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

:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface-hover: #222632;
  --border: #2a2f3d;
  --text: #e8eaed;
  --text-muted: #8b919e;
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --success: #22c55e;
  --danger: #ef4444;
  --radius: 12px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
    'Microsoft YaHei', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 24px;
}

header {
  text-align: center;
  margin-bottom: 36px;
}

header h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.subtitle {
  color: var(--text-muted);
  margin-top: 8px;
  font-size: 0.95rem;
}

.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  background: var(--surface);
}

.upload-zone:hover,
.upload-zone.dragover {
  border-color: var(--accent);
  background: var(--surface-hover);
}

.upload-icon {
  color: var(--text-muted);
  margin-bottom: 16px;
}

.upload-zone.dragover .upload-icon,
.upload-zone:hover .upload-icon {
  color: var(--accent);
}

.upload-text {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.link {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.progress-area {
  margin-top: 20px;
}

.progress-bar {
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: var(--accent);
  border-radius: 3px;
  transition: width 0.3s;
}

.progress-text {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-top: 8px;
}

.files-section {
  margin-top: 40px;
}

.files-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.files-header h2 {
  font-size: 1.15rem;
  font-weight: 600;
}

.btn {
  padding: 8px 16px;
  border: none;
  border-radius: 8px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
  font-family: inherit;
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  background: var(--surface-hover);
  color: var(--text);
}

.btn-download {
  background: var(--accent);
  color: #fff;
  padding: 6px 14px;
  font-size: 0.8rem;
}

.btn-download:hover {
  background: var(--accent-hover);
}

.btn-delete {
  background: transparent;
  color: var(--danger);
  border: 1px solid transparent;
  padding: 6px 10px;
  font-size: 0.8rem;
}

.btn-delete:hover {
  background: rgba(239, 68, 68, 0.1);
  border-color: rgba(239, 68, 68, 0.3);
}

.files-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.file-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: background 0.2s;
}

.file-item:hover {
  background: var(--surface-hover);
}

.file-info {
  flex: 1;
  min-width: 0;
}

.file-name {
  font-size: 0.9rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-meta {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.file-actions {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
  margin-left: 16px;
}

.empty-state {
  text-align: center;
  color: var(--text-muted);
  padding: 32px;
  font-size: 0.9rem;
}

.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 0.9rem;
  opacity: 0;
  transition: transform 0.3s, opacity 0.3s;
  pointer-events: none;
  z-index: 100;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

.toast.success {
  border-color: var(--success);
}

.toast.error {
  border-color: var(--danger);
}

@media (max-width: 480px) {
  .container {
    padding: 32px 16px;
  }

  .file-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .file-actions {
    margin-left: 0;
    width: 100%;
  }

  .file-actions .btn {
    flex: 1;
    text-align: center;
  }
}