:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #eef2ff;
  --bg: #f5f6fa;
  --card: #ffffff;
  --text: #1f2430;
  --text-secondary: #6b7280;
  --border: #e5e7eb;
  --success: #10b981;
  --error: #ef4444;
  --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(79, 70, 229, .14);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ---------- Header ---------- */
.header {
  background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 55%, #a855f7 100%);
  color: #fff;
  padding: 26px 20px 56px;
}
.header-inner {
  max-width: 1080px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
}
.logo { display: flex; align-items: center; gap: 14px; }
.logo-icon {
  font-size: 34px;
  width: 58px; height: 58px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(255, 255, 255, .18);
  border-radius: 16px;
  backdrop-filter: blur(4px);
}
.logo h1 { font-size: 22px; font-weight: 700; letter-spacing: .5px; }
.subtitle { font-size: 13px; opacity: .88; margin-top: 2px; }
.privacy-badge {
  display: flex; align-items: center; gap: 7px;
  background: rgba(255, 255, 255, .16);
  border: 1px solid rgba(255, 255, 255, .3);
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 13px;
  backdrop-filter: blur(4px);
}

/* ---------- Layout ---------- */
.main {
  max-width: 1080px;
  width: 100%;
  margin: -34px auto 40px;
  padding: 0 20px;
  flex: 1;
}

/* ---------- Upload ---------- */
.upload-zone {
  background: var(--card);
  border: 2px dashed #d6d9e4;
  border-radius: var(--radius);
  padding: 46px 24px;
  text-align: center;
  cursor: pointer;
  transition: border-color .2s, box-shadow .2s, background .2s;
  box-shadow: var(--shadow);
}
.upload-zone:hover, .upload-zone.dragover {
  border-color: var(--primary);
  background: var(--primary-light);
  box-shadow: var(--shadow-lg);
}
.upload-zone.dragover { transform: scale(1.005); }
.upload-icon { color: var(--primary); margin-bottom: 14px; }
.upload-title { font-size: 17px; font-weight: 600; margin-bottom: 6px; }
.upload-hint { font-size: 13px; color: var(--text-secondary); margin-bottom: 18px; }
.format-chips { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; max-width: 760px; margin: 0 auto; }
.chip {
  font-size: 11.5px;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--primary-light);
  color: var(--primary-dark);
  border: 1px solid #dfe3ff;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
}

/* ---------- Toolbar ---------- */
.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin: 18px 2px 12px;
}
.toolbar-left { font-size: 14px; color: var(--text-secondary); }
.toolbar-right { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 7px;
  border: none; cursor: pointer;
  font-size: 13.5px; font-weight: 500;
  padding: 9px 16px;
  border-radius: 10px;
  transition: background .15s, transform .05s;
  font-family: inherit;
}
.btn:active { transform: scale(.97); }
.btn-primary {
  background: var(--primary);
  color: #fff;
}
.btn-primary:hover { background: var(--primary-dark); }
.btn-primary:disabled { background: #c7c9d9; cursor: not-allowed; }
.btn-ghost {
  background: #fff;
  color: var(--text-secondary);
  border: 1px solid var(--border);
}
.btn-ghost:hover { color: var(--error); border-color: #fecaca; background: #fef2f2; }
.btn-sm { padding: 6px 11px; font-size: 12.5px; border-radius: 8px; }

/* 开关 */
.switch-label {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; color: var(--text-secondary);
  cursor: pointer; user-select: none;
  background: #fff; border: 1px solid var(--border);
  padding: 8px 14px; border-radius: 10px;
}
.switch-label input { display: none; }
.switch {
  width: 34px; height: 19px;
  background: #d1d5db;
  border-radius: 999px;
  position: relative;
  transition: background .2s;
  flex: none;
}
.switch::after {
  content: '';
  position: absolute;
  top: 2px; left: 2px;
  width: 15px; height: 15px;
  background: #fff;
  border-radius: 50%;
  transition: left .2s;
  box-shadow: 0 1px 2px rgba(0, 0, 0, .2);
}
.switch-label input:checked + .switch { background: var(--primary); }
.switch-label input:checked + .switch::after { left: 17px; }

/* ---------- Results table ---------- */
.results { background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; }
.table-wrap { overflow-x: auto; }
.file-table { width: 100%; border-collapse: collapse; min-width: 760px; }
.file-table th {
  text-align: left;
  font-size: 12px; font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase; letter-spacing: .4px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  background: #fafbfd;
  white-space: nowrap;
}
.file-table td {
  padding: 12px 16px;
  border-bottom: 1px solid #f0f1f5;
  font-size: 13.5px;
  vertical-align: middle;
}
.file-table tr:last-child td { border-bottom: none; }
.file-table tr:hover td { background: #fafbff; }

.col-cover { width: 56px; }
.cover {
  width: 44px; height: 44px;
  border-radius: 8px;
  object-fit: cover;
  background: linear-gradient(135deg, #e0e7ff, #f3e8ff);
  display: flex; align-items: center; justify-content: center;
  font-size: 19px;
  color: #a5b4fc;
}
.cover img { width: 100%; height: 100%; object-fit: cover; border-radius: 8px; }

.col-title { min-width: 200px; max-width: 320px; }
.cell-title {
  font-weight: 600;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.cell-filename {
  font-size: 11.5px; color: var(--text-secondary);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  margin-top: 2px;
}
.cell-artist, .cell-album {
  color: var(--text-secondary);
  max-width: 170px;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.ext-badge {
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 11.5px; font-weight: 700;
  text-transform: uppercase;
  background: var(--primary-light);
  color: var(--primary-dark);
  padding: 3px 8px;
  border-radius: 6px;
}
.cell-size { color: var(--text-secondary); font-variant-numeric: tabular-nums; white-space: nowrap; }

.row-error td { background: #fef2f2 !important; }
.error-text { color: var(--error); font-size: 12.5px; display: flex; align-items: center; gap: 6px; }

.progress-bar {
  width: 100%; max-width: 260px;
  height: 5px;
  background: #eef0f6;
  border-radius: 999px;
  overflow: hidden;
}
.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), #a855f7);
  border-radius: 999px;
  transition: width .2s;
}
.status-text { font-size: 12px; color: var(--text-secondary); margin-top: 5px; }

.actions { display: flex; gap: 6px; align-items: center; }
.icon-btn {
  width: 32px; height: 32px;
  display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 8px;
  cursor: pointer;
  color: var(--text-secondary);
  transition: all .15s;
}
.icon-btn:hover { color: var(--primary); border-color: var(--primary); background: var(--primary-light); }
.icon-btn.danger:hover { color: var(--error); border-color: #fecaca; background: #fef2f2; }
.icon-btn:disabled { opacity: .45; cursor: not-allowed; }
.icon-btn.playing { color: #fff; background: var(--primary); border-color: var(--primary); }

/* ---------- Formats card ---------- */
.formats-card {
  margin-top: 22px;
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px 26px;
}
.formats-card h2 { font-size: 16px; margin-bottom: 16px; }
.format-groups { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 14px; }
.format-group h3 {
  font-size: 13px;
  color: var(--primary-dark);
  margin-bottom: 6px;
  display: flex; align-items: center; gap: 6px;
}
.format-group p {
  font-size: 12.5px;
  color: var(--text-secondary);
  line-height: 1.7;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  word-break: break-all;
}
.formats-note {
  margin-top: 18px;
  font-size: 12.5px;
  color: var(--text-secondary);
  line-height: 1.8;
}
.formats-note code { background: var(--primary-light); padding: 1px 5px; border-radius: 4px; font-size: 11.5px; }
.formats-note a { color: var(--primary-dark); }

/* ---------- Footer ---------- */
.footer {
  text-align: center;
  padding: 20px;
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 2;
}
.footer a { color: var(--primary-dark); }
.footer code { background: var(--primary-light); padding: 1px 5px; border-radius: 4px; }

/* ---------- Toast ---------- */
.toast-container {
  position: fixed;
  bottom: 24px; left: 50%;
  transform: translateX(-50%);
  display: flex; flex-direction: column; gap: 8px;
  z-index: 1000;
  align-items: center;
}
.toast {
  background: #1f2430;
  color: #fff;
  padding: 11px 20px;
  border-radius: 10px;
  font-size: 13px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, .18);
  animation: toastIn .25s ease;
  max-width: min(90vw, 520px);
  display: flex; align-items: center; gap: 8px;
}
.toast.error { background: #b91c1c; }
.toast.success { background: #047857; }
@keyframes toastIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
  .upload-zone { padding: 34px 14px; }
  .toolbar { justify-content: center; }
  .logo h1 { font-size: 19px; }
}