@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;450;500;600;650;700&family=Manrope:wght@400;500;600;650;700;750;800&display=swap');
:root{--bg:#fafafc;--surface:#fff;--ink:#171826;--muted:#646879;--line:#e3e4ec;--soft:#f0f0f7;--purple:#7260cb;--cyan:#24b8c8;--radius:18px;--max:1180px;color-scheme:light}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:88px}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.65 'DM Sans',sans-serif}button,input,select{font:inherit}button,a,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}a{color:inherit;text-decoration:none}button:focus-visible,a:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid var(--cyan);outline-offset:4px}img{max-width:100%;height:auto}button{color:inherit}h1,h2,h3,p,figure{margin:0}h1,h2,h3,.brand{font-family:'Manrope',sans-serif}h2{font-weight:750;letter-spacing:-1.5px;font-size:clamp(30px,3.1vw,43px);line-height:1.22}h3{line-height:1.3}p+p{margin-top:18px}[hidden]{display:none!important}.wrap{width:min(var(--max),calc(100% - 64px));margin:auto}.section{padding-top:96px;padding-bottom:96px}.nav{height:76px;background:rgba(11,12,21,.92);backdrop-filter:blur(16px);display:flex;align-items:center;justify-content:space-between;padding:0 max(32px,calc((100vw - 1280px)/2));position:sticky;top:0;z-index:20;border-bottom:1px solid #ffffff14;color:#fff}.brand{display:flex;align-items:center;gap:9px;font-size:20px;font-weight:800;letter-spacing:-.7px}.mark{color:#b6a2ff;font-size:31px;line-height:1}.brand-dot{color:#82d8df;margin-left:-8px}.nav nav{display:flex;gap:28px;font-size:13px;color:#bbbecd}.nav nav a:hover{color:white}.theme-toggle{border:1px solid #ffffff30;border-radius:50%;background:transparent;width:34px;height:34px;font-size:21px;line-height:1}.skip{position:absolute;left:20px;top:-60px;z-index:30;background:white;color:black;padding:12px}.skip:focus{top:12px}.hero{position:relative;overflow:hidden;background:#0b0c15;color:#f6f5fc;padding:66px 0 30px}.hero:before{content:'';position:absolute;inset:0;background:radial-gradient(ellipse at 20% 8%,#7661c935,transparent 44%),radial-gradient(ellipse at 92% 28%,#22d3ee18,transparent 38%);pointer-events:none}.hero-orbit{position:absolute;width:1150px;height:800px;left:50%;top:-470px;border:1px solid #ffffff0c;border-radius:50%;transform:translateX(-50%) rotate(-12deg);box-shadow:0 0 0 60px #ffffff02,0 0 0 120px #ffffff02;pointer-events:none}.hero-content{position:relative;text-align:center}.eyebrow,.tiny-label,.section-number{font-size:11px;letter-spacing:2px;font-weight:700}.eyebrow{color:#b8adcf;display:flex;align-items:center;justify-content:center;gap:10px}.status-dot,.ours-dot,.original-dot{display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--cyan);margin-right:6px}.status-dot{box-shadow:0 0 12px #24b8c870}.hero h1{margin-top:18px}.gradient{font-size:clamp(52px,7vw,91px);font-weight:800;letter-spacing:-5px;line-height:1.15;background:linear-gradient(115deg,#e7dcff 15%,#ba9af2 46%,#69d9df 90%);background-clip:text;color:transparent}.paper-title{display:block;font-size:clamp(21px,2.4vw,32px);font-weight:600;letter-spacing:-.9px;line-height:1.4;margin-top:16px}.authors{font-size:14px;color:#a9a6bb;margin-top:22px}.hero-summary{font-size:22px;font-weight:500;margin-top:30px}.hero-summary em{font-style:normal;color:#b2a3e3}.hero-summary>span{display:inline-block;color:#a6a5b7;font-size:15px;font-weight:400;line-height:1.6;margin-top:7px}.hero-actions{display:flex;justify-content:center;gap:12px;margin-top:28px}.button{display:inline-flex;align-items:center;justify-content:center;gap:12px;min-height:44px;padding:10px 20px;border-radius:9px;font-weight:600;font-size:14px;border:1px solid var(--line);background:var(--surface);transition:transform .2s,background .2s}.button:hover{transform:translateY(-2px)}.primary{color:#171525;background:#e8e0fb;border:1px solid #e8e0fb}.ghost{border-color:#ffffff2b;background:#ffffff07;color:#dedbe9}.hero-demo{max-width:1040px;margin:49px auto 0;background:#15161f;border:1px solid #ffffff1c;border-radius:16px;overflow:hidden;text-align:left;box-shadow:0 25px 100px #0004}.demo-top{display:flex;justify-content:space-between;padding:18px 22px;align-items:center}.tiny-label{color:var(--purple)}.demo-top .tiny-label{color:#aca0c8;font-size:10px}.demo-description{font-size:12px;color:#9393a4}.pair{display:grid;grid-template-columns:1fr 1fr;gap:16px}.hero-pair{gap:1px;background:#ffffff20}.video-box{aspect-ratio:7/4;position:relative;background:#101116;overflow:hidden}.video-box video{display:block;width:100%;height:100%;object-fit:contain}.pair figcaption{display:flex;justify-content:space-between;align-items:center;font-size:13px;padding:14px 17px;background:var(--surface)}.pair figcaption>span:last-child{font-size:11px;color:var(--muted)}.hero-pair figcaption{background:#15161f;justify-content:flex-start;gap:6px}.hero-pair figcaption>span:last-child{margin-left:auto;color:#8b8a9e}.original-dot{background:#b9b7c6}.demo-footer{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:12px 22px;border-top:1px solid #ffffff12;font-size:12px;color:#a2a0b4}.text-button{background:transparent;border:0;font-size:12px;font-weight:600;padding:7px;white-space:nowrap}.demo-footer .text-button{color:#cfc2f6}.hero-footnote{font-size:10px;letter-spacing:.6px;color:#747183;margin-top:17px}.section-heading{margin-bottom:36px}.section-number{display:block;color:var(--purple);margin-bottom:16px;font-size:10px}.section-heading>p{color:var(--muted);max-width:680px;margin-top:15px}.muted-heading{color:#7b7c8b}.overview-grid{display:grid;grid-template-columns:1.2fr 1fr;gap:90px}.lead{font-size:17px;line-height:1.8;color:#4e5263}.lead strong{color:var(--ink)}.principles{display:grid;gap:19px;border-left:1px solid var(--line);padding-left:30px}.principles span{font-size:10px;letter-spacing:1.5px;color:var(--purple);font-weight:700}.principles p{font-size:14px;line-height:1.6;margin-top:4px}.abstract{margin-top:35px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:19px 0}.abstract summary,.protocol summary{cursor:pointer;font-weight:600;font-size:14px;list-style:none;display:flex;justify-content:space-between}.abstract p,.protocol p{padding-top:20px;font-size:14px;color:var(--muted);line-height:1.85}.method-section{background:var(--soft)}.paper-figure{margin:25px 0}.zoom-figure{border:1px solid var(--line);background:white;border-radius:12px;padding:20px;position:relative;width:100%;display:block;overflow:hidden}.zoom-figure>span{position:absolute;bottom:8px;right:12px;padding:4px 8px;background:#ffffffed;color:#60577a;font-size:10px;border-radius:5px}.zoom-figure img{display:block;width:100%}.paper-figure figcaption{text-align:center;font-size:12px;color:var(--muted);margin-top:12px}.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:32px;margin-top:40px}.steps article>span{font-size:12px;color:var(--purple);font-weight:700}.steps h3{font-size:18px;margin:6px 0 10px}.steps p{font-size:13px;color:var(--muted)}.method-note{border-top:1px solid var(--line);padding-top:24px;margin-top:32px;font-size:12px;color:var(--muted)}.gallery-tools{display:flex;align-items:center;justify-content:space-between;gap:20px}.filters{display:flex;gap:5px;flex-wrap:wrap}.filters button,.ablation-tabs button{font-size:12px;background:transparent;border:1px solid transparent;border-radius:7px;padding:9px 13px;color:var(--muted)}.filters button.active,.ablation-tabs button.active{background:#ece7fa;color:#6550af;border-color:#dcd4f2}.count{font-size:11px;white-space:nowrap;color:var(--muted)}.case-strip{display:flex;overflow:auto;gap:10px;padding:17px 0 20px;scrollbar-width:thin;scrollbar-color:#c5bfd4 transparent}.case-thumb{min-width:143px;width:143px;background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:4px;text-align:left;overflow:hidden;flex-shrink:0}.case-thumb.active{border:2px solid var(--purple);padding:3px;background:#f3effb}.case-thumb img{width:100%;aspect-ratio:7/4;object-fit:cover;border-radius:4px;display:block}.case-thumb>span{display:block;font-size:10px;padding:7px 4px 4px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.comparison-shell{border:1px solid var(--line);border-radius:14px;margin-top:15px;padding:26px;background:var(--surface)}.comparison-heading{display:flex;justify-content:space-between;align-items:center;gap:14px}.comparison-heading h3{font-size:24px;letter-spacing:-.7px;margin:6px 0}.comparison-heading p:last-child{font-size:13px;color:var(--muted)}.arrows{display:flex;gap:6px}.arrows button{border:1px solid var(--line);border-radius:50%;background:var(--surface);width:34px;height:34px;font-size:17px}.method-selector{display:flex;align-items:center;gap:14px;margin:25px 0 16px;font-size:12px}.method-selector label{color:var(--muted)}select{border:1px solid var(--line);background:var(--bg);color:var(--ink);border-radius:7px;padding:8px 28px 8px 10px;font-size:13px;max-width:100%}.versus{color:var(--muted);font-size:11px}.ours-pill{display:inline-block;font-size:8px;background:#e8f6f4;color:#218a82;padding:3px 5px;border-radius:3px;vertical-align:middle;margin-left:5px}.comparison-shell figure{border:1px solid var(--line);border-radius:8px;overflow:hidden}.comparison-shell .ours-frame{border-color:#a8d8d6}.player-controls{display:flex;align-items:center;gap:12px;padding-top:17px;flex-wrap:wrap}.compact{font-size:12px;min-height:35px;padding:7px 13px}.player-controls label{font-size:11px;display:flex;align-items:center;gap:6px;color:var(--muted)}.player-controls select{font-size:11px;padding:4px 8px}.playback-note{font-size:10px;color:var(--muted);margin-left:auto;max-width:270px}.variant-note{font-size:11px;color:var(--muted);margin-top:12px}.missing{position:absolute;inset:0;display:grid;place-items:center;color:#bdbacb;padding:30px;font-size:14px;text-align:center}.protocol{border-bottom:1px solid var(--line);padding:20px 0;color:var(--muted)}.protocol summary{font-size:12px}.results-section{background:var(--soft)}.metric-strip{display:grid;grid-template-columns:repeat(3,1fr);margin:35px 0 40px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:28px 0}.metric-strip>div{border-right:1px solid var(--line);padding:0 30px}.metric-strip>div:first-child{padding-left:0}.metric-strip>div:last-child{border:0}.metric-strip strong{display:block;font-family:'Manrope',sans-serif;font-weight:750;font-size:44px;line-height:1.2;color:var(--purple);letter-spacing:-2px}.metric-strip span{display:block;font-size:14px;margin-top:8px}.metric-strip small{color:var(--muted);font-size:11px}.table-wrap{overflow:auto;background:var(--surface);border:1px solid var(--line);border-radius:12px}table{border-collapse:collapse;width:100%;font-size:13px;white-space:nowrap}caption{text-align:left;padding:18px 20px;color:var(--muted);font-size:11px;white-space:normal}th,td{padding:12px 20px;text-align:right;border-top:1px solid var(--line)}th:first-child,td:first-child{text-align:left}th{font-size:11px;letter-spacing:.3px;background:var(--bg)}tr.ours-row{background:#eeebf9;font-weight:700;color:#52428e}td.best{font-weight:800;text-decoration:underline;text-underline-offset:3px}.table-note{font-size:11px;line-height:1.8;color:var(--muted);margin-top:14px}.ablation-tabs{display:flex;gap:7px;flex-wrap:wrap;margin-bottom:22px}.ablation-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.ablation-grid figure{border:1px solid var(--line);border-radius:9px;overflow:hidden}.ablation-grid figcaption{font-size:12px;padding:12px;background:var(--surface);display:flex;justify-content:space-between;gap:5px}.ablation-grid figcaption small{color:var(--muted)}.ablation-footer{display:flex;gap:30px;align-items:center;justify-content:space-between;margin:20px 0 40px}.ablation-footer p{font-size:13px;color:var(--muted);max-width:800px}.ablation-footer button{flex-shrink:0}.analysis-grid{display:grid;grid-template-columns:1fr 1fr;gap:55px;margin-top:70px}.analysis-grid h3{font-size:25px;letter-spacing:-.6px;margin-bottom:12px}.analysis-grid p{font-size:14px;color:var(--muted);min-height:100px}.chart{margin-top:20px;aspect-ratio:1.55;display:grid;place-items:center}.chart img{max-height:100%;object-fit:contain}.closing-section{background:#10111e;color:#eceaf5}.closing-grid{display:grid;grid-template-columns:1fr 1fr;gap:70px}.closing-section .section-number{color:#b2a3db}.closing-section p{font-size:14px;color:#b1afc2}.text-link{display:inline-block;color:#b9a7f1;font-size:13px;margin-top:20px}.citation{display:grid;grid-template-columns:.8fr 1.2fr;gap:60px}.citation h2{font-size:32px}.citation p{font-size:13px;color:var(--muted);margin-top:12px}.citation-box{position:relative;background:var(--soft);padding:35px 22px 20px;border:1px solid var(--line);border-radius:10px}.citation-box>button{position:absolute;right:12px;top:6px;color:var(--purple)}pre{font-size:11px;white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.9}#copy-status{font-size:11px;color:var(--purple)}.footer{border-top:1px solid var(--line);padding-top:28px;padding-bottom:35px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:15px}.footer p{font-size:11px;color:var(--muted)}.footer small{font-size:10px;color:var(--muted);width:100%}.footer small a{text-decoration:underline;text-underline-offset:3px}dialog{max-width:94vw;max-height:92vh;border:0;border-radius:12px;padding:35px 15px 15px;background:white}dialog::backdrop{background:#080815c9;backdrop-filter:blur(6px)}dialog img{max-height:83vh;object-fit:contain}#close-figure{position:absolute;top:0;right:8px;font-size:28px;border:0;background:white;color:#252137}.load-error{padding:20px;border:1px solid #b44;border-radius:8px;margin-top:20px}.dark{--bg:#10111b;--surface:#191a28;--ink:#ecebf4;--muted:#a0a0b5;--line:#2c2d42;--soft:#151623;--purple:#b5a2ed;color-scheme:dark}.dark .lead{color:#b5b3c4}.dark .filters button.active,.dark .ablation-tabs button.active,.dark .case-thumb.active{background:#2c2540;color:#d0bff7}.dark tr.ours-row{background:#2b2540;color:#d4c6f4}.dark .ours-pill{background:#1c3d3d;color:#7bd2ce}.dark .muted-heading{color:#9190a6}
@media(max-width:800px){.wrap{width:calc(100% - 36px)}.section{padding-top:65px;padding-bottom:65px}.nav{height:64px;padding:0 18px}.nav nav{gap:15px;font-size:11px}.nav nav a:nth-child(1),.nav nav a:nth-child(4){display:none}.brand{font-size:17px}.hero{padding-top:42px}.gradient{letter-spacing:-3px}.hero-summary{font-size:20px}.paper-title{font-size:23px}.hero-demo{margin-top:35px}.demo-top{padding:13px}.overview-grid{gap:30px;grid-template-columns:1fr}.principles{padding-left:20px}.steps{grid-template-columns:repeat(2,1fr);gap:25px}.comparison-shell{padding:16px}.comparison-heading h3{font-size:21px}.method-selector{flex-wrap:wrap;gap:8px}.method-selector label{width:100%}.pair figcaption{padding:10px;font-size:11px}.pair{gap:8px}.metric-strip>div{padding:0 15px}.metric-strip strong{font-size:35px}.metric-strip span{font-size:12px}.metric-strip small{font-size:10px}.analysis-grid{gap:25px}.analysis-grid p{min-height:160px}.closing-grid,.citation{grid-template-columns:1fr;gap:30px}.hero-pair figcaption>span:last-child{display:none}.demo-footer{padding:10px 13px;font-size:11px}.playback-note{margin-left:0;max-width:none;flex-basis:100%}.zoom-figure{padding:12px}.ablation-footer{align-items:flex-start;flex-direction:column;gap:12px}.ablation-grid figcaption{font-size:10px;flex-direction:column}.desktop-br{display:none}}
@media(max-width:500px){.nav nav a{font-size:10px}.nav nav{gap:12px}.brand .mark{font-size:24px}.theme-toggle{width:28px;height:28px;font-size:17px}.hero h1 .paper-title{font-size:20px}.hero-summary>span{font-size:13px}.demo-description{display:none}.eyebrow{font-size:9px;letter-spacing:1.5px}.pair:not(.hero-pair){grid-template-columns:1fr}.hero-pair .video-box{aspect-ratio:1.4}.hero-pair figcaption{font-size:10px}.hero-pair .ours-dot,.hero-pair .original-dot{width:5px;height:5px;margin:0}.demo-footer>span{max-width:190px}.section-heading>p{font-size:14px}.gallery-tools{align-items:flex-start}.filters button{font-size:10px;padding:7px 8px}.count{padding-top:8px;font-size:10px}.case-thumb{min-width:120px;width:120px}.metric-strip strong{font-size:30px}.metric-strip>div{padding:0 10px}.metric-strip small{display:block;line-height:1.5}.ablation-grid{grid-template-columns:1fr}.ablation-grid figcaption{font-size:13px;flex-direction:row}.analysis-grid{grid-template-columns:1fr;gap:40px}.analysis-grid p{min-height:0}.steps p{font-size:12px}.hero-actions .button{font-size:12px;padding:9px 14px}.comparison-shell .video-box{aspect-ratio:7/4}.footer{display:block}.footer p{margin-top:12px}.footer small{display:block;margin-top:16px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
tbody th{background:transparent;font-size:13px;font-weight:500;letter-spacing:0}tr.ours-row th{font-weight:750}
/* All-method comparison revision: one playback control per case, no video clocks. */
.method-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.method-grid figure{min-width:0;border:1px solid var(--line);border-radius:9px;overflow:hidden;background:var(--surface)}.method-grid figcaption{padding:11px 13px;font-size:12px;font-weight:600;display:flex;align-items:center;gap:8px}.method-grid .ours-frame,.ablation-grid .ours-frame{border-color:var(--cyan)}.method-grid .video-box{aspect-ratio:7/4}.case-playbar{display:flex;align-items:center;gap:14px;margin:22px 0 18px;flex-wrap:wrap}.case-playbar>span{font-size:11px;color:var(--muted)}.play-status{font-size:11px;color:var(--muted);margin:0}.play-status:empty{display:none}.button:disabled{cursor:wait;opacity:.7}.ablation-grid figcaption{display:flex;align-items:center;justify-content:flex-start;gap:8px}.video-box video::-webkit-media-controls{display:none!important}.video-box video{pointer-events:none}.ablation-footer{flex-wrap:wrap}.ablation-footer #ablation-status{flex-basis:100%}
@media(max-width:900px){.method-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:520px){.method-grid{grid-template-columns:1fr}.case-playbar{gap:9px}.case-playbar>span{font-size:10px}.method-grid figcaption{font-size:12px}}
/* Crop the two letterboxed methods to the shared content viewport.
   The 720x480 sources become an approximately 714x408 center viewport:
   encoded bars (up to 36 px) and player-added side borders are clipped.
   Uniform scaling preserves geometry; original video assets stay intact. */
.method-grid figure[data-method="CogVideoX-5B"] video,
.method-grid figure[data-method="VLIPP"] video,
.method-grid figure[data-method="VLIPP_newcase"] video{object-fit:cover;object-position:center;transform:scale(1.009)}
.ablation-shell{margin-bottom:40px}
.variant-note:empty{display:none}.abstract-heading{text-align:center;margin-bottom:26px}.abstract-prose{max-width:940px;margin:0 auto;color:var(--ink);font-size:16px;line-height:1.9}.introduction-figure{margin-top:40px}.abstract-prose em{font-style:italic}.abstract-prose strong{font-weight:700}@media(max-width:600px){.abstract-prose{font-size:14px;line-height:1.8}}
.author-list{display:flex;flex-wrap:wrap;justify-content:center;column-gap:18px;row-gap:6px;max-width:1100px;margin:22px auto 0;font-size:16px;color:#d9d4e8}.author-list>span{white-space:nowrap}.author-list sup{font-size:10px;margin-left:3px;color:#bba9e2}.affiliations{display:flex;flex-wrap:wrap;justify-content:center;gap:6px 20px;margin:12px auto 0;max-width:1040px;color:#a9a6bb;font-size:12px}.affiliations>span{white-space:nowrap}.affiliations sup{font-size:9px;margin-right:4px;color:#bba9e2}.affiliations a:hover{color:#e7dcff}@media(max-width:600px){.author-list{font-size:13px;column-gap:12px;row-gap:7px}.affiliations{font-size:11px;gap:5px 13px}}