.invalid-page {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 80px 24px 100px 24px;
    min-height: calc(100vh - 80px);
    box-sizing: border-box;
}

.invalid-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 18px;
    width: 100%;
    max-width: 560px;
    padding: 48px 36px;
    background-color: #14151c;
    border: 1px solid #2a2c36;
    border-radius: 16px;
    text-align: center;
    font-family: 'Inter Tight', sans-serif;
}

.invalid-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 88px;
    height: 88px;
    border-radius: 50%;
    background-color: #fee2e2;
    margin-bottom: 8px;
}

.invalid-icon img {
    width: 48px;
    height: 48px;
    color: #dc2626;
    filter: invert(22%) sepia(88%) saturate(2877%) hue-rotate(354deg) brightness(91%) contrast(96%);
}

.invalid-title {
    font-size: 32px;
    line-height: 1.2;
    font-weight: 800;
    color: #ffffff;
    margin: 0;
}

.invalid-subtitle {
    font-size: 18px;
    line-height: 1.5;
    color: #c5c8d3;
    margin: 0;
}

.invalid-instructions {
    display: flex;
    flex-direction: column;
    gap: 12px;
    width: 100%;
    margin-top: 16px;
    padding: 20px 22px;
    border-radius: 10px;
    background-color: #1a1c25;
    border: 1px solid #2a2c36;
    text-align: left;
}

.invalid-instructions p {
    font-size: 14px;
    line-height: 1.5;
    color: #c5c8d3;
    margin: 0;
}

.invalid-back-button {
    display: inline-block;
    margin-top: 8px;
    padding: 12px 28px;
    background-color: #6c63ff;
    color: #ffffff;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 15px;
    transition: background-color 0.15s;
}

.invalid-back-button:hover {
    background-color: #5a52e6;
}

@media (max-width: 640px) {
    .invalid-page {
        padding: 32px 16px 80px 16px;
    }

    .invalid-card {
        padding: 32px 22px;
    }

    .invalid-title {
        font-size: 26px;
    }

    .invalid-subtitle {
        font-size: 16px;
    }
}