:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --border: #e7e9ee;
  --text: #181c24;
  --text-2: #6b7280;
  --text-3: #9aa1ac;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --accent-soft: #eff6ff;
  --danger: #ef4444;
  --ok: #16a34a;
  --radius: 14px;
  --shadow: 0 1px 3px rgba(16, 24, 40, .06), 0 1px 2px rgba(16, 24, 40, .04);
  --shadow-lg: 0 12px 32px rgba(16, 24, 40, .10);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  line-height: 1.5;
}

/* 头部 */
.app-header {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 32px 24px 8px;
  justify-content: center;
}
.logo {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 13px;
  color: #fff;
  background: linear-gradient(135deg, #60a5fa, #3b82f6);
  box-shadow: var(--shadow-lg);
}
.app-header h1 { font-size: 22px; font-weight: 700; letter-spacing: .2px; }
.subtitle { color: var(--text-2); font-size: 13px; margin-top: 2px; }

.container {
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  padding: 20px 20px 40px;
  flex: 1;
}

/* 上传区 */
.dropzone {
  background: var(--card);
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  transition: border-color .18s, background .18s, transform .18s;
  outline: none;
}
.dropzone:hover, .dropzone:focus-visible { border-color: var(--accent); }
.dropzone.dragover {
  border-color: var(--accent);
  background: var(--accent-soft);
  transform: scale(1.005);
}
.dz-icon { color: var(--accent); margin-bottom: 12px; }
.dz-title { font-size: 17px; font-weight: 600; }
.dz-sub { color: var(--text-2); font-size: 14px; margin-top: 6px; }
.dz-sub .link { color: var(--accent); font-weight: 500; }
.dz-hint { color: var(--text-3); font-size: 12px; margin-top: 14px; }

/* 面板 */
.panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px 20px;
  margin-top: 16px;
}

/* 设置区 */
.settings-row {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  align-items: flex-end;
}
.field { display: flex; flex-direction: column; gap: 8px; min-width: 140px; }
.field.grow { flex: 1; min-width: 200px; }
.field-label { font-size: 13px; color: var(--text-2); font-weight: 500; }
.q-val { color: var(--accent); font-weight: 600; }

.segmented {
  display: inline-flex;
  background: #f1f2f5;
  border-radius: 10px;
  padding: 3px;
  gap: 2px;
}
.segmented button {
  border: none;
  background: transparent;
  padding: 7px 15px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-2);
  cursor: pointer;
  transition: background .15s, color .15s;
}
.segmented button.active {
  background: #fff;
  color: var(--text);
  box-shadow: var(--shadow);
}

input[type="range"] { accent-color: var(--accent); width: 100%; }
.color-input {
  width: 44px;
  height: 34px;
  padding: 2px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  cursor: pointer;
}
.field-note { color: var(--text-3); font-size: 12px; margin-top: 12px; }

/* 文件列表 */
.file-list { padding: 8px 12px; }
.file-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 8px;
  border-bottom: 1px solid var(--border);
}
.file-item:last-child { border-bottom: none; }
.thumb {
  width: 52px;
  height: 52px;
  object-fit: cover;
  border-radius: 10px;
  background: #f1f2f5;
  flex-shrink: 0;
}
.file-info { flex: 1; min-width: 0; }
.file-name {
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.file-meta { font-size: 12px; color: var(--text-3); margin-top: 3px; }
.file-status { font-size: 12px; margin-top: 4px; }
.file-status.is-busy { color: var(--accent); }
.file-status.is-ok { color: var(--ok); }
.file-status.is-error { color: var(--danger); }

.file-actions { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.btn-icon {
  width: 30px;
  height: 30px;
  border: none;
  background: transparent;
  border-radius: 8px;
  color: var(--text-3);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  transition: background .15s, color .15s;
}
.btn-icon:hover { background: #f1f2f5; color: var(--danger); }

/* 按钮 */
.btn {
  border: none;
  border-radius: 10px;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s, transform .1s;
  font-family: inherit;
}
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--accent-hover); }
.btn-ghost { background: #fff; color: var(--text-2); border: 1px solid var(--border); }
.btn-ghost:hover:not(:disabled) { background: #f6f7f9; }
.btn-sm { padding: 7px 14px; font-size: 13px; }
.btn-download { background: var(--accent-soft); color: var(--accent); }

/* 操作栏 */
.actions { text-align: right; margin-top: 16px; }
.summary { color: var(--text-2); font-size: 13px; margin-bottom: 4px; text-align: left; }
.status { color: var(--accent); font-size: 13px; margin-bottom: 10px; text-align: left; min-height: 1.2em; }
.action-btns { display: flex; justify-content: flex-end; gap: 10px; flex-wrap: wrap; }

/* 页脚 */
.app-footer {
  text-align: center;
  color: var(--text-3);
  font-size: 12px;
  padding: 20px 16px 32px;
}