/* Base Variables & Theme */
        :root {
            --primary-color: #14b18e; 
            --primary-dark: #0f8b6f;
            --dark-bg: #2c3e50; 
            --darker-bg: #1a252f;
            --text-dark: #333333;
            --text-light: #666666;
            --bg-light: #f4f7f6;
            --border-color: #e2e8f0;
        }
        body { font-family: Arial, Helvetica, sans-serif; margin: 0; padding: 0; color: var(--text-dark); line-height: 1.6; background-color: var(--bg-light); }
        a { text-decoration: none; color: var(--primary-color); transition: 0.3s; }
        a:hover { color: var(--primary-dark); }
        img { max-width: 100%; height: auto; display: block; }
        
        .container { width: 90%; max-width: 1300px; margin: 0 auto; }

        /* Buttons */
        .btn { display: inline-block; padding: 12px 28px; background-color: var(--primary-color); color: #fff; font-weight: bold; border-radius: 4px; border: 2px solid var(--primary-color); cursor: pointer; transition: 0.3s; font-size: 14px; text-transform: uppercase; letter-spacing: 0.5px; text-align: center;}
        .btn:hover { background-color: transparent; color: var(--primary-color); }
        .btn-outline { background-color: transparent; color: var(--primary-color); border-color: var(--primary-color); }
        .btn-outline:hover { background-color: var(--primary-color); color: #fff; }

        /* Header Navigation */
        .header { background: #fff; padding: 15px 0; box-shadow: 0 2px 15px rgba(0,0,0,0.06); position: sticky; top: 0; z-index: 1000; }
        .nav-container { display: flex; justify-content: space-between; align-items: center; }
        
        /* Pure CSS Logo */
        .logo { font-size: 32px; font-weight: 900; color: var(--dark-bg); letter-spacing: -1px; text-decoration: none;}
        .logo span { color: var(--primary-color); }
        
        .main-menu { display: flex; gap: 28px; align-items: center; }
        .main-menu a { color: #333; font-size: 13px; font-weight: 700; text-transform: uppercase; }
        .main-menu a:hover { color: var(--primary-color); }
        .nav-actions { display: flex; gap: 15px; align-items: center; }

        /* --- AUTHENTICATION SECTION --- */
        .auth-section { padding: 60px 0; display: flex; align-items: center; justify-content: center; min-height: calc(100vh - 350px); }
        
        .auth-card { 
            background: #fff; width: 100%; max-width: 600px; 
            border-radius: 8px; box-shadow: 0 20px 50px rgba(0,0,0,0.08); 
            overflow: hidden; border-top: 4px solid var(--primary-color);
        }
        
        .auth-header { text-align: center; padding: 40px 40px 20px 40px; }
        .auth-header h2 { margin: 0 0 10px 0; font-size: 28px; color: var(--dark-bg); }
        .auth-header p { margin: 0; font-size: 14px; color: var(--text-light); }

        /* CSS Tabs Logic */
        input[type="radio"][name="auth-tab"] { display: none; }
        
        .auth-tabs { display: flex; border-bottom: 1px solid var(--border-color); }
        .tab-label { 
            flex: 1; text-align: center; padding: 15px; font-size: 15px; font-weight: bold; 
            color: #888; cursor: pointer; transition: 0.3s; background: var(--bg-light);
        }
        .tab-label:hover { color: var(--dark-bg); }

        /* Active Tab Styling */
        #tab-login:checked ~ .auth-tabs label[for="tab-login"],
        #tab-register:checked ~ .auth-tabs label[for="tab-register"] {
            background: #fff; color: var(--primary-color); border-bottom: 3px solid var(--primary-color); margin-bottom: -1px;
        }

        /* Form Visibility Logic */
        .auth-form-container { padding: 40px; position: relative; }
        .login-form, .register-form { display: none; animation: fadeIn 0.4s ease; }
        
        #tab-login:checked ~ .auth-form-container .login-form { display: block; }
        #tab-register:checked ~ .auth-form-container .register-form { display: block; }

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

        /* Form Inputs Styling */
        .form-group { margin-bottom: 20px; }
        .form-row { display: flex; gap: 20px; margin-bottom: 20px; }
        
        .form-label { display: block; font-size: 12px; font-weight: bold; color: var(--dark-bg); margin-bottom: 8px; text-transform: uppercase; letter-spacing: 0.5px;}
        .form-control, .form-select { 
            width: 100%; padding: 14px 15px; border: 1px solid #ccc; border-radius: 4px; 
            box-sizing: border-box; font-family: inherit; font-size: 14px; color: var(--text-dark); 
            transition: 0.3s; background: #fdfdfd; 
        }
        select.form-select { cursor: pointer; }
        .form-control:focus, .form-select:focus { outline: none; border-color: var(--primary-color); box-shadow: 0 0 0 3px rgba(20, 177, 142, 0.1); background: #fff;}
        .form-control::placeholder { color: #aaa; }
        
        /* Optgroup styling for dropdowns */
        optgroup { font-weight: bold; color: var(--primary-dark); font-style: normal; }
        option { color: var(--text-dark); font-weight: normal; }

        /* Verification Code Input Wrapper */
        .verify-wrapper { display: flex; gap: 10px; }
        .verify-wrapper input { flex: 1; }
        .btn-verify { 
            background: var(--bg-light); color: var(--dark-bg); border: 1px solid #ccc; 
            padding: 0 20px; border-radius: 4px; font-weight: bold; font-size: 13px; 
            cursor: pointer; transition: 0.3s; white-space: nowrap;
        }
        .btn-verify:hover { background: var(--primary-color); color: #fff; border-color: var(--primary-color); }

        .auth-actions { margin-top: 35px; }
        .auth-actions .btn { width: 100%; box-sizing: border-box; }
        
        .forgot-pass { display: block; text-align: right; font-size: 12px; margin-top: 10px; font-weight: bold; }

		.error-message {
				color: #e74c3c;
				font-size: 15px;
				margin-top: 5px;
				min-height: 20px;
				text-align:center;
			}
			.form-control.error {
				border-color: #e74c3c;
			}
			.form-control.valid {
				border-color: #2ecc71;
			}

        /* Footer */
        footer { background: var(--darker-bg); color: #94a3b8; padding: 60px 0 20px 0; font-size: 14px; }
        .footer-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 40px; }
        .footer-col h4 { color: #fff; font-size: 16px; margin-bottom: 25px; text-transform: uppercase; position: relative; padding-bottom: 10px;}
        .footer-col h4::after { content:''; position:absolute; bottom:0; left:0; width:30px; height:2px; background:var(--primary-color); }
        .footer-col ul { list-style: none; padding: 0; margin: 0; }
        .footer-col ul li { margin-bottom: 12px; }
        .footer-col a { color: #94a3b8; }
        .footer-col a:hover { color: var(--primary-color); }
        .footer-bottom { text-align: center; border-top: 1px solid rgba(255,255,255,0.05); margin-top: 50px; padding-top: 25px; font-size: 13px;}
		
		

        /* =========================================
           H5 / Mobile Responsive Optimization
           ========================================= */
        @media (max-width: 768px) {
            .header { padding: 10px 0; }
            .nav-container { flex-direction: row; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 8px; }
            .logo { max-width: 120px; }
            .logo img { max-height: 30px; width: auto; }
            .nav-actions { gap: 10px; }
            .nav-actions span { display: none; } 
            .nav-actions a { font-size: 12px !important; }
            .nav-actions .btn { padding: 6px 12px !important; font-size: 12px !important; }
            
            .main-menu { 
                width: 100%; flex-wrap: nowrap; justify-content: flex-start; 
                overflow-x: auto; -webkit-overflow-scrolling: touch; 
                gap: 20px; padding: 12px 5px 5px 5px; 
                border-top: 1px solid var(--border-color); margin-top: 5px;
            }
            .main-menu::-webkit-scrollbar { display: none; }
            .main-menu { -ms-overflow-style: none; scrollbar-width: none; }
            .main-menu a { white-space: nowrap; font-size: 13px; }

            .auth-section { padding: 30px 0; }
            .auth-card { border-radius: 6px; }
            .auth-header { padding: 30px 20px 15px 20px; }
            .auth-header h2 { font-size: 24px; }
            .auth-form-container { padding: 25px 20px; }
            
            .form-row { flex-direction: column; gap: 0; margin-bottom: 0; }
            .form-row .form-group { flex: unset !important; width: 100%; margin-bottom: 20px; }
            
            .footer-grid { grid-template-columns: 1fr; gap: 30px; }
        }