/* 全局样式 */
:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-color: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --radius: 12px;
    --transition: all 0.3s ease;

    /* 品牌颜色 */
    --github-color: #24292e;
    --google-color: #4285f4;
    --onedrive-color: #0078d4;
    --dropbox-color: #0061ff;
}

* {
    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-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
}

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

/* 头部 */
.header {
    text-align: center;
    padding: 40px 0 30px;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 8px;
    background: linear-gradient(135deg, var(--primary-color), #7c3aed);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* 存储选择区域 */
.storage-section {
    margin-bottom: 24px;
}

.storage-section h2 {
    font-size: 1.2rem;
    margin-bottom: 16px;
    color: var(--text-secondary);
}

.storage-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.storage-card {
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    padding: 20px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 12px;
}

.storage-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.storage-card.active {
    border-color: var(--success-color);
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.05), rgba(16, 185, 129, 0.1));
}

.storage-card.connected {
    border-color: var(--success-color);
}

.storage-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--github-color);
    color: white;
    border-radius: 12px;
    padding: 10px;
}

.storage-icon.google {
    background: var(--google-color);
}

.storage-icon.onedrive {
    background: var(--onedrive-color);
}

.storage-icon.dropbox {
    background: var(--dropbox-color);
}

.storage-icon svg {
    width: 100%;
    height: 100%;
}

.storage-info h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.storage-info p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.storage-status {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--border-color);
}

.storage-card.connected .status-dot {
    background: var(--success-color);
}

.storage-card.connected .status-text {
    color: var(--success-color);
}

/* 配置区域 */
.config-section {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 24px;
    overflow: hidden;
}

.config-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    background: linear-gradient(135deg, #f1f5f9, #e2e8f0);
    font-weight: 600;
}

.btn-close {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 4px 8px;
    border-radius: 4px;
    transition: var(--transition);
}

.btn-close:hover {
    background: rgba(0, 0, 0, 0.1);
    color: var(--text-color);
}

.config-body {
    padding: 20px;
}

/* OAuth 按钮 */
.oauth-section {
    text-align: center;
    padding: 20px 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 20px;
}

.oauth-section p {
    margin-bottom: 16px;
    color: var(--text-secondary);
}

.btn-oauth {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    color: white;
}

.btn-oauth.github {
    background: var(--github-color);
}

.btn-oauth.google {
    background: var(--google-color);
}

.btn-oauth.onedrive {
    background: var(--onedrive-color);
}

.btn-oauth.dropbox {
    background: var(--dropbox-color);
}

.btn-oauth:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    opacity: 0.9;
}

.btn-oauth svg {
    width: 20px;
    height: 20px;
}

.divider {
    display: flex;
    align-items: center;
    margin: 20px 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-color);
}

.divider span {
    padding: 0 16px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--text-color);
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-group small {
    display: block;
    margin-top: 6px;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.form-group small a {
    color: var(--primary-color);
    text-decoration: none;
}

.form-group small a:hover {
    text-decoration: underline;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), #7c3aed);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--border-color);
    color: var(--text-color);
}

.btn-secondary:hover {
    background: #cbd5e1;
}

.btn-copy {
    background: var(--success-color);
    color: white;
    padding: 8px 16px;
    font-size: 0.9rem;
}

.btn-copy:hover {
    background: #059669;
}

.btn-danger {
    background: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background: #dc2626;
}

.btn-small {
    padding: 6px 12px;
    font-size: 0.85rem;
}

.btn-group {
    display: flex;
    gap: 12px;
    margin-top: 16px;
}

/* 上传区域 */
.upload-section {
    margin-bottom: 24px;
}

.upload-area {
    background: var(--card-bg);
    border: 3px dashed var(--border-color);
    border-radius: var(--radius);
    padding: 60px 40px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.05), rgba(124, 58, 237, 0.05));
}

.upload-area.dragover {
    transform: scale(1.02);
}

.upload-icon {
    font-size: 4rem;
    margin-bottom: 16px;
}

.upload-text {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 8px;
}

.upload-hint {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* 进度条 */
.upload-progress {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
}

.progress-bar {
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 10px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), #7c3aed);
    width: 0%;
    transition: width 0.3s ease;
}

.progress-text {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* 结果区域 */
.result-section {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 24px;
    margin-bottom: 24px;
}

.result-section h2 {
    margin-bottom: 20px;
    font-size: 1.3rem;
}

.result-item {
    margin-bottom: 16px;
}

.result-item label {
    display: block;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.result-input-group {
    display: flex;
    gap: 10px;
}

.result-input-group input {
    flex: 1;
    padding: 10px 14px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.9rem;
    background: #f8fafc;
    color: var(--text-color);
}

.preview-area {
    margin-top: 20px;
    text-align: center;
}

.preview-area img {
    max-width: 100%;
    max-height: 300px;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

/* 历史记录 */
.history-section {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 24px;
    margin-bottom: 24px;
}

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

.history-header h2 {
    font-size: 1.3rem;
}

.history-list {
    display: grid;
    gap: 12px;
}

.empty-history {
    text-align: center;
    color: var(--text-secondary);
    padding: 40px;
}

.history-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: #f8fafc;
    border-radius: 8px;
    transition: var(--transition);
}

.history-item:hover {
    background: #f1f5f9;
}

.history-item img {
    width: 60px;
    height: 60px;
    object-fit: cover;
    border-radius: 6px;
}

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

.history-name {
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 4px;
}

.history-meta {
    display: flex;
    align-items: center;
    gap: 8px;
}

.history-time {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.history-storage {
    font-size: 0.75rem;
    padding: 2px 8px;
    border-radius: 4px;
    background: var(--border-color);
    color: var(--text-secondary);
}

.history-actions {
    display: flex;
    gap: 8px;
}

.history-actions button {
    padding: 6px 12px;
    font-size: 0.8rem;
}

/* 页脚 */
.footer {
    text-align: center;
    padding: 30px 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer a {
    color: var(--primary-color);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

/* Toast 提示 */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: #1e293b;
    color: white;
    padding: 14px 28px;
    border-radius: 8px;
    font-size: 0.95rem;
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 1000;
    box-shadow: var(--shadow-lg);
}

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

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

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

/* 用户信息 */
.user-info {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(16, 185, 129, 0.05));
    border-radius: 8px;
    margin-bottom: 16px;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
}

.user-details {
    flex: 1;
}

.user-name {
    font-weight: 600;
}

.user-email {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.btn-disconnect {
    padding: 6px 12px;
    font-size: 0.85rem;
    background: transparent;
    border: 1px solid var(--danger-color);
    color: var(--danger-color);
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition);
}

.btn-disconnect:hover {
    background: var(--danger-color);
    color: white;
}

/* 响应式 */
@media (max-width: 640px) {
    .container {
        padding: 15px;
    }

    .header h1 {
        font-size: 2rem;
    }

    .storage-grid {
        grid-template-columns: 1fr 1fr;
    }

    .storage-card {
        padding: 16px;
    }

    .storage-icon {
        width: 40px;
        height: 40px;
    }

    .upload-area {
        padding: 40px 20px;
    }

    .upload-icon {
        font-size: 3rem;
    }

    .result-input-group {
        flex-direction: column;
    }

    .result-input-group .btn {
        width: 100%;
    }

    .history-item {
        flex-direction: column;
        text-align: center;
    }

    .history-actions {
        width: 100%;
    }

    .history-actions button {
        flex: 1;
    }

    .form-row {
        grid-template-columns: 1fr;
    }
}

/* 加载动画 */
@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid #ffffff;
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-right: 8px;
}

/* 暗色模式支持 */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #0f172a;
        --card-bg: #1e293b;
        --text-color: #f1f5f9;
        --text-secondary: #94a3b8;
        --border-color: #334155;
    }

    .config-header {
        background: linear-gradient(135deg, #334155, #475569);
    }

    .config-header:hover {
        background: linear-gradient(135deg, #475569, #64748b);
    }

    .form-group input,
    .result-input-group input {
        background: #0f172a;
        color: var(--text-color);
    }

    .history-item {
        background: #0f172a;
    }

    .history-item:hover {
        background: #1e293b;
    }

    .storage-card {
        background: var(--card-bg);
    }
}