/* 颜色与尺寸变量；深色模式在下方覆盖 */
:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --text: #1c2128;
  --muted: #667085;
  --line: #e3e6eb;
  --accent: #2557d6;
  --accent-text: #ffffff;
  --accent-soft: #e8eefc;
  --warn-bg: #fff6e0;
  --warn-text: #7a5300;
  --danger: #b42318;
  --radius: 10px;
  --gutter: 16px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14171c;
    --surface: #1d2127;
    --text: #e8eaed;
    --muted: #98a2b3;
    --line: #2e343c;
    --accent: #7ba2ff;
    --accent-text: #0e1726;
    --accent-soft: #232c40;
    --warn-bg: #3a2f14;
    --warn-text: #f3d28a;
    --danger: #ff8a80;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.6 -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
}
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 var(--gutter); }

.top { padding: 28px 0 8px; }
.top h1 { margin: 0 0 6px; font-size: 24px; letter-spacing: .2px; }
.lead { margin: 0; color: var(--muted); max-width: 46em; }

h2 { margin: 0; font-size: 16px; }
.muted { color: var(--muted); font-size: 13px; }

/* 上传区 */
.drop {
  margin: 20px 0 12px;
  padding: 34px 20px;
  border: 2px dashed var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  text-align: center;
  cursor: pointer;
  transition: border-color .15s, background .15s;
}
.drop:hover, .drop:focus-visible, .drop.over { border-color: var(--accent); background: var(--accent-soft); outline: none; }
.drop-title { margin: 0 0 4px; font-size: 17px; font-weight: 600; }
.drop-sub { margin: 0; color: var(--muted); font-size: 13px; }

.status { margin: 8px 0 12px; padding: 10px 14px; border-radius: 8px; background: var(--accent-soft); }
.status.error { background: var(--warn-bg); color: var(--danger); }

/* 工具栏 */
.toolbar {
  display: flex; flex-wrap: wrap; gap: 12px;
  align-items: center; justify-content: space-between;
  margin: 16px 0;
}
.file-info { display: flex; flex-direction: column; min-width: 0; }
.file-info strong { overflow-wrap: anywhere; }
.actions { display: flex; flex-wrap: wrap; gap: 8px; }

.btn {
  font: inherit; cursor: pointer;
  padding: 8px 14px; border-radius: 8px;
  border: 1px solid var(--line); background: var(--surface); color: var(--text);
}
.btn:hover:not(:disabled) { border-color: var(--accent); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); font-weight: 600; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn:focus-visible, .chip:focus-visible, select:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* 卡片 */
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  margin: 0 0 16px;
}
.card-head { display: flex; flex-wrap: wrap; gap: 8px 16px; align-items: center; justify-content: space-between; margin-bottom: 12px; }
.card-head .muted { margin: 0; flex-basis: 100%; }

.presets { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  font: inherit; font-size: 13px; cursor: pointer;
  padding: 5px 12px; border-radius: 999px;
  border: 1px solid var(--line); background: var(--bg); color: var(--text);
}
.chip:hover { border-color: var(--accent); background: var(--accent-soft); }

/* 颜色行 */
.color-list { display: grid; gap: 8px; }
.color-row {
  display: grid; grid-template-columns: 28px 1fr auto; gap: 12px; align-items: center;
  padding: 8px 10px; border: 1px solid var(--line); border-radius: 8px;
}
.swatch { width: 28px; height: 28px; border-radius: 6px; border: 1px solid var(--line); }
.color-name { font-weight: 600; }
.color-use { color: var(--muted); font-size: 13px; }
select {
  font: inherit; padding: 6px 8px; border-radius: 6px;
  border: 1px solid var(--line); background: var(--surface); color: var(--text);
  max-width: 100%;
}
.check { display: flex; gap: 8px; align-items: flex-start; margin-top: 12px; }
.check input { margin-top: 5px; }
.notice { margin: 0 0 12px; padding: 10px 14px; border-radius: 8px; background: var(--warn-bg); color: var(--warn-text); }

/* 逐页预览 */
.pages { display: grid; gap: 20px; }
.page-card { border: 1px solid var(--line); border-radius: 8px; padding: 12px; }
.page-head { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; justify-content: space-between; margin-bottom: 10px; }
.page-head strong { font-size: 14px; }
.pair { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.pane { min-width: 0; }
.pane-label { font-size: 12px; color: var(--muted); margin-bottom: 4px; }
.pane canvas { display: block; width: 100%; height: auto; background: #fff; border: 1px solid var(--line); border-radius: 4px; }

.notes ul { margin: 10px 0 0; padding-left: 1.2em; }
.notes li { margin: 4px 0; }
.foot { padding: 8px var(--gutter) 28px; }

@media (max-width: 640px) {
  .pair { grid-template-columns: 1fr; }
  .color-row { grid-template-columns: 28px 1fr; }
  .color-row select { grid-column: 1 / -1; }
  .actions { width: 100%; }
  .actions .btn { flex: 1; }
}

/* 让 hidden 属性在任何 display 设置下都生效 */
[hidden] { display: none !important; }