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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            overflow: hidden;
        }

        .login-container {
            width: 100vw;
            height: 100vh;
            display: flex;
            position: relative;
        }

        .login-background {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            z-index: 0;
        }

        .excel-animation {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            overflow: hidden;
            z-index: 1;
        }

        .excel-icon {
            position: absolute;
            font-size: 48px;
            color: rgba(255, 255, 255, 0.6);
            animation: float 20s infinite linear;
        }

        .excel-icon:nth-child(1) { left: 10%; top: 20%; animation-duration: 25s; }
        .excel-icon:nth-child(2) { left: 80%; top: 10%; animation-duration: 20s; animation-delay: -5s; }
        .excel-icon:nth-child(3) { left: 60%; top: 70%; animation-duration: 30s; animation-delay: -10s; }
        .excel-icon:nth-child(4) { left: 20%; top: 80%; animation-duration: 22s; animation-delay: -15s; }
        .excel-icon:nth-child(5) { left: 40%; top: 40%; animation-duration: 28s; animation-delay: -8s; }
        .excel-icon:nth-child(6) { left: 70%; top: 50%; animation-duration: 24s; animation-delay: -12s; }
        .excel-icon:nth-child(7) { left: 30%; top: 60%; animation-duration: 26s; animation-delay: -3s; }
        .excel-icon:nth-child(8) { left: 85%; top: 75%; animation-duration: 21s; animation-delay: -7s; }

        @keyframes float {
            0% {
                transform: translateY(100vh) rotate(0deg);
                opacity: 0;
            }
            10% {
                opacity: 0.6;
            }
            90% {
                opacity: 0.6;
            }
            100% {
                transform: translateY(-100vh) rotate(720deg);
                opacity: 0;
            }
        }

        .login-box {
            position: absolute;
            right: 10%;
            top: 50%;
            transform: translateY(-50%);
            width: 400px;
            background: rgba(255, 255, 255, 0.95);
            border-radius: 16px;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
            padding: 40px;
            z-index: 10;
            backdrop-filter: blur(10px);
        }

        .login-header {
            text-align: center;
            margin-bottom: 30px;
        }

        .login-header h1 {
            font-size: 28px;
            color: #1e9fff;
            margin-bottom: 10px;
            font-weight: 600;
        }

        .login-header p {
            font-size: 14px;
            color: #666;
        }

        .login-form {
            margin-top: 20px;
        }

        .form-item {
            margin-bottom: 20px;
        }

        .form-item label {
            display: block;
            margin-bottom: 8px;
            color: #333;
            font-weight: 500;
        }

        .layui-input {
            height: 45px !important;
            border-radius: 8px !important;
            border: 1px solid #ddd !important;
            font-size: 14px !important;
            padding-left: 15px !important;
            transition: all 0.3s;
        }

        .layui-input:focus {
            border-color: #1e9fff !important;
            box-shadow: 0 0 0 3px rgba(30, 159, 255, 0.1);
        }

        .layui-icon {
            font-size: 18px;
            color: #999;
        }

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

        .code-input .layui-input {
            flex: 1;
        }

        .code-input .layui-form-item {
            margin-bottom: 0;
        }

        .code-img {
            height: 45px;
            border-radius: 8px;
            cursor: pointer;
            border: 1px solid #ddd;
        }

        .btn-login {
            width: 100%;
            height: 45px;
            border-radius: 8px;
            background: linear-gradient(135deg, #1e9fff 0%, #1177ee 100%);
            border: none;
            color: #fff;
            font-size: 16px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.3s;
            margin-top: 10px;
        }

        .btn-login:hover {
            background: linear-gradient(135deg, #1177ee 0%, #1e9fff 100%);
            transform: translateY(-2px);
            box-shadow: 0 5px 20px rgba(30, 159, 255, 0.4);
        }

        .login-footer {
            margin-top: 25px;
            text-align: center;
            color: #999;
            font-size: 12px;
        }

        .login-footer a {
            color: #1e9fff;
            text-decoration: none;
        }

        .remember-me {
            margin-top: 15px;
        }

        @media (max-width: 768px) {
            .login-box {
                right: 5%;
                width: calc(100% - 10%);
                max-width: 400px;
            }
        }

        .left-content {
            position: absolute;
            left: 8%;
            top: 50%;
            transform: translateY(-50%);
            z-index: 10;
            color: #fff;
            max-width: 500px;
        }

        .left-content h2 {
            font-size: 42px;
            margin-bottom: 20px;
            font-weight: 700;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
        }

        .left-content p {
            font-size: 18px;
            line-height: 1.8;
            opacity: 0.9;
            text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
        }

        .feature-list {
            margin-top: 30px;
            list-style: none;
        }

        .feature-list li {
            margin-bottom: 15px;
            font-size: 16px;
            display: flex;
            align-items: center;
        }

        .feature-list li::before {
            content: "✓";
            display: inline-block;
            width: 24px;
            height: 24px;
            background: rgba(255, 255, 255, 0.2);
            border-radius: 50%;
            text-align: center;
            line-height: 24px;
            margin-right: 12px;
            font-size: 14px;
        }