: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:#6c4dff; --accent-soft:#efebff;
  --font:"IBM Plex Sans KR",sans-serif; --mono:"JetBrains Mono",monospace;
}
*{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}
.mono-label{font-family:var(--mono);font-size:11px;letter-spacing:.12em;color:var(--muted)}
.app{min-height:calc(100vh - 48px);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}
.btn{height:36px;padding:0 14px;background:transparent;border:1px solid var(--line-2);border-radius:999px;font-size:13px;cursor:pointer}
.btn:hover{background:var(--hover)}
.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)}
@media (max-width:640px){ .topbar{padding:14px 16px} }

/* ---------- 공통 ---------- */
.mono{font-family:var(--mono)}
.num{font-family:var(--mono);font-size:13px;color:var(--ink-2)}
.actions{display:flex;gap:8px;flex-wrap:wrap}
.btn--sm{height:30px;padding:0 12px;font-size:12px;background:#fff}
input[type=range]{width:100%;accent-color:var(--accent)}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

.layout{flex:1;display:flex;flex-wrap:wrap;align-items:flex-start}

/* ---------- 스테이지 ---------- */
.stage{flex:999 1 420px;min-width:0;padding:32px 28px 40px;display:flex;flex-direction:column;gap:16px}
.canvas-card{position:relative;border-radius:24px;overflow:hidden;border:1px solid var(--line);box-shadow:0 1px 2px rgba(0,0,0,.04),0 20px 50px rgba(60,40,120,.08);transition:background-color .25s}
.canvas-card[data-bg=check]{background:#fff repeating-conic-gradient(#f1f0ec 0 25%,#fff 0 50%) 0 0/20px 20px}
.canvas-card[data-bg=white]{background:#fff}
.canvas-card[data-bg=dark]{background:#17161a;border-color:#17161a}
.preview{display:flex;align-items:center;justify-content:center;height:min(58vh,520px);min-height:300px;padding:28px}
.preview svg{display:block;max-width:100%;max-height:100%;width:100%;height:100%;filter:drop-shadow(0 18px 30px rgba(60,40,120,.14))}
.preview.is-wave{padding:0;align-items:flex-end}
.preview.is-wave.is-down{align-items:flex-start}
.preview.is-wave svg{filter:none;height:auto}
.preview svg path{transition:d .5s cubic-bezier(.3,.8,.3,1)}
.card-foot{position:absolute;left:16px;right:16px;bottom:16px;display:flex;justify-content:space-between;align-items:center;gap:12px;pointer-events:none}
.card-foot > *{pointer-events:auto}
.bg-switch{display:flex;gap:6px;padding:5px;background:rgba(255,255,255,.85);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border-radius:999px;box-shadow:0 1px 4px rgba(0,0,0,.08)}
.bg-dot{width:24px;height:24px;border-radius:50%;border:1px solid var(--line-2);cursor:pointer;padding:0}
.bg-dot--check{background:#fff repeating-conic-gradient(#d8d6cf 0 25%,#fff 0 50%) 0 0/8px 8px}
.bg-dot--white{background:#fff}
.bg-dot--dark{background:#17161a}
.bg-dot.is-active{box-shadow:0 0 0 2px #fff,0 0 0 4px var(--ink)}
.shuffle{display:flex;align-items:center;gap:8px;height:44px;padding:0 20px;border:none;border-radius:999px;background:var(--ink);color:#fff;font-size:14px;font-weight:500;cursor:pointer;box-shadow:0 8px 20px rgba(28,28,26,.25);transition:transform .15s}
.shuffle:hover{background:var(--ink-hover)}
.shuffle:active{transform:scale(.96)}
.shuffle svg{transition:transform .5s}
.shuffle:hover svg{transform:rotate(180deg)}

.code-card{background:#1d1c21;border-radius:16px;overflow:hidden;color:#d9d6ff}
.code-head{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:10px 12px 10px 16px;border-bottom:1px solid #2c2a33}
.code-head .mono-label{color:#8f8aa8}
.code-card .btn--sm{color:var(--ink);border-color:transparent}
.code{margin:0;padding:14px 16px;max-height:150px;overflow:auto;font-family:var(--mono);font-size:12px;line-height:1.6;white-space:pre-wrap;word-break:break-all;color:#cfc9ff}
.privacy{margin:0;font-size:12px;color:var(--muted);display:flex;align-items:center;gap:8px}
.privacy::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--accent);flex:0 0 auto}

/* ---------- 패널 ---------- */
.panel{flex:1 1 320px;min-width:280px;align-self:stretch;border-left:1px solid var(--line);background:var(--panel);padding:24px 24px 40px;display:flex;flex-direction:column;gap:22px}
.pane{display:flex;flex-direction:column;gap:18px}
.group{display:flex;flex-direction:column;gap:14px}
.group--line{border-top:1px solid var(--line-3);padding-top:22px}
.field{display:flex;flex-direction:column;gap:6px}
.field-label{font-size:12px;color:var(--ink-2)}
.field-head{display:flex;justify-content:space-between;align-items:center;font-size:13px;color:var(--ink-2)}
.scale{display:flex;justify-content:space-between;font-size:11px;color:var(--muted)}
/* 슬라이더 직접 입력칸 · 단계 버튼: 단위 자리를 고정 폭으로 둬 입력칸 끝을 맞춤 */
.field-head .tb-num{height:26px;width:48px;padding:0 6px;font-size:12px;color:var(--ink);border-color:var(--line-2);background:var(--surface)}
.field-head .tb-num-wrap{width:62px;font-family:var(--mono);font-size:12px;color:var(--muted);gap:3px}
.field-head > .tb-num{margin-right:14px}
.field .tb-presets{margin-top:2px;gap:4px}
.field .tb-presets button{height:26px;min-width:0;padding:0 9px;font-size:11.5px;border-color:var(--line-2)}
@media (pointer:coarse){.field-head .tb-num{height:32px;width:56px;font-size:16px}.field-head .tb-num-wrap{width:70px}.field .tb-presets button{height:30px}}

.tabs{display:grid;grid-template-columns:1fr 1fr;gap:6px;padding:5px;background:var(--soft);border-radius:16px}
.tab{height:52px;border:none;border-radius:12px;background:transparent;color:var(--sub);font-size:15px;font-weight:500;display:flex;align-items:center;justify-content:center;gap:8px;cursor:pointer;transition:background .2s,color .2s}
.tab.is-active{background:#fff;color:var(--accent);box-shadow:0 2px 8px rgba(60,40,120,.12)}

.seg{display:flex;background:var(--soft);border-radius:999px;padding:3px;gap:2px}
.seg-btn{flex:1;height:32px;padding:0 6px;background:transparent;color:var(--sub);border:none;border-radius:999px;font-size:13px;cursor:pointer;white-space:nowrap}
.seg-btn.is-active{background:#fff;color:var(--ink);font-weight:500;box-shadow:0 1px 3px rgba(0,0,0,.12)}

.colors{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.color-field{display:flex;align-items:center;gap:10px;padding:8px;border:1px solid var(--line-2);border-radius:12px;cursor:pointer;min-width:0}
.color-field:hover{border-color:var(--ink-2)}
.color-field:focus-within{border-color:var(--accent)}
.swatch{position:relative;flex:0 0 auto;width:34px;height:34px;border-radius:9px;box-shadow:inset 0 0 0 1px rgba(0,0,0,.1);overflow:hidden}
.swatch input{position:absolute;inset:0;width:100%;height:100%;opacity:0;cursor:pointer;border:0;padding:0}
.color-meta{display:flex;flex-direction:column;gap:2px;min-width:0}
.hex{font-size:13px}
.presets{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px}
.preset{height:38px;border-radius:10px;border:2px solid transparent;cursor:pointer;padding:0;box-shadow:inset 0 0 0 1px rgba(0,0,0,.06);transition:transform .15s}
.preset:hover{transform:translateY(-2px)}
.preset.is-active{border-color:var(--ink)}

.toast{position:fixed;left:50%;bottom:28px;transform:translate(-50%,20px);padding:10px 18px;background:var(--ink);color:#fff;border-radius:999px;font-size:13px;opacity:0;pointer-events:none;transition:opacity .2s,transform .2s;z-index:10;max-width:calc(100% - 32px);text-align:center}
.toast.is-show{opacity:1;transform:translate(-50%,0)}

@media (max-width:760px){
  .panel{border-left:none;border-top:1px solid var(--line);padding:24px 16px 40px}
  .stage{padding:16px 16px 24px}
  .preview{height:auto;min-height:0;aspect-ratio:1;padding:20px 20px 72px}
  .preview.is-wave{aspect-ratio:auto;height:280px;padding:0}
  .canvas-card{border-radius:18px}
  .shuffle{height:40px;padding:0 16px;font-size:13px}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none !important;transition-duration:.01ms !important}
}

/* 다크 모드 (인쇄는 라이트 그대로) — 미리보기 카드(체크/흰/검정 배경 선택)와 결과 SVG는 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:#a08cff; --accent-soft:rgba(160,140,255,.16);
  }
  :root[data-theme="dark"] .btn--solid,:root[data-theme="dark"] .toast,
  :root[data-theme="dark"] .tb-presets button[aria-pressed="true"]{color:var(--bg)}
  :root[data-theme="dark"] .btn--sm{background:var(--panel)}
  :root[data-theme="dark"] .code-card{box-shadow:inset 0 0 0 1px var(--line-2)}
  :root[data-theme="dark"] .code-card .btn--sm{background:var(--line-2);color:var(--ink)}
  :root[data-theme="dark"] .code-card .btn--sm:hover{background:#45434f}
  :root[data-theme="dark"] .canvas-card{box-shadow:0 20px 50px rgba(0,0,0,.4)}
  :root[data-theme="dark"] .bg-dot.is-active{box-shadow:0 0 0 2px #fff,0 0 0 4px #1c1c1a}
  /* 셔플 버튼은 미리보기 카드 위에 떠 있으므로 라이트 모양 유지 */
  :root[data-theme="dark"] .shuffle{background:#1c1c1a;color:#fff}
  :root[data-theme="dark"] .shuffle:hover{background:#3a3935}
  :root[data-theme="dark"] .tab.is-active,:root[data-theme="dark"] .seg-btn.is-active{background:var(--line-2);box-shadow:0 1px 4px rgba(0,0,0,.4)}
  :root[data-theme="dark"] .swatch,:root[data-theme="dark"] .preset{box-shadow:inset 0 0 0 1px rgba(255,255,255,.1)}
}