.sub-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(10, 16, 32, 0.9);
    backdrop-filter: blur(10px);
    z-index: 10000;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1.5rem;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.sub-modal-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.sub-modal {
    background-color: var(--surface-elevated);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 2rem;
    width: 100%;
    max-width: 400px;
    text-align: center;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
    transform: scale(0.95);
    transition: transform 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.sub-modal-overlay.active .sub-modal {
    transform: scale(1);
}

.sub-icon {
    width: 100px;
    height: 100px;
    background: rgba(56, 189, 248, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    overflow: hidden;
}

.sub-icon svg {
    width: 32px;
    height: 32px;
}

.sub-icon.channel-avatar {
    background: transparent;
    border: 3px solid rgba(56, 189, 248, 0.3);
    padding: 0;
}

.sub-icon.channel-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.sub-title {
    font-size: 1.4rem;
    font-weight: 800;
    color: #fff;
    margin: 0;
}

.sub-text {
    font-size: 1rem;
    color: var(--text-muted);
    line-height: 1.5;
    margin: 0;
}

.sub-btn {
    background: var(--primary-color);
    color: #0a1020;
    border: none;
    padding: 14px 24px;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    text-decoration: none;
    width: 100%;
    transition: filter 0.2s, transform 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.sub-btn:hover {
    filter: brightness(1.1);
    transform: translateY(-2px);
}

.sub-btn.check-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    margin-top: -0.5rem;
}

.sub-btn.check-btn:hover {
    background: var(--surface-color);
}