@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;600&display=swap');

:root {
  --bg: #f6f7fb;
  --panel: #ffffff;
  --border: #e8e8ef;
  --text: #1f2330;
  --muted: #6b7280;
  --primary: #4f46e5;
  --primary-600: #4338ca;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: 'Noto Sans SC', system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
}

.container {
  max-width: 960px;
  margin: 32px auto;
  padding: 24px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: 0 6px 18px rgba(0,0,0,.06);
}

h1 {
  margin: 0 0 16px;
  font-size: 22px;
}

.controls .row { margin-bottom: 14px; }
.controls .grid {
  display: grid;
  gap: 12px;
}
.controls .grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.controls .grid.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }

label { font-size: 13px; color: var(--muted); display: flex; flex-direction: column; gap: 6px; }
input[type="number"], input[type="color"], select, textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 14px;
  color: var(--text);
  background: #fff;
  outline: none;
}
input[type="number"]:focus, select:focus, textarea:focus, .wm-input:focus, .wm-input:focus-visible {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79,70,229,.12);
}
textarea { resize: vertical; min-height: 120px; }

.file { display: inline-flex; align-items: center; gap: 10px; }
.file input[type="file"] { display: none; }
.file .file-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 10px;
  background: var(--primary);
  color: #fff;
  cursor: pointer;
}
.file .file-btn:hover { background: var(--primary-600); }
.file .file-name { color: var(--muted); font-size: 14px; }

.actions { display: flex; gap: 12px; justify-content: center; align-items: center; }
button {
  padding: 10px 16px;
  border-radius: 10px;
  border: 1px solid transparent;
  cursor: pointer;
  font-size: 14px;
}
button.primary { background: var(--primary); color: #fff; }
button.primary:hover { background: var(--primary-600); }
button.outline { background: #fff; color: #111827; border-color: var(--border); }
button.outline:hover { border-color: var(--primary); color: var(--primary); }

.watermark-row { display: flex; align-items: center; gap: 12px; }
.switch { display: inline-flex; flex-direction: row; align-items: center; gap: 10px; cursor: pointer; user-select: none; }
.switch input { position: absolute; opacity: 0; width: 0; height: 0; }
.switch .slider {
  order: 1;
  position: relative;
  width: 44px;
  height: 24px;
  border-radius: 999px;
  background: #e5e7eb; /* 关闭态：浅灰色 */
  box-shadow: inset 0 0 0 2px rgba(0,0,0,0.08);
  transition: background .2s ease;
}
.switch .slider::before {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #ffffff;
  box-shadow: 0 1px 2px rgba(0,0,0,0.25), inset 0 0 0 1px rgba(0,0,0,0.06);
  transition: left .2s ease;
}
.switch input:checked + .slider {
  background: var(--primary); /* 开启态：与“选择文件”一致 */
}
.switch input:checked + .slider::before {
  left: 23px;
}
.switch .switch-text { order: 2; color: var(--text); font-size: 14px; }
.wm-input { 
  flex: 1; 
  border: 1px solid var(--border); 
  border-radius: 10px; 
  padding: 10px 12px; 
  font-size: 14px; 
  outline: none; 
  transition: border-color .2s ease, box-shadow .2s ease;
}
.wm-input.hidden { display: none; }

.preview {
  margin-top: 18px;
  width: 100%;
  overflow: auto;
  border: 1px dashed var(--border);
  border-radius: 12px;
  padding: 12px;
  background: #fafbff;
}
canvas {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 0 auto;
  background: #f1f3f8;
  border-radius: 8px;
}