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

        :root {
            --primary: #0066cc;
            --primary-dark: #004d99;
            --secondary: #00a8cc;
            --accent: #ff6b35;
            --text: #333;
            --text-light: #666;
            --bg: #ffffff;
            --bg-light: #f8f9fa;
            --border: #e0e0e0;
            --success: #28a745;
            --error: #dc3545;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            background: linear-gradient(135deg, #0066cc 0%, #00a8cc 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 1rem;
            position: relative;
            overflow: hidden;
        }

        body::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-image: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="100" height="100" patternUnits="userSpaceOnUse"><path d="M 100 0 L 0 0 0 100" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
            opacity: 0.3;
        }

        .signin-container {
            background: white;
            border-radius: 20px;
            box-shadow: 0 20px 60px rgba(0,0,0,0.3);
            overflow: hidden;
            max-width: 1000px;
            width: 100%;
            display: grid;
            grid-template-columns: 1fr 1fr;
            position: relative;
            z-index: 1;
        }

        .signin-left {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: white;
            padding: 3rem;
            display: flex;
            flex-direction: column;
            justify-content: center;
            position: relative;
            overflow: hidden;
        }

        .signin-left::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
        }

        .logo {
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: 2rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            position: relative;
            z-index: 1;
        }

        .signin-left h2 {
            font-size: 2rem;
            margin-bottom: 1rem;
            font-weight: 700;
            position: relative;
            z-index: 1;
        }

        .signin-left p {
            font-size: 1.1rem;
            opacity: 0.95;
            line-height: 1.6;
            position: relative;
            z-index: 1;
        }

        .signin-right {
            padding: 3rem;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

        .signin-header {
            text-align: center;
            margin-bottom: 2rem;
        }

        .signin-header h1 {
            color: var(--text);
            font-size: 1.8rem;
            margin-bottom: 0.5rem;
        }

        .signin-header p {
            color: var(--text-light);
        }

        .role-selector {
            display: flex;
            gap: 0.5rem;
            margin-bottom: 2rem;
            background: var(--bg-light);
            padding: 0.5rem;
            border-radius: 10px;
        }

        .role-btn {
            flex: 1;
            padding: 0.8rem;
            border: none;
            background: transparent;
            border-radius: 8px;
            cursor: pointer;
            font-weight: 600;
            color: var(--text-light);
            transition: all 0.3s ease;
        }

        .role-btn:hover {
            background: rgba(0, 102, 204, 0.1);
            color: var(--primary);
        }

        .role-btn.active {
            background: white;
            color: var(--primary);
            box-shadow: 0 2px 8px rgba(0,0,0,0.1);
        }

        .signin-form {
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
        }

        .form-group {
            position: relative;
        }

        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            color: var(--text);
            font-weight: 600;
            font-size: 0.9rem;
        }

        .input-wrapper {
            position: relative;
        }

        .input-icon {
            position: absolute;
            left: 1rem;
            top: 50%;
            transform: translateY(-50%);
            color: var(--text-light);
            font-size: 1.2rem;
        }

        .form-group input {
            width: 100%;
            padding: 0.9rem 1rem 0.9rem 3rem;
            border: 2px solid var(--border);
            border-radius: 10px;
            font-size: 1rem;
            transition: all 0.3s ease;
        }

        .form-group input:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
        }

        .toggle-password {
            position: absolute;
            right: 1rem;
            top: 50%;
            transform: translateY(-50%);
            background: none;
            border: none;
            cursor: pointer;
            color: var(--text-light);
            font-size: 1.2rem;
        }

        .form-options {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .checkbox-group {
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .checkbox-group input[type="checkbox"] {
            width: 18px;
            height: 18px;
            cursor: pointer;
        }

        .checkbox-group label {
            margin: 0;
            font-weight: 400;
            color: var(--text);
            cursor: pointer;
        }

        .forgot-password {
            color: var(--primary);
            text-decoration: none;
            font-weight: 600;
            font-size: 0.9rem;
        }

        .forgot-password:hover {
            text-decoration: underline;
        }

        .btn-signin {
            padding: 1rem;
            background: var(--primary);
            color: white;
            border: none;
            border-radius: 10px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .btn-signin:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(0, 102, 204, 0.3);
        }

        .btn-signin:active {
            transform: translateY(0);
        }

        .divider {
            text-align: center;
            color: var(--text-light);
            position: relative;
            margin: 1.5rem 0;
        }

        .divider::before,
        .divider::after {
            content: '';
            position: absolute;
            top: 50%;
            width: 45%;
            height: 1px;
            background: var(--border);
        }

        .divider::before {
            left: 0;
        }

        .divider::after {
            right: 0;
        }

        .social-signin {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }

        .btn-social {
            padding: 0.9rem;
            border: 2px solid var(--border);
            background: white;
            border-radius: 10px;
            cursor: pointer;
            font-weight: 600;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 0.8rem;
            transition: all 0.3s ease;
        }

        .btn-social:hover {
            border-color: var(--primary);
            background: var(--bg-light);
        }

        .btn-social img {
            width: 20px;
            height: 20px;
        }

        .signup-link {
            text-align: center;
            margin-top: 1.5rem;
            color: var(--text-light);
        }

        .signup-link a {
            color: var(--primary);
            text-decoration: none;
            font-weight: 600;
        }

        .signup-link a:hover {
            text-decoration: underline;
        }

        .back-home {
            position: absolute;
            top: 1.5rem;
            left: 1.5rem;
            color: white;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-weight: 600;
            z-index: 10;
            padding: 0.5rem 1rem;
            border-radius: 8px;
            transition: all 0.3s ease;
        }

        .back-home:hover {
            background: rgba(255,255,255,0.1);
        }

        .alert {
            padding: 1rem;
            border-radius: 10px;
            margin-bottom: 1rem;
            display: none;
        }

        .alert.show {
            display: block;
            animation: slideDown 0.3s ease;
        }

        .alert-error {
            background: #ffe6e6;
            color: var(--error);
            border: 1px solid var(--error);
        }

        .alert-success {
            background: #e6f4ea;
            color: var(--success);
            border: 1px solid var(--success);
        }

        @keyframes slideDown {
            from {
                opacity: 0;
                transform: translateY(-10px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        @media (max-width: 768px) {
            .signin-container {
                grid-template-columns: 1fr;
            }

            .signin-left {
                padding: 2rem;
            }

            .signin-left h2 {
                font-size: 1.5rem;
            }

            .signin-right {
                padding: 2rem;
            }

            .back-home {
                top: 1rem;
                left: 1rem;
            }
        }