:root{
  --bg:#f5f4f0; --surface:#fbfbf9; --panel:#ffffff; --panel-soft:#f7f6f2;
  --ink:#1c1c1a; --ink-hover:#3a3935; --ink-2:#55534d; --sub:#7a776f; --muted:#8a877f;
  --line:#e3e1db; --line-2:#dcdad3; --line-3:#efeee9; --hover:#efeee9; --soft:#f3f2ee; --track:#ebe9e3;
  --accent:#2f5bea;
  --pass:#1f7a4d; --pass-bg:#e5f3ea; --fail:#b3261e; --fail-bg:#fbe9e7;
  --font:"IBM Plex Sans KR",sans-serif; --mono:"JetBrains Mono",monospace;
  --c:#2f5bea; --on-c:#fff;
}
*{box-sizing:border-box}
[hidden]{display:none !important}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font);-webkit-font-smoothing:antialiased}
button{font:inherit;color:inherit}
code{font-family:var(--mono);font-size:.92em;background:var(--soft);padding:1px 5px;border-radius:4px}
.mono{font-family:var(--mono)}
.mono-label{font-family:var(--mono);font-size:11px;letter-spacing:.12em;color:var(--muted)}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.app{min-height:100vh;display:flex;flex-direction:column}
.topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 28px;border-bottom:1px solid var(--line);background:var(--surface);flex-wrap:wrap}
.brand{display:flex;align-items:baseline;gap:14px;min-width:0;flex-wrap:wrap}
.home{font-size:13px;color:var(--ink-2);text-decoration:none}
.home:hover{color:var(--ink)}
.brand-title{font-size:17px;font-weight:700;letter-spacing:-.01em}
.actions{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.btn{height:36px;padding:0 14px;background:transparent;border:1px solid var(--line-2);border-radius:999px;font-size:13px;cursor:pointer;white-space:nowrap}
.btn:hover{background:var(--hover)}
.btn--sm{height:32px;padding:0 12px;font-size:12px;background:var(--panel)}
.btn--solid{background:var(--ink);color:#fff;border:none;font-weight:500}
.btn--solid:hover{background:var(--ink-hover)}
.text-input{height:40px;padding:0 12px;background:var(--surface);border:1px solid var(--line-2);border-radius:8px;font:inherit;font-size:14px;color:var(--ink)}
.note{font-size:12px;line-height:1.6;color:var(--muted);margin:0}

.seg{display:flex;background:var(--soft);border-radius:999px;padding:3px;gap:2px}
.seg-btn{height:28px;padding:0 10px;background:transparent;color:var(--sub);border:none;border-radius:999px;font-family:var(--mono);font-size:12px;cursor:pointer}
.seg-btn.is-active{background:#fff;color:var(--ink);box-shadow:0 1px 3px rgba(0,0,0,.12)}

.wrap{width:100%;max-width:1180px;margin:0 auto;padding:32px 28px 72px;display:flex;flex-direction:column;gap:28px}

/* ---------- 변환 ---------- */
.convert{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);gap:28px;align-items:stretch}
.hero{position:relative;min-height:380px;border-radius:20px;background:var(--c);color:var(--on-c);padding:22px 24px;display:flex;flex-direction:column;justify-content:space-between;box-shadow:0 1px 2px rgba(0,0,0,.06),0 24px 60px -24px rgba(40,36,28,.35);transition:background-color .18s ease,color .18s ease;overflow:hidden}
.hero::after{content:"";position:absolute;inset:0;border-radius:inherit;box-shadow:inset 0 0 0 1px rgba(0,0,0,.08);pointer-events:none}
.hero-top{display:flex;justify-content:space-between;align-items:center;gap:12px}
.hero-tag{font-size:11px;letter-spacing:.16em;opacity:.75}
.hero-pick{position:relative;display:inline-flex;align-items:center;gap:8px;height:36px;padding:0 16px 0 12px;border-radius:999px;border:1px solid currentColor;font-size:13px;font-weight:500;cursor:pointer;opacity:.92}
.hero-pick::before{content:"";width:14px;height:14px;border-radius:999px;background:conic-gradient(#e0457b,#e8892a,#e8d02a,#2f9e6b,#2f6fdb,#8e4fd6,#e0457b);box-shadow:0 0 0 2px rgba(255,255,255,.6)}
.hero-pick:hover{opacity:1}
.hero-pick input{position:absolute;inset:0;width:100%;height:100%;opacity:0;cursor:pointer;border:0;padding:0}
.hero-hex{align-self:flex-start;background:none;border:none;padding:0;color:inherit;font-size:clamp(44px,7vw,84px);font-weight:700;letter-spacing:-.03em;line-height:1;cursor:pointer;text-align:left}
.hero-hex:hover{opacity:.85}
.hero-foot{font-size:12px;letter-spacing:.04em;opacity:.8;display:flex;gap:14px;flex-wrap:wrap}

.rows{display:flex;flex-direction:column;gap:10px;min-width:0}
.row{display:grid;grid-template-columns:64px minmax(0,1fr) minmax(0,190px);align-items:center;gap:12px;padding:12px 14px;background:var(--panel);border:1px solid var(--line);border-radius:14px;transition:border-color .15s}
.row:focus-within{border-color:var(--ink)}
.row-label{font-size:12px;font-weight:500;letter-spacing:.1em;display:flex;flex-direction:column;line-height:1.2}
.row-label small{font-size:10px;color:var(--muted);letter-spacing:.08em;font-weight:400}
.row-fields{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:6px}
.row-fields--4{grid-template-columns:repeat(4,minmax(0,1fr))}
.f{position:relative;display:block;min-width:0}
.f--wide{grid-column:1/-1}
.f-k{position:absolute;left:9px;top:50%;transform:translateY(-50%);font-family:var(--mono);font-size:10px;color:var(--muted);pointer-events:none}
.field{width:100%;height:38px;padding:0 8px 0 28px;background:var(--surface);border:1px solid var(--line-2);border-radius:8px;font-size:14px;color:var(--ink);-moz-appearance:textfield;appearance:textfield}
.f--wide .field{padding-left:12px;font-size:15px;letter-spacing:.02em}
.field::-webkit-outer-spin-button,.field::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}
.field:focus{outline:none;border-color:var(--accent);background:#fff;box-shadow:0 0 0 3px rgba(47,91,234,.12)}
.field.is-bad{border-color:var(--fail);box-shadow:0 0 0 3px rgba(179,38,30,.1)}
.copy{min-width:0;height:38px;padding:0 12px;background:var(--soft);border:1px solid transparent;border-radius:8px;font-size:12px;color:var(--ink-2);text-align:left;cursor:pointer;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;position:relative;transition:background .15s,color .15s}
.copy:hover{background:var(--ink);color:#fff}
.copy::after{content:"복사";position:absolute;right:10px;top:50%;transform:translateY(-50%);font-family:var(--font);font-size:11px;opacity:0;transition:opacity .15s}
.copy:hover::after{opacity:.7}
.rows .note{padding:4px 2px 0}

/* ---------- 블록 공통 ---------- */
.block{background:var(--panel);border:1px solid var(--line);border-radius:20px;padding:24px 26px 26px;display:flex;flex-direction:column;gap:20px}
.block-head{display:flex;justify-content:space-between;align-items:flex-end;gap:12px;flex-wrap:wrap}
.block-head h2{margin:6px 0 0;font-size:20px;font-weight:700;letter-spacing:-.01em}
.block-actions{display:flex;gap:6px;flex-wrap:wrap}

/* ---------- 대비 ---------- */
.ct-grid{display:grid;grid-template-columns:minmax(0,260px) minmax(0,1fr) minmax(0,1.2fr);gap:22px;align-items:stretch}
.ct-inputs{display:flex;flex-direction:column;gap:8px;justify-content:center}
.ct-color{display:flex;align-items:center;gap:12px;padding:10px;border:1px solid var(--line);border-radius:14px;background:var(--surface)}
.ct-color:focus-within{border-color:var(--ink)}
.ct-dot{position:relative;flex:0 0 auto;width:44px;height:44px;border-radius:12px;box-shadow:inset 0 0 0 1px rgba(0,0,0,.12);overflow:hidden;cursor:pointer}
.ct-dot input{position:absolute;inset:0;width:100%;height:100%;opacity:0;cursor:pointer;border:0;padding:0}
.ct-field{flex:1;min-width:0;display:flex;flex-direction:column;gap:4px}
.ct-k{font-size:12px;color:var(--ink-2)}
.ct-field .field{height:34px;padding-left:10px}
.swap{align-self:center;width:36px;height:36px;border-radius:999px;border:1px solid var(--line-2);background:var(--panel);font-size:16px;cursor:pointer;transition:transform .25s}
.swap:hover{background:var(--hover);transform:rotate(180deg)}

.ct-result{display:flex;flex-direction:column;gap:12px;justify-content:center}
.ratio{font-size:clamp(52px,6.4vw,76px);font-weight:700;letter-spacing:-.04em;line-height:1}
.ratio-unit{font-size:.45em;color:var(--muted);letter-spacing:0;margin-left:4px}
.ratio-verdict{font-size:14px;font-weight:500;min-height:20px}
.badges{display:grid;grid-template-columns:1fr 1fr;gap:6px}
.badge{display:grid;grid-template-columns:auto 1fr;grid-template-rows:auto auto;column-gap:8px;align-items:center;padding:8px 10px;border-radius:10px;background:var(--soft);transition:background .2s,color .2s}
.b-k{grid-row:1/3;font-family:var(--mono);font-size:13px;font-weight:700;min-width:34px}
.b-d{font-size:11px;color:var(--ink-2)}
.b-v{font-size:12px;font-weight:700}
.badge.is-pass{background:var(--pass-bg);color:var(--pass)}
.badge.is-fail{background:var(--fail-bg);color:var(--fail)}
.badge.is-pass .b-d,.badge.is-fail .b-d{color:inherit;opacity:.8}
.badge.pop{animation:pop .35s ease}
@keyframes pop{0%{transform:scale(.96)}60%{transform:scale(1.02)}100%{transform:scale(1)}}

.preview{border-radius:16px;padding:22px 22px;display:flex;flex-direction:column;gap:10px;box-shadow:inset 0 0 0 1px rgba(0,0,0,.08);transition:background-color .18s,color .18s;min-width:0;overflow-wrap:anywhere}
.preview p{margin:0}
.pv-l{font-size:24px;line-height:1.3;font-weight:400}
.pv-b{font-size:18.66px;line-height:1.35}
.pv-n{font-size:16px;line-height:1.6}
.pv-s{font-size:12px;line-height:1.5}
.pv-ui{display:flex;gap:8px;margin-top:4px}
.pv-btn{display:inline-flex;align-items:center;height:32px;padding:0 16px;border-radius:999px;background:var(--pv-fg);color:var(--pv-bg);font-size:13px;font-weight:500}
.pv-chip{display:inline-flex;align-items:center;height:32px;padding:0 12px;border-radius:999px;border:1.5px solid currentColor;font-size:13px}

/* ---------- 스케일 ---------- */
.scale{display:flex;flex-direction:column;gap:14px}
.scale-row{display:grid;grid-template-columns:96px minmax(0,1fr);gap:12px;align-items:center}
.scale-label{font-size:12px;font-weight:500;letter-spacing:.1em;display:flex;flex-direction:column;gap:2px}
.scale-label small{font-family:var(--font);font-size:11px;color:var(--muted);letter-spacing:0;font-weight:400}
.sw-row{display:grid;grid-template-columns:repeat(10,minmax(0,1fr));gap:4px}
.sw{position:relative;height:84px;border:none;border-radius:10px;padding:8px 6px;display:flex;flex-direction:column;justify-content:flex-end;align-items:flex-start;gap:2px;cursor:pointer;box-shadow:inset 0 0 0 1px rgba(0,0,0,.06);transition:transform .15s ease;min-width:0}
.sw:hover{transform:translateY(-3px)}
.sw-p{font-family:var(--mono);font-size:10px;opacity:.75}
.sw-h{font-family:var(--mono);font-size:11px;font-weight:500;letter-spacing:-.02em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:100%}
.sw.is-base::before{content:"";position:absolute;top:8px;left:8px;width:6px;height:6px;border-radius:999px;background:currentColor}

/* ---------- 토스트 ---------- */
.toast{position:fixed;left:50%;bottom:28px;transform:translate(-50%,20px);background:var(--ink);color:#fff;padding:10px 18px;border-radius:999px;font-size:13px;opacity:0;pointer-events:none;transition:opacity .2s,transform .2s;z-index:50;max-width:calc(100% - 32px);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.toast.is-on{opacity:1;transform:translate(-50%,0)}
.toast b{font-family:var(--mono);font-weight:500}

@media (max-width:1020px){
  .ct-grid{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
  .preview{grid-column:1/-1}
}
@media (max-width:860px){
  .convert{grid-template-columns:minmax(0,1fr)}
  .hero{min-height:260px}
}
@media (max-width:640px){
  .topbar{padding:14px 16px}
  .wrap{padding:20px 16px 56px;gap:20px}
  .row{grid-template-columns:minmax(0,1fr);gap:8px;padding:12px}
  .row-label{flex-direction:row;gap:8px;align-items:baseline}
  .copy{width:100%}
  .block{padding:20px 16px;border-radius:16px}
  .ct-grid{grid-template-columns:minmax(0,1fr)}
  .scale-row{grid-template-columns:minmax(0,1fr);gap:6px}
  .scale-label{flex-direction:row;gap:8px;align-items:baseline}
  .sw-row{grid-template-columns:repeat(5,minmax(0,1fr))}
  .sw{height:64px}
  .hero{padding:18px}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{transition:none !important;animation:none !important}
}

/* 다크 모드 (인쇄는 라이트 그대로) — 색 견본 · 대비 미리보기 · 스케일은 고른 색 그대로 */
@media screen{
  :root[data-theme="dark"]{
    color-scheme:dark;
    --bg:#141318; --surface:#1a1920; --panel:#1f1e26; --panel-soft:#24232c;
    --ink:#ecebf0; --ink-hover:#ffffff; --ink-2:#c9c7d1; --sub:#a09eab; --muted:#8a8895;
    --line:#2e2d36; --line-2:#393843; --line-3:#26252d; --hover:#2a2932; --soft:#26252d; --track:#34333d;
    --accent:#7d9bff;
    --pass:#5fd39a; --pass-bg:rgba(95,211,154,.14); --fail:#ff8a80; --fail-bg:rgba(255,138,128,.14);
  }
  :root[data-theme="dark"] .btn--solid,:root[data-theme="dark"] .copy:hover,:root[data-theme="dark"] .toast{color:var(--bg)}
  :root[data-theme="dark"] .seg-btn.is-active{background:var(--line-2);box-shadow:0 1px 3px rgba(0,0,0,.4)}
  :root[data-theme="dark"] .field:focus{background:var(--panel);box-shadow:0 0 0 3px rgba(125,155,255,.18)}
  :root[data-theme="dark"] .field.is-bad{box-shadow:0 0 0 3px rgba(255,138,128,.16)}
  :root[data-theme="dark"] .tb-presets button[aria-pressed="true"]{color:var(--bg)}
  :root[data-theme="dark"] .hero{box-shadow:0 0 0 1px var(--line),0 24px 60px -24px rgba(0,0,0,.6)}
  :root[data-theme="dark"] .preview,:root[data-theme="dark"] .sw,:root[data-theme="dark"] .ct-dot{box-shadow:inset 0 0 0 1px rgba(255,255,255,.1)}
}