: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:#0b8f63; /* 터미널 그린 */
  --accent-soft:#e2f3ec;
  --code-bg:#16181a; --code-ink:#d9dcd6; --code-dim:#7d837b; --code-key:#7ee2b8; --code-str:#f5c46b;
  --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: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}
.brand-title{font-size:17px;font-weight:700;letter-spacing:-.01em}
.actions{display:flex;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}
.btn:hover{background:var(--hover)}
.btn--solid{background:var(--ink);color:#fff;border:none;font-weight:500}
.btn--solid:hover{background:var(--ink-hover)}
.btn:disabled{opacity:.4;cursor:default}
.btn:disabled:hover{background:transparent}
.btn--solid:disabled:hover{background:var(--ink)}
.btn--small{height:32px;font-size:12.5px}
.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)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
@media (max-width:640px){ .topbar{padding:14px 16px} }

/* ---------- 모드 전환 ---------- */
.mode{display:flex;padding:3px;background:var(--soft);border:1px solid var(--line);border-radius:999px;gap:2px}
.mode-btn{height:32px;padding:0 14px;border:none;background:transparent;border-radius:999px;font-size:13px;color:var(--sub);cursor:pointer;white-space:nowrap;transition:background .15s,color .15s}
.mode-btn.is-active{background:var(--ink);color:#fff}

/* ---------- 레이아웃 ---------- */
.wrap{width:100%;max-width:1180px;margin:0 auto;padding:24px 28px 48px;display:flex;flex-direction:column;gap:18px}
.privacy{display:flex;align-items:center;gap:10px;margin:0;padding:10px 14px;background:var(--accent-soft);color:#155a40;border-radius:10px;font-size:13px;line-height:1.5}
.privacy-dot{flex:0 0 auto;width:8px;height:8px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 4px rgba(11,143,99,.18)}
.panel-grid{display:grid;grid-template-columns:360px minmax(0,1fr);gap:22px;align-items:start}
.source,.output{display:flex;flex-direction:column;gap:14px;min-width:0}

/* ---------- 드롭존 ---------- */
.drop{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;min-height:300px;padding:28px 20px;text-align:center;
  background:var(--panel);border:1.5px dashed var(--line-2);border-radius:16px;cursor:pointer;transition:border-color .15s,background .15s,transform .15s}
.drop:hover,.drop.is-over{border-color:var(--accent);background:#fbfffd}
.drop.is-over{transform:scale(1.01)}
.drop:focus-within{border-color:var(--accent)}
.drop-glyph{display:grid;place-items:center;width:64px;height:64px;border-radius:16px;background:var(--code-bg);color:var(--code-key);font-family:var(--mono);font-size:20px;font-weight:500}
.drop-title{font-size:15px;font-weight:700}
.drop-sub{font-size:12.5px;color:var(--sub);line-height:1.6}
kbd{font-family:var(--mono);font-size:11px;padding:1px 5px;border:1px solid var(--line-2);border-bottom-width:2px;border-radius:4px;background:var(--surface)}

.checker{background-color:#fff;background-image:linear-gradient(45deg,#ecebe6 25%,transparent 25%),linear-gradient(-45deg,#ecebe6 25%,transparent 25%),linear-gradient(45deg,transparent 75%,#ecebe6 75%),linear-gradient(-45deg,transparent 75%,#ecebe6 75%);background-size:16px 16px;background-position:0 0,0 8px,8px -8px,-8px 0}

.file-card{display:flex;flex-direction:column;gap:12px;padding:14px;background:var(--panel);border:1px solid var(--line);border-radius:16px;animation:rise .3s ease}
.thumb{height:200px;border-radius:10px;display:grid;place-items:center;overflow:hidden;border:1px solid var(--line-3)}
.thumb img{max-width:100%;max-height:200px;object-fit:contain;display:block}
.meta{margin:0;display:grid;grid-template-columns:1fr;gap:6px}
.meta div{display:flex;justify-content:space-between;gap:12px;font-size:13px}
.meta dt{color:var(--sub)}
.meta dd{margin:0;font-family:var(--mono);font-size:12.5px;text-align:right;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;min-width:0}
.meta--row{grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}
.meta--row div{flex-direction:column;gap:2px;padding:10px 12px;background:var(--panel);border:1px solid var(--line);border-radius:10px}
.meta--row dd{text-align:left}

/* ---------- 용량 증가 ---------- */
.growth{padding:16px;background:var(--panel);border:1px solid var(--line);border-radius:16px;display:flex;flex-direction:column;gap:10px;animation:rise .3s ease}
.growth-head{display:flex;justify-content:space-between;align-items:baseline}
.growth-pct{font-family:var(--mono);font-size:30px;font-weight:500;letter-spacing:-.03em;color:var(--accent)}
.growth-pct.is-warn{color:#c2410c}
.growth-row{display:grid;grid-template-columns:62px minmax(0,1fr) 78px;align-items:center;gap:10px;font-size:12px;color:var(--sub)}
.growth-row b{font-family:var(--mono);font-weight:500;font-size:12px;color:var(--ink);text-align:right}
.gbar{height:8px;border-radius:999px;background:var(--track);overflow:hidden}
.gbar i{display:block;height:100%;width:0;border-radius:999px;background:var(--ink-2);transition:width .5s cubic-bezier(.2,.8,.2,1)}
.gbar--b i{background:var(--accent)}
.gbar--c i{background:repeating-linear-gradient(-45deg,var(--accent) 0 5px,#36b88a 5px 10px)}
.growth-note{margin:2px 0 0;font-size:12px;line-height:1.6;color:var(--sub)}
.growth-note.is-warn{color:#b4400b}

/* ---------- 출력 ---------- */
.fmt-tabs{display:flex;gap:6px;flex-wrap:wrap}
.fmt{height:34px;padding:0 14px;border:1px solid var(--line-2);background:var(--panel);border-radius:999px;font-size:13px;cursor:pointer;transition:all .15s}
.fmt:hover{border-color:var(--ink)}
.fmt.is-active{background:var(--accent);border-color:var(--accent);color:#fff;font-weight:500}
.code-box{background:var(--code-bg);border-radius:16px;overflow:hidden;box-shadow:0 20px 40px -24px rgba(0,0,0,.45)}
.code-head{display:flex;align-items:center;gap:12px;padding:12px 16px;border-bottom:1px solid #2a2d2f}
.dots{display:flex;gap:6px}
.dots i{width:10px;height:10px;border-radius:50%;background:#3a3d40}
.code-name{color:#9aa097;flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.code-len{color:var(--code-key)}
.code{font-variant-ligatures:none;margin:0;padding:18px 18px;min-height:260px;max-height:380px;overflow:auto;font-family:var(--mono);font-size:12.5px;line-height:1.7;color:var(--code-ink);white-space:pre-wrap;word-break:break-all}
.code:focus-visible{outline-offset:-2px}
.code .k{color:var(--code-key)}
.code .s{color:var(--code-str)}
.code .d{color:var(--code-dim)}
.code-empty{color:var(--code-dim);font-family:var(--font)}
.code-cut{display:block;margin-top:10px;color:var(--code-str);font-family:var(--font);font-size:12px}
.code-foot{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:12px 16px;border-top:1px solid #2a2d2f;flex-wrap:wrap}
.check{display:flex;align-items:center;gap:8px;font-size:13px;color:#c9ccc5;cursor:pointer}
.check small{color:var(--code-dim)}
.check input{accent-color:var(--accent);width:16px;height:16px}
.btn--copy{margin-left:auto;background:var(--accent);min-width:110px}
.btn--copy:hover{background:#0a7d57}
.btn--copy:disabled:hover{background:var(--accent)}
.tip{margin:0;padding:14px 16px;border-left:3px solid var(--accent);background:var(--panel);border-radius:0 10px 10px 0;font-size:13px;line-height:1.7;color:var(--ink-2)}
.tip b{color:var(--ink)}

/* ---------- 디코드 ---------- */
.field-label{font-size:14px;font-weight:700}
.b64-input{font-variant-ligatures:none;width:100%;min-height:300px;resize:vertical;padding:14px;border:1px solid var(--line-2);border-radius:14px;background:var(--code-bg);color:var(--code-ink);font-family:var(--mono);font-size:12px;line-height:1.6;word-break:break-all}
.b64-input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(11,143,99,.2)}
.b64-input::placeholder{color:#6b7069}
.row-btns{display:flex;gap:8px;flex-wrap:wrap}
.decode-msg{margin:0;font-size:12.5px;line-height:1.6;color:var(--sub)}
.decode-msg.is-ok{color:var(--accent)}
.decode-msg.is-err{color:#c0392b}
.decoded{min-height:300px;max-height:460px;border-radius:16px;border:1px solid var(--line);display:grid;place-items:center;overflow:hidden;padding:16px}
.decoded img{max-width:100%;max-height:420px;object-fit:contain;display:block;animation:rise .3s ease}
.decoded-empty{font-family:var(--mono);font-size:12px;letter-spacing:.12em;color:var(--muted);background:var(--panel);padding:6px 12px;border-radius:999px}
.btn--wide{height:44px;font-size:14px}

.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:100}
.toast.is-show{opacity:1;transform:translate(-50%,0)}

@keyframes rise{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

@media (max-width:860px){
  .panel-grid{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:640px){
  .wrap{padding:16px 16px 40px}
  .actions{width:100%}
  .mode{width:100%}
  .mode-btn{flex:1;padding:0 8px}
  .drop{min-height:220px}
  .code{min-height:200px;max-height:300px;padding:14px}
  .meta--row{grid-template-columns:repeat(3,minmax(0,1fr))}
  .meta--row div{padding:8px 10px}
  .btn--copy{width:100%}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none !important;transition:none !important}
}

/* 다크 모드 (인쇄는 라이트 그대로). 투명 체커 미리보기는 이미지가 잘 보이도록 밝게 둠 */
@media screen{
  :root[data-theme="dark"]{
    color-scheme:dark;
    --bg:#121413; --surface:#171a18; --panel:#1c1f1d; --panel-soft:#212422;
    --ink:#e7ebe8; --ink-hover:#ffffff; --ink-2:#c4c9c5; --sub:#9aa19c; --muted:#868d88;
    --line:#2b302d; --line-2:#363b38; --line-3:#232725; --hover:#262a28; --soft:#232725; --track:#313633;
    --accent:#34c992; --accent-soft:rgba(52,201,146,.14);
    --code-bg:#0f1110;
  }
  :root[data-theme="dark"] .btn--solid,:root[data-theme="dark"] .toast,:root[data-theme="dark"] .fmt.is-active{color:var(--bg)}
  :root[data-theme="dark"] .btn--solid{background:var(--accent)}
  :root[data-theme="dark"] .btn--solid:hover,:root[data-theme="dark"] .btn--copy:hover{background:#5fd9ac}
  :root[data-theme="dark"] .btn--solid:disabled:hover{background:var(--accent)}
  :root[data-theme="dark"] .mode-btn.is-active{background:var(--line-2);color:var(--ink)}
  :root[data-theme="dark"] .privacy{color:#9fdcc2}
  :root[data-theme="dark"] .drop:hover,:root[data-theme="dark"] .drop.is-over{background:#1a221e}
  :root[data-theme="dark"] .drop-glyph{border:1px solid var(--line-2)}
  :root[data-theme="dark"] .growth-pct.is-warn,:root[data-theme="dark"] .growth-note.is-warn{color:#fb923c}
  :root[data-theme="dark"] .code-box,:root[data-theme="dark"] .b64-input{border:1px solid var(--line-2)}
  :root[data-theme="dark"] .decode-msg.is-err{color:#f87171}
  :root[data-theme="dark"] .decoded:not(:has(img:not([hidden]))){background:var(--panel-soft)}
}