:root {
  --bg: #f5f7fb;
  --card: #ffffff;
  --primary: #3b6cff;
  --primary-dark: #2f56cc;
  --text: #1d2433;
  --muted: #8a93a6;
  --border: #e4e8f0;
  --brush: rgba(255, 60, 60, 0.55);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", Segoe UI, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 28px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
}
.brand { font-weight: 700; font-size: 18px; color: var(--text); text-decoration: none; }
.topnav { display: flex; gap: 10px; align-items: center; }

/* 免费/第三方 开关 */
.mode-toggle { display: inline-flex; border: 1px solid var(--border); border-radius: 12px; overflow: hidden; margin-bottom: 14px; }
.mode-toggle button { border: none; background: #fff; padding: 10px 18px; font-size: 14px; cursor: pointer; color: var(--muted); }
.mode-toggle button.active { background: var(--primary); color: #fff; font-weight: 600; }
.mode-toggle button:not(.active):hover { background: #f0f4ff; color: var(--primary); }

.container { max-width: 980px; margin: 0 auto; padding: 40px 20px 60px; }
h1 { text-align: center; font-size: 30px; margin: 0 0 8px; }
.subtitle { text-align: center; color: var(--muted); margin: 0 0 32px; }

.dropzone {
  border: 2px dashed var(--border);
  border-radius: 16px;
  background: var(--card);
  padding: 64px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color .2s, background .2s;
}
.dropzone:hover, .dropzone.dragover { border-color: var(--primary); background: #f0f4ff; }
.dz-icon { font-size: 44px; margin-bottom: 10px; }
.muted { color: var(--muted); font-size: 13px; }

.editor { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 20px; }
.toolbar { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; margin-bottom: 16px; }
.toolbar label { font-size: 13px; color: var(--muted); display: flex; align-items: center; gap: 8px; }
.toolbar select, .toolbar input[type=range] { accent-color: var(--primary); }

.primary-btn {
  background: var(--primary); color: #fff; border: none; padding: 10px 18px;
  border-radius: 10px; font-weight: 600; cursor: pointer; text-decoration: none;
  display: inline-block; transition: background .15s;
}
.primary-btn:hover { background: var(--primary-dark); }
.ghost-btn {
  background: transparent; color: var(--text); border: 1px solid var(--border);
  padding: 8px 14px; border-radius: 10px; cursor: pointer; text-decoration: none; font-size: 14px;
}
.ghost-btn:hover { border-color: var(--primary); color: var(--primary); }
.runBtn { margin-left: auto; }
#runBtn { margin-left: auto; }

.canvas-area { display: flex; gap: 24px; flex-wrap: wrap; align-items: flex-start; }
.canvas-wrap { position: relative; flex: 1; min-width: 280px; line-height: 0; }
.canvas-wrap canvas { position: absolute; top: 0; left: 0; max-width: 100%; border-radius: 10px; }
.canvas-wrap #imageCanvas { position: relative; border: 1px solid var(--border); }
.canvas-wrap #maskCanvas { cursor: crosshair; }

.result-wrap { flex: 1; min-width: 280px; text-align: center; }
.panel-title { font-weight: 600; margin: 0 0 10px; }
.result-wrap img { max-width: 100%; border-radius: 10px; border: 1px solid var(--border); margin-bottom: 14px; }

.hint { color: var(--muted); font-size: 13px; margin-top: 16px; }
.footer { text-align: center; color: var(--muted); font-size: 13px; padding: 24px; }

.loading { display: flex; align-items: center; gap: 12px; justify-content: center; margin-top: 20px; color: var(--muted); }
.spinner { width: 22px; height: 22px; border: 3px solid var(--border); border-top-color: var(--primary); border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.toast {
  position: fixed; bottom: 28px; left: 50%; transform: translateX(-50%);
  background: #1d2433; color: #fff; padding: 12px 20px; border-radius: 10px; font-size: 14px; z-index: 50;
}
.hidden { display: none !important; }

/* ---- SEO 正文 / FAQ ---- */
.seo-content { max-width: 760px; margin: 48px auto 0; padding-top: 28px; border-top: 1px solid var(--border); color: var(--text); line-height: 1.85; }
.seo-content h2 { font-size: 20px; margin: 28px 0 12px; }
.seo-content p { color: #4a5568; margin: 0 0 14px; }
.seo-content ol { color: #4a5568; padding-left: 20px; }
.seo-content ol li { margin-bottom: 8px; }
.seo-content details { border: 1px solid var(--border); border-radius: 10px; padding: 12px 16px; margin-bottom: 10px; }
.seo-content summary { cursor: pointer; font-weight: 600; }
.seo-content details p { margin: 10px 0 0; }

/* ---- 状态条 ---- */
.status-bar { border-radius: 10px; padding: 12px 16px; font-size: 14px; margin-bottom: 20px; }
.status-bar.ok { background: #e6f7ee; color: #1a7d48; }
.status-bar.warn { background: #fff4e5; color: #a15c00; }
.status-bar a { color: inherit; font-weight: 600; }

/* ---- 原图/结果对比 ---- */
.compare { display: flex; gap: 20px; flex-wrap: wrap; }
.panel { flex: 1; min-width: 260px; text-align: center; }
.panel img { max-width: 100%; border-radius: 10px; border: 1px solid var(--border); }

/* 框选叠加层 */
.select-wrap { position: relative; display: inline-block; line-height: 0; max-width: 100%; }
.select-wrap #originalImg { display: block; }
.select-wrap #boxCanvas { position: absolute; top: 0; left: 0; cursor: crosshair; touch-action: none; }
.select-hint { color: var(--muted); font-size: 13px; margin: 0 0 14px; }
.placeholder {
  min-height: 180px; display: flex; align-items: center; justify-content: center;
  color: var(--muted); background: #fafbfe; border: 1px dashed var(--border); border-radius: 10px; padding: 20px;
}
#downloadBtn { margin-top: 14px; }

.switch { display: inline-flex; align-items: center; gap: 6px; cursor: pointer; }

/* ---- 证件照 ---- */
.idp-layout { display: flex; gap: 28px; flex-wrap: wrap; align-items: flex-start; }
.idp-canvas-col { flex: 0 0 auto; text-align: center; }
#photoCanvas { border: 1px solid var(--border); border-radius: 10px; cursor: grab; touch-action: none; max-width: 100%; }
#photoCanvas:active { cursor: grabbing; }
.idp-controls { flex: 1; min-width: 260px; }
.color-row { display: flex; gap: 8px; align-items: center; margin-top: 6px; flex-wrap: wrap; }
.color-chip {
  -webkit-appearance: none; appearance: none;
  display: inline-flex; align-items: center; gap: 7px;
  background: #fff; border: 1.5px solid var(--border); border-radius: 999px;
  padding: 7px 14px; font-size: 13px; color: var(--text); cursor: pointer;
}
.color-chip:hover { border-color: var(--primary); }
.color-chip.active { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(59,108,255,.18); font-weight: 600; }
.chip-dot { width: 16px; height: 16px; border-radius: 50%; border: 1px solid rgba(0,0,0,.15); flex: 0 0 auto; }
.custom-chip input[type=color] {
  -webkit-appearance: none; appearance: none;
  width: 18px; height: 18px; border: 1px solid rgba(0,0,0,.15); border-radius: 50%;
  background: none; cursor: pointer; padding: 0;
}
.custom-chip input[type=color]::-webkit-color-swatch-wrapper { padding: 0; }
.custom-chip input[type=color]::-webkit-color-swatch { border: none; border-radius: 50%; }
.idp-actions { display: flex; flex-direction: column; gap: 10px; margin-top: 18px; }
.idp-actions .primary-btn, .idp-actions .ghost-btn { text-align: center; }

/* ---- PDF 工具 ---- */
.pdf-nav { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
.pdf-nav a {
  padding: 7px 14px; border: 1.5px solid var(--border); border-radius: 999px;
  font-size: 13px; color: var(--text); text-decoration: none; cursor: pointer; background: #fff;
}
.pdf-nav a:hover { border-color: var(--primary); color: var(--primary); }
.pdf-nav a.active { background: var(--primary); border-color: var(--primary); color: #fff; font-weight: 600; }
.pdf-files { list-style: none; margin: 0; padding: 0; }
.pdf-files li {
  display: flex; justify-content: space-between; align-items: center;
  padding: 10px 12px; border: 1px solid var(--border); border-radius: 10px; margin-bottom: 8px; font-size: 14px;
}
.pdf-file-ops button {
  -webkit-appearance: none; appearance: none;
  border: 1px solid var(--border); background: #fff; border-radius: 8px;
  padding: 4px 9px; margin-left: 6px; cursor: pointer; font-size: 13px;
}
.pdf-file-ops button:hover { border-color: var(--primary); color: var(--primary); }
#signPad { border: 1px dashed var(--border); border-radius: 10px; cursor: crosshair; touch-action: none; background: #fff; max-width: 100%; }

/* ---- 设置页 ---- */
.container.narrow { max-width: 640px; }
.settings-card { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 24px; }
.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px; font-size: 14px; }
.field > span { color: var(--muted); }
.field input[type=text], .field input[type=password], .field select {
  padding: 10px 12px; border: 1px solid var(--border); border-radius: 10px; font-size: 14px; width: 100%;
}
.field.switch { flex-direction: row; align-items: center; }
.provider-note { color: var(--muted); font-size: 13px; margin: 4px 0 12px; }
.settings-actions { display: flex; align-items: center; gap: 12px; margin-top: 8px; }
.saved-hint { color: #1a9d5a; font-size: 14px; }