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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #0a3a1a 0%, #0d5a2a 50%, #0f7a3a 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    overflow: hidden;
}

/* Card decoration background */
body::before {
    content: "♠ ♥ ♣ ♦";
    position: absolute;
    font-size: 120px;
    opacity: 0.05;
    top: 10%;
    left: 5%;
    animation: float 6s ease-in-out infinite;
}

body::after {
    content: "21";
    position: absolute;
    font-size: 150px;
    opacity: 0.08;
    bottom: 10%;
    right: 5%;
    animation: float 8s ease-in-out infinite reverse;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(20px);
    }
}

.container {
    position: relative;
    z-index: 10;
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

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

.logo h1 {
    color: #00FF00;
    font-size: 32px;
    text-shadow: 0 0 20px rgba(0, 255, 0, 0.6);
    margin-bottom: 5px;
    letter-spacing: 2px;
}

.logo p {
    color: #88FF88;
    font-size: 12px;
    letter-spacing: 1px;
}

.form-container {
    background: rgba(0, 100, 0, 0.2);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(0, 255, 0, 0.4);
    border-radius: 15px;
    padding: 40px;
    box-shadow: 0 8px 32px 0 rgba(0, 255, 0, 0.2);
}

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

label {
    display: block;
    color: #00FF00;
    font-size: 14px;
    margin-bottom: 8px;
    font-weight: 600;
}

input {
    width: 100%;
    padding: 12px;
    border: 1px solid rgba(0, 255, 0, 0.5);
    background: rgba(0, 100, 0, 0.1);
    color: #88FF88;
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.3s ease;
}

input::placeholder {
    color: rgba(136, 255, 136, 0.5);
}

input:focus {
    outline: none;
    border-color: #00FF00;
    background: rgba(0, 150, 0, 0.2);
    box-shadow: 0 0 10px rgba(0, 255, 0, 0.5);
}

.button-group {
    display: flex;
    gap: 10px;
    margin-top: 30px;
    align-items: center;
}

.btn {
    padding: 12px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    letter-spacing: 1px;
}

.btn-signin {
    background: linear-gradient(135deg, #00FF00, #00CC00);
    color: #000000;
    flex: 1;
}

.btn-signin:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 255, 0, 0.6);
}

/* Register button: filled theme matching sign-in but slightly darker */
.btn-register {
    background: linear-gradient(135deg, #00cc33, #009922);
    color: #000000;
    flex: 1;
}

.btn-register:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 200, 120, 0.45);
}

.btn-signup {
    background: rgba(0, 255, 0, 0.2);
    color: #00FF00;
    border: 1px solid #00FF00;
    font-size: 11px;
    padding: 8px 12px;
    min-width: 70px;
}

.btn-signup:hover {
    background: rgba(0, 255, 0, 0.3);
    box-shadow: 0 4px 15px rgba(0, 255, 0, 0.4);
}

.btn-back {
    background: rgba(0, 255, 0, 0.2);
    color: #00FF00;
    border: 1px solid #00FF00;
    font-size: 12px;
    width: 100%;
    margin-top: 15px;
}

.btn-back:hover {
    background: rgba(0, 255, 0, 0.3);
}

.card-icon {
    font-size: 48px;
    text-align: center;
    margin-bottom: 20px;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.1);
    }
}

.success-message {
    color: #00FF00;
    font-size: 12px;
    text-align: center;
    margin-top: 15px;
    display: none;
}

.success-message.show {
    display: block;
}

.error-message {
    color: #FF6B6B;
    font-size: 12px;
    text-align: center;
    margin-top: 15px;
    display: none;
}

.error-message.show {
    display: block;
}