:root {
  color-scheme: light;
  --paper: #faf9f6;
  --ink: #252339;
  --muted: #605e71;
  --line: #e6e2e9;
  --accent: #5945d6;
  --accent-dark: #4835b9;
  --tint: #ede8ff;
  --white: #fff;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-synthesis: none;
  color: var(--ink);
  background: var(--paper);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; min-height: 100vh; display: flex; flex-direction: column; }
main { flex: 1; }
button, input { font: inherit; }
button { cursor: pointer; }
button:disabled { cursor: default; }
:focus-visible { outline: 3px solid #816cf4; outline-offset: 4px; }
p, h1, figure { margin: 0; }
.symbol-bank { position: absolute; width: 0; height: 0; overflow: hidden; }
.icon { width: 1.125rem; height: 1.125rem; flex: none; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.frame { width: min(100% - 80px, 1160px); margin-inline: auto; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }

.masthead { border-bottom: 1px solid var(--line); }
.masthead-inner { height: 72px; display: flex; align-items: center; justify-content: space-between; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-size: 1.22rem; letter-spacing: -.045em; font-weight: 770; color: var(--ink); text-decoration: none; }
.brand img { display: block; }
.brand-accent { color: var(--accent-dark); }
.language { display: flex; align-items: center; gap: 7px; padding: 0 12px; min-height: 40px; border: 1px solid var(--line); background: var(--white); border-radius: 10px; font-size: .83rem; font-weight: 650; color: var(--ink); }
.language:hover, .secondary:hover { background: #f3f0fb; border-color: #cec4eb; }
.language .icon { width: 16px; height: 16px; color: var(--accent-dark); }

.hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.14fr); gap: clamp(30px, 5vw, 82px); align-items: center; padding-block: clamp(42px, 6.4vw, 88px) 32px; }
.intro { min-width: 0; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; color: #4938a8; background: var(--tint); border-radius: 999px; padding: 7px 12px; font-weight: 780; letter-spacing: .115em; font-size: .69rem; }
.eyebrow-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }
.intro h1 { margin-block: 17px; font-size: clamp(2.8rem, 5.7vw, 5rem); font-weight: 780; letter-spacing: -.077em; line-height: .99; }
.intro h1 span { display: block; }
.hero-accent { color: var(--accent); }
.lede { max-width: 30ch; font-size: clamp(1.04rem, 1.55vw, 1.22rem); line-height: 1.55; color: var(--muted); }
:lang(zh-CN) .intro h1 { font-size: clamp(2.45rem, 5.2vw, 4.35rem); line-height: 1.14; letter-spacing: -.06em; }
:lang(zh-CN) .eyebrow { letter-spacing: .08em; }

.drop-target { max-width: 432px; margin-top: 24px; padding: 20px 16px 17px; text-align: center; border: 1.5px dashed #c9bee7; background: #f5f2fd; border-radius: 18px; transition: background .18s ease, border-color .18s ease; }
.drop-target.dragging { background: #e9e1ff; border-color: var(--accent); }
.button { min-height: 46px; padding: 0 17px; display: inline-flex; align-items: center; justify-content: center; gap: 8px; border: 1px solid transparent; border-radius: 12px; font-weight: 690; font-size: .94rem; white-space: nowrap; }
.primary { background: var(--accent); color: var(--white); box-shadow: 0 3px 0 #4633ac; }
.primary:hover { background: var(--accent-dark); }
.primary:active { box-shadow: none; transform: translateY(2px); }
.primary:disabled { background: #e5dff7; color: #665687; box-shadow: none; transform: none; }
.upload { min-height: 52px; padding-inline: 22px; }
.secondary { color: var(--ink); border-color: var(--line); background: var(--white); }
.secondary:disabled, .tool-button:disabled { color: #79778b; background: #f6f5f9; }
.drop-prompt { margin-top: 12px; font-size: .84rem; color: var(--muted); }
.file-note { margin-top: 6px; font-size: .73rem; color: var(--muted); }
.sample-row { margin-top: 8px; min-height: 42px; }
.sample-button { display: inline-flex; align-items: center; gap: 7px; min-height: 40px; padding: 0 2px; font-size: .86rem; font-weight: 710; color: var(--accent-dark); background: none; border: 0; border-radius: 4px; }
.sample-button:hover span { text-decoration: underline; text-underline-offset: 4px; }
.sample-button:disabled { opacity: .65; }

.demo-card { min-width: 0; padding: 15px; background: var(--white); border: 1px solid var(--line); border-radius: 25px; box-shadow: 0 20px 55px -32px #32236565; }
.demo-top { display: flex; justify-content: space-between; align-items: center; gap: 10px; min-height: 26px; margin: 0 2px 11px; }
.demo-title { display: inline-flex; align-items: center; gap: 7px; font-size: .84rem; font-weight: 700; }
.demo-title .icon { width: 15px; height: 15px; color: var(--accent); }
.demo-tag { padding: 4px 7px; border-radius: 6px; background: #f1eef8; color: #605583; font-size: .62rem; letter-spacing: .1em; font-weight: 760; }
.comparison { --split: 53%; position: relative; overflow: hidden; aspect-ratio: 960 / 740; border-radius: 14px; background: #c5d9d6; }
.comparison img { position: absolute; display: block; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.before-image { clip-path: inset(0 calc(100% - var(--split)) 0 0); }
.image-tag { position: absolute; top: 11px; color: #fff; background: #232137cc; padding: 5px 9px; border-radius: 6px; font-size: .72rem; font-weight: 670; pointer-events: none; }
.image-tag-before { left: 11px; }
.image-tag-after { right: 11px; }
.divider { position: absolute; inset-block: 0; left: var(--split); width: 2px; translate: -50% 0; background: #fff; box-shadow: 0 0 6px #30254836; pointer-events: none; }
.divider span { display: grid; place-items: center; position: absolute; top: 50%; left: 50%; translate: -50% -50%; width: 39px; height: 39px; border-radius: 50%; background: #fff; color: var(--accent-dark); box-shadow: 0 2px 10px #30254835; }
.compare-slider { position: absolute; inset: 0; width: 100%; height: 100%; margin: 0; appearance: none; opacity: 0; cursor: ew-resize; touch-action: pan-y; }
.compare-slider::-webkit-slider-thumb { appearance: none; width: 1px; height: 1px; }
.compare-slider::-moz-range-thumb { width: 1px; height: 1px; border: 0; }
.comparison:focus-within { outline: 3px solid #816cf4; outline-offset: 4px; }
.demo-bottom { padding: 12px 0 0; text-align: center; font-size: .76rem; color: var(--muted); }
.privacy { display: flex; align-items: center; justify-content: center; gap: 8px; width: fit-content; max-width: 100%; margin: 0 auto 28px; padding: 10px 14px; border: 1px solid #e8e4f0; background: #f1eef6; border-radius: 999px; color: #504762; font-size: .82rem; }
.privacy .icon { color: var(--accent-dark); }

.editor { max-width: 980px; margin: 32px auto 24px; }
.editor-heading { display: flex; justify-content: space-between; align-items: end; gap: 16px; margin-bottom: 18px; }
.editor-heading h1 { font-size: clamp(2rem, 4.8vw, 3rem); font-weight: 780; letter-spacing: -.055em; line-height: 1.1; }
.editor-instruction { margin-top: 5px; color: var(--muted); line-height: 1.45; font-size: .9rem; }
.workspace { border: 1px solid var(--line); border-radius: 18px; background: var(--white); box-shadow: 0 14px 40px -29px #32236550; }
.editor-toolbar, .editor-actions { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 10px 14px; }
.editor-toolbar { border-bottom: 1px solid var(--line); }
.brush-control, .editor-tools, .action-buttons { display: flex; align-items: center; gap: 8px; }
.brush-control { font-size: .83rem; font-weight: 650; }
.brush-control .icon { color: var(--accent-dark); }
.brush-control input { width: clamp(70px, 15vw, 132px); min-height: 30px; accent-color: var(--accent); cursor: pointer; }
.brush-control output { min-width: 40px; color: var(--muted); font-size: .74rem; font-variant-numeric: tabular-nums; }
.tool-button { display: inline-flex; min-height: 40px; align-items: center; gap: 6px; padding: 0 10px; border: 1px solid transparent; border-radius: 8px; background: #f1eef8; color: var(--ink); font-weight: 650; font-size: .82rem; }
.tool-button:hover:not(:disabled), .tool-button[aria-pressed="true"] { background: var(--tint); color: var(--accent-dark); border-color: #cfc3f5; }
.stage { display: grid; place-items: center; padding: 14px; min-height: 160px; background-color: #ece9f3; background-image: radial-gradient(#b8afca85 1px, transparent 1px); background-size: 15px 15px; }
.image-stack { position: relative; width: min(100%, calc(min(56vh, 600px) * var(--aspect, 1))); box-shadow: 0 3px 18px #27203820; background: #fff repeating-conic-gradient(#eceaf1 0% 25%, #fff 0% 50%) 50% / 16px 16px; }
#photo-canvas { display: block; width: 100%; height: auto; }
#mask-canvas, #reference-image { position: absolute; inset: 0; width: 100%; height: 100%; }
#mask-canvas { opacity: .56; touch-action: none; cursor: none; }
#mask-canvas:focus-visible { opacity: .75; }
#reference-image { display: none; pointer-events: none; }
.image-stack[data-original="true"] #reference-image { display: block; }
.image-stack[data-original="true"] #photo-canvas, .image-stack[data-original="true"] #mask-canvas { visibility: hidden; }
.original-tag { display: none; position: absolute; top: 8px; left: 8px; border-radius: 7px; padding: 5px 8px; font-weight: 650; font-size: .74rem; color: #fff; background: #232137cc; }
.image-stack[data-original="true"] .original-tag { display: block; }
.brush-ring { position: absolute; pointer-events: none; width: var(--brush-size, 36px); height: var(--brush-size, 36px); border: 1.5px solid #fff; border-radius: 50%; box-shadow: 0 0 0 1px #392280bc; transform: translate(-50%, -50%); }
.editor-actions { border-top: 1px solid var(--line); min-height: 69px; }
.editor-meta { min-width: 0; overflow-wrap: anywhere; }
#photo-details, .editor-tip { color: var(--muted); font-size: .76rem; line-height: 1.4; }
.editor-tip { margin-top: 10px; }
.message { font-size: .81rem; line-height: 1.4; color: #4e4173; }
.message[data-error="true"] { color: #a1263b; }
.message:empty { display: none; }
.noscript { padding-block: 12px; color: #a1263b; }
.footer { display: flex; justify-content: space-between; gap: 10px; padding-block: 18px; border-top: 1px solid var(--line); color: var(--muted); font-size: .75rem; }
.footer span:first-child { font-weight: 690; }

@media (max-width: 840px) {
  .frame { width: calc(100% - 48px); }
  .hero { gap: 27px; }
}
@media (max-width: 680px) {
  .frame { width: calc(100% - 32px); }
  .masthead-inner { height: 60px; }
  .brand img { width: 34px; height: 34px; }
  .hero { grid-template-columns: 1fr; gap: 21px; padding-block: 29px 19px; }
  .intro { text-align: center; }
  .intro h1 { margin-block: 12px; font-size: clamp(2.55rem, 10vw, 4.1rem); }
  :lang(zh-CN) .intro h1 { font-size: clamp(2.45rem, 9.5vw, 3.6rem); }
  .lede, .drop-target { margin-inline: auto; }
  .drop-target { margin-top: 16px; padding: 13px 12px 12px; }
  .drop-prompt { display: none; }
  .file-note { margin-top: 9px; }
  .sample-row { margin-top: 4px; min-height: 36px; }
  .demo-card { width: min(100%, 480px); margin-inline: auto; padding: 10px; border-radius: 18px; }
  .demo-top { margin-bottom: 8px; }
  .demo-bottom { padding-top: 8px; }
  .privacy { margin-bottom: 18px; font-size: .75rem; }
  .editor { margin-top: 21px; }
  .editor-heading { align-items: start; gap: 8px; }
  .editor-heading .button { padding-inline: 9px; font-size: .78rem; }
  .editor-toolbar { flex-wrap: wrap; justify-content: space-between; gap: 4px 10px; padding: 6px 8px; }
  .editor-tools { gap: 5px; }
  .tool-button { padding-inline: 7px; }
  .stage { min-height: 130px; padding: 7px; }
  .editor-actions { flex-wrap: wrap-reverse; justify-content: flex-start; gap: 10px; padding: 9px; }
  .action-buttons { display: grid; grid-template-columns: 1fr 1.3fr; width: 100%; }
  .action-buttons .button { padding-inline: 7px; }
  .editor-meta { flex-basis: 100%; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; }
}

#ai-dialog {
  width: min(100% - 32px, 440px);
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 18px;
  color: var(--ink);
  background: var(--white);
}
#ai-dialog::backdrop { background: #25233988; }
#ai-dialog h2 { margin: 0 0 8px; }
#ai-dialog p { margin-bottom: 16px; color: var(--muted); line-height: 1.45; }
#ai-dialog label { display: block; font-weight: 650; font-size: .86rem; }
#ai-code { width: 100%; margin: 6px 0 16px; min-height: 44px; padding: 8px; border: 1px solid #c9bee7; border-radius: 8px; }
.dialog-actions { display: flex; justify-content: end; gap: 8px; }
@media (max-width: 680px) {
  .action-buttons:has(#ai-erase:not([hidden])) { grid-template-columns: 1fr 1fr 1.3fr; }
  .action-buttons:has(#ai-erase:not([hidden])) .button { font-size: .8rem; gap: 4px; }
  .action-buttons:has(#ai-erase:not([hidden])) .icon { width: .9rem; height: .9rem; }
}

.header-actions { display: flex; align-items: center; gap: 8px; }
#ai-sign-in { padding: 8px; font-size: .82rem; color: var(--accent); font-weight: 650; }