:root {
  color-scheme: light dark;
  --bg: #f8fafc;
  --fg: #0f172a;
  --muted: #64748b;
  --line: #e2e8f0;
  --card: #ffffff;
  --brand: #2563eb;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1120;
    --fg: #e2e8f0;
    --muted: #94a3b8;
    --line: #1e293b;
    --card: #111c33;
    --brand: #3b82f6;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.7 -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

.top {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--line);
}
.brand { font-weight: 650; color: inherit; text-decoration: none; letter-spacing: .2px; }
.tag { font-size: 12px; color: var(--muted); border: 1px solid var(--line); border-radius: 999px; padding: 1px 8px; }

.wrap { max-width: 760px; margin: 0 auto; padding: 32px 20px 56px; }

/* 桌面宽屏：让预览台更宽（CAD / 思维导图这类需要横向空间），正文段落仍限宽保证可读性 */
@media (min-width: 1024px) {
  .wrap { max-width: 1120px; }
  /* 只限正文类元素；进度条 / 状态行 / 卡片必须与容器同宽，否则看起来「线断了一截」 */
  .wrap > h1, .wrap > .lead, .wrap > .notes { max-width: 760px; }
}
h1 { font-size: 24px; line-height: 1.35; margin: 0 0 8px; }
h2 { font-size: 15px; margin: 22px 0 8px; }
.lead { margin: 0 0 22px; color: var(--muted); }

.dropzone {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 34px 20px;
  border: 1.5px dashed var(--line);
  border-radius: 14px;
  background: var(--card);
  transition: border-color .15s, background .15s;
}
.dropzone.dragging { border-color: var(--brand); background: color-mix(in srgb, var(--brand) 8%, var(--card)); }
.pick {
  display: inline-block;
  padding: 10px 18px;
  border-radius: 10px;
  background: var(--brand);
  color: #fff;
  cursor: pointer;
  font-weight: 550;
}
.drop-hint { font-size: 13px; color: var(--muted); }

progress { width: 100%; height: 8px; margin-top: 16px; }
.status { font-size: 13.5px; color: var(--muted); min-height: 22px; }
.status[data-tone="error"] { color: #dc2626; }

.card {
  margin-top: 18px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--card);
}
.card h2 { font-size: 16px; margin: 0 0 6px; word-break: break-all; }
.meta, .plugin, .caps { margin: 0 0 6px; font-size: 13px; color: var(--muted); }
.preview { margin: 10px 0 0;
  padding: 12px;
  max-height: 340px;
  overflow: auto;
  border-radius: 10px;
  background: color-mix(in srgb, var(--fg) 5%, transparent);
  font: 12.5px/1.6 ui-monospace, SFMono-Regular, Menlo, monospace;
  white-space: pre-wrap;
  word-break: break-word;
}

.notes ul { margin: 0 0 6px; padding-left: 20px; font-size: 13.5px; color: var(--muted); }
.hint { margin-top: 18px; font-size: 13px; color: var(--muted); }

.foot {
  display: flex;
  gap: 14px;
  justify-content: center;
  padding: 18px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  color: var(--muted);
}
.foot a { color: inherit; }

/* 前端化插件以 iframe 内嵌：宿主只给舞台尺寸，插件自己管滚动与样式 */
.plugin-frame {
  display: block;
  width: 100%;
  height: min(72vh, 720px);
  border: 0;
  border-radius: 10px;
  background: transparent;
}