:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f5f5f5;
  --bg-card: #ffffff;
  --text-primary: #333333;
  --text-secondary: #666666;
  --border-color: #e0e0e0;
  --accent-color: #4a90e2;
  --accent-hover: #357abd;
  --success-color: #52c41a;
  --error-color: #ff4d4f;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
  --bg-primary: #1a1a1a;
  --bg-secondary: #2a2a2a;
  --bg-card: #2a2a2a;
  --text-primary: #e0e0e0;
  --text-secondary: #a0a0a0;
  --border-color: #404040;
  --accent-color: #5a9fd4;
  --accent-hover: #4a8fc4;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background 0.3s, color 0.3s;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 20px;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
  padding-bottom: 20px;
  border-bottom: 2px solid var(--border-color);
}

h1 {
  font-size: 28px;
  font-weight: 600;
}

h3 {
  font-size: 18px;
  margin-bottom: 15px;
  color: var(--text-primary);
}

.icon-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 10px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

.icon-btn:hover {
  background: var(--border-color);
}

.mode-selector {
  display: flex;
  gap: 10px;
  margin-bottom: 25px;
  background: var(--bg-secondary);
  padding: 5px;
  border-radius: 10px;
}

.mode-btn {
  flex: 1;
  padding: 12px 20px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  border-radius: 8px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 500;
  transition: all 0.2s;
}

.mode-btn.active {
  background: var(--accent-color);
  color: white;
}

.mode-content {
  display: none;
}

.mode-content.active {
  display: block;
}

.info-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 20px;
  margin-bottom: 25px;
  box-shadow: var(--shadow);
}

.info-card p {
  color: var(--text-secondary);
  font-size: 14px;
}

.user-info {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.user-info strong {
  color: var(--text-primary);
}

.user-info span {
  color: var(--accent-color);
  font-weight: 500;
}

.username-edit {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.username-edit input {
  flex: 1;
  min-width: 150px;
  padding: 8px 12px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 14px;
}

.small-btn {
  padding: 8px 16px;
  background: var(--accent-color);
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s;
}

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

.pin-setup, .allow-all-setup {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.pin-setup input[type="text"] {
  width: 100px;
  padding: 8px 12px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 14px;
}

.pin-setup input[type="text"]:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.peers-section, .connect-section {
  margin-bottom: 25px;
}

.peers-list {
  display: grid;
  gap: 10px;
}

.peer-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 15px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all 0.2s;
  box-shadow: var(--shadow);
}

.peer-item:hover {
  border-color: var(--accent-color);
  transform: translateY(-2px);
}

.peer-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.peer-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent-color);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 600;
}

.peer-details {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.peer-device {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

.peer-name {
  font-size: 13px;
  font-weight: 400;
  color: var(--text-secondary);
}

.peer-status {
  font-size: 12px;
  color: var(--success-color);
}

.connect-btn {
  background: var(--accent-color);
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s;
}

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

.connect-form {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.connect-form input {
  flex: 1;
  min-width: 150px;
  padding: 12px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 14px;
}

.connect-form button {
  padding: 12px 30px;
  background: var(--accent-color);
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 500;
  transition: all 0.2s;
}

.connect-form button:hover {
  background: var(--accent-hover);
}

.transfer-section {
  margin-top: 30px;
  padding-top: 30px;
  border-top: 2px solid var(--border-color);
}

.transfer-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  gap: 15px;
  margin-bottom: 20px;
}

.transfer-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 20px 10px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  transition: all 0.2s;
  font-size: 14px;
  color: var(--text-primary);
  box-shadow: var(--shadow);
}

.transfer-btn:hover {
  border-color: var(--accent-color);
  transform: translateY(-2px);
}

.transfer-btn svg {
  color: var(--accent-color);
}

.settings {
  margin-bottom: 20px;
  padding: 15px;
  background: var(--bg-secondary);
  border-radius: 8px;
}

.settings label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 14px;
}

.settings-inline {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 15px;
}

.settings-inline label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 14px;
}

.peer-count {
  display: inline-block;
  background: var(--accent-color);
  color: white;
  font-size: 12px;
  padding: 2px 10px;
  border-radius: 12px;
  font-weight: 600;
  margin-left: 8px;
}

.connection-status {
  font-size: 14px;
  color: var(--success-color);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 10px;
}

.connection-status.disconnected {
  color: var(--error-color);
}

.reconnect-btn {
  background: var(--accent-color);
  color: white;
  border: none;
  padding: 4px 12px;
  border-radius: 4px;
  font-size: 12px;
  cursor: pointer;
  transition: all 0.2s;
}

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

.transfer-header-section {
  margin-bottom: 20px;
}

.transfer-header-section h3 {
  display: flex;
  align-items: center;
  gap: 10px;
}

.transfer-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.transfer-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 15px;
  box-shadow: var(--shadow);
}

.transfer-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.transfer-name {
  font-weight: 500;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  word-break: break-all;
}

.compression-badge {
  display: inline-block;
  background: var(--success-color);
  color: white;
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 8px;
  font-weight: 600;
  white-space: nowrap;
  flex-shrink: 0;
}

.transfer-size {
  font-size: 13px;
  color: var(--text-secondary);
}

.transfer-progress {
  width: 100%;
  height: 6px;
  background: var(--bg-secondary);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 8px;
}

.transfer-progress-bar {
  height: 100%;
  background: var(--accent-color);
  transition: width 0.3s;
}

.transfer-status {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--text-secondary);
  gap: 10px;
  flex-wrap: wrap;
}

.status-text {
  flex: 1;
  min-width: 80px;
}

.transfer-speed {
  color: var(--accent-color);
  font-weight: 500;
  min-width: 80px;
  text-align: right;
  font-size: 12px;
}

.transfer-percent {
  min-width: 40px;
  text-align: right;
  font-weight: 500;
}

.transfer-actions {
  display: flex;
  gap: 8px;
  margin-top: 10px;
  justify-content: flex-end;
  flex-wrap: wrap;
}

.action-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 6px 16px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  transition: all 0.2s;
  color: var(--text-primary);
}

.action-btn:hover {
  background: var(--border-color);
  transform: translateY(-1px);
}

.pause-btn {
  border-color: var(--accent-color);
  color: var(--accent-color);
}

.pause-btn:hover {
  background: var(--accent-color);
  color: white;
}

.cancel-btn {
  border-color: var(--error-color);
  color: var(--error-color);
}

.cancel-btn:hover {
  background: var(--error-color);
  color: white;
}

.empty-state {
  text-align: center;
  color: var(--text-secondary);
  padding: 40px 20px;
  font-size: 14px;
}

@media (max-width: 768px) {
  .container {
    padding: 15px;
  }
  
  h1 {
    font-size: 24px;
  }
  
  .transfer-options {
    grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
  }
  
  .connect-form {
    flex-direction: column;
  }
  
  .connect-form input,
  .connect-form button {
    width: 100%;
  }
}