:root {
  color-scheme: dark;
  --page-background: linear-gradient(to bottom left, rgb(44, 44, 44) 0%, rgb(1, 1, 1) 100%);
  --panel: #15171a;
  --panel-soft: #1b1e22;
  --line: rgba(255, 255, 255, 0.1);
  --line-strong: rgba(255, 255, 255, 0.18);
  --text: #f3f1ed;
  --muted: #969a9f;
  --subtle: #70757a;
  --accent: #c7edda;
  --accent-deep: #83b8a0;
  --button-hover: rgba(255,255,255,.07);
  --canvas-shadow: 0 24px 80px rgba(0,0,0,.32);
  --toast-bg: #24282b;
  font-family: Inter, "Segoe UI", "Microsoft YaHei", sans-serif;
}

:root[data-theme="light"] {
  color-scheme: light;
  --page-background: linear-gradient(to bottom left, rgb(220, 220, 220) 0%, rgb(255, 255, 255) 100%);
  --panel: #ffffff;
  --panel-soft: #f0f2ef;
  --line: rgba(24, 30, 27, 0.1);
  --line-strong: rgba(24, 30, 27, 0.2);
  --text: #1c211e;
  --muted: #747b76;
  --subtle: #959b97;
  --accent: #467c65;
  --accent-deep: #5d947b;
  --button-hover: rgba(28,33,30,.06);
  --canvas-shadow: 0 24px 70px rgba(53,62,57,.16);
  --toast-bg: #ffffff;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  color: var(--text);
  background: var(--page-background);
  background-attachment: fixed;
  transition: color .35s ease, background-color .35s ease;
}
button { font: inherit; }
.app-shell { min-height: 100vh; }
.preview-panel { position: relative; min-width: 0; height: 100vh; height: 100svh; overflow: hidden; background: var(--page-background); }
.preview-header { position: absolute; top: 0; left: 0; right: 0; z-index: 3; display: flex; align-items: center; justify-content: space-between; padding: 28px 34px; pointer-events: none; }
.preview-header > * { pointer-events: auto; }
.eyebrow { margin: 0 0 8px; color: var(--muted); font-size: 10px; font-weight: 700; letter-spacing: .19em; }
h1, h2, h3, p { margin: 0; }
h1 { font-size: clamp(26px, 3vw, 42px); font-weight: 560; letter-spacing: .02em; }
h2 { font-size: 24px; font-weight: 600; }
h3 { font-size: 16px; font-weight: 600; }
.preview-actions { position: absolute; left: 50%; bottom: 162px; z-index: 4; display: flex; gap: 6px; padding: 6px; border: 1px solid var(--line-strong); border-radius: 8px; background: color-mix(in srgb, var(--panel) 88%, transparent); box-shadow: 0 12px 35px rgba(0, 0, 0, .16); backdrop-filter: blur(16px); transform: translateX(-50%); }
.icon-button { display: flex; width: 38px; height: 38px; min-width: 38px; min-height: 38px; padding: 0; flex: 0 0 38px; align-items: center; justify-content: center; appearance: none; border: 1px solid var(--line); border-radius: 8px; color: var(--text); background: transparent; cursor: pointer; line-height: 1; transition: .2s ease; }
.icon-button svg { display: block; width: 18px; height: 18px; flex: 0 0 18px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.theme-icon { display: grid; width: 18px; height: 18px; place-items: center; }
.theme-icon svg { grid-area: 1 / 1; }
.theme-icon-sun { display: none !important; }
:root[data-theme="light"] .theme-icon-moon { display: none; }
:root[data-theme="light"] .theme-icon-sun { display: block !important; }
.icon-button:hover { border-color: var(--line-strong); background: var(--button-hover); transform: translateY(-1px); }
.icon-button:disabled { cursor: progress; opacity: .48; transform: none; }
.canvas-wrap { position: absolute; inset: 0; }
.canvas-stage { position: absolute; inset: 0; width: 100%; height: 100%; overflow: hidden; background: transparent; }
.canvas-layer { position: absolute; inset: 0; width: 100%; height: 100%; display: block; object-fit: contain; pointer-events: none; user-select: none; }
.canvas-layer:not(.brand-layer) { transform: scale(.86); transform-origin: center center; transition: opacity .18s ease; }
.canvas-layer#baseLayer { opacity: .5; }
.canvas-stage.is-view-switching .canvas-layer:not(.brand-layer) { opacity: 0; }
.canvas-layer.brand-layer { z-index: 2; }
.canvas-layer[hidden] { display: none; }
.view-arrow { display: grid; width: 38px; height: 38px; min-width: 38px; min-height: 38px; padding: 0; flex: 0 0 38px; place-items: center; appearance: none; border: 1px solid var(--line); border-radius: 8px; color: var(--text); background: transparent; cursor: pointer; opacity: .8; transition: opacity .2s ease, border-color .2s ease, background-color .2s ease, transform .2s ease; }
.view-arrow-left { margin-right: 4px; }
.view-arrow-right { margin-left: 4px; }
.view-arrow svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.view-arrow:hover { opacity: 1; border-color: var(--line-strong); background: var(--button-hover); transform: translateY(-1px); }
.view-arrow:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; opacity: 1; }
.canvas-disclaimer { position: absolute; left: 50%; bottom: 24px; z-index: 2; width: min(calc(100% - 48px), 720px); color: var(--muted); font-size: 12px; line-height: 1.7; text-align: center; letter-spacing: .02em; transform: translateX(-50%); pointer-events: none; }
.config-dock { position: absolute; left: 50%; bottom: 76px; z-index: 4; display: flex; align-items: center; gap: 18px; width: min(calc(100% - 48px), 620px); padding: 10px; border: 1px solid var(--line-strong); border-radius: 8px; background: color-mix(in srgb, var(--panel) 88%, transparent); box-shadow: 0 18px 55px rgba(0, 0, 0, .18); backdrop-filter: blur(18px); transform: translateX(-50%); }
.dock-title { display: flex; min-width: 105px; padding: 0 8px; flex-direction: column; gap: 3px; }
.dock-title span { color: var(--subtle); font-size: 9px; font-weight: 700; letter-spacing: .16em; }
.dock-title strong { font-size: 14px; font-weight: 600; }
.dock-controls { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; flex: 1; min-width: 0; }
.dock-control { display: flex; width: 100%; min-width: 0; height: 52px; padding: 8px 11px; align-items: center; gap: 10px; border: 1px solid var(--line); border-radius: 7px; color: var(--text); background: var(--button-hover); text-align: left; cursor: pointer; transition: border-color .2s ease, background-color .2s ease, transform .2s ease; }
.dock-control:hover, .dock-control[aria-expanded="true"] { border-color: var(--line-strong); background: var(--panel-soft); }
.dock-control:hover { transform: translateY(-1px); }
.selected-swatch { display: grid; width: 28px; height: 28px; flex: 0 0 28px; place-items: center; border-radius: 50%; }
.selected-swatch { background: var(--swatch); box-shadow: inset 0 0 0 1px rgba(0, 0, 0, .14), 0 4px 12px rgba(0, 0, 0, .15); }
.control-copy { display: flex; min-width: 0; flex: 1; flex-direction: column; gap: 2px; }
.control-copy small { color: var(--muted); font-size: 9px; letter-spacing: .08em; }
.control-copy strong { overflow: hidden; font-size: 12px; font-weight: 600; text-overflow: ellipsis; white-space: nowrap; }
.chevron { color: var(--muted); font-size: 15px; transition: transform .2s ease; }
.dropdown-trigger[aria-expanded="true"] .chevron { transform: rotate(180deg); }
.dropdown-control { position: relative; min-width: 0; }
.dropdown-menu { position: absolute; left: 50%; bottom: calc(100% + 10px); z-index: 6; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 5px; width: 264px; max-height: min(390px, calc(100vh - 190px)); padding: 8px; overflow-y: auto; border: 1px solid var(--line-strong); border-radius: 8px; background: var(--panel); box-shadow: 0 20px 60px rgba(0, 0, 0, .28); opacity: 0; visibility: hidden; transform: translate(-50%, 8px); transition: opacity .16s ease, transform .16s ease, visibility .16s; }
.dropdown-control:last-child .dropdown-menu { right: 0; left: auto; transform: translate(0, 8px); }
.dropdown-control.is-open .dropdown-menu { opacity: 1; visibility: visible; transform: translate(-50%, 0); }
.dropdown-control:last-child.is-open .dropdown-menu { transform: translate(0, 0); }
.dropdown-option { display: flex; min-width: 0; height: 40px; padding: 6px 8px; align-items: center; gap: 9px; border: 1px solid transparent; border-radius: 6px; color: var(--muted); background: transparent; cursor: pointer; text-align: left; }
.dropdown-option:hover { color: var(--text); background: var(--button-hover); }
.dropdown-option.is-selected { border-color: var(--line-strong); color: var(--text); background: var(--panel-soft); }
.dropdown-option .swatch { width: 20px; height: 20px; flex: 0 0 20px; border-radius: 50%; background: var(--swatch); box-shadow: inset 0 0 0 1px rgba(0, 0, 0, .14); }
.dropdown-option span:last-child { overflow: hidden; font-size: 11px; text-overflow: ellipsis; white-space: nowrap; }
.save-preview[hidden] { display: none; }
.save-preview { position: fixed; inset: 0; z-index: 20; display: grid; padding: max(16px, env(safe-area-inset-top)) 14px max(16px, env(safe-area-inset-bottom)); place-items: center; background: rgba(0, 0, 0, .72); opacity: 0; backdrop-filter: blur(12px); transition: opacity .2s ease; }
.save-preview.is-open { opacity: 1; }
.save-preview-card { width: min(100%, 760px); max-height: 100%; overflow: hidden; border: 1px solid var(--line-strong); border-radius: 8px; background: var(--panel); box-shadow: 0 24px 80px rgba(0, 0, 0, .38); transform: translateY(10px) scale(.985); transition: transform .2s ease; }
.save-preview.is-open .save-preview-card { transform: translateY(0) scale(1); }
.save-preview-header { display: flex; height: 48px; padding: 0 10px 0 16px; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); }
.save-preview-header h2 { font-size: 15px; font-weight: 600; }
.save-preview-close { display: grid; width: 32px; height: 32px; padding: 0; place-items: center; appearance: none; border: 0; border-radius: 6px; color: var(--text); background: transparent; cursor: pointer; }
.save-preview-close:hover { background: var(--button-hover); }
.save-preview-close svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; }
.save-preview-image-wrap { display: grid; max-height: calc(100svh - 96px); padding: 10px; place-items: center; overflow: auto; background: #080909; }
.save-preview-image { display: block; width: 100%; max-height: calc(100svh - 116px); object-fit: contain; -webkit-touch-callout: default; user-select: auto; touch-action: pinch-zoom; }
.save-preview-footer { display: flex; min-height: 68px; padding: 10px 12px; align-items: center; justify-content: space-between; gap: 14px; border-top: 1px solid var(--line); }
.save-preview-footer p { color: var(--muted); font-size: 13px; }
.save-preview-download { display: flex; min-width: 112px; height: 38px; padding: 0 14px; align-items: center; justify-content: center; gap: 7px; appearance: none; border: 1px solid var(--line-strong); border-radius: 7px; color: var(--text); background: var(--button-hover); cursor: pointer; font-size: 13px; font-weight: 600; }
.save-preview-download:hover { background: var(--panel-soft); }
.save-preview-download svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
body.is-preview-open { overflow: hidden; }
.toast { position: fixed; left: 50%; bottom: 26px; z-index: 5; padding: 10px 14px; border: 1px solid var(--line-strong); border-radius: 8px; color: var(--text); background: var(--toast-bg); box-shadow: 0 12px 30px rgba(0,0,0,.18); font-size: 13px; opacity: 0; pointer-events: none; transform: translate(-50%, 12px); transition: .25s ease; }
.toast.is-visible { opacity: 1; transform: translate(-50%, 0); }
@media (max-width: 900px) {
  .canvas-layer { object-fit: contain; }
  .config-dock { width: min(calc(100% - 32px), 560px); gap: 0; }
  .dock-title { display: none; }
}
@media (max-width: 520px) {
  .preview-header { padding: 20px 18px; }
  .canvas-stage { transform: translateY(-18svh); transform-origin: center center; }
  .canvas-layer:not(.brand-layer) { transform: scale(.92); }
  .canvas-layer.brand-layer { transform: scale(1.12); transform-origin: center center; }
  .preview-actions { top: 60svh; bottom: auto; gap: 4px; padding: 4px; transform: translateX(-50%) scale(.9); transform-origin: top center; }
  .icon-button { width: 32px; height: 32px; min-width: 32px; min-height: 32px; flex-basis: 32px; border-radius: 6px; }
  .icon-button svg, .theme-icon { width: 17px; height: 17px; flex-basis: 17px; }
  .view-arrow { width: 32px; height: 32px; min-width: 32px; min-height: 32px; flex-basis: 32px; border-radius: 6px; opacity: .82; }
  .view-arrow-left { margin-right: 2px; }
  .view-arrow-right { margin-left: 2px; }
  .view-arrow svg { width: 17px; height: 17px; }
  .canvas-disclaimer { bottom: 24px; font-size: 10px; }
  .config-dock { top: 66svh; bottom: auto; gap: 6px; width: min(calc(100% - 20px), 410px); padding: 7px; flex-direction: column; align-items: stretch; transform: translateX(-50%) scale(.9); transform-origin: top center; }
  .dock-title { display: flex; min-width: 0; padding: 0 4px; flex-direction: row; align-items: center; }
  .dock-title span { display: none; }
  .dock-title strong { font-size: 15px; }
  .dock-controls { grid-template-columns: 1fr; gap: 5px; }
  .dock-control { height: 42px; padding: 6px 10px; gap: 9px; }
  .selected-swatch { width: 24px; height: 24px; flex-basis: 24px; }
  .control-copy { flex-direction: row; align-items: center; gap: 2px; }
  .control-copy small { display: inline; color: var(--text); font-size: 13px; letter-spacing: 0; }
  .control-copy small::after { content: "："; }
  .control-copy strong { font-size: 13px; }
  .chevron { font-size: 17px; }
  .dropdown-control .dropdown-menu,
  .dropdown-control:last-child .dropdown-menu { top: calc(100% + 5px); right: 0; bottom: auto; left: 0; width: 100%; max-height: min(140px, calc(36svh - 112px)); transform: translateY(-5px); }
  .dropdown-control.is-open .dropdown-menu,
  .dropdown-control:last-child.is-open .dropdown-menu { transform: translateY(0); }
  .save-preview { padding-right: 10px; padding-left: 10px; }
  .save-preview-card { width: 100%; }
  .save-preview-header { height: 44px; padding-left: 13px; }
  .save-preview-image-wrap { max-height: calc(100svh - 144px); padding: 6px; }
  .save-preview-image { max-height: calc(100svh - 156px); }
  .save-preview-footer { min-height: 64px; padding: 9px 10px; }
  .save-preview-footer p { font-size: 13px; }
  .save-preview-download { min-width: 108px; height: 38px; padding: 0 12px; }
}