* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary: #1a5fb4;
            --primary-dark: #0d3d7a;
            --primary-light: #e8f0fb;
            --primary-hover: #15509e;
            --success: #1a7f37;
            --success-bg: #e6f4ea;
            --danger: #c0392b;
            --danger-bg: #fdecea;
            --info: #1a5fb4;
            --info-bg: #e8f0fb;
            --border: #d0d7de;
            --bg: #f5f7fa;
            --card-bg: #ffffff;
            --text: #1f2328;
            --text-light: #57606a;
            --nav-height: 64px;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background: var(--bg);
            min-height: 100vh;
            color: var(--text);
            font-size: 14px;
            line-height: 1.6;
        }

        .navbar {
            background: var(--card-bg);
            border-bottom: 1px solid var(--border);
            height: var(--nav-height);
            display: flex;
            align-items: center;
            padding: 0 32px;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 1px 2px rgba(0,0,0,0.04);
        }
        .navbar-inner {
            max-width: 1200px;
            width: 100%;
            margin: 0 auto;
            display: flex;
            align-items: center;
        }
        .navbar-brand {
            display: flex;
            align-items: center;
            text-decoration: none;
            color: var(--text);
        }
        .navbar-brand img {
            height: 36px;
            width: auto;
            margin-right: 12px;
            display: block;
        }
        .navbar-brand .brand-divider {
            width: 1px;
            height: 24px;
            background: var(--border);
            margin: 0 12px;
        }
        .navbar-brand .brand-text {
            font-size: 16px;
            font-weight: 600;
            color: var(--text);
            letter-spacing: 0.5px;
        }

        .main-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 32px;
        }
        .page-header {
            margin-bottom: 24px;
        }
        .page-header h1 {
            font-size: 22px;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 4px;
        }
        .page-header p {
            font-size: 14px;
            color: var(--text-light);
        }

        .card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: 0;
            margin-bottom: 24px;
        }
        .card-header {
            padding: 16px 24px;
            border-bottom: 1px solid var(--border);
            background: #fafbfc;
            display: flex;
            align-items: center;
        }
        .card-header h2 {
            font-size: 15px;
            font-weight: 600;
            color: var(--text);
        }
        .card-header .card-header-icon {
            width: 18px;
            height: 18px;
            margin-right: 10px;
            fill: var(--primary);
            flex-shrink: 0;
        }
        .card-body {
            padding: 24px;
        }

        .form-group {
            margin-bottom: 20px;
        }
        .form-group label {
            display: block;
            font-size: 13px;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 8px;
        }
        .form-group label .required {
            color: var(--danger);
            margin-left: 2px;
        }
        .form-control {
            width: 100%;
            padding: 10px 14px;
            font-size: 14px;
            border: 1px solid var(--border);
            border-radius: 0;
            outline: none;
            transition: border-color 0.2s, box-shadow 0.2s;
            background: #fff;
            color: var(--text);
            font-family: inherit;
        }
        .form-control:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(26, 95, 180, 0.12);
        }
        .form-control::placeholder {
            color: #9aa4af;
        }
        .form-hint {
            margin-top: 6px;
            font-size: 12px;
            color: var(--text-light);
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 10px 24px;
            font-size: 14px;
            font-weight: 600;
            border: 1px solid transparent;
            border-radius: 0;
            cursor: pointer;
            transition: background 0.2s, border-color 0.2s;
            font-family: inherit;
            letter-spacing: 0.3px;
            text-decoration: none;
        }
        .btn-primary {
            background: var(--primary);
            border-color: var(--primary);
            color: #fff;
        }
        .btn-primary:hover {
            background: var(--primary-hover);
            border-color: var(--primary-hover);
        }
        .btn-primary:active {
            background: var(--primary-dark);
        }
        .btn-primary:disabled {
            opacity: 0.6;
            cursor: not-allowed;
        }
        .btn-block {
            width: 100%;
        }
        .btn .loading-spinner {
            display: none;
            width: 16px;
            height: 16px;
            border: 2px solid rgba(255,255,255,0.35);
            border-top-color: #fff;
            border-radius: 50%;
            animation: spin 0.7s linear infinite;
            margin-right: 8px;
        }
        .btn.loading .loading-spinner {
            display: inline-block;
        }
        @keyframes spin {
            to { transform: rotate(360deg); }
        }

        .alert {
            padding: 12px 16px;
            border-radius: 0;
            font-size: 13px;
            display: flex;
            align-items: flex-start;
            margin-bottom: 20px;
            border: 1px solid transparent;
            line-height: 1.5;
        }
        .alert svg {
            width: 16px;
            height: 16px;
            margin-right: 10px;
            flex-shrink: 0;
            margin-top: 2px;
        }
        .alert-danger {
            background: var(--danger-bg);
            border-color: #f5c6cb;
            color: #86181d;
        }
        .alert-danger svg { fill: #86181d; }
        .alert-info {
            background: var(--info-bg);
            border-color: #c4d9f0;
            color: #0c3d6e;
        }
        .alert-info svg { fill: #0c3d6e; }

        .result-panel {
            border: 1px solid var(--border);
            border-radius: 0;
            overflow: hidden;
            animation: fadeIn 0.3s ease;
        }
        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }
        .result-panel .result-status-bar {
            padding: 14px 20px;
            display: flex;
            align-items: center;
            font-weight: 600;
            font-size: 15px;
            color: #fff;
        }
        .result-panel.success .result-status-bar {
            background: var(--success);
        }
        .result-panel.fail .result-status-bar {
            background: var(--danger);
        }
        .result-panel.info .result-status-bar {
            background: var(--info);
        }
        .result-panel .result-status-bar svg {
            width: 20px;
            height: 20px;
            fill: #fff;
            margin-right: 10px;
            flex-shrink: 0;
        }
        .result-panel .result-body {
            padding: 20px;
            background: #fff;
        }
        .result-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 13px;
        }
        .result-table tr {
            border-bottom: 1px solid #eef1f4;
        }
        .result-table tr:last-child {
            border-bottom: none;
        }
        .result-table td {
            padding: 12px 0;
            vertical-align: top;
        }
        .result-table td.label {
            width: 120px;
            color: var(--text-light);
            font-weight: 500;
            padding-right: 16px;
        }
        .result-table td.value {
            color: var(--text);
            font-weight: 500;
            word-break: break-all;
        }
        .result-table td.value .domain-highlight {
            color: var(--primary);
            font-weight: 600;
        }
        .status-badge {
            display: inline-block;
            padding: 2px 10px;
            font-size: 12px;
            font-weight: 600;
            border-radius: 0;
            line-height: 1.8;
        }
        .status-badge.success {
            background: var(--success-bg);
            color: var(--success);
            border: 1px solid #b7e0c0;
        }
        .status-badge.fail {
            background: var(--danger-bg);
            color: var(--danger);
            border: 1px solid #f5c6cb;
        }

        .footer {
            border-top: 1px solid var(--border);
            background: var(--card-bg);
            padding: 20px 32px;
            text-align: center;
            font-size: 12px;
            color: var(--text-light);
            margin-top: 40px;
        }
        .footer-inner {
            max-width: 1200px;
            margin: 0 auto;
        }

        @media (max-width: 768px) {
            .navbar {
                padding: 0 16px;
            }
            .navbar-brand .brand-text {
                font-size: 14px;
            }
            .main-container {
                padding: 16px;
            }
            .card-body {
                padding: 16px;
            }
            .result-table td.label {
                width: 90px;
                font-size: 12px;
            }
        }