.settings-container {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.settings-tabs {
    display: flex;
    background: var(--color-gray-50);
    border-bottom: 2px solid var(--color-gray-200);
}

.tab-btn {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-gray-600);
    white-space: nowrap;
    transition: color 0.15s ease, background 0.15s ease;
    position: relative;
    transform: none !important;
}

.tab-btn.active {
    color: var(--color-primary);
    background: var(--color-white);
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--color-primary);
}

.tab-btn:hover:not(.active) {
    color: var(--color-gray-900);
    background: var(--color-gray-100);
}

.settings-content {
    padding: var(--spacing-2xl);
}

.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
}

.panel-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-xl);
}

.setting-group {
    margin-bottom: var(--spacing-xl);
}

.setting-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-gray-700);
    margin-bottom: var(--spacing-sm);
}

.setting-subtitle {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--color-gray-800);
    margin-bottom: var(--spacing-md);
}

.setting-subtitle.danger {
    color: var(--color-error);
}

.setting-description {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-md);
}

.setting-divider {
    height: 1px;
    background: var(--color-gray-200);
    margin: var(--spacing-xl) 0;
}

.theme-options {
    display: flex;
    gap: var(--spacing-lg);
}

.avatar-upload {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.avatar-preview {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-full);
    background: var(--color-primary);
    color: var(--color-white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-semibold);
}

.login-history {
    background: var(--color-gray-50);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
}

.history-item {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--color-gray-200);
}

.history-item:last-child {
    border-bottom: none;
}

.history-date,
.history-location,
.history-device {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
}

.storage-info {
    margin-bottom: var(--spacing-md);
}

.storage-bar {
    height: 8px;
    background: var(--color-gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.storage-used {
    height: 100%;
    background: var(--color-primary);
    transition: var(--transition-base);
}

.storage-text {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
}

.danger-zone {
    background: rgba(239, 68, 68, 0.05);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
}

.danger-zone button {
    margin-right: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.settings-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
    padding: var(--spacing-xl);
    background: var(--color-gray-50);
    border-top: 1px solid var(--color-gray-200);
}

.full-width {
    width: 100%;
}

@media (max-width: 768px) {
    .settings-tabs {
        flex-direction: column;
    }
    
    .tab-btn {
        text-align: left;
    }
    
    .theme-options {
        flex-direction: column;
    }
    
    .history-item {
        flex-direction: column;
        gap: var(--spacing-xs);
    }
    
    .settings-footer {
        flex-direction: column;
    }
    
    .settings-footer button {
        width: 100%;
    }
}

/* ========================================
   OAuth連携ステータス
   ======================================== */

.oauth-status {
    display: inline-block;
    font-size: 0.8em;
    padding: 3px 8px;
    border-radius: 4px;
    font-weight: 500;
}

.oauth-status.connected {
    background: linear-gradient(135deg, #e8f5e9 0%, #c8e6c9 100%);
    color: #2e7d32;
    border: 1px solid #a5d6a7;
}

.oauth-status.not-connected {
    background: linear-gradient(135deg, #fff3e0 0%, #ffe0b2 100%);
    color: #e65100;
    border: 1px solid #ffcc80;
}

/* トークン有効期限バッジ */
.token-badge {
    display: inline-block;
    font-size: 0.8em;
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: 500;
}

.token-badge.token-valid {
    background: #e8f5e9;
    color: #2e7d32;
}

.token-badge.token-expiring {
    background: #fff3e0;
    color: #e65100;
}

.token-badge.token-expired {
    background: #ffebee;
    color: #c62828;
}

.oauth-connect-btn,
.oauth-reconnect-btn {
    padding: 8px 12px;
    font-size: 0.85em;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    margin-right: 5px;
}

.oauth-connect-btn {
    background: linear-gradient(135deg, #42a5f5 0%, #1e88e5 100%);
    color: white;
}

.oauth-connect-btn:hover {
    background: linear-gradient(135deg, #64b5f6 0%, #42a5f5 100%);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(33, 150, 243, 0.4);
}

.oauth-reconnect-btn {
    background: linear-gradient(135deg, #78909c 0%, #546e7a 100%);
    color: white;
}

.oauth-reconnect-btn:hover {
    background: linear-gradient(135deg, #90a4ae 0%, #78909c 100%);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(84, 110, 122, 0.4);
}

/* ========================================
   アカウントグループ
   ======================================== */

.group-badge {
    display: inline-block;
    font-size: 0.75em;
    padding: 2px 8px;
    border-radius: 12px;
    font-weight: 500;
    background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%);
    color: #1565c0;
    border: 1px solid #90caf9;
}

.group-badge.group-none {
    background: linear-gradient(135deg, #f5f5f5 0%, #e0e0e0 100%);
    color: #757575;
    border: 1px solid #bdbdbd;
}

.group-edit-row .group-name-input {
    transition: border-color 0.2s ease;
}

.group-edit-row .group-name-input:focus {
    border-color: #42a5f5;
    outline: none;
    box-shadow: 0 0 0 2px rgba(66, 165, 245, 0.2);
}

.group-edit-row .save-group-btn:hover {
    background: #43a047 !important;
    transform: translateY(-1px);
}