:root{color-scheme:light;--bg:#f5f3ee;--paper:#fffefa;--ink:#24292c;--muted:#696d6d;--line:#deded6;--accent:#c54624;--accent-dark:#a63519;--green:#287653;--mono:Consolas,"SFMono-Regular",monospace;font-family:Inter,"Segoe UI","Noto Sans TC","Microsoft JhengHei",sans-serif;font-size:16px;color:var(--ink);background:var(--bg)}
*{box-sizing:border-box}
body{margin:0;line-height:1.6}
button,input,select{font:inherit}
button,select,summary,input[type=range],input[type=color]{cursor:pointer}
button,a,input,select,summary{touch-action:manipulation}
button{transition:background .15s,transform .15s}
button:hover:not(:disabled){transform:translateY(-1px)}
button:disabled{cursor:not-allowed;opacity:.48}
button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #db7c48;outline-offset:4px}
fieldset{border:0;margin:0;padding:0;min-width:0}
h1,h2,h3,p{margin:0}
h2{font-size:18px;font-weight:650}
h3{font-size:17px;font-weight:650}
a{color:inherit;text-decoration:none}
.topbar{height:80px;padding:0 4%;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:12px;font-size:17px;letter-spacing:-.5px}
.brand b{font-weight:500;color:var(--muted)}
.brand-mark{display:grid;place-items:center;width:33px;height:33px;background:var(--accent);color:var(--on-accent);border-radius:8px;font-size:27px;line-height:1}
.tag{font:14px var(--mono);letter-spacing:1px;color:var(--accent);border:1px solid var(--accent-line);border-radius:4px;padding:4px 6px}
.neutral{border-color:var(--line);color:var(--muted);letter-spacing:0}
.status-dot{display:inline-block;width:7px;height:7px;border-radius:50%;background:#929895}
main{max-width:1800px;margin:auto;padding:42px 4% 24px}
.intro{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:32px}
.eyebrow{font:14px var(--mono);letter-spacing:2px;color:var(--muted);margin-bottom:10px}
h1{font-size:clamp(26px,2.9vw,40px);font-weight:650;letter-spacing:-1.4px;line-height:1.3}
.subtitle{margin-top:12px;color:var(--muted);font-size:16px}
.text-link{font-size:16px;white-space:nowrap;padding:10px 0;border-bottom:1px solid var(--control-line)}
.text-link span[aria-hidden]{padding-left:8px}
.workspace{display:grid;grid-template-columns:340px minmax(360px,1fr) 340px;gap:24px;align-items:start}
.panel{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:24px}
.section-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:24px}
.section-heading h2{line-height:1.5}
.section-heading .text-button{flex-shrink:0}
.step{font:14px var(--mono);color:var(--accent);margin-right:8px}
.text-button{border:0;background:transparent;padding:8px 0;color:var(--muted);font-size:14px;min-height:44px}
.text-button:hover{color:var(--accent)}
.dropzone{position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;padding:16px 6px;border:1px dashed var(--control-line);border-radius:8px;background:var(--soft);cursor:pointer;text-align:center;min-height:157px}
.dropzone:focus-within,.dropzone.dragover{outline:2px solid var(--accent);background:var(--accent-soft)}
.dropzone strong{font-size:16px}
.dropzone span:not(.upload-symbol){font-size:14px;color:var(--muted)}
.upload-symbol{font-size:28px;color:var(--accent);height:31px}
.micro{font-size:14px!important;line-height:1.7;color:var(--muted)}
.source-row{display:flex;align-items:center;gap:10px;margin-top:14px;min-width:0}
.file-icon{font:13px var(--mono);background:var(--inset);border:1px solid var(--line);border-radius:4px;padding:12px 5px}
.source-row>div{flex:1;min-width:0}
.source-row strong{display:block;font-size:16px;white-space:nowrap;text-overflow:ellipsis;overflow:hidden}
.source-row div span{display:block;font-size:14px;color:var(--muted);margin-top:4px}
.source-row button{white-space:nowrap}
hr{border:0;border-top:1px solid var(--line);margin:22px 0}
.field-label{display:block;font-size:14px;font-weight:600;margin:15px 0 8px}
select,input[type=number]{width:100%;height:46px;border:1px solid var(--line);border-radius:6px;color:var(--ink);background:var(--paper);padding:0 9px;font-size:16px}
select{padding-right:6px;min-width:0}
.two-col{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:16px}
.range-heading{display:flex;justify-content:space-between;align-items:center;gap:8px;font-size:14px;flex-wrap:wrap;margin:20px 0 10px}
.range-heading output{font:14px var(--mono);color:var(--muted)}
input[type=range]{width:100%;height:18px;margin:0;accent-color:var(--accent)}
.color-control{display:flex;align-items:center;height:38px;border:1px solid var(--line);border-radius:6px;padding:0 5px;gap:6px}
.color-control input{border:0;padding:0;background:none;width:24px;height:27px}
.color-control output{font:13px var(--mono);color:var(--muted)}
.check-row{display:flex;align-items:center;gap:6px;font-size:14px;margin-top:18px}
.check-row input{accent-color:var(--accent);width:18px;height:18px}
summary{font-size:14px;min-height:44px;display:list-item;padding:10px 0;user-select:none}
.fine-tune{border-top:1px solid var(--line);margin-top:18px;padding-top:4px}
.fine-tune .range-heading{margin-top:12px}
.preview-panel{border:1px solid var(--line);border-radius:12px;background:var(--paper);overflow:hidden;min-width:0}
.preview-top{padding:22px 24px;display:flex;align-items:center;justify-content:space-between}
.live-label{display:flex;align-items:center;gap:6px;font:14px var(--mono);color:var(--muted)}
.live-label>span:not([data-i18n]){width:5px;height:5px;background:var(--accent);border-radius:50%}
.preview-stage{position:relative;min-height:372px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:28px;padding:28px 12px 22px;background-color:var(--stage);background-image:radial-gradient(var(--stage-dot) .7px,transparent .7px);background-size:16px 16px;border-block:1px solid var(--line)}
.measurement{font:14px var(--mono);letter-spacing:1px;color:var(--muted)}
.board-mock{width:420px;position:relative;display:flex;align-items:center;justify-content:center;padding:23px 34px 27px 31px;background:#252a2b;border:1px solid #48504f;border-radius:12px;box-shadow:0 12px 17px #15252122,0 3px 1px #171f21, inset 0 0 0 4px #303637;max-width:96%}
.board-mock:before,.board-mock:after{content:"";position:absolute;left:44px;right:44px;height:4px;background:repeating-linear-gradient(to right,#b3a367 0 4px,transparent 4px 11px);top:8px}
.board-mock:after{top:auto;bottom:8px}
.screen-bezel{flex:1;min-width:0;padding:5px;background:#080c0e;border-radius:4px;box-shadow:inset 0 0 2px #000;border:1px solid #4c5352}
#screen{display:block;position:absolute;left:50%;top:50%;max-width:none;image-rendering:pixelated;background:#101c29}
.board-port{position:absolute;width:19px;height:39px;background:linear-gradient(90deg,#6b7374,#c2c5bf,#616d6c);left:-10px;top:calc(50% - 20px);border:1px solid #434e4b;border-radius:4px}
.board-port:after{content:"";display:block;width:4px;height:26px;background:#242c2c;margin:5px 2px}
.board-buttons{position:absolute;right:9px;top:20%;bottom:20%;display:flex;flex-direction:column;justify-content:space-between}
.board-buttons i{display:block;width:12px;height:22px;background:#9b9b8b;border:3px solid #50584f;border-radius:2px;box-shadow:0 1px 1px #000}
.board-wordmark{position:absolute;bottom:16px;left:9px;font:6px var(--mono);color:#bec8b0;writing-mode:vertical-rl;letter-spacing:1px}
.screw{position:absolute;width:8px;height:8px;border:2px solid #a59258;border-radius:50%;left:11px;background:#171d1c}
.screw.top{top:12px}
.screw.bottom{bottom:12px}
.preview-caption{font:14px var(--mono);color:var(--muted)}
.preview-toolbar{display:flex;align-items:center;gap:8px;padding:14px 22px;border-bottom:1px solid var(--line)}
.play-button,.icon-button{height:44px;min-width:44px;border:1px solid var(--line);background:var(--paper);border-radius:6px;font-size:18px}
.play-button{background:var(--ink);color:var(--paper);border-color:var(--ink);font-size:16px}
.icon-button{border:0;color:var(--muted)}
.timecode{font:14px var(--mono);color:var(--muted)}
.timeline{padding:24px}
.timeline-heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px}
.timeline-heading>span{font:14px var(--mono);color:var(--muted)}
.filmstrip{display:flex;gap:4px;overflow:hidden;border-radius:5px;background:var(--inset);min-height:48px;margin-bottom:8px;padding:4px}
.filmstrip canvas{width:calc((100% - 28px)/8);height:44px;object-fit:cover;image-rendering:pixelated;border-radius:3px}
.playback-controls{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-bottom:12px}
.playback-controls input{padding:0 10px}
.help-text{font-size:16px;line-height:1.8;color:var(--muted);margin:12px 0}
.button{border-radius:6px;padding:12px 14px;font-size:16px;font-weight:550;min-height:46px;display:flex;align-items:center;justify-content:center;gap:8px}
.button.full{width:100%}
.primary{border:1px solid var(--accent);background:var(--accent);color:var(--on-accent)}
.primary:hover:not(:disabled){background:var(--accent-dark)}
.secondary{border:1px solid var(--control-line);background:var(--paper);color:var(--ink)}
.secondary:hover:not(:disabled){background:var(--hover)}
.subtle{border:1px solid transparent;color:var(--muted);background:transparent;font-size:14px}
.connection-badge{display:flex;align-items:center;gap:8px;font-size:16px;background:var(--inset);padding:11px 12px;border-radius:6px}
.connection-badge.connected{background:var(--success-bg);color:var(--success-text)}
.connection-badge.connected .status-dot{background:var(--green)}
.output-heading{display:flex;align-items:center;justify-content:space-between}
.stats{margin:17px 0 22px}
.stats>div{display:flex;justify-content:space-between;gap:12px;margin-bottom:14px;font-size:14px}
.stats dt{color:var(--muted)}
.stats dd{text-align:right;font:14px var(--mono);margin:0}
.device-panel>.micro{margin:5px 0 16px}
.status-message{font-size:14px;line-height:1.7;padding:12px;border-left:2px solid var(--control-line);background:var(--soft);overflow-wrap:anywhere;margin:14px 0}
.status-message.error{background:var(--error-bg);border-color:#c54624;color:var(--error-text)}
.status-message.success{background:var(--success-bg);border-color:var(--green);color:var(--success-text)}
.firmware-section{border-top:1px solid var(--line);margin-top:22px;padding-top:10px}
.firmware-section summary{font-size:16px;font-weight:600}
.firmware-section .help-text{font-size:14px;margin:6px 0 12px}
.firmware-section .micro{margin-top:9px}
.log-section{margin-top:12px;color:var(--muted)}
#log{font:14px/1.6 var(--mono);max-height:180px;overflow:auto;white-space:pre-wrap;word-break:break-all;background:#242a2b;color:#cdd8cd;border-radius:6px;padding:12px}
.transfer-status{margin-top:16px}
.transfer-status>div{display:flex;justify-content:space-between;font-size:14px}
.transfer-status strong{font-weight:500}
progress{width:100%;height:7px;accent-color:var(--accent);margin-top:8px}
footer{display:flex;justify-content:space-between;gap:20px;font-size:14px;color:var(--muted);padding-top:23px}
.notice{background:var(--notice-bg);color:var(--notice-text);border:1px solid var(--notice-line);padding:14px 18px;margin-bottom:20px;border-radius:7px;font-size:16px;line-height:1.7}
dialog{border:1px solid var(--line);border-radius:12px;background:var(--paper);padding:30px;max-width:560px;width:calc(100% - 32px);color:var(--ink);box-shadow:0 24px 100px #0003}
dialog::backdrop{background:#111a20a6}
dialog h2{font-size:23px;margin:12px 0 20px}
dialog p{font-size:16px;line-height:1.8;margin:12px 0}
.dialog-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:24px}
.sr-only{position:absolute;width:1px;height:1px;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
[hidden]{display:none!important}

@media(min-width:1600px){.workspace{grid-template-columns:360px minmax(400px,1fr) 360px}
.preview-stage{min-height:408px}
.preview-panel{margin-bottom:20px}
}

@media(max-width:1320px){main{padding-inline:25px}
.workspace{grid-template-columns:330px minmax(0,1fr);gap:16px}
.device-panel{grid-column:1/-1;display:block}
.intro .text-link{font-size:14px}
.board-mock{padding-inline:28px}
}

@media(max-width:820px){.topbar{height:65px;padding:0 18px}
.brand{font-size:16px;gap:7px}
main{padding:28px 16px 20px}
.intro{display:block;margin-bottom:24px}
.intro .text-link{display:inline-block;margin-top:12px}
.workspace{display:flex;flex-direction:column;gap:16px}
.panel,.preview-panel{width:100%}
.preview-panel{order:0}
.editor-panel{order:1}
.device-panel{order:2;display:block}
.preview-stage{min-height:310px}
.preview-top{padding:18px}
.board-mock{max-width:92%}
.preview-caption{font-size:13px}
.timeline{padding:18px}
.playback-controls{gap:7px;grid-template-columns:1fr 1fr}
.preview-toolbar{padding:12px 18px}
.device-panel hr{display:block}
footer{display:block;line-height:1.8}
footer>span{display:block}
h1{letter-spacing:-1px}
.dialog-actions .button{padding:10px}
.section-heading{margin-bottom:16px}
}

@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}
}

.compression-controls{margin-top:16px;padding:16px;background:var(--inset);border-radius:6px}
.compression-controls .check-row{margin:0 0 8px;font-size:16px}
.compression-controls .button{margin:12px 0 8px}
.fits{color:var(--green)}
.too-large{color:var(--error-text)}

/* Theme tokens describe UI surfaces; the board and GIF retain their own colors. */
:root{--on-accent:#fff;--accent-line:#e6c1ad;--control-line:#b7b6ad;--soft:#f9f8f4;--accent-soft:#fff0e5;--inset:#f0eee8;--stage:#e9e9e2;--stage-dot:#c5c8bf;--hover:#f1f1e9;--success-bg:#ecf4ec;--success-text:#235b42;--error-bg:#fff0eb;--error-text:#a22c17;--notice-bg:#fff0dd;--notice-text:#80501c;--notice-line:#e6caa5}

:root[data-theme="dark"]{color-scheme:dark;--bg:#1c1e1d;--paper:#252826;--ink:#edf0e9;--muted:#b3bbb4;--line:#424941;--accent:#efa17c;--accent-dark:#f7b595;--on-accent:#302019;--green:#8acc9b;--accent-line:#855c47;--control-line:#687168;--soft:#2b302c;--accent-soft:#3f3027;--inset:#2e342f;--stage:#202622;--stage-dot:#3e4940;--hover:#363e36;--success-bg:#263c30;--success-text:#a1dfb3;--error-bg:#412d27;--error-text:#ffb29b;--notice-bg:#3b3326;--notice-text:#eacd99;--notice-line:#726044}

.header-tools{display:flex;align-items:center;gap:8px}

.tool-button{display:inline-flex;align-items:center;justify-content:center;gap:5px;min-width:44px;min-height:44px;padding:10px;border:1px solid transparent;border-radius:8px;background:transparent;color:var(--muted);flex-shrink:0}

.tool-button:hover:not(:disabled){background:var(--inset);border-color:var(--line);color:var(--ink);transform:none}

.tool-button svg{width:21px;height:21px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}

.language-button{font-size:16px;font-weight:600;padding-inline:12px}

.language-divider{color:var(--control-line);font-weight:400}

html[lang="zh-Hant"] .language-button [lang="zh-Hant"],html[lang="en"] .language-button [lang="en"]{color:var(--ink);text-decoration:underline;text-underline-offset:5px;text-decoration-color:var(--accent)}

.sun-icon,[data-theme="dark"] .moon-icon{display:none}

[data-theme="dark"] .sun-icon{display:block}

.check-row>span[data-i18n]{font-size:inherit;color:inherit;margin-left:0}

.check-row>span[data-i18n]:last-child:not(:first-of-type){margin-left:auto;font-size:14px;color:var(--muted)}

dialog{max-height:calc(100dvh - 32px);overflow-y:auto;overscroll-behavior:contain}

body:has(dialog[open]){overflow:hidden}

#help-dialog{max-width:680px;padding:28px 32px}

.help-dialog-heading{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:24px}

.help-dialog-heading .eyebrow{margin-bottom:6px;color:var(--accent)}

.help-dialog-heading h2{margin:0;font-size:24px}

.help-dialog-heading .tool-button{margin:-8px -12px 0 0}

#help-dialog h3{font-size:16px}

.help-steps{padding-left:25px;margin:18px 0 24px}

.help-steps li{padding-left:7px;margin-bottom:16px;font-size:16px;line-height:1.65}

.help-steps li::marker{color:var(--accent);font-family:var(--mono)}

.help-steps strong{font-weight:650}

.help-steps p{font-size:16px;line-height:1.8;color:var(--muted);margin:3px 0 0}

.help-notes{background:var(--inset);border-radius:8px;padding:18px 20px}

.help-notes ul{margin:10px 0 0;padding-left:17px}

.help-notes li{font-size:16px;line-height:1.8;color:var(--muted);margin:8px 0}

.help-privacy{font-size:14px;color:var(--muted);margin:16px 0 0}

#help-dialog .dialog-actions{margin-top:18px}

#help-dialog .button{min-width:110px}

html[lang="en"] .eyebrow{letter-spacing:1.4px}


@media(max-width:820px){.header-tools{gap:2px}
.language-button{padding-inline:7px}
.topbar{padding-inline:16px}
#help-dialog{padding:24px 20px}
.help-notes{padding:14px 16px}
.help-dialog-heading{margin-bottom:20px}
}

@media(max-width:360px){.brand-mark{display:none}
.brand{font-size:16px}
.header-tools{gap:0}
}

.screen-surface{position:relative;width:100%;aspect-ratio:240 / 135;overflow:hidden}

.orientation-note{padding:14px 24px 0;color:var(--muted);font-size:14px;line-height:1.6}

.preview-top,.timeline-heading,.output-heading{gap:12px;flex-wrap:wrap}

.preview-toolbar{flex-wrap:wrap}


.source-row{flex-wrap:wrap;gap:10px}

.source-row #source-meta{overflow-wrap:anywhere;line-height:1.5}

.color-control{gap:8px}
.color-control output{font-size:13px}

.check-row{flex-wrap:wrap;min-height:32px}


.stats>div{align-items:baseline;line-height:1.7}

.stats dt{flex:1;min-width:0}
.stats dd{flex-shrink:0}

.dropzone{padding:20px 10px;min-height:180px}

.help-privacy{line-height:1.7}

@media(max-width:1320px) and (min-width:821px){.device-panel{padding:28px}
.device-panel .help-text,.device-panel>.micro{max-width:72ch}
}

@media(max-width:820px){.panel{padding:24px}
.orientation-note{padding-inline:18px}
.board-mock{padding:23px 30px 27px}
.preview-top{gap:10px}
.brand{font-size:18px}
.language-button{font-size:14px}
.topbar{height:72px}
}

@media(max-width:380px){.panel{padding:20px}
.two-col{gap:10px}
.color-control{gap:4px}
.brand{font-size:16px}
.header-tools{gap:0}
.timecode{font-size:13px}
}