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

body {
    font-family: Arial, sans-serif;
    background:
        linear-gradient(rgba(3, 10, 19, 0.90), rgba(3, 10, 19, 0.94)),
        url("images/gold.jpg");
    background-size: cover;
    background-position: center;
    min-height: 100vh;
    color: white;
}

.register-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
}

.register-card {
    width: 100%;
    max-width: 720px;

    background: rgba(10, 22, 38, 0.94);
    border: 1px solid #2a3b52;
    border-radius: 18px;

    padding: 42px;

    box-shadow: 0 20px 55px rgba(0, 0, 0, 0.38);
    backdrop-filter: blur(8px);
}

.register-logo {
    display: block;
    text-align: center;

    color: white;
    text-decoration: none;

    font-size: 29px;
    font-weight: 800;

    margin-bottom: 24px;
}

.register-logo span {
    color: #d4a72c;
}

.register-heading {
    text-align: center;
    margin-bottom: 32px;
}

.register-heading h1 {
    font-size: 34px;
    margin-bottom: 10px;
}

.register-heading p {
    max-width: 560px;
    margin: auto;

    color: #9aa8ba;
    line-height: 1.6;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;

    color: #cbd5e1;
    font-size: 14px;
    font-weight: 600;
}

.optional {
    color: #7d8a9d;
    font-size: 12px;
    font-weight: normal;
}

.form-group input,
.form-group select {
    width: 100%;
    min-height: 50px;

    background: #0c1726;
    color: white;

    border: 1px solid #34465d;
    border-radius: 9px;

    padding: 0 15px;

    font-size: 15px;
    outline: none;

    transition: 0.25s ease;
}

.form-group input::placeholder {
    color: #6f7e91;
}

.form-group input:focus,
.form-group select:focus {
    border-color: #d4a72c;
    box-shadow: 0 0 0 3px rgba(212, 167, 44, 0.12);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
}

.phone-field {
    display: grid;
    grid-template-columns: 135px 1fr;
    gap: 10px;
}

.phone-field select {
    cursor: pointer;
}

.referral-field {
    display: grid;
    grid-template-columns: 1fr 50px;
    gap: 10px;
    align-items: center;
}

.referral-status {
    width: 50px;
    height: 50px;

    display: flex;
    align-items: center;
    justify-content: center;

    border-radius: 9px;
    border: 1px solid #34465d;

    background: #0c1726;

    font-size: 24px;
    font-weight: bold;

    transition: 0.25s ease;
}

.referral-status.valid {
    background: rgba(34, 197, 94, 0.12);
    border-color: #22c55e;
    color: #22c55e;
}

.referral-status.invalid {
    background: rgba(239, 68, 68, 0.12);
    border-color: #ef4444;
    color: #ef4444;
}

.referral-message {
    min-height: 18px;
    margin-top: 8px;

    font-size: 13px;
}

.referral-message.valid {
    color: #4ade80;
}

.referral-message.invalid {
    color: #f87171;
}

.terms {
    display: flex;
    align-items: flex-start;
    gap: 10px;

    color: #aeb8c7;

    font-size: 13px;
    line-height: 1.6;

    margin: 6px 0 24px;
}

.terms input {
    margin-top: 4px;
    accent-color: #d4a72c;
}

.terms a {
    color: #d4a72c;
    text-decoration: none;
}

.terms a:hover {
    text-decoration: underline;
}

.register-submit {
    width: 100%;
    min-height: 52px;

    border: none;
    border-radius: 9px;

    background: #d4a72c;
    color: #07111f;

    font-size: 16px;
    font-weight: 800;

    cursor: pointer;
    transition: 0.25s ease;
}

.register-submit:hover {
    transform: translateY(-2px);
    background: #e3b341;
}

.login-link {
    display: flex;
    justify-content: center;
    gap: 7px;
    flex-wrap: wrap;

    margin-top: 24px;

    color: #9aa8ba;
    font-size: 14px;
}

.login-link a {
    color: #d4a72c;
    font-weight: 700;
    text-decoration: none;
}

.login-link a:hover {
    text-decoration: underline;
}

.back-home {
    display: block;

    margin-top: 22px;

    text-align: center;

    color: #9aa8ba;
    text-decoration: none;

    font-size: 14px;
}

.back-home:hover {
    color: white;
}


/* TABLET */

@media (max-width: 700px) {

    .register-card {
        max-width: 560px;
        padding: 34px 28px;
    }

    .form-row {
        grid-template-columns: 1fr;
        gap: 0;
    }

}


/* MOBILE */

@media (max-width: 550px) {

    .register-page {
        padding: 20px 14px;
        align-items: flex-start;
    }

    .register-card {
        margin-top: 10px;

        padding: 30px 20px;

        border-radius: 14px;
    }

    .register-logo {
        font-size: 25px;
    }

    .register-heading h1 {
        font-size: 28px;
    }

    .register-heading p {
        font-size: 14px;
    }

    .phone-field {
        grid-template-columns: 115px 1fr;
    }

    .referral-field {
        grid-template-columns: 1fr 48px;
    }

    .referral-status {
        width: 48px;
        height: 50px;
    }

}


/* SMALL MOBILE */

@media (max-width: 380px) {

    .register-card {
        padding: 26px 16px;
    }

    .phone-field {
        grid-template-columns: 1fr;
    }

    .phone-field select {
        min-height: 46px;
    }

    .referral-field {
        grid-template-columns: 1fr 46px;
    }

    .referral-status {
        width: 46px;
    }

}