.register-form {
    width: min(420px, calc(100vw - 40px));
    padding: clamp(30px, 5vw, 50px);
    color: var(--color-text);
    text-align: center;
    background: var(--color-surface);
    border: 0;
    border-radius: var(--radius-large);
    box-shadow:
        12px 12px 24px var(--shadow),
        -10px -10px 22px var(--highlight);
}

.register-form h1 {
    margin: 0 0 20px;
    color: var(--color-primary);
    font-size: clamp(1.8rem, 6vw, 2.2rem);
    font-weight: 700;
}

.register-form input {
    width: 90%;
    padding: 12px 14px;
    margin: 8px 0;
    color: var(--color-text);
    font-size: 1rem;
    background: var(--color-input);
    border: 0;
    border-radius: var(--radius-small);
    outline: none;
    box-shadow:
        inset 4px 4px 8px var(--shadow),
        inset -4px -4px 8px var(--highlight);
    transition:
        box-shadow var(--transition-fast),
        outline-color var(--transition-fast);
}

.register-form input:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 1px;
}

.register-form input::placeholder {
    color: var(--color-text-muted);
}

.register-form button {
    width: 100%;
    padding: 12px;
    color: var(--color-text-inverse);
    font-weight: 700;
    cursor: pointer;
    background: var(--color-primary);
    border: 0;
    border-radius: var(--radius-small);
    box-shadow:
        5px 5px 10px var(--shadow),
        -4px -4px 9px var(--highlight);
    transition:
        transform var(--transition-fast),
        background var(--transition-fast),
        box-shadow var(--transition-fast);
}

.register-form button:hover {
    background: var(--color-primary-hover);
    transform: translateY(-2px);
}

.register-form button:active {
    transform: translateY(0) scale(0.97);
    box-shadow:
        inset 4px 4px 8px var(--shadow),
        inset -4px -4px 8px var(--highlight);
}

.register-form p {
    margin: 0 0 10px;
    color: var(--color-admin);
    font-size: 0.9rem;
}

.register-form h3 {
    margin: 0;
    color: var(--color-text-muted);
    font-size: 15px;
    font-weight: 400;
}

@media (max-width: 600px) {
    .register-form {
        width: min(420px, calc(100vw - 30px));
        padding: 35px 25px;
    }

    .register-form input {
        width: 95%;
    }
}

@media (max-width: 400px) {
    .register-form {
        width: calc(100vw - 24px);
        padding: 30px 20px;
    }

    .register-form input {
        width: 100%;
    }
}