl tr:last-child td { border-bottom: 0; }
.tbl tbody tr { transition: background .15s var(--ease); }
.tbl tbody tr:hover td { background: color-mix(in srgb, var(--ink) 5%, var(--surface)); }
.sev { display: flex; width: fit-content; align-items: center; gap: 6px; font-family: var(--font-mono); font-size: 11px; margin-top: 4px; }
.sev i { width: 8px; height: 8px; border-radius: 50%; background: var(--ok); flex: none; }
.sev.ok i { background: var(--f-hyb); }
.sev.need i { background: var(--accent); }
.sev.need { color: var(--accent); }
.src { display: block; margin-top: 4px; font-size: 12px; color: var(--muted); white-space: normal; overflow-wrap: anywhere; }
.src a { color: inherit; text-underline-offset: 2px; transition: color .15s var(--ease); }
.src a:hover { color: var(--ink); }
.why { display: block; margin-top: 4px; font-size: 12px; color: var(--muted); white-space: normal; line-height: 1.5; }
/* decoder */
.mono { font-family: var(--font-mono); }
.dec { display: flex; flex-direction: column; gap: 16px; }
.parts { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.part { background: var(--surface); border: 1px solid var(--line); border-radius: 6px; padding: 14px; display: flex; flex-direction: column; gap: 4px; min-width: 0; animation: rise .22s var(--ease) both; }
.part .k { font-family: var(--font-mono); font-size: 12px; color: var(--muted); }
.part .v { font-family: var(--font-mono); font-size: 30px; font-weight: 500; line-height: 1.1; }
.part .m { font-size: 13px; color: var(--muted); overflow-wrap: anywhere; }
.part.off .v { color: var(--muted); }
.dgrid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; align-items: start; }
.dh { margin: 0 0 8px; font-family: var(--font-display); font-weight: 600; font-size: 16px; }
.tscroll { overflow-x: auto; }
.dtable { border-collapse: collapse; width: 100%; font-size: 13px; }
.dtable td { padding: 7px 10px 7px 0; border-top: 1px solid var(--line); vertical-align: top; }
.dtable td:first-child { font-family: var(--font-mono); width: 2.5em; }
.dtable tr.hit td { color: var(--accent); }
.tips { margin: 0; padding-left: 1.1em; display: flex; flex-direction: column; gap: 8px; font-size: 14px; max-width: 72ch; }
@media (max-width: 480px) { .parts { grid-template-columns: 1fr; } }

footer { border-top: 1px solid var(--line); padding-top: 16px; font-size: 13px; color: var(--muted); display: flex; flex-direction: column; gap: 6px; }
footer p { margin: 0; max-width: 72ch; }
footer a { color: inherit; }

@media (max-width: 480px) { .opts { grid-template-columns: 1fr; } .quiz { padding: 16px; } }
@media (prefers-reduced-motion: reduce) { * { animation: none !important; transition: none !important; } }