:root {
  --bg: #f5f7fa;
  --card: #ffffff;
  --text: #1f2933;
  --muted: #7b8794;
  --primary: #2f6fed;
  --primary-dark: #1f5bd6;
  --border: #e4e7eb;
  --success: #2bb673;
  --danger: #e0564f;
  --shadow: 0 6px 24px rgba(31, 41, 51, 0.08);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.hero {
  text-align: center;
  padding: 40px 20px 24px;
  background: linear-gradient(135deg, #2f6fed 0%, #5b8def 100%);
  color: #fff;
}
.hero h1 { margin: 0 0 8px; font-size: 28px; }
.subtitle { margin: 0; opacity: 0.92; font-size: 15px; }
.subtitle strong { color: #fff; }

.container { max-width: 760px; margin: 0 auto; padding: 24px 16px 48px; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 20px;
  margin-bottom: 20px;
}

.dropzone {
  border: 2px dashed var(--border);
  border-radius: 12px;
  padding: 36px 16px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  outline: none;
}
.dropzone:hover, .dropzone:focus { border-color: var(--primary); background: #f0f5ff; }
.dropzone.dragover { border-color: var(--primary); background: #e8f0ff; }
.dropzone-inner .icon { font-size: 40px; }
.dz-title { font-size: 16px; font-weight: 600; margin: 8px 0 4px; }
.dz-hint { color: var(--muted); font-size: 13px; margin: 0; }

.options {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  margin: 18px 0;
}
.opt { display: flex; flex-direction: column; gap: 6px; font-size: 14px; color: var(--text); }
.opt select, .opt input[type="range"] { min-width: 180px; }
.opt select { padding: 6px 8px; border: 1px solid var(--border); border-radius: 8px; }

.actions { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  padding: 10px 18px;
  border-radius: 10px;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.15s;
}
.btn:hover:not(:disabled) { border-color: var(--primary); color: var(--primary); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--primary-dark); color: #fff; }
.btn-ghost { background: transparent; }

.list-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  margin-bottom: 12px;
}
.stat { color: var(--muted); font-weight: 500; font-size: 13px; }

.file-list { list-style: none; margin: 0; padding: 0; }
.empty-tip { color: var(--muted); text-align: center; padding: 18px 0; }

.file-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 4px;
  border-bottom: 1px solid var(--border);
}
.file-item:last-child { border-bottom: none; }
.thumb {
  width: 56px; height: 56px;
  border-radius: 8px;
  object-fit: cover;
  background: #eef1f5;
  border: 1px solid var(--border);
  flex-shrink: 0;
}
.file-meta { flex: 1; min-width: 0; }
.file-name {
  font-size: 14px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.file-sub { font-size: 12px; color: var(--muted); }
.status { font-size: 13px; font-weight: 600; flex-shrink: 0; }
.status.wait { color: var(--muted); }
.status.running { color: var(--primary); }
.status.done { color: var(--success); }
.status.error { color: var(--danger); }

.file-item .dl {
  border: none;
  background: var(--primary);
  color: #fff;
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 13px;
  cursor: pointer;
  text-decoration: none;
  flex-shrink: 0;
}
.file-item .dl:hover { background: var(--primary-dark); }
.file-item .dl:disabled { background: #c3ccd9; cursor: not-allowed; }

.privacy-note {
  text-align: center;
  color: var(--muted);
  font-size: 13px;
  margin-top: 8px;
}