.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.modal-content {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 400px;
    padding: 30px;
    position: relative;
    box-shadow: var(--shadow-lg);
}

.modal-close {
    position: absolute;
    top: 15px;
    right: 15px;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-light);
    transition: color 0.2s;
}

.modal-close:hover {
    color: var(--text-primary);
}

.login-header,
.register-header {
    text-align: center;
    margin-bottom: 25px;
}

.login-header h1,
.register-header h1 {
    font-size: 22px;
    margin-bottom: 5px;
}

.login-header p,
.register-header p {
    color: var(--text-light);
    font-size: 13px;
}

.form-group {
    margin-bottom: 15px;
}

.form-group input {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 14px;
    outline: none;
    transition: border-color 0.2s;
}

.form-group input:focus {
    border-color: var(--primary-color);
}

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

.captcha-group input {
    flex: 1;
}

.captcha-group img {
    height: 42px;
    border-radius: var(--radius-sm);
    cursor: pointer;
}

.remember-me {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 20px;
    font-size: 13px;
    color: var(--text-secondary);
}

.btn-login,
.btn-register {
    width: 100%;
    padding: 12px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
}

.btn-login:hover,
.btn-register:hover {
    background: var(--primary-hover);
}

.login-footer,
.register-footer {
    text-align: center;
    margin-top: 20px;
    font-size: 13px;
}

.login-footer a,
.register-footer a {
    color: var(--text-secondary);
    text-decoration: none;
}

.login-footer a:hover,
.register-footer a:hover {
    color: var(--primary-color);
}

.alert {
    padding: 12px;
    border-radius: var(--radius-sm);
    margin-bottom: 15px;
    font-size: 13px;
}

.alert-error {
    background: #fef2f2;
    color: #dc2626;
    border: 1px solid #fee2e2;
}

.alert-success {
    background: #f0fdf4;
    color: #16a34a;
    border: 1px solid #bbf7d0;
}

.password-tips {
    font-size: 12px;
    color: var(--text-light);
    margin-top: 5px;
}

#search-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9998;
}

.search-container {
    width: 90%;
    max-width: 500px;
    position: relative;
}

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

.search-form input {
    flex: 1;
    padding: 15px 20px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 16px;
    outline: none;
}

.search-form button {
    padding: 15px 25px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 15px;
    transition: background 0.2s;
}

.search-form button:hover {
    background: var(--primary-hover);
}

#search-close {
    position: absolute;
    top: -40px;
    right: 0;
    color: white;
    font-size: 28px;
    cursor: pointer;
}

.mobile-menu {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.55);
    backdrop-filter: blur(3px);
    -webkit-backdrop-filter: blur(3px);
    z-index: 9998;
    display: none;
    opacity: 0;
    transition: opacity 0.25s ease;
}

.mobile-menu.active {
    display: block;
    opacity: 1;
}

.mobile-menu-content {
    position: absolute;
    top: 0;
    right: 0;
    width: 82%;
    max-width: 340px;
    height: 100%;
    background: var(--bg-primary, #ffffff);
    box-shadow: -4px 0 24px rgba(0, 0, 0, 0.12);
    transform: translateX(100%);
    transition: transform 0.3s cubic-bezier(0.32, 0.72, 0, 1);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.mobile-menu.active .mobile-menu-content {
    transform: translateX(0);
}

/* 深色模式适配 */
html.dark .mobile-menu-content {
    background: #1e293b;
}

/* 用户信息头部 */
.mobile-menu-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 18px 16px;
    background: linear-gradient(135deg, #3b82f6 0%, #6366f1 100%);
    color: #fff;
    flex-shrink: 0;
}

.mobile-menu-profile {
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 0;
}

.mobile-menu-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    overflow: hidden;
    flex-shrink: 0;
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.4);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.mobile-menu-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.mobile-menu-userinfo {
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 3px;
}

.mobile-menu-username {
    font-size: 15px;
    font-weight: 600;
    line-height: 1.3;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 180px;
}

.mobile-menu-subtitle {
    font-size: 12px;
    opacity: 0.85;
    line-height: 1.3;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 180px;
}

.mobile-menu-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    border-radius: 50%;
    color: #fff;
    cursor: pointer;
    transition: background 0.2s, transform 0.2s;
    flex-shrink: 0;
}

.mobile-menu-close:hover {
    background: rgba(255, 255, 255, 0.32);
    transform: rotate(90deg);
}

/* 快捷操作区 */
.mobile-menu-actions {
    padding: 14px 16px 8px;
    flex-shrink: 0;
}

.mobile-action-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.08), rgba(99, 102, 241, 0.05));
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: 10px;
    text-decoration: none;
    color: var(--text-primary, #1e293b);
    transition: all 0.2s;
}

.mobile-action-link:hover {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.15), rgba(99, 102, 241, 0.1));
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.15);
}

.mobile-action-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: #3b82f6;
    color: #fff;
    border-radius: 8px;
    flex-shrink: 0;
}

.mobile-action-text {
    flex: 1;
    font-size: 14px;
    font-weight: 500;
}

.mobile-action-arrow {
    font-size: 20px;
    color: var(--text-light, #94a3b8);
    font-weight: 300;
    line-height: 1;
}

/* 导航分组 */
.mobile-menu-group {
    padding: 8px 10px;
    margin: 0;
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
}

.mobile-menu-group + .mobile-menu-group {
    padding-top: 4px;
}

.mobile-menu-group-title {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-light, #94a3b8);
    text-transform: uppercase;
    letter-spacing: 0.8px;
    padding: 10px 14px 6px;
    line-height: 1.4;
}

.mobile-menu-group > a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 11px 14px;
    color: var(--text-primary, #1e293b);
    text-decoration: none;
    font-size: 14px;
    border-radius: 8px;
    transition: background 0.18s, color 0.18s;
    margin: 2px 0;
    position: relative;
}

.mobile-menu-link-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary, #64748b);
    opacity: 0.85;
    width: 20px;
    flex-shrink: 0;
}

.mobile-menu-group > a:hover {
    background: var(--bg-secondary, #f1f5f9);
}

.mobile-menu-group > a.active {
    background: rgba(59, 130, 246, 0.1);
    color: #3b82f6;
    font-weight: 500;
}

.mobile-menu-group > a.active .mobile-menu-link-icon {
    color: #3b82f6;
    opacity: 1;
}

.mobile-menu-group > a.mobile-subcategory-link {
    margin-left: 22px;
    padding: 9px 12px;
    font-size: 13px;
    color: var(--text-secondary, #64748b);
    background: rgba(148, 163, 184, 0.08);
}

.mobile-menu-group > a.mobile-subcategory-link .mobile-menu-link-icon {
    width: 16px;
    opacity: 0.65;
}

.mobile-menu-group > a.mobile-subcategory-link.active {
    color: #3b82f6;
    background: rgba(59, 130, 246, 0.12);
    font-weight: 600;
}

html.dark .mobile-menu-group > a:hover {
    background: rgba(255, 255, 255, 0.06);
}

html.dark .mobile-menu-group > a.mobile-subcategory-link {
    background: rgba(255, 255, 255, 0.04);
}

/* 底部设置区 */
.mobile-menu-footer {
    padding: 12px 16px 20px;
    border-top: 1px solid var(--border-color, #e2e8f0);
    flex-shrink: 0;
    background: var(--bg-secondary, #f1f5f9);
}

html.dark .mobile-menu-footer {
    background: rgba(15, 23, 42, 0.5);
}

.mobile-theme-toggle-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 11px 14px;
    background: var(--bg-primary, #ffffff);
    border: 1px solid var(--border-color, #e2e8f0);
    border-radius: 10px;
    text-decoration: none;
    color: var(--text-primary, #1e293b);
    transition: all 0.2s;
    margin-bottom: 12px;
}

.mobile-theme-toggle-btn:hover {
    border-color: rgba(59, 130, 246, 0.4);
    transform: translateY(-1px);
}

.mobile-theme-toggle-btn .mobile-action-icon {
    background: linear-gradient(135deg, #fbbf24, #f59e0b);
    color: #fff;
}

html.dark .mobile-theme-toggle-btn .mobile-action-icon {
    background: linear-gradient(135deg, #60a5fa, #3b82f6);
}

.mobile-theme-indicator {
    width: 36px;
    height: 20px;
    border-radius: 10px;
    background: #e2e8f0;
    position: relative;
    transition: background 0.3s;
    flex-shrink: 0;
}

.mobile-theme-indicator::before {
    content: '';
    position: absolute;
    top: 2px;
    right: 2px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: #fff;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s, background 0.3s;
}

html.dark .mobile-theme-indicator {
    background: #3b82f6;
}

html.dark .mobile-theme-indicator::before {
    transform: translateX(-16px);
}

.mobile-menu-brand {
    text-align: center;
    font-size: 11px;
    color: var(--text-light, #94a3b8);
    opacity: 0.7;
    padding-top: 4px;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.loading-text {
    margin-top: 15px;
    color: var(--text-light);
    font-size: 13px;
}

#infinite-scroll-trigger {
    text-align: center;
    padding: 30px;
}

@media (max-width: 768px) {
    .modal-content {
        padding: 20px;
        width: 95%;
    }

    #search-overlay .search-form input {
        padding: 12px 15px;
        font-size: 14px;
    }

    #search-overlay .search-form button {
        padding: 12px 18px;
        font-size: 14px;
    }

    #search-overlay #search-close {
        font-size: 36px;
        top: -50px;
    }
}