:root{--bg:#0e0f13;--panel:#17181e;--panel2:#1e2027;--line:#30323b;--ink:#f4f1e9;--muted:#999ca7;--red:#ff5b45;--yellow:#f4c95d;--blue:#6d8bff;--green:#53c69b;--radius:18px}
[hidden]{display:none!important}
*{box-sizing:border-box}html,body{margin:0;min-height:100%;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif}button,input,select{font:inherit}button,label{touch-action:manipulation}button{cursor:pointer}.app{width:min(1500px,100%);margin:auto;padding:24px}.topbar{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:20px}.topbar h1{display:inline;margin:0 10px 0 0;font-size:42px;letter-spacing:-.08em}.topbar p{display:inline;color:var(--muted);font-size:14px}.eyebrow{display:block;color:var(--red);font-size:10px;font-weight:900;letter-spacing:.16em;margin-bottom:6px}.header-actions{display:flex;gap:10px}.button{border:1px solid var(--line);border-radius:11px;background:#20222a;color:var(--ink);padding:11px 15px;font-weight:800;white-space:nowrap}.button:hover{border-color:#565963}.button.primary{background:var(--red);border-color:var(--red);color:#fff}.button:disabled{opacity:.38;cursor:not-allowed}.button.full{width:100%}.workspace{display:grid;grid-template-columns:minmax(0,1fr) 370px;gap:18px}.preview-column{min-width:0;display:grid;gap:18px}.stage-shell,.timeline-card,.panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 18px 50px #0004}.stage-shell{padding:18px}.stage{position:relative;margin:auto;background:#08090b;overflow:hidden;border-radius:13px;width:min(100%,420px);aspect-ratio:9/16;box-shadow:0 16px 50px #0008}.stage.landscape{width:100%;aspect-ratio:16/9}.stage.square{width:min(100%,620px);aspect-ratio:1}.stage.source{width:100%;aspect-ratio:var(--source-ratio,16/9)}video{width:100%;height:100%;display:block;object-fit:contain;background:#050506}.empty-state{position:absolute;inset:0;display:grid;place-content:center;gap:8px;text-align:center;color:var(--muted);background:radial-gradient(circle at 50% 42%,#262932,#090a0d 62%)}.empty-state span{font-size:64px;font-weight:200;color:var(--red)}.empty-state strong{font-size:18px;color:var(--ink)}.empty-state small{font-size:12px}.title-overlay{position:absolute;z-index:3;top:5.2%;left:50%;transform:translateX(-50%);width:82%;text-align:center;pointer-events:none}.title-overlay span{display:inline-block;max-width:100%;padding:.25em .62em .31em;border-radius:.32em;color:#fff;background:rgba(23,24,30,.88);font-size:44px;font-weight:900;line-height:1.16;letter-spacing:.02em;text-wrap:balance;box-shadow:0 .15em .7em #0006;text-shadow:0 2px 5px #0008}.transport{display:grid;grid-template-columns:42px 70px 1fr 70px;align-items:center;gap:10px;margin-top:14px}.play{width:42px;height:42px;border:0;border-radius:50%;background:var(--red);color:white;font-size:16px;padding-left:4px}.play:disabled{opacity:.35}.time{font:700 12px/1 ui-monospace,SFMono-Regular,Menlo,monospace}.time.muted{color:var(--muted);text-align:right}input[type=range]{width:100%;accent-color:var(--red)}.timeline-card,.panel{padding:17px}.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:12px;margin-bottom:15px}.section-head h2{font-size:18px;margin:0}.hint{font-size:11px;color:var(--muted)}.timeline{height:76px;border:1px solid #363943;background:#111218;border-radius:10px;position:relative;overflow:hidden}.clips{position:absolute;inset:10px 0}.clip{position:absolute;top:0;height:55px;border:0;border-radius:7px;padding:7px 9px;text-align:left;color:#0d1113;overflow:hidden;font-size:11px;font-weight:900;box-shadow:inset 0 0 0 1px #fff5;transition:filter .15s,transform .15s}.clip:hover,.clip.active{filter:brightness(1.13);transform:translateY(-2px)}.clip small{display:block;opacity:.65;margin-top:4px;font-weight:800}.playhead{position:absolute;z-index:5;top:0;bottom:0;left:0;width:2px;background:#fff;pointer-events:none;box-shadow:0 0 8px #fff}.playhead i{position:absolute;left:50%;top:0;transform:translateX(-50%);width:10px;height:10px;background:white;clip-path:polygon(0 0,100% 0,50% 100%)}.ruler{height:18px;position:relative;color:#777a85;font:700 9px/1 ui-monospace,monospace}.tick{position:absolute;bottom:2px;transform:translateX(-50%)}.inspector{display:grid;align-content:start;gap:18px;max-height:calc(100vh - 112px);overflow:auto;padding-right:2px}.field{display:grid;gap:8px;margin:13px 0;color:var(--muted);font-size:12px}.field span{display:flex;justify-content:space-between}.field b{color:var(--ink)}.field select,.field input[type=number]{width:100%;border:1px solid var(--line);border-radius:10px;background:#111218;color:var(--ink);padding:10px;outline:none}.two-cols{display:grid;grid-template-columns:1fr 1fr;gap:12px}.two-cols input[type=color]{width:100%;height:42px;border:1px solid var(--line);border-radius:10px;background:#111218;padding:4px}.stepper{display:grid;grid-template-columns:38px 1fr 38px}.stepper button{border:1px solid var(--line);background:#242630;color:#fff}.stepper button:first-child{border-radius:9px 0 0 9px}.stepper button:last-child{border-radius:0 9px 9px 0}.stepper input{border-radius:0!important;text-align:center;border-left:0!important;border-right:0!important}.badge{padding:5px 9px;border-radius:999px;background:#282a33;color:var(--muted);font-size:10px;font-weight:850}.badge.on{background:#32594b;color:#aaf6d7}.title-list{display:grid;gap:9px}.title-item{border:1px solid var(--line);border-left:4px solid var(--clip-color);border-radius:12px;background:var(--panel2);padding:10px}.title-item.active{outline:2px solid #ffffff26;background:#252832}.title-line{display:grid;grid-template-columns:24px 1fr 31px;gap:7px;align-items:center}.title-num{font-size:11px;color:var(--muted);font-weight:900}.title-input{min-width:0;border:0;border-bottom:1px solid #3c3e48;background:transparent;color:#fff;padding:7px 2px;font-weight:800;outline:none}.delete{border:0;background:#2f2527;color:#ff8e7f;border-radius:8px;height:31px}.time-row{display:grid;grid-template-columns:1fr 1fr;gap:7px;margin-top:9px}.time-cell{display:grid;grid-template-columns:1fr auto;gap:5px}.time-cell input{width:100%;min-width:0;border:1px solid var(--line);border-radius:8px;background:#111218;color:#fff;padding:7px;font:700 11px ui-monospace,monospace}.set-now{border:1px solid var(--line);border-radius:8px;background:#292b34;color:#ddd;font-size:10px;padding:0 7px}.toast{position:fixed;left:50%;bottom:26px;transform:translate(-50%,80px);opacity:0;background:#f7f3ea;color:#16171b;padding:11px 16px;border-radius:999px;font-weight:800;transition:.25s;pointer-events:none;z-index:10}.toast.show{transform:translate(-50%,0);opacity:1}
@media(max-width:1000px){.workspace{grid-template-columns:1fr}.inspector{max-height:none;overflow:visible;grid-template-columns:1fr 1.2fr}.stage{width:min(100%,360px)}}
@media(max-width:700px){.app{padding:14px}.topbar{align-items:flex-start}.topbar p{display:block;margin-top:2px}.topbar h1{font-size:34px}.header-actions{flex-direction:column}.workspace{gap:12px}.stage-shell{padding:10px}.timeline-card,.panel{padding:14px}.inspector{grid-template-columns:1fr}.transport{grid-template-columns:42px 61px 1fr 61px;gap:7px}.hint{display:none}.title-overlay span{font-size:min(var(--title-size,44px),9vw)}}

/* Continuous chapter rail: all top titles share one proportional time axis. */
.title-overlay{top:4.6%;padding:.28em .32em .34em;text-align:left;pointer-events:auto;background:rgba(23,24,30,.88);border:1px solid #ffffff21;border-radius:.42em;box-shadow:0 .15em .7em #0007;overflow:hidden}
.overlay-track{position:relative;height:1.4em;color:#fff;font-size:12px;font-weight:900;line-height:1.25;text-shadow:0 2px 5px #0008}
.overlay-label{position:absolute;top:0;bottom:0;padding:0 .35em;border:0;border-right:1px solid #ffffff38;background:transparent;color:var(--title-color,#fff);opacity:calc(var(--text-opacity,1)*.42);font:inherit;line-height:1.25;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;text-align:center;transition:opacity .15s,background .15s}
.overlay-label.active{opacity:var(--text-opacity,1);background:#ffffff17}.overlay-label.passed{opacity:calc(var(--text-opacity,1)*.76)}
.overlay-progress{position:relative;height:.12em;margin:.16em .25em 0;background:#ffffff35;border-radius:9px}
.overlay-progress i{position:absolute;inset:0 auto 0 0;width:0;background:var(--red);border-radius:inherit}
.overlay-progress b{position:absolute;left:0;top:50%;width:.34em;height:.34em;border-radius:50%;background:#fff;transform:translate(-50%,-50%);box-shadow:0 0 .25em #fff}
.boundary{position:absolute;z-index:6;top:2px;bottom:2px;width:18px;transform:translateX(-50%);cursor:ew-resize;touch-action:none}
.boundary:before{content:"";position:absolute;left:8px;top:0;bottom:0;width:2px;background:#fff;box-shadow:0 0 0 1px #0007,0 0 8px #fff8}
.boundary:after{content:"";position:absolute;left:3px;top:-2px;width:12px;height:10px;border-radius:3px 3px 6px 6px;background:#fff}
.boundary em{position:absolute;left:50%;bottom:3px;transform:translateX(-50%);background:#090a0d;color:#fff;padding:3px 5px;border-radius:5px;font:700 8px ui-monospace,monospace;white-space:nowrap;opacity:0;transition:.15s}.boundary:hover em,.boundary.dragging em{opacity:1}
@media(max-width:700px){.overlay-track{font-size:min(var(--title-size,44px),7vw)}}
.export-panel{position:fixed;z-index:40;inset:0;display:grid;place-items:center;padding:20px;background:#050609d9;backdrop-filter:blur(10px)}.export-dialog{width:min(440px,100%);padding:25px;border:1px solid #3b3e48;border-radius:20px;background:#17181e;box-shadow:0 30px 100px #000}.export-dialog h2{margin:0 0 8px;font-size:23px}.export-dialog p{margin:0;color:var(--muted);font-size:13px}.export-meter{height:8px;margin:22px 0 13px;border-radius:10px;background:#2e3038;overflow:hidden}.export-meter i{display:block;width:0;height:100%;background:linear-gradient(90deg,var(--red),#ffae66);transition:width .15s}.export-meta{display:flex;align-items:center;justify-content:space-between}.export-meta strong{font:900 22px ui-monospace,monospace}