: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:#2f4ad0; /* 렌더 코발트 */
  --accent-hover:#2439a8;
  --accent-soft:#e8ecfb;
  --warn:#b54708;
  --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,input,select{font:inherit;color:inherit}
.mono-label{font-family:var(--mono);font-size:11px;letter-spacing:.12em;color:var(--muted)}
.mono{font-family:var(--mono)}
.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:6px 14px;min-width:0;flex-wrap:wrap}
.brand-title{font-size:17px;font-weight:700;letter-spacing:-.01em;margin:0}
.actions{display:flex;gap:8px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;height:36px;padding:0 14px;background:transparent;border:1px solid var(--line-2);border-radius:999px;font-size:13px;cursor:pointer;white-space:nowrap;text-decoration:none;color:var(--ink)}
.btn:hover{background:var(--hover)}
.btn:disabled{opacity:.4;cursor:not-allowed}
.btn:disabled:hover{background:transparent}
.btn--solid{background:var(--ink);color:#fff;border:none;font-weight:500}
.btn--solid:hover{background:var(--ink-hover)}
.btn--small{height:30px;padding:0 11px;font-size:12px}
.btn--ghost{border-style:dashed}
.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} }

.vc{flex:1;width:100%;max-width:1320px;margin:0 auto;padding:28px;display:flex;flex-direction:column;gap:16px}

/* 미지원 안내 */
.unsupported{display:flex;gap:16px;align-items:flex-start;padding:22px 24px;border:1px solid #f1d3b5;background:#fff7ef;border-radius:18px}
.unsupported-ic{flex:none;width:34px;height:34px;border-radius:50%;background:var(--warn);color:#fff;font-weight:700;display:grid;place-items:center;font-family:var(--mono)}
.unsupported h2{margin:2px 0 8px;font-size:16px}
.unsupported p{margin:0 0 6px;font-size:13.5px;line-height:1.7;color:var(--ink-2)}

/* 드롭 영역 */
.drop{display:flex;flex-direction:column;align-items:center;gap:10px;text-align:center;padding:56px 20px;border:1.5px dashed var(--line-2);border-radius:20px;background:var(--surface);cursor:pointer;transition:border-color .15s,background .15s}
.drop:hover,.drop.is-over{border-color:var(--accent);background:var(--accent-soft)}
.drop strong{font-size:16px}
.drop>span{font-size:13px;color:var(--sub);line-height:1.6}
.drop-art{display:flex;align-items:center;gap:10px;margin-bottom:8px;flex-wrap:wrap;justify-content:center}
.reel{display:flex;gap:4px;padding:8px 6px;border-radius:6px;background:var(--ink);
  background-image:radial-gradient(circle,var(--surface) 1.6px,transparent 2px);background-size:8px 7px;background-repeat:repeat-x;background-position:2px 1px}
.reel i{width:28px;height:22px;border-radius:2px;margin:4px 0;background:#8fa0ea}
.reel i:nth-child(2){background:#6077dc}.reel i:nth-child(3){background:#3f58cf}
.arrow{width:26px;height:2px;background:var(--muted);position:relative}
.arrow::after{content:"";position:absolute;right:-1px;top:-4px;border-left:7px solid var(--muted);border-top:5px solid transparent;border-bottom:5px solid transparent}
.chip{font-family:var(--mono);font-weight:500;font-size:12.5px;padding:6px 10px;border-radius:8px;letter-spacing:.08em}
.chip--mp4{background:var(--accent);color:#fff}
.chip--webm{background:var(--panel);border:1px solid var(--line-2);color:var(--ink-2)}
.drop-safe{display:inline-flex;align-items:center;margin-top:4px;padding:6px 12px;border-radius:999px;background:var(--panel);border:1px solid var(--line);font-size:12px !important;color:var(--ink-2) !important}
.dot{display:inline-block;flex:none;width:7px;height:7px;border-radius:50%;background:var(--accent);margin-right:6px;vertical-align:1px}
.alert{margin:0;padding:10px 14px;border-radius:10px;background:#fdecec;color:#9b2226;font-size:13px;line-height:1.6}
.loading{display:flex;align-items:center;gap:10px;margin:0;padding:14px 16px;border-radius:12px;background:var(--panel);border:1px solid var(--line);font-size:13px;color:var(--ink-2)}
.spin{width:16px;height:16px;border-radius:50%;border:2px solid var(--line-2);border-top-color:var(--accent);animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* 작업 영역 */
.workspace{display:grid;grid-template-columns:minmax(0,1fr) 360px;gap:24px;align-items:start;animation:rise .25s ease}
.left{display:flex;flex-direction:column;gap:12px;min-width:0}
.player{background:#111;border-radius:16px;overflow:hidden;display:grid;place-items:center;aspect-ratio:16/9}
.player video{display:block;width:100%;height:100%;object-fit:contain;background:#000}
.specs{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:1px;margin:0;background:var(--line);border:1px solid var(--line);border-radius:14px;overflow:hidden}
.specs div{background:var(--panel);padding:10px 12px;min-width:0}
.specs dt{font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;color:var(--muted);margin-bottom:4px}
.specs dd{margin:0;font-size:13px;font-weight:500;overflow-wrap:anywhere;line-height:1.45}
.mode-note{margin:0;padding:10px 14px;border-radius:10px;background:var(--accent-soft);font-size:12.5px;line-height:1.7;color:var(--ink-2)}

.timeline-card{padding:14px;background:var(--panel);border:1px solid var(--line);border-radius:16px;display:flex;flex-direction:column;gap:12px}
.tl-head{display:flex;justify-content:space-between;align-items:center;gap:8px;flex-wrap:wrap}
.ic-play{width:0;height:0;border-left:8px solid currentColor;border-top:5px solid transparent;border-bottom:5px solid transparent}
#playSel.is-on{background:var(--ink);color:#fff;border-color:var(--ink)}
#playSel.is-on .ic-play{width:8px;height:10px;border:0;border-left:3px solid currentColor;border-right:3px solid currentColor}
.track{position:relative;height:64px;border-radius:10px;background:#222;overflow:hidden;touch-action:none;cursor:pointer;user-select:none;-webkit-user-select:none}
.track.is-locked{opacity:.6;pointer-events:none}
.strip{position:absolute;inset:0;display:flex}
.strip img{flex:1;min-width:0;height:100%;object-fit:cover;opacity:.9}
.shade{position:absolute;top:0;bottom:0;background:rgba(15,15,15,.64);pointer-events:none}
.shade--l{left:0}.shade--r{right:0}
.sel{position:absolute;top:0;bottom:0;border:3px solid var(--accent);border-left:0;border-right:0;pointer-events:none}
.cursor{position:absolute;top:0;bottom:0;width:2px;margin-left:-1px;background:#fff;box-shadow:0 0 0 1px rgba(0,0,0,.35);pointer-events:none}
.handle{position:absolute;top:0;bottom:0;width:20px;margin-left:-10px;border:0;padding:0;background:transparent;cursor:ew-resize;touch-action:none}
.handle::before{content:"";position:absolute;top:0;bottom:0;left:4px;width:12px;border-radius:4px;background:var(--accent)}
.handle::after{content:"";position:absolute;top:50%;left:9px;width:2px;height:18px;margin-top:-9px;background:rgba(255,255,255,.85);border-radius:1px}
.handle:focus-visible{outline:none}
.handle:focus-visible::before{box-shadow:0 0 0 2px #fff,0 0 0 4px var(--accent)}
.range-row{display:flex;align-items:flex-end;gap:8px 10px;flex-wrap:wrap}
.time{display:flex;flex-direction:column;gap:4px;font-size:12px;color:var(--ink-2)}
.time-input{width:108px;height:36px;padding:0 10px;border:1px solid var(--line-2);border-radius:10px;background:var(--surface);font-family:var(--mono);font-size:13.5px;color:var(--ink)}
.time-input.is-bad{border-color:#e5484d}
.time-input:disabled{opacity:.5}
.range-row .btn--small{height:36px}
.time--len{margin-left:auto}
.time--len output{height:36px;display:flex;align-items:center;font-family:var(--mono);font-size:14px;font-weight:500;color:var(--accent)}
.tl-hint{margin:0;font-size:11.5px;color:var(--sub);line-height:1.6}

/* 설정 패널 */
.panel{display:flex;flex-direction:column;gap:12px;min-width:0}
.box{display:flex;flex-direction:column;gap:16px;padding:18px;background:var(--panel);border:1px solid var(--line);border-radius:16px}
.box-title{margin:0;font-size:14px;font-weight:700}
.field{display:flex;flex-direction:column;gap:8px;min-width:0}
.field-row{display:flex;justify-content:space-between;align-items:center;gap:8px}
.field-label{font-size:12.5px;color:var(--ink-2);font-weight:500}
.field-label small{font-weight:400;color:var(--muted)}
.field--inline{gap:6px}
.select{height:38px;padding:0 8px;border:1px solid var(--line-2);border-radius:10px;background:var(--surface);font-size:13px;width:100%;min-width:0}
.sub-note{margin:0;padding:9px 11px;border-radius:10px;background:#fff7ef;color:#7a3e0c;font-size:12px;line-height:1.65}

.fmt{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.fmt-opt{display:flex;flex-direction:column;align-items:flex-start;gap:2px;padding:11px 12px;border:1.5px solid var(--line-2);border-radius:12px;background:var(--surface);text-align:left;cursor:pointer;transition:border-color .12s,background .12s;min-width:0}
.fmt-opt b{font-family:var(--mono);font-size:15px;font-weight:500;letter-spacing:.04em}
.fmt-opt small{font-size:11.5px;color:var(--ink-2)}
.fmt-opt em{font-style:normal;font-size:11px;color:var(--muted);line-height:1.45}
.fmt-opt:hover{border-color:var(--ink-2)}
.fmt-opt[aria-checked="true"]{border-color:var(--accent);background:var(--accent-soft)}
.fmt-opt[aria-checked="true"] b{color:var(--accent)}
.fmt-opt:disabled{opacity:.4;cursor:not-allowed}
.fmt-opt:disabled:hover{border-color:var(--line-2)}

.seg{display:flex;padding:3px;background:var(--soft);border:1px solid var(--line);border-radius:999px;gap:2px}
.seg button{flex:1;min-width:0;height:32px;border:0;border-radius:999px;background:transparent;font-size:12.5px;cursor:pointer;color:var(--ink-2);white-space:nowrap;padding:0 6px}
.seg button:hover{background:var(--hover)}
.seg button[aria-checked="true"]{background:var(--panel);color:var(--ink);font-weight:500;box-shadow:0 1px 2px rgba(0,0,0,.08),0 0 0 1px var(--line-2)}
.seg button:disabled{opacity:.35;cursor:not-allowed;background:transparent}

.range{width:100%;accent-color:var(--accent);margin:0}
.range:disabled{opacity:.5}
.panel .tb-num{width:5em}
.panel .tb-presets{margin-top:2px}
.panel .tb-presets button{flex:1 1 auto}

.switch{display:flex;align-items:center;gap:10px;cursor:pointer;font-size:13px;position:relative}
.switch input{position:absolute;opacity:0;width:1px;height:1px}
.switch-ui{flex:none;width:38px;height:22px;border-radius:999px;background:var(--line-2);position:relative;transition:background .15s}
.switch-ui::after{content:"";position:absolute;top:3px;left:3px;width:16px;height:16px;border-radius:50%;background:#fff;box-shadow:0 1px 2px rgba(0,0,0,.2);transition:transform .15s}
.switch input:checked+.switch-ui{background:var(--accent)}
.switch input:checked+.switch-ui::after{transform:translateX(16px)}
.switch input:focus-visible+.switch-ui{outline:2px solid var(--accent);outline-offset:2px}
.switch input:disabled~*{opacity:.55}
.switch-text{display:flex;flex-direction:column;gap:1px;font-weight:500}
.switch-text small{font-weight:400;font-size:11.5px;color:var(--muted)}

.estimate{padding:12px 14px;border-radius:12px;background:var(--soft);font-size:12.5px;line-height:1.6;color:var(--ink-2)}
.est-main{display:flex;justify-content:space-between;align-items:baseline;gap:8px;margin-bottom:4px}
.est-main span{font-size:12.5px}
.est-main b{font-family:var(--mono);font-size:20px;font-weight:500;color:var(--ink)}
.est-sub b{font-family:var(--mono);font-weight:500;color:var(--ink)}
.est-warn{margin:8px 0 0;padding:0 0 0 16px;color:var(--warn);font-size:12px}
.btn--go{height:48px;font-size:15px;background:var(--accent)}
.btn--go:hover{background:var(--accent-hover)}
.btn--go:disabled:hover{background:var(--accent)}
.progress{display:flex;flex-direction:column;gap:7px}
.progress-head{display:flex;justify-content:space-between;gap:8px;font-size:12.5px;color:var(--ink-2)}
.progress-head .mono{font-weight:500;color:var(--ink)}
.bar{height:8px;border-radius:999px;background:var(--track);overflow:hidden}
.bar i{display:block;height:100%;width:0;background:var(--accent);border-radius:inherit;transition:width .15s}
.progress-foot{display:flex;justify-content:space-between;align-items:center;gap:8px;flex-wrap:wrap}
.progress-foot .mono-label{letter-spacing:.04em}
.note{margin:0;font-size:12px;line-height:1.7;color:var(--sub)}
.note b{color:var(--ink-2)}

/* 결과 */
.result{display:grid;grid-template-columns:minmax(0,1fr) 360px;gap:24px;align-items:start;padding:18px;background:var(--panel);border:1.5px solid var(--accent);border-radius:18px;animation:rise .25s ease;scroll-margin-top:16px}
.result-media{background:#111;border-radius:12px;overflow:hidden;display:grid;place-items:center;aspect-ratio:16/9}
.result-media video{display:block;width:100%;height:100%;object-fit:contain;background:#000}
.result-side{display:flex;flex-direction:column;gap:14px;min-width:0}
.result-head{display:flex;justify-content:space-between;align-items:baseline;gap:8px}
.result-head .box-title{font-size:16px}
.compare{display:flex;flex-direction:column;gap:6px;padding:12px 14px;background:var(--soft);border-radius:12px}
.cmp-row{display:flex;justify-content:space-between;align-items:baseline;font-size:12.5px;color:var(--ink-2)}
.cmp-row b{font-size:15px;color:var(--ink);font-weight:500}
.cmp-bar{height:8px;border-radius:999px;background:var(--track);overflow:hidden;margin-bottom:4px}
.cmp-bar i{display:block;height:100%;border-radius:inherit}
.cmp-orig{background:var(--muted);width:100%}
.cmp-out{background:var(--accent);width:0;transition:width .5s ease}
.cmp-delta{margin:2px 0 0;font-size:14px;font-weight:700;color:var(--accent)}
.cmp-delta.is-up{color:var(--warn)}
.res-meta{display:grid;grid-template-columns:1fr 1fr;gap:8px 12px;margin:0}
.res-meta div{min-width:0}
.res-meta dt{font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;color:var(--muted)}
.res-meta dd{margin:2px 0 0;font-size:13px;font-weight:500;overflow-wrap:anywhere}
.hint{margin:0;font-size:12px;color:var(--warn);line-height:1.6}
.btn--save{height:46px;font-size:14.5px;background:var(--accent)}
.btn--save:hover{background:var(--accent-hover)}

.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;max-width:calc(100vw - 32px);text-align:center}
.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:1060px){
  .workspace,.result{grid-template-columns:minmax(0,1fr)}
  .specs{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media (max-width:640px){
  .vc{padding:16px;gap:12px}
  .drop{padding:36px 16px}
  .player,.result-media{border-radius:12px}
  .specs{grid-template-columns:repeat(2,minmax(0,1fr))}
  .specs div:last-child{grid-column:1/-1}
  .range-row{display:grid;grid-template-columns:1fr 1fr;gap:8px}
  .range-row>label:nth-of-type(1){order:1}
  .range-row>label:nth-of-type(2){order:2}
  #setStart{order:3}
  #setEnd{order:4}
  #resetRange{order:5}
  .range-row .time--len{order:6;margin-left:0;flex-direction:row;align-items:center;justify-content:flex-end;gap:8px}
  .time--len output{height:36px}
  .time-input{width:100%}
  .box,.result{padding:14px}
  .fmt-opt em{display:none}
  .unsupported{padding:16px;flex-direction:column}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms !important;transition-duration:.01ms !important}
}

/* 다크 모드 (인쇄는 라이트 그대로) */
@media screen{
  :root[data-theme="dark"]{
    color-scheme:dark;
    --bg:#131418; --surface:#191a1f; --panel:#1e1f25; --panel-soft:#23242b;
    --ink:#eaebf0; --ink-hover:#ffffff; --ink-2:#c6c8d0; --sub:#9d9fab; --muted:#888a96;
    --line:#2c2d35; --line-2:#373842; --line-3:#25262d; --hover:#282930; --soft:#25262d; --track:#32333c;
    --accent:#7d93ff; --accent-hover:#97a8ff; --accent-soft:rgba(125,147,255,.15);
    --warn:#f5a65f;
  }
  :root[data-theme="dark"] .btn--solid,:root[data-theme="dark"] .toast,:root[data-theme="dark"] .chip--mp4,
  :root[data-theme="dark"] #playSel.is-on,:root[data-theme="dark"] .tb-presets button[aria-pressed="true"]{color:var(--bg)}
  :root[data-theme="dark"] .unsupported{background:rgba(245,166,95,.08);border-color:rgba(245,166,95,.3)}
  :root[data-theme="dark"] .unsupported-ic{color:var(--bg)}
  :root[data-theme="dark"] .reel{background-color:#3a3c48}
  :root[data-theme="dark"] .alert{background:rgba(229,72,77,.16);color:#ffaaad}
  :root[data-theme="dark"] .player,:root[data-theme="dark"] .track,:root[data-theme="dark"] .result-media{box-shadow:0 0 0 1px var(--line-2)}
  :root[data-theme="dark"] .handle::after{background:rgba(0,0,0,.55)}
  :root[data-theme="dark"] .time-input.is-bad{border-color:#ff6b70}
  :root[data-theme="dark"] .sub-note{background:rgba(245,166,95,.1);color:#f7c08e}
  :root[data-theme="dark"] .seg button[aria-checked="true"]{background:var(--track);box-shadow:0 1px 2px rgba(0,0,0,.3),0 0 0 1px var(--line-2)}
  :root[data-theme="dark"] .switch-ui::after{box-shadow:0 1px 2px rgba(0,0,0,.5)}
}