/* Base Styles */
        :root {
            --primary-color: #2563eb;
            --secondary-color: #1e40af;
            --accent-color: #3b82f6;
            --bg-color: #f8fafc;
            --text-color: #1e293b;
            --light-color: #e2e8f0;
            --dark-color: #0f172a;
            --success-color: #10b981;
            --warning-color: #f59e0b;
            --danger-color: #ef4444;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Poppins', sans-serif;
            background-color: var(--bg-color);
            color: var(--text-color);
            line-height: 1.6;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        
        /* Typography */
        h1, h2, h3 {
            font-weight: 700;
            line-height: 1.2;
            margin-bottom: 1rem;
        }
        
        h1 {
            font-size: clamp(2rem, 5vw, 3rem);
            position: relative;
            display: block;
            text-align: center;
        }
        
        h1::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 0;
            width: 100%;
            height: 4px;
            background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
            border-radius: 2px;
        }
        
        p {
            font-size: 1.1rem;
            margin-bottom: 1.5rem;
            text-align: center;
        }
        
        /* Layout */
        .container {
            width: 90%;
            max-width: 800px;
            margin: 0 auto;
            padding: 2rem 0;
            flex: 1;
        }
        
        /* Header */
        .logo {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--primary-color);
            text-decoration: none;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 2rem;
        }
        
        .logo i {
            margin-right: 0.5rem;
            color: var(--accent-color);
        }
        
        /* Registration Form */
        .registration-form {
            background-color: white;
            border-radius: 15px;
            padding: 2.5rem;
            border: 1px solid var(--light-color);
            position: relative;
        }
        
        .form-group {
            margin-bottom: 1.5rem;
        }
        
        label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 500;
        }
        
        input {
            width: 100%;
            padding: 0.8rem 1rem;
            border: 1px solid #ddd;
            border-radius: 8px;
            font-family: inherit;
            font-size: 1rem;
            transition: all 0.3s;
        }
        
        input:focus {
            outline: none;
            border-color: var(--accent-color);
            box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
        }
        
        .fee-notice {
            background-color: rgba(16, 185, 129, 0.1);
            border-left: 4px solid var(--success-color);
            padding: 1rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        
        .fee-notice p {
            margin-bottom: 0;
        }
        
        .agree-group {
            display: flex;
            align-items: center;
            margin: 2rem 0;
        }
        
        .agree-group input {
            width: auto;
            margin-right: 1rem;
        }
        
        .btn {
            display: inline-block;
            background-color: var(--primary-color);
            color: white;
            padding: 0.8rem 2rem;
            border-radius: 8px;
            text-decoration: none;
            font-weight: 600;
            transition: all 0.3s;
            border: 2px solid var(--primary-color);
            font-size: 1.1rem;
            cursor: pointer;
            width: 100%;
        }
        
        .btn:hover {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(37, 99, 235, 0.2);
        }
        
        .btn:disabled {
            background-color: #ccc;
            border-color: #ccc;
            cursor: not-allowed;
            transform: none;
            box-shadow: none;
        }
        
        .btn-success {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
        }
        
        .btn-success:hover {
            background-color: #0d9f6e;
            border-color: #0d9f6e;
            box-shadow: 0 5px 15px rgba(16, 185, 129, 0.2);
        }
        
        .lee {
            color: green;
            font-weight: 600;
        }
        
        /* Message Notification */
        .message-notification {
            position: fixed;
            top: 20px;
            left: 50%;
            transform: translateX(-50%);
            padding: 12px 24px;
            border-radius: 8px;
            font-weight: 500;
            display: flex;
            align-items: center;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
            z-index: 1000;
            opacity: 0;
            transition: opacity 0.3s, transform 0.3s;
            pointer-events: none;
        }
        
        .message-notification.show {
            opacity: 1;
            transform: translateX(-50%) translateY(0);
        }
        
        .message-notification.success {
            background-color: var(--success-color);
            color: white;
        }
        
        .message-notification.error {
            background-color: var(--danger-color);
            color: white;
        }
        
        .message-notification i {
            margin-right: 8px;
            font-size: 1.2rem;
        }
        
        /* Footer */
        footer {
            text-align: center;
            padding: 1.5rem;
            background-color: var(--dark-color);
            color: white;
            margin-top: 2rem;
        }
        
        .copyright {
            font-size: 0.9rem;
        }