body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #000000;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    overflow: hidden;
}

#particles-js {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 25vh;
    z-index: 0;
}

.container-custom {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 12px;
    max-width: 900px;
    width: 100%;
    overflow: hidden;
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
    border: 1px solid #e0e0e0;
}

.left {
    color: #37474f;
    flex: 1 1 55%;
    padding: 60px 80px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    z-index: 2;
    background: #e8eaf6;
    text-align: center;
    border-right: 1px solid #d1d1d6;
}

.left .header-img {
    max-width: 70%;
    height: auto;
    margin-bottom: 30px;
    filter: drop-shadow(0 3px 5px rgba(0, 0, 0, 0.08));
}

.left h1,
.left h2,
.left p {
    margin-bottom: 18px;
    text-shadow: none;
}

.left h1 {
    font-size: 30px;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    color: #263238;
}

.left h2 {
    font-size: 16px;
    opacity: 0.7;
    text-transform: uppercase;
    color: #546e7a;
}

.left p {
    font-size: 13px;
    line-height: 1.7;
    opacity: 0.7;
    max-width: 340px;
}

.right {
    background: #fff;
    flex: 1 1 45%;
    padding: 50px;
    z-index: 2;
    border-top-right-radius: 12px;
    border-bottom-right-radius: 12px;
}

.right h3 {
    font-size: 26px;
    font-weight: 600;
    margin-bottom: 20px;
    color: #263238;
    text-shadow: none;
    text-align: center;
}

.right .description {
    font-size: 13px;
    color: #546e7a;
    margin-bottom: 30px;
    text-align: center;
}

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

.form-control {
    font-size: 14px;
    background: #f9f9f9;
    border-radius: 6px;
    border: 1px solid #d1d1d6;
    padding: 12px 35px;
    color: #37474f;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-control::placeholder {
    color: #78909c;
}

.form-control:focus {
    border-color: #29b6f6;
    outline: none;
    box-shadow: 0 0 8px rgba(41, 182, 246, 0.3);
}

.input-icon {
    position: absolute;
    top: 50%;
    left: 12px;
    transform: translateY(-50%);
    color: #78909c;
    font-size: 16px;
    pointer-events: none;
}

.show-btn {
    background: none;
    border: none;
    color: #29b6f6;
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    padding: 0;
    transition: opacity 0.3s ease;
}

.show-btn:hover {
    opacity: 0.8;
}

.checkbox-row {
    font-size: 12px;
    color: #546e7a;
    margin-bottom: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.checkbox-row a {
    color: #29b6f6;
    font-weight: 500;
    text-decoration: none;
    transition: opacity 0.3s ease;
}

.checkbox-row a:hover {
    opacity: 0.8;
    text-decoration: underline;
}

.signin-btn {
    background: linear-gradient(to right, #29b6f6, #03a9f4);
    color: #fff;
    font-size: 16px;
    font-weight: 500;
    padding: 12px 0;
    border-radius: 6px;
    letter-spacing: 0.5px;
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(41, 182, 246, 0.3);
    transition: transform 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
}

.signin-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(41, 182, 246, 0.4);
}

.divider {
    display: flex;
    align-items: center;
    font-size: 12px;
    color: #78909c;
    margin: 25px 0;
}

.divider::before, .divider::after {
    content: "";
    flex: 1;
    height: 1px;
    background: #d1d1d6;
}

.divider::before {
    margin-right: 10px;
}

.divider::after {
    margin-left: 10px;
}

.btn-social-icon {
    margin: 0 8px;
    color: #fff;
    width: 40px;
    height: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 16px;
    opacity: 0.7;
    transition: opacity 0.3s ease, transform 0.2s ease-in-out;
}

.btn-social-icon:hover {
    opacity: 0.9;
    transform: scale(1.05);
}

.btn-facebook {
    background-color: #3b5998;
}

.btn-twitter {
    background-color: #1da1f2;
}

.btn-google {
    background-color: #db4437;
}

.signup-text {
    font-size: 12px;
    color: #78909c;
    margin-top: 30px;
    text-align: center;
}

.signup-text a {
    color: #29b6f6;
    font-weight: 500;
    text-decoration: none;
    transition: opacity 0.3s ease;
}

.signup-text a:hover {
    opacity: 0.8;
    text-decoration: underline;
}

.half-circle-bg {
    position: absolute;
    top: -60px;
    left: -60px;
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: rgba(41, 182, 246, 0.08);
    z-index: 0;
}

@media (max-width: 768px) {
    .container-custom {
        flex-direction: column;
    }

    .left {
        display: none;
    }

    .right {
        width: 100%;
        padding: 40px;
        text-align: center;
        border-right: none;
    }

    #particles-js {
        height: 18vh;
    }

    .right {
        border-radius: 12px;
    }

    .left .header-img {
        max-width: 60%;
        margin-bottom: 20px;
    }
}

@media (max-width: 576px) {
    body {
        padding: 15px;
    }

    #particles-js {
        height: 12vh;
    }

    .left,
    .right {
        padding: 30px;
    }

    .left h1 {
        font-size: 26px;
    }

    .left h2 {
        font-size: 14px;
    }

    .left p {
        font-size: 11px;
    }

    .right h3 {
        font-size: 22px;
    }

    .form-control {
        font-size: 13px;
        padding: 10px 30px;
    }

    .checkbox-row {
        font-size: 11px;
    }

    .signin-btn {
        font-size: 15px;
        padding: 10px 0;
    }

    .divider {
        font-size: 11px;
        margin: 20px 0;
    }

    .signup-text {
        font-size: 11px;
    }

    .btn-social-icon {
        width: 35px;
        height: 35px;
        font-size: 15px;
    }

    .half-circle-bg {
        top: -40px;
        left: -40px;
        width: 80px;
        height: 80px;
    }

    .left .header-img {
        max-width: 80%;
        margin-bottom: 15px;
    }
}