@import url('https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:wght@400;500;700&display=swap');
        
        * {
            box-sizing: border-box;
        }

        body {
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            margin: 0;
            background: url('/images-icon/taikhoan.jpg') no-repeat center center;
            background-size: cover;
            font-family: 'Be Vietnam Pro', sans-serif;
        }

        .container {
            background: rgba(0, 0, 0, 0.75);
            backdrop-filter: blur(12px);
            border-radius: 20px;
            box-shadow: 0 0 30px rgba(0, 0, 0, 0.5);
            position: relative;
            overflow: hidden;
            width: 800px;
            max-width: 95%;
            min-height: 560px;/* Tăng chiều cao để vừa form đăng ký */
        }

        .form-container {
            position: absolute;
            top: 0;
            height: 100%;
            transition: all 0.6s ease-in-out;
            width: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        form {
            background: transparent;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-direction: column;
            padding: 0 40px;
            height: 100%;
            width: 100%;
            text-align: center;
            color: #fff;
        }
        
        h1 { font-weight: 700; margin-bottom: 1rem; color: #fff; }
        .input-group { background: rgba(255, 255, 255, 0.1); border-radius: 8px; width: 100%; margin: 6px 0; display: flex; align-items: center; padding: 0 15px; }
        .input-group i { color: #ccc; margin-right: 10px; }
        input { width: 100%; padding: 14px 10px; background: transparent; border: none; outline: none; color: #fff; font-family: 'Be Vietnam Pro', sans-serif; font-size: 14px; }
        input::placeholder { color: #ccc; }
        input[type="date"] { color-scheme: dark; }

        button { border-radius: 8px; border: 1px solid #00ffff; background: #00ffff; color: #000; font-size: 12px; font-weight: bold; padding: 12px 45px; letter-spacing: 1px; text-transform: uppercase; transition: transform 80ms ease-in, background-color 0.3s ease, color 0.3s ease; cursor: pointer; margin-top: 1rem; }
        button:hover { background: transparent; color: #00ffff; }
        button:active { transform: scale(0.95); }
        button.ghost { background: transparent; border-color: #fff; color: #fff; }
        button.ghost:hover { background: rgba(255, 255, 255, 0.1); }
        .forgot-password { color: #ccc; font-size: 14px; text-decoration: none; margin: 15px 0; }

  /* === PHẦN CSS SỬA LỖI HIỆU ỨNG === */
        .sign-in-container {
            left: 0;
            z-index: 2;
        }
        .sign-up-container {
            left: 0;
            z-index: 1;
            opacity: 0;
        }
        .overlay-container {
            position: absolute;
            top: 0;
            left: 50%;
            width: 50%;
            height: 100%;
            overflow: hidden;
            transition: transform 0.6s ease-in-out;
            z-index: 100;
        }
        .overlay {
            background: linear-gradient(to right, #00c6ff, #0072ff);
            color: #fff;
            position: relative;
            left: -100%;
            height: 100%;
            width: 200%;
            transform: translateX(0);
            transition: transform 0.6s ease-in-out;
        }
        .overlay-panel {
            position: absolute;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-direction: column;
            padding: 0 40px;
            text-align: center;
            top: 0;
            height: 100%;
            width: 50%;
            transition: transform 0.6s ease-in-out;
        }
        .overlay-panel p { font-size: 14px; line-height: 20px; margin: 20px 0 30px; }
        .overlay-left { transform: translateX(-20%); margin-left: 10%; }
        .overlay-right { right: 0; transform: translateX(0); }
        
   /* HIỆU ỨNG KHI BẤM NÚT */
        .container.right-panel-active .overlay-container {
            transform: translateX(-100%);
        }
        .container.right-panel-active .overlay {
            transform: translateX(50%);
        }
        .container.right-panel-active .sign-in-container {
            transform: translateX(100%);
            opacity: 0;
            z-index: 1;
        }
        .container.right-panel-active .sign-up-container {
            transform: translateX(100%);
            opacity: 1;
            z-index: 5;
            animation: show 0.6s;
        }
        @keyframes show {
            0%, 49.99% { opacity: 0; z-index: 1; }
            50%, 100% { opacity: 1; z-index: 5; }
        }